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Artykuły w czasopismach na temat „MSSM parameter”

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Data publikacji: 6 września 2023

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1

SOPCZAK, ANDRÉ. "A General MSSM Parameter Scan". International Journal of Modern Physics A 16, supp01b (wrzesień 2001): 816–18. http://dx.doi.org/10.1142/s0217751x01008187.

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The excluded tan β range and Higgs boson mass region in the framework of the Minimal Supersymmetric extension of the Standard Model (MSSM) depend on several parameters. The Higgs boson masses, cross-sections and branching fractions have been determined including two-loop diagrammatic calculations. The limit obtained with a more general scan over the parameter space of the MSSM are compared with those in the so-called benchmark scenario. The combination of the searches for Higgs particles in the 1999 data collected by the DELPHI collaboration at center-of-mass energies between 191.6 and 201.7 GeV allows stringent limits to be set in combination with previous DELPHI results. In addition, an interpretation in the framework of the general MSSM scan of the 2000 LEP data at the hightest energies between 201.7 and 209.0 GeV is given. We show that the current data for the HZ and hA production can be comfortably accommodated in the MSSM.

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KAWAMURA, YOSHIHARU, TATSUO KOBAYASHI i MANABU WATANABE. "BOTTOM-UP APPROACH TO B-PARAMETER IN MINIMAL SUPERSYMMETRIC STANDARD MODEL". International Journal of Modern Physics A 15, nr 01 (10.01.2000): 81–103. http://dx.doi.org/10.1142/s0217751x00000057.

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We study μ and B-parameters in the minimal supersymmetric standard model (MSSM) based on the radiative electroweak symmetry breaking scenario using "bottom-up" approach and show how useful our approach is to select a phenomenologically viable model beyond the MSSM under the assumption that the underlying theory is a string model or a gauge-Yukawa unified gauge model.

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3

ARHRIB, ABDESSLAM, RACHID BENBRIK, MOHAMED CHABAB, WEI TING CHANG i TZU-CHIANG YUAN. "CP violation in Charged Higgs Bosons decays H± → W± (γ, Z) in the Minimal Supersymmetric Standard Model (MSSM)". International Journal of Modern Physics A 22, nr 31 (20.12.2007): 6022–32. http://dx.doi.org/10.1142/s0217751x07039201.

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One loop mediated charged Higgs bosons decays H± → W±V, V = Z, γ are studied in the Minimal Supersymmetric Standard Model (MSSM) with and without CP violating phases. We evaluate the MSSM contributions to these processes taking into account B → Xsγ constraint as well as experimental constraints on the MSSM parameters. In the MSSM, we found that in the intermediate range of tan β ≲ 10 and for large At and large μ, where the lightest top squark becomes very light and hence non-decoupled, the branching ratio of H± → W±Z can be of the order 10−3 while the branching ratio of H± → W±γ is of the order 10−5. We found also that the CP violating phases of soft SUSY parameters can modify the branching ratio by about one order of magnitude. We also show that MSSM with CP violating phases lead to CP-violating asymmetry in the decays H+ → W+V and H− → W−V. Such CP asymmetry can be rather large and can reach 80% in some region of parameter space.

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4

PARRY, J. K. "$B_s\mbox{--}\bar{B}_s$ MIXING IN THE MSSM WITH LARGE tan β". Modern Physics Letters A 21, nr 38 (14.12.2006): 2853–60. http://dx.doi.org/10.1142/s0217732306022250.

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The [Formula: see text] mixing parameter ΔMs is studied in the MSSM with large tan β. The recent Tevatron measurement of ΔMs is used to constrain the MSSM parameter space. From this analysis the often neglected contribution to ΔMs from the operator [Formula: see text] is found to be significant.

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5

Heng, Zhaoxia. "A 125 GeV Higgs and Its Diphoton Signal in Different SUSY Models: A Mini Review". Advances in High Energy Physics 2012 (2012): 1–17. http://dx.doi.org/10.1155/2012/312719.

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In this paper we briefly review our recent studies on a 125 GeV Higgs and its diphoton signal rate in different low-energy supersymmetric models, namely, the minimal supersymmetric standard model (MSSM), the next-to-minimal supersymmetric standard model (NMSSM), the nearly minimal supersymmetric standard model (nMSSM), and the constrained MSSM. Our conclusion is as follows (i) in the allowed parameter space the SM-like Higgs boson can easily be 125 GeV in the MSSM, NMSSM, and nMSSM, while it is hard to realize in the constrained MSSM; (ii) the diphoton Higgs signal rate in the nMSSM and constrained MSSM is suppressed relative to the prediction of the SM, while the signal rate can be enhanced in the MSSM and NMSSM; (iii) the NMSSM may allow for a lighter top squark than the MSSM, which can thus ameliorate the fine-tuning problem.

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6

Khosa, Charanjit K., i P. N. Pandita. "Measuring the trilinear neutral Higgs boson couplings in the minimal supersymmetric standard model at e+e− colliders in the light of the discovery of a Higgs boson". International Journal of Modern Physics A 31, nr 18 (29.06.2016): 1650108. http://dx.doi.org/10.1142/s0217751x16501086.

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We consider the measurement of the trilinear couplings of the neutral Higgs bosons in the minimal supersymmetric standard model (MSSM) at a high energy [Formula: see text] linear collider in the light of the discovery of a Higgs boson at the CERN Large Hadron Collider (LHC). We identify the state observed at the LHC with the lightest Higgs boson [Formula: see text] of the MSSM, and impose the constraints following from this identification, as well as other experimental constraints on the MSSM parameter space. In order to measure trilinear neutral Higgs couplings, we consider different processes where the heavier Higgs boson [Formula: see text] of the MSSM is produced in electron–positron collisions, which subsequently decays into a pair of lighter Higgs boson. We identify the regions of the MSSM parameter space where it may be possible to measure the trilinear couplings of the Higgs boson at a future electron–positron collider. A measurement of the trilinear Higgs couplings is a crucial step in the construction of the Higgs potential, and hence in establishing the phenomena of spontaneous symmetry breaking in gauge theories.

