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Journal articles on the topic 'SUSY - Physics [Beyond Standard Model]'

Author: Grafiati

Published: 7 September 2023

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1

KAZAKOV, D. I. "BEYOND THE STANDARD MODEL." International Journal of Modern Physics A 22, no. 30 (December 10, 2007): 5502–12. http://dx.doi.org/10.1142/s0217751x07038761.

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Review of recent developments in attempts to go beyond the Standard Model is given. We concentrate on three main unresolved problems: mechanism of electroweak symmetry breaking, expected new physics at the TeV scale (mainly SUSY) and the origin of the Dark matter.

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2

INAMI, T., C. S. LIM, and A. YAMADA. "RADIATIVE CORRECTION PARAMETER S IN BEYOND-THE-STANDARD MODELS." Modern Physics Letters A 07, no. 30 (September 28, 1992): 2789–97. http://dx.doi.org/10.1142/s021773239200416x.

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The electroweak parameter S, one of the three parameters describing the oblique radiative corrections due to heavy particles, is estimated in three types of beyond-the-standard models: multi-doublet Higgs model, technicolor-like model and minimal SUSY model. We show that the global chiral symmetry SU (2)L or SU (2)R plays a useful role in analyzing S.

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3

LORENZO DÍAZ-CRUZ, J. "TRACING THE GAUGE ORIGIN OF YUKAWA AND HIGGS PARAMETERS BEYOND THE STANDARD MODEL." Modern Physics Letters A 20, no. 31 (October 10, 2005): 2397–408. http://dx.doi.org/10.1142/s0217732305017949.

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We discuss possible realizations of the hypothesis that all the fundamental interactions of the elementary particles should be of gauge type, including the Yukawa and Higgs ones. In the minimal SUSY extension of the standard model, where the quartic Higgs couplings are "gauged" through the D-terms, it is also possible to generate radiatively the Yukawa matrices for the light generations, thus expressing them as functions of gauge couplings. The program can also be applied to the SUSY LR model, where the possibility to induce radiatively the mixing angles, can help to make viable the parity solution to the strong CP problem. The superpotential of the model still includes some non-gauge couplings, namely, the Yukawa constants for the third generation and the trilinear terms λχ L Φχ R and [Formula: see text], involving the Higgs bi-doublet (Φ) and two pairs of doublets (χ L , χ R and their conjugates). Additional progress to relate these parameters to gauge couplings, can be made by embedding the LR model within a SUSY model SU (4)W× U (1)B-L in five dimensions, where the Higgs bi-doublet is identified as the extra component of the 5D gauge field.

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4

SMIRNOV, A. Y. "NEUTRINO PHYSICS: OPEN THEORETICAL QUESTIONS." International Journal of Modern Physics A 19, no. 08 (March 30, 2004): 1180–97. http://dx.doi.org/10.1142/s0217751x0401910x.

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We know that neutrino mass and mixing provide a window to physics beyond the Standard Model. Now this window is open, at least partly. And the questions are: what do we see, which kind of new physics, and how far "beyond"? I summarize the present knowledge of neutrino mass and mixing, and then formulate the main open questions. Following the bottom-up approach, properties of the neutrino mass matrix are considered. Then different possible ways to uncover the underlying physics are discussed. Some results along the line of seesaw, GUT and SUSY GUT are reviewed.

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5

Nevzorov, R. "E6 inspired SUSY models with custodial symmetry." International Journal of Modern Physics A 33, no. 31 (November 10, 2018): 1844007. http://dx.doi.org/10.1142/s0217751x18440074.

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The breakdown of [Formula: see text] within the supersymmetric (SUSY) Grand Unified Theories (GUTs) can result in SUSY extensions of the standard model (SM) based on the SM gauge group together with extra [Formula: see text] gauge symmetry under which right-handed neutrinos have zero charge. In these [Formula: see text] extensions of the minimal supersymmetric standard model (MSSM) a single discrete [Formula: see text] symmetry may be used to suppress the most dangerous operators, that give rise to proton decay as well as nondiagonal flavour transitions at low energies. The SUSY models under consideration involves [Formula: see text] and extra exotic matter beyond the MSSM. We discuss leptogenesis within this SUSY model and argue that the extra exotic states may lead to the nonstandard Higgs decays.

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6

King, Stephen F., Stefano Moretti, and Roman Nevzorov. "A Review of the Exceptional Supersymmetric Standard Model." Symmetry 12, no. 4 (April 4, 2020): 557. http://dx.doi.org/10.3390/sym12040557.