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7

Wu, Shuang, Aik Hui Chan i Choo Hiap Oh. "Analysis of the Unknown node msubsup found in MathML fragment. $ B_s^0 $ → µ+µ– decay in the MSSM". EPJ Web of Conferences 206 (2019): 09001. http://dx.doi.org/10.1051/epjconf/201920609001.

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The first observation of the $ B_s^0 $ → µ+µ– decay mode was reported by the CMS and LHCb collaboration. The small branching ratio inherent to this decay mode makes it highly sensitive for probing physics beyond the SM and we analyze this decay in the framework of the Minimal Supersymmetric Standard Model (MSSM). Complete analytical expressions for the decay amplitude at the one-loop order have been obtained with the aid of computational tools such as FeynArts and FeynCalc. The general recipe for utilising these computational tools to aid theoretical calculations in the MSSM is discussed. Working in the phenomenological MSSM with reduced parameter space, a simplification of the complete analytical expression was done to express the $ B_s^0 $ → µ+µ– branching ratio as a function of these parameters. Numerical studies of the parametric dependence of $ B_s^0 $ → µ+µ– branching ratio in the phenomenological MSSM can be easily performed with the obtained analytical expression.

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8

Abdallah, W., i S. Khalil. "MSSM Dark Matter in Light of Higgs and LUX Results". Advances in High Energy Physics 2016 (2016): 1–10. http://dx.doi.org/10.1155/2016/5687463.

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The constraints imposed on the Minimal Supersymmetric Standard Model (MSSM) parameter space by the Large Hadron Collider (LHC) Higgs mass limit and gluino mass lower bound are revisited. We also analyze the thermal relic abundance of lightest neutralino, which is the Lightest Supersymmetric Particle (LSP). We show that the combined LHC and relic abundance constraints rule out most of the MSSM parameter space except a very narrow region with very largetan⁡β (~50). Within this region, we emphasize that the spin-independent scattering cross section of the LSP with a proton is less than the latest Large Underground Xenon (LUX) limit by at least two orders of magnitude. Finally, we argue that nonthermal Dark Matter (DM) scenario may relax the constraints imposed on the MSSM parameter space. Namely, the following regions are obtained:m0≃O(4) TeV andm1/2≃600 GeV for lowtan⁡β (~10);m0~m1/2≃O(1) TeV orm0≃O(4) TeV andm1/2≃700 GeV for largetan⁡β (~50).

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9

Ellis, John, Keith A. Olive i Yudi Santoso. "The MSSM parameter space with non-universal Higgs masses". Physics Letters B 539, nr 1-2 (lipiec 2002): 107–18. http://dx.doi.org/10.1016/s0370-2693(02)02071-3.

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10

Wang, Wenyu. "A Comparative Study of Dark Matter in the MSSM and Its Singlet Extensions: A Mini Review". Advances in High Energy Physics 2012 (2012): 1–22. http://dx.doi.org/10.1155/2012/216941.

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In this note we briefly review the recent studies of dark matter in the MSSM and its singlet extensions: the NMSSM, the nMSSM, and the general singlet extension. Under the new detection results of CDMS II, XENON, CoGeNT, and PAMELA, we find that (i) the latest detection results can exclude a large part of the parameter space which is allowed by current collider constraints in these models. The future SuperCDMS and XENON can cover most of the allowed parameter space; (ii) the singlet sector will decouple from the MSSM-like sector in the NMSSM; however, singlet sector makes the nMSSM quite different from the MSSM; (iii) the NMSSM can allow light dark matter at several GeV to exist. Light CP-even or CP-odd Higgs boson must be present so as to satisfy the measured dark matter relic density. In case of the presence of a light CP-even Higgs boson, the light neutralino dark matter can explain the CoGeNT and DAMA/LIBRA results; (iv) the general singlet extension of the MSSM gives a perfect explanation for both the relic density and the PAMELA result through the Sommerfeld-enhanced annihilation. Higgs decays in different scenario are also studied.

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11

RICHTER-WAS, ELŻBIETA, DANIEL FROIDEVAUX, FABIOLA GIANOTTI, LUC POGGIOLI, DONATELLA CAVALLI i SILVIA RESCONI. "MINIMAL SUPERSYMMETRIC STANDARD MODEL HIGGS RATES AND BACKGROUNDS IN ATLAS". International Journal of Modern Physics A 13, nr 09 (10.04.1998): 1371–494. http://dx.doi.org/10.1142/s0217751x98000640.

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This study presents an overview of the potential of the ATLAS detector at LHC for the observation of the Higgs boson of the minimal supersymmetric Standard Model (MSSM). The expected rates, backgrounds and significances are discussed channel by channel using realistic assumptions for the detector performance. As final results, the ranges of the MSSM parameter space projected on the (mA, tan β) and (mh, tan β) planes, for which the expected significances for the discovery of the different channels exceed a 5σ value, are shown for the ATLAS detector alone and for combined results from the ATLAS and CMS detectors. It is concluded that the combined potential of the two LHC detectors should fully cover the Higgs sector of the MSSM parameter space. The sensitivity of the results to the upper limit of the allowed mass for the lightest Higgs boson is extensively discussed. The direct impact of the SUSY particle sector on such searches is neglected in this paper.

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12

ARGYROU, M., A. KATSIKATSOU i I. MALAMOS. "REFINEMENTS IN EFFECTIVE POTENTIAL CALCULATIONS IN THE MSSM". Modern Physics Letters A 21, nr 40 (28.12.2006): 3009–20. http://dx.doi.org/10.1142/s0217732306022353.

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The one-loop effective potential is a powerful tool in studying the electroweak symmetry breaking of supersymmetric theories, whose precise calculation may have important phenomenological consequences. In this work, we are correctly treating the contribution of the Higgs sector to the effective potential and refine the radiative corrections to the Higgs mixing parameter μ, which is known to affect greatly the supersymmetric spectrum. Working at the average stop scale to minimize the effect of the stop sector, we find additional corrections which can play a dominant role in the focus point region of the parameter space of the MSSM. The comparison of our results with those of the literature is discussed. We also discuss the gauge dependence of the effective potential and its effect on the μ parameter in analyses where this is determined from the one-loop minimization conditions of the effective potential.

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13

YANG, JIN MIN. "SUSY DARK MATTER IN LIGHT OF CDMS/XENON LIMITS". International Journal of Modern Physics D 20, nr 08 (15.08.2011): 1383–88. http://dx.doi.org/10.1142/s0218271811019566.

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We briefly review the current CDMS/XENON constraints on the neutralino dark matter in three popular supersymmetric models: the minimal (MSSM), the next-to-minimal (NMSSM) and the nearly minimal (nMSSM). The constraints from the dark matter relic density and various collider experiments are also taken into account. The conclusion is that for each model the current CDMS/XENON limits can readily exclude a large part of the parameter space allowed by other constraints and the future SuperCDMS or XENON100 can cover most of the allowed parameter space. The implication for the Higgs search at the LHC is also discussed. It is found that in the currently allowed parameter space the MSSM charged Higgs boson is quite unlikely to be discovered at the LHC while the neutral Higgs bosons H and A may be accessible at the LHC in the parameter space with a large μ parameter.

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14

BEDNYAKOV, A. V. "ON THE TWO-LOOP DECOUPLING CORRECTIONS TO τ-LEPTON AND b-QUARK RUNNING MASSES IN THE MSSM". International Journal of Modern Physics A 25, nr 12 (10.05.2010): 2437–56. http://dx.doi.org/10.1142/s0217751x10048494.

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Masses of heavy Standard Model (SM) fermions (top-quark, bottom-quark and tau-lepton) play an important role in the analysis of theories beyond the SM. They serve as low-energy input and reduce the parameter space of such theories. In this paper Minimal supersymmetric extension of the SM is considered and two-loop relations between known SM values of fermion masses and running parameters of the MSSM are studied within the effective theory approach. Both b-quark and τ-lepton have the same quantum numbers with respect to SU(2) group and in the MSSM acquire their masses due to interactions with the same Higgs doublet. As a consequence, for large values of tan β parameter corresponding Yukawa couplings also become large and together with tan β can significantly enhance radiative corrections. In the case of b-quark two-loop [Formula: see text] contribution to the relation between running bottom-quark mass in QCD and MSSM is known in literature. This paper is devoted to calculation of the NNLO corrections proportional to Yukawa couplings. For the τ-lepton obtained contribution can be considered as a good approximation to the full two-loop result. For the b-quark numerical analysis given in the paper shows that only the sum of strong and Yukawa corrections can play such a role.

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15

Ding, Ran, Li Huang, Tianjun Li i Bin Zhu. "Interpreting 750 GeV diphoton excess with R-parity violating supersymmetry". International Journal of Modern Physics A 32, nr 02n03 (25.01.2017): 1750014. http://dx.doi.org/10.1142/s0217751x17500142.

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We propose a supersymmetric explanation of the diphoton excess in the Minimal Supersymmetric Standard Model (MSSM) with the leptonic R-parity violation. In our model, sneutrino serves as the 750 GeV resonance and produced through quark–antiquark annihilation. With introducing appropriate trilinear soft parameters, we show that the diphoton branching ratio is significantly enhanced compared with the conventional MSSM. For current dijet and W-pair LHC constraints, we can successfully fit the observed diphoton signal rate in sizeable parameter regions, the resulting parameter space strongly favor the masses of light smuon and stau within the range from 375–500 GeV, which depends on the choice of electroweakino masses and soft trilinear terms. While after taking into account the compatibility of diphoton excess between the 8 TeV and 13 TeV LHC, only the coupling involved with the second generation quarks is survived. In this case, the corresponding parameter space favors a narrow mass range of smuon and stau with [Formula: see text]. Even if the 750 GeV diphoton excesses were not confirmed by the ATLAS and CMS experiments, we point out that our proposal can still be used to explain the current and future tentative diphoton excesses.

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16

ALLAHVERDI, ROUZBEH. "INFLATION AND THE MINIMAL SUPERSYMMETRIC STANDARD MODEL". Modern Physics Letters A 23, nr 33 (30.10.2008): 2799–809. http://dx.doi.org/10.1142/s0217732308028557.

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There is strong evidence from cosmological data that the universe underwent an epoch of superluminal expansion called inflation. A satisfactory embedding of inflation in fundamental physics has been an outstanding problem at the interface of cosmology and high energy physics. We show how inflation can be realized within the Minimal Supersymmetric Standard Model (MSSM). The inflaton candidates are two specific combinations of supersymmetric partners of quarks and leptons. MSSM inflation occurs at a low scale and generates perturbations in the range experimentally allowed by the latest data from Wilkinson Microwave Anisotropy Probe (WMAP). The parameter space for inflation is compatible with supersymmetric dark matter, and the Large Hadron Collider (LHC) is capable of discovering the inflaton candidates in the allowed regions of parameter space.

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17

Ovrut, Burt A., Austin Purves i Sogee Spinner. "A statistical analysis of the minimal SUSY B–L theory". Modern Physics Letters A 30, nr 18 (25.05.2015): 1550085. http://dx.doi.org/10.1142/s0217732315500856.