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Local supersymmetry (SUSY) provides an attractive framework for the incorporation of gravity and unification of gauge interactions within Grand Unified Theories (GUTs). Its breakdown can lead to a variety of models with softly broken SUSY at low energies. In this review article, we focus on the SUSY extension of the Standard Model (SM) with an extra U ( 1 ) N gauge symmetry originating from a string-inspired E 6 GUTs. Only in this U ( 1 ) extension of the minimal supersymmetric standard model (MSSM) can the right-handed neutrinos be superheavy, providing a mechanism for the baryon asymmetry generation. The particle content of this exceptional supersymmetric standard model (E 6 SSM) includes three 27 representations of the E 6 group, to ensure anomaly cancellation. In addition it also contains a pair of S U ( 2 ) W doublets as required for the unification of gauge couplings. Thus, E 6 SSM involves exotic matter beyond the MSSM. We consider symmetries that permit suppressing flavor changing processes and rapid proton decay, as well as gauge coupling unification, the gauge symmetry breaking and the spectrum of Higgs bosons in this model. The possible Large Hadron Collider (LHC) signatures caused by the presence of exotic states are also discussed.

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7

Perieanu, Adrian. "Results on non-SUSY searches for physics beyond standard model in pp collisions at CMS." Frontiers of Physics 8, no. 3 (March 8, 2013): 257–69. http://dx.doi.org/10.1007/s11467-013-0295-y.

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8

Stoica, Sabin. "Double-beta decay and its potential to explore beyond standard model physics." International Journal of Modern Physics A 33, no. 34 (December 10, 2018): 1845012. http://dx.doi.org/10.1142/s0217751x18450124.

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Double-beta decay (DBD) is a rare nuclear process of great interest due to its potential to provide information about physics beyond the Standard Model (BSM). For example, the discovery of the neutrinoless double-beta [Formula: see text] decay mode could give information about important issues such as possible violations of Lorentz symmetry and lepton number, nature of neutrinos (are they Dirac- or Majorana-like particles?), neutrino absolute masses, neutrino mass hierarchy, existence of heavy (sterile) neutrinos, etc. In the theoretical study of DBD, one needs a precise calculation of the nuclear matrix elements (NMEs) and phase space factors (PSFs) entering the half-lives formulas, for different decay modes, transitions and mechanisms of occurrence. Reliable computations of these quantities may result in reliable predictions of DBD half-lives and constrains of the BSM parameters related to the possible mechanisms that can contribute to the [Formula: see text] decay. In this paper, I briefly review the theoretical challenges in the study of [Formula: see text] decay. I describe the computation of the NMEs and PSFs and present results for a number of selected nuclei. Then, I show the broader potential of this process to provide information about BSM physics and present new upper limits for parameters associated with light neutrino, heavy neutrino and SUSY exchange mechanisms. Finally, I suggest a more consistent approach to calculate the NMEs and PSFs, namely to compute directly their product and discuss some possibilities to reduce the errors related to the uncertain value of the axial-vector constant.

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9

Venditti, Rosamaria. "Prospects for Higgs Boson Measurements and Beyond Standard Model Physics at the High-Luminosity LHC with CMS." EPJ Web of Conferences 192 (2018): 00032. http://dx.doi.org/10.1051/epjconf/201819200032.

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The High-Luminosity Large Hadron Collider (HL-LHC) is a major upgrade of the LHC, expected to deliver an integrated luminosity of up to 3000/fb over one decade. The very high instantaneous luminosity will lead to about 200 proton-proton collisions per bunch crossing (pileup) superimposed to each event of interest, therefore providing extremely challenging experimental conditions. The scientific goals of the HL-LHC physics program include precise measurement of the properties of the recently discovered standard model Higgs boson and searches for beyond the standard model physics (heavy vector bosons, SUSY, dark matter and exotic long-lived signatures, to name a few). In this contribution we will present the strategy of the CMS experiment to investigate the feasibility of such search and quantify the increase of sensitivity in the HL-LHC scenario.

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10

CHOUDHURY, S. RAI, A. S. CORNELL, NAVEEN GAUR, and G. C. JOSHI. "SIGNATURES OF NEW PHYSICS IN DILEPTONIC B-DECAYS." International Journal of Modern Physics A 21, no. 12 (May 10, 2006): 2617–34. http://dx.doi.org/10.1142/s0217751x06029491.