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The structure of the B–L minimal supersymmetric Standard Model (MSSM) theory — specifically, the relevant mass scales and soft supersymmetric breaking parameters — is discussed. The space of initial soft parameters is explored at the high scale using random statistical sampling subject to a constraint on the range of dimensionful parameters. For every chosen initial point, the complete set of renormalization group equations is solved. The low energy results are then constrained to be consistent with present experimental data. It is shown that a large set of initial conditions satisfy these constraints and lead to acceptable low energy particle physics. Each such initial point has explicit predictions, such as the exact physical sparticle spectrum which is presented for two such points. There are also statistical predictions for the masses of the sparticles and the LSP species which are displayed as histograms. Finally, the fine-tuning of the μ parameter — which is always equivalent to or smaller than in the MSSM — is discussed.

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18

Chi-Yi, Chen, i Hou Hong-Sheng. "Production at linear colliders of charginos and neutrilinos associated with Higgs and gauge bosons". Canadian Journal of Physics 93, nr 3 (marzec 2015): 278–82. http://dx.doi.org/10.1139/cjp-2014-0160.

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We studied the production of charginos and neutrilinos associated with Higgs and gauge bosons in the Minimal Supersymmetric Standard Model (MSSM) at linear colliders. Understanding the processes will help determine the couplings of charginos and neutralinos to Higgs and gauge bosons in the MSSM. We investigated the parameter space for values of μ between –2000 and 2000 GeV and values of M2 between 0 and 2000 GeV. We found that the cross sections of the processes reach only a few femtobarns at a e+e– colliders with [Formula: see text] GeV.

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19

YEGHIYAN, G. K., M. JURČIŠIN i D. I. KAZAKOV. "INFRARED QUASI-FIXED POINTS AND MASS PREDICTIONS IN THE MSSM". Modern Physics Letters A 14, nr 08n09 (21.03.1999): 601–19. http://dx.doi.org/10.1142/s0217732399000663.

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We consider the infrared quasi-fixed point solutions of the renormalization group equations for the top-quark Yukawa coupling and soft supersymmetry breaking parameters in the MSSM. The ir quasi-fixed points together with the values of the gauge couplings, the top-quark and Z-boson masses allow one to predict masses of the Higgs bosons, the stop squarks and the lightest chargino as functions of the only free parameter m1/2 or the gluino mass. The mass of the lightest Higgs boson for μ>0 and M SUSY ≈ 1 TeV is found to be mh = (94.3+1.6+0.6±5±0.4) GeV. The case with μ<0 is excluded by experimental data.

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20

Huang, Guo-Yuan, Zhi-Zhong Xing i Jing-Yu Zhu. "Spontaneous μ-τ Reflection Symmetry Breaking in Neutrino Phenomenology". Universe 4, nr 12 (4.12.2018): 141. http://dx.doi.org/10.3390/universe4120141.

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The latest global analysis of neutrino oscillation data indicates that the normal neutrino mass ordering is favored over the inverted one at the 3 σ level. The best-fit values of the largest neutrino mixing angle θ 23 and the Dirac CP-violating phase δ are located in the higher octant and the third quadrant, respectively. We show that these experimental trends can be naturally explained by the μ - τ reflection symmetry breaking, triggered by the one-loop renormalization-group equations (RGEs) running from a superhigh energy scale down to the electroweak scale in the framework of the minimal supersymmetric standard model (MSSM). The complete parameter space is numerically explored for both the Majorana and Dirac cases, by allowing the smallest neutrino mass m 1 and the MSSM parameter tan β to vary within their reasonable ranges.

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21

Ahmed, Ijaz. "Sources of Charged Higgs Pair through Double or Triple Higgs Production at Linear Colliders". Advances in High Energy Physics 2017 (2017): 1–7. http://dx.doi.org/10.1155/2017/6139250.

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The production of triple Higgs (H+H-H0), (H+H-h0) and pairwise charged Higgs boson (H+H-) is studied in the context of future linear colliders within the two-Higgs-doublet model (2HDM) type II. The aim is to compare sources of charged Higgs pair through the above processes, that is, double and triple Higgs production. Cross sections are calculated at the leading order in 2HDM type II and Minimal Supersymmetric Standard Model (MSSM). Several orders of magnitude (~104) enhancement are observed in 2HDM compared to MSSM, while no sizable enhancement is seen in muon collider versus electron-positron collider. The analysis is based on a heavy charged Higgs with mass above 500 GeV. It is found that double charged Higgs production cross section (being the same in 2HDM and MSSM) is few femtobarns, while the triple Higgs production cannot exceed a fraction of femtobarn within the parameter space under study.

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22

Yu, Yao, i Sibo Zheng. "Oblique Corrections in the MSSM at One-Loop—Part I: Scalars". Advances in High Energy Physics 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/539747.

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This paper is devoted to reconsider the one-loop oblique corrections arising from the scalar superpartners in the MSSM, that is, the squarks, the sleptons, and the scalars in Higgs sector. We explicitly present the complete one-loop forms of self-energy corrections to the gauge bosons of SM electroweak gauge groups, as well as their descendants theS,T, andUparameters, which can be directly applied to constrain the parameter space of the MSSM. Our results about one-loop self energies are found to agree with Drees et al. (1992) and Pierce et al. (1997). Nevertheless, theS,T, andUparameters are not in agreement with Dobado et al. (1999).

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Zhao, Jun. "The Higgs properties in the MSSM after the LHC Run-2". International Journal of Modern Physics A 33, nr 11 (20.04.2018): 1841001. http://dx.doi.org/10.1142/s0217751x18410014.

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We scrutinize the parameter space of the SM-like Higgs boson in the minimal supersymmetric standard model (MSSM) under current experimental constraints. The constraints are from (i) the precision electroweak data and various flavor observables; (ii) the direct 22 separate ATLAS searches in Run-1; (iii) the latest LHC Run-2 Higgs data and tri-lepton search of electroweakinos. We perform a scan over the parameter space and find that the Run-2 data can further exclude a part of parameter space. For the property of the SM-like Higgs boson, its gauge couplings further approach to the SM values with a deviation below 0.1%, while its Yukawa couplings [Formula: see text] and [Formula: see text] can still sizably differ from the SM predictions by several tens percent.

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24

CSÁKI, CSABA. "THE MINIMAL SUPERSYMMETRIC STANDARD MODEL". Modern Physics Letters A 11, nr 08 (14.03.1996): 599–613. http://dx.doi.org/10.1142/s021773239600062x.

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The structure of the MSSM is reviewed. We first motivate the particle content of the theory by examining the quantum numbers of the known standard model particles and by the requirement of anomaly cancellation. Once the particle content is fixed we can write down the most general renormalizable superpotential. However such a superpotential will contain terms breaking lepton and baryon number which leads us to the concept of R-parity conservation. The question of supersymmetry breaking is discussed next. We list the possible soft breaking terms. However the Lagrangian involving the most general soft breaking terms is phenomenologically intractable because of the appearance of many new parameters. It also leads to some unacceptable predictions. To reduce the number of parameters we restrict ourselves to the case with universal soft breaking terms at the GUT scale. We motivate the need for universal soft breaking terms by the apparent unification of gauge couplings in the MSSM and by the absence of flavor changing neutral currents. Then we discuss radiative electroweak symmetry breaking. Radiative breaking arises because the one-loop corrections involving the large top Yukawa coupling change the sign of the soft breaking mass parameter of the up-type Higgs doublet, this way introducing a nontrivial minimum in the Higgs potential. Finally we give an overview of the possible mixings in the MSSM and enumerate the physical (mass eigenstate) fields together with the mass matrices.

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CUONG, NGUYEN CHINH, i HA HUY BANG. "SQUARK DECAYS INTO CHARGINOS AND NEUTRALINOS IN THE MSSM WITH COMPLEX PARAMETER". Communications in Physics 14, nr 1 (15.04.2007): 23. http://dx.doi.org/10.15625/0868-3166/14/1/15.

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In this paper, we consider squark decays into charginos and neutralinos with complex parameters. The one loop vertex correction to the decay width has been calculated. The numerical results are also perfomed.

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CUONG, NGUYEN CHINH, i HA HUY BANG. "SQUARK DECAYS INTO CHARGINOS AND NEUTRALINOS IN THE MSSM WITH COMPLEX PARAMETER". Communications in Physics 14, nr 1 (15.04.2007): 23. http://dx.doi.org/10.15625/0868-3166/15.

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In this paper, we consider squark decays into charginos and neutralinos with complex parameters. The one loop vertex correction to the decay width has been calculated. The numerical results are also perfomed.

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YANG, JING, i KE-SHENG SUN. "MSSM PREDICTIONS ON LEPTON FLAVOR VIOLATION DECAYS OF VECTOR MESONS". Modern Physics Letters A 27, nr 40 (19.12.2012): 1250230. http://dx.doi.org/10.1142/s0217732312502306.

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In the minimal supersymmetric extension of the Standard Model (MSSM) the interactions between the SUSY particles and the Standard Model (SM) particles can contribute to the lepton flavor violation (LFV) decays of vector mesons at loop level. Taking the constraint on the lightest Higgs mass around 126 GeV, we study these decays by a scan over the parameter space which gives the predictions on μ-e conversion and τ→μγ satisfying the experimental bounds. The branching ratios of the vector mesons decays into eμ are strongly suppressed. However, the branching ratios of the heavy flavor mesons decays into τμ can reach the experimental sensitivity in near future. Therefore, the experimental signals of these decays may serve as a probe of the MSSM.

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28

Nevzorov, Roman. "Leptogenesis and Dark Matter–Nucleon Scattering Cross Section in the SE6SSM". Universe 9, nr 3 (6.03.2023): 137. http://dx.doi.org/10.3390/universe9030137.

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The E6-inspired extension of the minimal supersymmetric (SUSY) standard model (MSSM) with an extra U(1)N gauge symmetry, under which right-handed neutrinos have zero charge, involves exotic matter beyond the MSSM to ensure anomaly cancellation. We consider the variant of this extension (SE6SSM) in which the cold dark matter is composed of the lightest neutral exotic fermion and gravitino. The observed baryon asymmetry can be induced in this case via the decays of the lightest right-handed neutrino/sneutrino into exotic states even for relatively low reheating temperatures TR≲106−7GeV. We argue that there are some regions of the SE6SSM parameter space, which are safe from all current constraints, and discuss the implications of this model for collider phenomenology.

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29

YU. BOGACHEV, D., A. V. GLADYSHEV, D. I. KAZAKOV i A. S. NECHAEV. "LIGHT SUPERPARTNERS AT HADRON COLLIDERS". International Journal of Modern Physics A 21, nr 26 (20.10.2006): 5221–39. http://dx.doi.org/10.1142/s0217751x06034008.

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Uncertainties of the MSSM predictions are due to an unknown SUSY breaking mechanism. To reduce these uncertainties, one usually imposes constraints on the MSSM parameter space. Recently, two new constraints became available, both from astrophysics: WMAP precise measurement of the amount of the Dark Matter in the Universe and EGRET data on an excess in diffuse gamma ray flux. Being interpreted as a manifestation of supersymmetry these data lead to severe constraints on parameter space and single out a very restricted area. The key feature of this area is the splitting of light gauginos from heavy squarks and sleptons. We study the phenomenological properties of this scenario, in particular, the cross-sections of superparticle production, their decay patterns and signatures for observation at hadron colliders, Tevatron and LHC. We found that weakly interacting particles in this area are very light so that the cross-sections may reach fractions of a pb with jets and/or leptons as final states accompanied by missing energy taken away by light neutralino with a mass around 100 GeV.