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Leptonic decays of B-mesons are theoretically very clean probes for testing the Standard Model (SM) and possible physics beyond it. Amongst the various leptonic decays of the B-meson, the pure dileptonic decay B → ℓ+ ℓ- is very important, as this mode is helicity suppressed in the SM but can be substantially enhanced in some of the models beyond the SM, such as supersymmetric (SUSY) theories and the two Higgs doublet model (2HDM). Although the purely dileptonic decay mode is helicity suppressed in the SM its associated mode B → ℓ+ ℓ-γ does not have the same suppression, due to the presence of γ in the final state. In this paper we will also analyze the effects of enhanced Z-penguins on these two decay modes.

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11

KIKUCHI, TATSURU. "BOSONIC SEESAW AND A SOLUTION TO THE μ PROBLEM IN THE UNPARTICLE PHYSICS." Modern Physics Letters A 25, no. 09 (March 21, 2010): 691–701. http://dx.doi.org/10.1142/s0217732310032767.

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Recently, conceptually new physics beyond the Standard Model has been proposed by Georgi, where a new physics sector becomes conformal and provides "unparticle" which couples to the Standard Model sector through higher dimensional operators in low energy effective theory. Among several possibilities, we focus on operators involving the unparticle and Higgs boson. Once the Higgs develops the vacuum expectation value (VEV), the conformal symmetry is broken and as a result, the mixing between the unparticle and the Higgs boson emerges. In the former part of this paper, we consider a natural realization of bosonic seesaw in the context of unparticle physics. In this framework, the negative mass squared or the electroweak symmetry breaking vacuum is achieved as a result of mass matrix diagonalization. So, the bosonic seesaw mechanism for the electroweak symmetry breaking can naturally be understood in the framework of unparticle physics. In the latter part of this paper, we consider the unparticle as a hidden sector of supersymmetry breaking, and give some phenomenological consequences of this scenario. The result shows that there is a possibility for the unparticle as a hidden sector in SUSY breaking sector, and can provide a solution to the μ problem in SUSY models.

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12

HAAS, RICHARD. "SEARCH FOR SUSY WITH $/\kern-7.2pt E_T$ AND JETS AT CDF." International Journal of Modern Physics A 16, supp01b (September 2001): 793–96. http://dx.doi.org/10.1142/s0217751x01008114.

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Events with signatures involving large missing transverse energy [Formula: see text] are among the quintessential search modes for R-parity conserving supersymmetry. CDF has conducted two recent analyses for supersymmetry which use [Formula: see text] and jets. The [Formula: see text] and monojet signature is employed to determine process independent limits for the production of new physics beyond the Standard Model and then applied to models of spontaneous breaking of supersymmetry to determine limits on the supersymmetry breaking parameter and the gravitino mass. Direct searches for scalar top and scalar bottom quarks within the framework of supersymmetric models are performed using a signature of [Formula: see text] and two heavy flavor jets. Since the data is found to be consistent with Standard Model expectations, limits are determined in the mass planes [Formula: see text] and [Formula: see text].

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13

Jenni, Peter. "Early physics results." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 370, no. 1961 (February 28, 2012): 933–49. http://dx.doi.org/10.1098/rsta.2011.0463.

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For the past year, experiments at the Large Hadron Collider (LHC) have started exploring physics at the high-energy frontier. Thanks to the superb turn-on of the LHC, a rich harvest of initial physics results have already been obtained by the two general-purpose experiments A Toroidal LHC Apparatus (ATLAS) and the Compact Muon Solenoid (CMS), which are the subject of this report. The initial data have allowed a test, at the highest collision energies ever reached in a laboratory, of the Standard Model (SM) of elementary particles, and to make early searches Beyond the Standard Model (BSM). Significant results have already been obtained in the search for the Higgs boson, which would establish the postulated electro-weak symmetry breaking mechanism in the SM, as well as for BSM physics such as Supersymmetry (SUSY), heavy new particles, quark compositeness and others. The important, and successful, SM physics measurements are giving confidence that the experiments are in good shape for their journey into the uncharted territory of new physics anticipated at the LHC.

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14

Papavergou, Ioanna, and Emmanouil Vourliotis. "Search for physics beyond the standard model in final states with two or three soft leptons and missing transverse momentum in proton-proton collisions at s=13 TeV." Journal of Physics: Conference Series 2105, no. 1 (November 1, 2021): 012012. http://dx.doi.org/10.1088/1742-6596/2105/1/012012.