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30

Gladyshev, A. V., D. I. Kazakov i M. G. Paucar. "Long-lived charginos in the focus-point region of the MSSM parameter space". Journal of Physics G: Nuclear and Particle Physics 36, nr 12 (3.11.2009): 125009. http://dx.doi.org/10.1088/0954-3899/36/12/125009.

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31

Trotta, Roberto, Farhan Feroz, Mike Hobson, Leszek Roszkowski i Roberto Ruiz de Austri. "The impact of priors and observables on parameter inferences in the constrained MSSM". Journal of High Energy Physics 2008, nr 12 (9.12.2008): 024. http://dx.doi.org/10.1088/1126-6708/2008/12/024.

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32

Eberl, H., K. Hidaka i E. Ginina. "Correlation between the decays h0 → γγ/gg in the MSSM with quark flavor violation". International Journal of Modern Physics A 34, nr 22 (7.08.2019): 1950120. http://dx.doi.org/10.1142/s0217751x19501203.

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We study the loop-induced decays [Formula: see text] and [Formula: see text] in the Minimal Supersymmetric Standard Model (MSSM) with quark flavor violation (QFV), identifying [Formula: see text] with the Higgs boson with a mass of 125 GeV, where [Formula: see text] and [Formula: see text] are photon and gluon, respectively. We perform a MSSM parameter scan and a detailed analysis around a fixed reference point respecting theoretical constraints from vacuum stability conditions and experimental constraints, such as those from [Formula: see text]-meson data and electroweak precision data, as well as recent limits on Supersymmetric (SUSY) particle masses from LHC experiments. We find that (i) the relative deviation of the decay width [Formula: see text] from the Standard Model value, [Formula: see text], can be large and negative, [Formula: see text], (ii) the analogous deviation of [Formula: see text] is strongly correlated, [Formula: see text] for [Formula: see text], (iii) the relative deviation of the width ratio [Formula: see text] from the SM value, [Formula: see text], can be large (up to [Formula: see text]20%), (iv) the deviations can be large due to the up-type squark loop contributions, (v) the SUSY QFV parameters can have a significant effect on these deviations. Such large deviations can be observed at a future [Formula: see text] collider like ILC. Observation of the deviation patterns as shown in this study would favor the MSSM with flavor-violating squark mixings and encourage to perform further studies in this model.

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33

BOZ, M., D. A. DEMIR i N. K. PAK. "Q-BALL FORMATION IN THE MSSM WITH EXPLICIT CP VIOLATION". Modern Physics Letters A 15, nr 07 (7.03.2000): 517–23. http://dx.doi.org/10.1142/s0217732300000505.

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Q-balls generically exist in the supersymmetric extensions of the standard model. Taking into account the additional sources of CP violation, which are naturally accommodated by the supersymmetric models, it is shown that the Q-ball matter depends additionally on individual CP phases, whereas mass per unit charge in the Q-ball depends only on the relative phases. There are regions of the parameter space where there is no stable Q-ball solution in the CP-conserving limit whereas finite CP phases induce a stable Q-ball.

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34

LIN, CHIA-MIN, i KINGMAN CHEUNG. "SUPERNATURAL A-TERM INFLATION". Modern Physics Letters A 25, nr 17 (7.06.2010): 1425–29. http://dx.doi.org/10.1142/s0217732310033207.

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Following Ref. 10, we explore the parameter space of the case when the supersymmetry (SUSY) breaking scale is lower, for example, in gauge mediated SUSY breaking model. During inflation, the form of the potential is V0 plus MSSM (or A-term ) inflation. We show that the model works for a wide range of the potential V0 with the soft SUSY breaking mass m ~ O(1) TeV. The implication to MSSM (or A-term) inflation is that the flat directions which is lifted by the non-renormalizable terms described by the superpotential [Formula: see text] with p = 4 and p = 5 are also suitable to be an inflaton field for λp = O(1) provided there is an additional false vacuum term V0 with appropriate magnitude. The flat directions correspond to p = 6 also works for [Formula: see text].

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35

Arhrib, Abdesslam, Duarte Azevedo, Rachid Benbrik, Hicham Harouiz, Stefano Moretti, Riley Patrick i Rui Santos. "Signal versus Background Interference in H+ → tb for MSSM Benchmark Scenarios". EPJ Web of Conferences 245 (2020): 06037. http://dx.doi.org/10.1051/epjconf/202024506037.

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In this talk an investigation into the interference effects between the process pp→t̄bH+ followed by the decay H+→tb̄ and the background process pp → tt̄bb̄ is presented. The level of interference in parts of the parameter space is shown to be high and as such it may spoil the results of typical analyses which treat signal and background as independent. This is shown for two benchmarks of the MSSM.

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36

WHITE, M. J. "SUSY AND DARK MATTER CONSTRAINTS FROM THE LHC". International Journal of Modern Physics A 22, nr 31 (20.12.2007): 5771–84. http://dx.doi.org/10.1142/s0217751x07039006.

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The LHC will have much to say about the mysteries of dark matter, and this talk reviews this potential within the context of supersymmetry (SUSY). The SUSY search reach of CMS and ATLAS is presented, followed by a brief introduction to the methods of SUSY parameter measurement. A representative ATLAS study is then used to explain how the LHC can be used to obtain a measurement of the relic density of a neutralino WIMP candidate. Finally, the prospect of success is considered by looking at different points in the MSSM parameter space.

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37

ROMÃO, J. C., J. L. DIAZ-CRUZ, F. DE CAMPOS i J. W. F. VALLE. "DETECTION OF INTERMEDIATE MASS HIGGS BOSONS FROM SPONTANEOUSLY BROKEN R-PARITY SUPERSYMMETRY". Modern Physics Letters A 09, nr 09 (21.03.1994): 817–27. http://dx.doi.org/10.1142/s0217732394000642.