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Abstract The most recent CMS results from a search for supersymmetry (SUSY) with a compressed mass spectrum in leptonic final states will be presented. The search is targeting signatures with missing transverse momentum and two or three low-momentum (soft) leptons. The dataset used is collected by the CMS experiment during the Run–2 proton-proton collisions at s = 13 TeV at the LHC, and corresponds to an integrated luminosity of up to 137 fb−1. The observed data are found to be in agreement with the Standard Model prediction and exclusion upper limits are set on the SUSY particles production cross section. The results are interpreted in terms of electroweakino and top squark pair production. In both cases, a small mass difference between the produced SUSY particles and the lightest neutralino is considered. A wino-bino and a higgsino simplified models are used for the electroweakino interpretation. Exclusion limits at 95% confidence level are set on x ˜ 2 0 / x ˜ 1 ± masses up to 280 GeV for a mass difference between the x ˜ 2 0 / x ˜ 1 ± and the lightest neutralino of 10 GeV for the wino-bino production. In the higgsino interpretation x ˜ 2 0 / x ˜ 1 ± masses are excluded up to 210 GeV for a mass difference of 7.5 GeV and up to 150 GeV for a mass difference of 3 GeV. The results for the higgsino production are additionally interpreted in terms of a phenomenological minimal SUSY extension of the standard model, excluding the higgsino mass parameter μ up to 180 GeV for bino mass parameter M1 = 800 GeV. Upper limits at 95% confidence level are set on the top squark pair production interpretation, excluding top squark masses up to 530 GeV in the four-body top squark decay model and up to 475 GeV in the chargino-mediated decay model for a mass difference between the top squark and the lightest neutralino of 30 GeV.

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15

KLAPDOR-KLEINGROTHAUS, H. V. "STATUS AND PERSPECTIVES OF DOUBLE BETA DECAY — WINDOW TO NEW PHYSICS BEYOND THE STANDARD MODEL OF PARTICLE PHYSICS." International Journal of Modern Physics A 13, no. 23 (September 20, 1998): 3953–92. http://dx.doi.org/10.1142/s0217751x98001852.

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Nuclear double beta decay provides an extraordinarily broad potential to search for beyond Standard Model physics, probing already now the TeV scale, on which new physics should manifest itself. These possibilities are reviewed here. First, the results of present generation experiments are presented. The most sensitive one of them — the Heidelberg–Moscow experiment in the Gran Sasso — probes the electron mass now in the sub eV region and will reach a limit of ~ 0.1 eV in a few years. Basing to a large extent on the theoretical work of the Heidelberg Double Beta Group in the last two years, results are obtained also for SUSY models (R-parity breaking, sneutrino mass), leptoquarks (leptoquark–Higgs coupling), compositeness, right-handed W boson mass and others. These results are comfortably competitive to corresponding results from high-energy accelerators like TEVATRON, HERA, etc. Second, future perspectives of ββ research are discussed. A new Heidelberg experimental proposal (GENIUS) is presented which would allow one to increase the sensitivity for Majorana neutrino masses from the present level of at best 0.1 eV down to 0.01 or even 0.001 eV. Its physical potential would be a breakthrough into the multi-TeV range for many beyond standard models. Its sensitivity for neutrino oscillation parameters would be higher than that for all present terrestrial neutrino oscillation experiments and of those planned for the future. It could probe directly the atmospheric neutrino problem and even the large angle solution of the solar neutrino problem. It would further, already in a first step, using only 100 kg of natural Ge detectors, cover almost the full MSSM parameter space for prediction of neutralinos as cold dark matter, making the experiment competitive to LHC in the search for supersymmetry.

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KLAPDOR-KLEINGROTHAUS, H. V. "FROM NUCLEAR PHYSICS TO PHYSICS BEYOND THE STANDARD MODEL: FIRST EVIDENCE FOR LEPTON NUMBER VIOLATION AND THE MAJORANA CHARACTER OF NEUTRINOS." International Journal of Modern Physics D 13, no. 10 (December 2004): 2107–26. http://dx.doi.org/10.1142/s0218271804006656.

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Nuclear double beta decay provides an extraordinarily broad potential to search for beyond-standard-model physics. The occurrence of the neutrinoless decay(0νββ) mode has fundamental consequences: first, the total lepton number is not conserved, and second, the neutrino is a Majorana particle. Furthermore, the measured effective mass provides an absolute scale of the neutrino mass spectrum. In addition, double beta experiments yield sharp restrictions for other beyond-standard-model physics. These include SUSY models (R-parity breaking and conserving), leptoquarks (leptoquark-Higgs coupling), compositeness, left-right symmetric models (right-handed W boson mass), test of special relativity and of the equivalence principle in the neutrino sector and others. First evidence for neutrinoless double beta decay was reported by the HEIDELBERG–MOSCOW experiment in 2001. The HEIDELBERG–MOSCOW experiment is by far the most sensitive0νββ experiment since more than 10 years. It is operating 11 kg of enriched 76Ge in the GRAN SASSO Underground Laboratory. The analysis of the data taken from 2 August 1990–20 May 2003 is presented here. The collected statistics is 71.7 kg y. The background achieved in the energy region of the Q value for double beta decay is 0.11 events/kg y keV. The two-neutrino accompanied half-life is determined on the basis of more than 100,000 events to be [Formula: see text] years. The confidence level for the neutrinoless signal has been improved to a 4.2σ level. The half-life is [Formula: see text] years. The effective neutrino mass deduced is (0.2–0.6) eV (99.73% C.L.), with the consequence that neutrinos have degenerate masses. The sharp boundaries for other beyond SM physics, mentioned above, are comfortably competitive to the corresponding results from high-energy accelerators like TEVATRON, HERA, etc.

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17

WODECKI, A., and W. A. KAMIŃSKI. "HOW NEUTRINOLESS DOUBLE BETA DECAY ADDRESSES THE PROBLEM OF LIGHT NEUTRINO MASS." International Journal of Modern Physics A 15, no. 16 (June 30, 2000): 2447–53. http://dx.doi.org/10.1142/s0217751x00002512.

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Neutrinoless double beta decay is one of the exotic processes which is forbidden in the standard model (SM). Its discovery is expected to shed some light on various aspects of nonstandard physics. But also from present experimental lower limits on the lifetime of this process one can extract important information about the effective electron Majorana neutrino mass, effective right handed weak interaction parameters, the Majoron coupling constant, R-parity violation SUSY parameters etc. The e-e- scattering connected directly with the inverse process to 0νββ can also provide us with such interesting physics beyond SM. In this contribution we discuss the formalism which allows deduction of this valuable knowledge from the 0νββ experiments. Results on physics of the R-parity violation are also presented to some extent.

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18

Antusch, Stefan, and Constantin Sluka. "Testable SUSY spectra from GUTs at a 100 TeV pp collider." International Journal of Modern Physics A 31, no. 33 (November 22, 2016): 1644011. http://dx.doi.org/10.1142/s0217751x16440115.

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Grand Unified Theories (GUTs) are attractive candidates for more fundamental elementary particle theories. They cannot only unify the Standard Model (SM) interactions but also different types of SM fermions, in particular quarks and leptons, in joint representations of the GUT gauge group. We discuss how comparing predictive supersymmetric GUT models with the experimental results for quark and charged lepton masses leads to constraints on the SUSY spectrum. We show an example from a recent analysis where the resulting superpartner masses where found just beyond the reach of LHC Run 1, but fully within the reach of a 100 TeV [Formula: see text] collider.

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19

Cei, F., and D. Nicolò. "Lepton Flavour Violation Experiments." Advances in High Energy Physics 2014 (2014): 1–31. http://dx.doi.org/10.1155/2014/282915.

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Lepton Flavour Violation in the charged lepton sector (CLFV) is forbidden in the Minimal Standard model and strongly suppressed in extensions of the model to include finite neutrino mixing. On the other hand, a wide class of Supersymmetric theories, even coupled with Grand Unification models (SUSY-GUT models), predict CLFV processes at a rate within the reach of new experimental searches operated with high resolution detectors at high intensity accelerators. As the Standard model background is negligible, the observation of one or more CLFV events would provide incontrovertible evidence for physics beyond Standard model, while a null effect would severely constrain the set of theory parameters. Therefore, a big experimental effort is currently (and will be for incoming years) accomplished to achieve unprecedented sensitivity on several CLFV processes. In this paper we review past and recent results in this research field, with focus on CLFV channels involving muons and tau's. We present currently operating experiments as well as future projects, with emphasis laid on how sensitivity enhancements are accompanied by improvements on detection techniques. Limitations due to systematic effects are also discussed in detail together with the solutions being adopted to overcome them.