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The Higgs sector in spontaneously broken R-parity supersymmetry (RPSUSY) shows interesting features that require new search techniques. Both the mass spectrum and production rates may differ from the Standard Model and minimal supersymmetric model (MSSM) expectations. For some parameter choices, the dominant Higgs boson decay mode can even be invisible, leading to events with large missing transverse momentum carried by superweakly interacting majorons. We study the reaction pp → Z + H + X, and find that it can lead to detectable events at LHC/SSC for a large region of parameter space.

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38

ROSZKOWSKI, LESZEK, ENRICO MARIA SESSOLO i YUE-LIN SMING TSAI. "BAYESIAN IMPLICATIONS OF COLLIDER AND SUSY DARK MATTER DIRECT AND INDIRECT SEARCHES". Modern Physics Letters A 28, nr 02 (20.01.2013): 1340008. http://dx.doi.org/10.1142/s0217732313400087.

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In this talk we present our recent Bayesian analyses of the Constrained MSSM in which the model's parameter space is constrained by the CMS αT 1.1/fb data at the LHC, the XENON100 dark matter direct detection data, and Fermi-LAT γ-ray data from dwarf spheroidal galaxies (dSphs). We also show that the projected one-year sensitivities for annihilation-induced neutrinos from the Sun in the 86-string configuration of IceCube/DeepCore have the potential to yield additional constraining power on the parameter space of the CMSSM.

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39

AMBROSO, MICHAEL, i BURT A. OVRUT. "THE MASS SPECTRA, HIERARCHY AND COSMOLOGY OF B-L MSSM HETEROTIC COMPACTIFICATIONS". International Journal of Modern Physics A 26, nr 09 (10.04.2011): 1569–627. http://dx.doi.org/10.1142/s0217751x11052943.

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The matter spectrum of the MSSM, including three right-handed neutrino supermultiplets and one pair of Higgs–Higgs conjugate superfields, can be obtained by compactifying the E8 ×E8 heterotic string and M-theory on Calabi–Yau manifolds with specific SU(4) vector bundles. These theories have the standard model gauge group augmented by an additional gauged U(1)B-L. Their minimal content requires that the B-L gauge symmetry be spontaneously broken by a vacuum expectation value of at least one right-handed sneutrino. In previous papers, we presented the results of a quasianalytic renormalization group analysis showing that B-L gauge symmetry is indeed radiatively broken with an appropriate B-L/electroweak hierarchy. In this paper, we extend these results by (1) enlarging the initial parameter space and (2) explicitly calculating the renormalization group equations numerically. The regions of the initial parameter space leading to realistic vacua are presented and the B-L/electroweak hierarchy computed over these regimes. At representative points, the mass spectrum for all sparticles and Higgs fields is calculated and shown to be consistent with present experimental bounds. Some fundamental phenomenological signatures of a nonzero right-handed sneutrino expectation value are discussed, particularly the cosmology and proton lifetime arising from induced lepton and baryon number violating interactions.

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40

JURČIŠIN, M., i D. I. KAZAKOV. "INFRARED QUASI FIXED POINTS AND MASS PREDICTIONS IN THE MSSM II: LARGE tan β SCENARIO". Modern Physics Letters A 14, nr 10n11 (10.04.1999): 671–87. http://dx.doi.org/10.1142/s0217732399000729.

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We consider the infrared quasi fixed point solutions of the renormalization group equations for the Yukawa couplings and soft supersymmetry breaking parameters in the MSSM in the large tan β regime. The existence of ir quasi fixed points together with the values of gauge couplings, third generation quarks, lepton and Z-boson masses allows one to predict masses of the Higgs bosons and SUSY particles as functions of the only free parameter, m1/2, or the gluino mass. The lightest Higgs boson mass for M SUSY ≈1 TeV is found to be mh=128.2-0.4-7.1± 5 GeV for μ>0 and mh= 120.6-0.1-3.8±5 GeV for μ<0.

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41

Ellis, John, Toby Falk, Keith A. Olive i Mark Srednicki. "Calculations of neutralino–stau coannihilation channels and the cosmologically relevant region of MSSM parameter space". Astroparticle Physics 13, nr 2-3 (maj 2000): 181–213. http://dx.doi.org/10.1016/s0927-6505(99)00104-8.

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42

Ramage, M. R. "Effects of SO(10)-inspired scalar non-universality on the MSSM parameter space at largetanβ". Nuclear Physics B 720, nr 1-2 (sierpień 2005): 137–81. http://dx.doi.org/10.1016/j.nuclphysb.2005.04.039.

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43

Casas, J. A., A. Lleyda i C. Muñoz. "Strong constraints on the parameter space of the MSSM from charge and color breaking minima". Nuclear Physics B 471, nr 1-2 (lipiec 1996): 3–58. http://dx.doi.org/10.1016/0550-3213(96)00194-0.

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44

LIU, JIAN JUN, CHONG SHENG LI, LI LIN YANG i LI GANG JIN. "TOP-CHARM ASSOCIATED PRODUCTION VIA SUSY FCNC COUPLINGS AT THE CERN LHC IN THE MSSM". Modern Physics Letters A 19, nr 04 (10.02.2004): 317–26. http://dx.doi.org/10.1142/s0217732304012940.

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We evaluate the total cross-sections of top-charm associated production induced by SUSY–QCD FCNC at the LHC within the general unconstrained MSSM framework. Our results show that these production rates may be as large as a few pb for favorable parameter values allowing by current precise experiments. It means that the LHC may produce abundant events of this process, and the SUSY FCNC effects through the above process may be observable in the future experiments.

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45

GLADYSHEV, A. V., D. I. KAZAKOV i M. G. PAUCAR. "PRODUCTION OF LONG-LIVED CHARGED SLEPTONS AT LHC". Modern Physics Letters A 20, nr 40 (28.12.2005): 3085–93. http://dx.doi.org/10.1142/s0217732305019195.