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20

Nevzorov, Roman. "Leptogenesis and Dark Matter–Nucleon Scattering Cross Section in the SE6SSM." Universe 9, no. 3 (March 6, 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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CHENG, HSIN-CHIA. "PRECISION SUPERSYMMETRY MEASUREMENTS AT THE e-e- COLLIDER." International Journal of Modern Physics A 13, no. 14 (June 10, 1998): 2329–36. http://dx.doi.org/10.1142/s0217751x98001116.

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Measurements of supersymmetric particle couplings provide important verification of supersymmetry. If some of the superpartners are at the multi-TeV scale, they will escape direct detection at planned future colliders. However, such particles induce nondecoupling corrections in processes involving the accessible superparticles through violations of the supersymmetric equivalence between gauge boson and gaugino couplings. These violations are analogous to the oblique corrections in the electroweak sector of the Standard Model, and can be parametrized in terms of super-oblique parameters. The e-e- collision mode of a future linear collider is shown to be an excellent environment for such high precision measurements of these SUSY parameters, which will provide an important probe of superparticles beyond reachable energies.

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22

Kane, Gordon, Kuver Sinha, and Scott Watson. "Cosmological moduli and the post-inflationary universe: A critical review." International Journal of Modern Physics D 24, no. 08 (July 2015): 1530022. http://dx.doi.org/10.1142/s0218271815300220.

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We critically review the role of cosmological moduli in determining the post-inflationary history of the universe. Moduli are ubiquitous in string and M-theory constructions of beyond the Standard Model physics, where they parametrize the geometry of the compactification manifold. For those with masses determined by supersymmetry (SUSY) breaking this leads to their eventual decay slightly before Big Bang nucleosynthesis (BBN) (without spoiling its predictions). This results in a matter dominated phase shortly after inflation ends, which can influence baryon and dark matter genesis, as well as observations of the cosmic microwave background (CMB) and the growth of large-scale structure. Given progress within fundamental theory, and guidance from dark matter and collider experiments, nonthermal histories have emerged as a robust and theoretically well-motivated alternative to a strictly thermal one. We review this approach to the early universe and discuss both the theoretical challenges and the observational implications.

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23

Klapdor-Kleingrothaus, H. V. "Perspectives of double beta and dark matter search as windows to new physics." HNPS Proceedings 9 (February 11, 2020): 130. http://dx.doi.org/10.12681/hnps.2779.

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Nuclear double beta decay provides an extraordinarily broad potential to search for beyond Standard Model physics, probing already now the TeV scale, on which new physics should manifest itself. These possibilities are reviewed here. First, the results of present generation experiments are presented. The most sensitive one of them - the Heidelberg-Moscow experiment in the Gran Sasso - probes the electron mass now in the sub eV region and has reached recently a limit of ~ 0.1 eV. This limit has striking influence on presently discussed neutrino mass scenarios. Basing to a large extent on the theoretical work of the Heidelberg Double Beta Group in the last two years, results are obtained also for SUSY models (R-parity breaking, sneutrino mass), leptoquarks (leptoquark-Higgs coupling), compositeness, right-handed W boson mass, test of special relativity and equivalence principle in the neutrino sector and others. These results are comfortably competitive to corresponding results from high-energy accelerators like TEVATRON, HERA, etc. One of the enriched 7Ge detectors also yields the most stringent limits for cold dark matter (WIMPs) to date by using raw data. Second, future perspectives of ßß research are discussed. A new Heidelberg experimental proposal (GENIUS) will allow to increase the sensitivity for Majorana neutrino masses from the present level of at best 0.1 eV down to 0.01 or even 0.001 eV. Its physical potential would be a breakthrough into the multi-TeV range for many beyond standard models. Its sensitivity for neutrino oscillation parameters would be larger than of all present terrestrial neutrino oscillation experiments and of those planned for the future. It could probe directly the large angle, and for almost degenerate neutrino mass scenarios even the small angle solution of the solar neutrino problem. It would further, already in a first step using only 100 kg of natural Ge detectors, cover almost the full MSSM parameter space for prediction of neutralinos as cold dark matter, making the experiment competitive to LHC in the search for supersymmetry. Finally GENIUS could be used as the first real time detector of solar pp neutrinos.