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We analyze the MSSM parameter space and discuss the narrow band in the so-called co-annihilation region where sleptons may be long-lived particles. This region is consistent with the WMAP restrictions on the Dark matter and depends on the value of tan β. In this region staus are long-lived and may go through the detector. Due to a relatively small mass (150–850 GeV) their production cross-section at LHC may reach a few % pb.

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46

Kim, Jong Soo, Daniel E. López-Fogliani, Andres D. Perez i Roberto Ruiz de Austri. "Right-handed sneutrino and gravitino multicomponent dark matter in light of neutrino detectors". Journal of Cosmology and Astroparticle Physics 2023, nr 04 (1.04.2023): 050. http://dx.doi.org/10.1088/1475-7516/2023/04/050.

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Abstract We investigate the possibility that right-handed (RH) sneutrinos and gravitinos can coexist and explain the dark matter (DM) problem. We compare extensions of the minimal supersymmetric standard model (MSSM) and the next-to-MSSM (NMSSM) adding RH neutrinos superfields, with special emphasis on the latter. If the gravitino is the lightest supersymmetric particle (LSP) and the RH sneutrino the next-to-LSP (NLSP), the heavier particle decays to the former plus left-handed (LH) neutrinos through the mixing between the scalar partners of the LH and RH neutrinos. However, the interaction is suppressed by the Planck mass, and if the LH-RH sneutrino mixing parameter is small, ≪ O(10-2), a long-lived RH sneutrino NLSP is possible even surpassing the age of the Universe. As a byproduct, the NLSP to LSP decay produces monochromatic neutrinos in the ballpark of current and planned neutrino telescopes like Super-Kamiokande, IceCube and Antares that we use to set constraints and show prospects of detection. In the NMSSM+RHN, assuming a gluino mass parameter M 3 = 3 TeV we found the following lower limits for the gravitino mass m 3/2 ≳ 1-600 GeV and the reheating temperature T R ≳ 105 - 3 × 107 GeV, for mν̃ R 10-800 GeV. If we take M 3 = 10 TeV, then the limits on TR are relaxed by one order of magnitude.

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47

WEST, STEPHEN M. "NEUTRINO MASSES AND TeV SCALE RESONANT LEPTOGENESIS FROM SUPERSYMMETRY BREAKING". Modern Physics Letters A 21, nr 21 (10.07.2006): 1629–46. http://dx.doi.org/10.1142/s0217732306021153.

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We review a class of supersymmetric models in which the light neutrino masses result from higher-dimensional supersymmetry-breaking terms in the MSSM super- and Kähler-potentials. The mechanism used in these models is closely related to the Giudice–Masiero mechanism for the MSSM μ parameter and leads to TeV-scale right-handed neutrino and sneutrino states. In these models, the dominant contribution to the light neutrino (Majorana) mass matrix is a one-loop term with a sub-dominant tree-level "seesaw" contribution. It is also shown that it is possible to construct a natural model of TeV-scale leptogenesis via the resonant behavior of the one-loop self-energy contribution to the right-handed neutrino (Ni) decay. This model addresses the primary problems of previous phenomenological studies of low-energy leptogenesis: a rational for TeV-scale right-handed neutrinos with small Yukawa couplings; the origin of the tiny, but non-zero mass splitting required between at least two Ni masses; and the necessary non-trivial breaking of flavor symmetries in the right-handed neutrino sector.

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48

Drees, M., i M. Rauch. "Complete one-loop calculation of the T-violating D-parameter in neutron decay in the MSSM". European Physical Journal C 29, nr 4 (sierpień 2003): 573–85. http://dx.doi.org/10.1140/epjc/s2003-01247-8.

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49

Astapov, Konstantin. "Sgoldstino searches at CERN Electron Beam Dump". EPJ Web of Conferences 182 (2018): 02007. http://dx.doi.org/10.1051/epjconf/201818202007.

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In the present paper we discussed light scalar sgoldstino in context of low scale SUSY breaking. We analyzed electromagnetic sector of interaction of sgoldstino with SM. We also took into account the impact on this interaction of the admixture of lightest MSSM Higgs scalar in the sgoldstino state. The signal rate of rare sgoldstino decays into SM particles at CERN electron beam dump experiment NA64 for the scalar sgoldstino has been estimated. We used expected signal rate to obtain some regions of sgoldstino parameter space (sgoldstino mass and SUSY breaking scale √F).

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50

Chen, Ning, Jiayin Gu, Tao Han, Honglei Li, Zhen Liu, Huayang Song, Shufang Su, Wei Su, Yongcheng Wu i Jin Min Yang. "New physics implication of Higgs precision measurements". International Journal of Modern Physics A 34, nr 13n14 (20.05.2019): 1940012. http://dx.doi.org/10.1142/s0217751x19400128.

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Studying the properties of the Higgs boson can be an important window to explore the physics beyond the Standard Model (SM). In this work, we present studies on the implications of the Higgs precision measurements at future Higgs Factories. We perform a global fit to various Higgs search channels to obtain the 95% C.L. constraints on the model parameter spaces of two-Higgs Doublet Model (2HDM) and Minimal Supersymmetric Standard Model (MSSM). In the 2HDM, we analyze tree-level effects as well as one-loop contributions from the heavy Higgs bosons. The strong constraints on [Formula: see text], heavy Higgs masses and their mass splitting are complementary to direct search of the LHC as well as possible future [Formula: see text] pole precision measurements. For the MSSM, we study both the Higgs couplings and mass precisions. The constraints on the CP-odd Higgs mass [Formula: see text] and stop mass scale [Formula: see text] can be complementary to the direct search of HL-LHC. We also compare the sensitivity of various future Higgs factories, namely, Circular Electron Positron Collider (CEPC), Future Circular Collider (FCC)-ee and International Linear Collider (ILC).

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