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Barbaro, Maria B., Arturo De Pace, and Luisa Fiume. "The SuSA Model for Neutrino Oscillation Experiments: From Quasielastic Scattering to the Resonance Region." Universe 7, no. 5 (May 10, 2021): 140. http://dx.doi.org/10.3390/universe7050140.

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High-precision studies of Beyond-Standard-Model physics through accelerator-based neutrino oscillation experiments require a very accurate description of neutrino–nucleus cross-sections in a broad energy region, going from quasielastic scattering up to deep, inelastic scattering. In this work, we focus on the following processes: quasielastic scattering, two-particle-two-hole excitations, and the excitation of the first (Delta) and second (Roper) resonances of the nucleon. The nuclear model is fully relativistic and includes both one- and two-body currents. We compare our results with recent T2K and MicroBooNE data on carbon and argon targets, and present predictions for DUNE kinematics.

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Abid, Patwa. "SUSY + Beyond Standard Model Higgs Searches at the Tevatron." EPJ Web of Conferences 28 (2012): 09002. http://dx.doi.org/10.1051/epjconf/20122809002.

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26

PÉREZ-LORENZANA, ABDEL, ARNULFO ZEPEDA, and WILLIAM A. PONCE. "NON-SUSY AND SUSY ONE-STEP UNIFICATION." Modern Physics Letters A 13, no. 26 (August 30, 1998): 2153–62. http://dx.doi.org/10.1142/s021773239800228x.

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We explore the possibility of achieving one-step unification of the standard model coupling constants within non-supersymmetric and supersymmetric gauge models, which at low energies have only the standard particle content. The constraints are the experimental values of αem, αs and sin 2θW at 102 GeV, and the lower bounds for FCNC and proton decay rates. The analysis is done in a model-independent way.

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Malek, Fairouz. "Non-SUSY Beyond Standard Model Searches: Recent Results from ATLAS and CMS." Journal of Physics: Conference Series 631 (July 30, 2015): 012045. http://dx.doi.org/10.1088/1742-6596/631/1/012045.

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28

DEO, B. B. "SUPERSYMMETRY IN A STANDARD-LIKE MODEL." Modern Physics Letters A 13, no. 37 (December 7, 1998): 2971–75. http://dx.doi.org/10.1142/s0217732398003156.

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We observe that the bosons and fermions belonging to the group SU(3) × SU(2) × U(1) × U(1) behave like supersymmetric partners of each other. Except for one additional auxiliary vector boson, there are no other SUSY particles.

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29

Kim, Jihn E. "Z12−I Orbifold Compactification toward SUSY Standard Model." International Journal of Modern Physics A 22, no. 31 (December 20, 2007): 5609–21. http://dx.doi.org/10.1142/s0217751x07038876.

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We explain the orbifold compactification in string models and present a Z12−I orbifold compactification toward supersymmetric standard models. We also point out an effective R-parity from this string construction. The VEVs of gauge singlets are chosen such that phenomenological constraints are satisfied.

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30

Alvarez, Pedro D., Lucas Delage, Mauricio Valenzuela, and Jorge Zanelli. "Unconventional SUSY and Conventional Physics: A Pedagogical Review." Symmetry 13, no. 4 (April 9, 2021): 628. http://dx.doi.org/10.3390/sym13040628.

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In supersymmetric extensions of the Standard Model, the observed particles come in fermion–boson pairs necessary for the realization of supersymmetry (SUSY). In spite of the expected abundance of super-partners for all the known particles, not a single supersymmetric pair has been reported to date. Although a hypothetical SUSY breaking mechanism, operating at high energy inaccessible to current experiments cannot be ruled out, this reduces SUSY’s predictive power and it is unclear whether SUSY, in its standard form, can help reducing the remaining puzzles of the standard model (SM). Here we argue that SUSY can be realized in a different way, connecting spacetime and internal bosonic symmetries, combining bosonic gauge fields and fermionic matter particles in a single gauge field, a Lie superalgebra-valued connection. In this unconventional representation, states do not come in SUSY pairs, avoiding the doubling of particles and fields and SUSY is not a fully off-shell invariance of the action. The resulting systems are remarkably simple, closely resembling a standard quantum field theory and SUSY still emerges as a contingent symmetry that depends on the features of the vacuum/ground state. We illustrate the general construction with two examples: (i) A 2 + 1 dimensional system based on the osp(2,2|2) superalgebra, including Lorentz and u(1) generators that describe graphene; (ii) a supersymmetric extension of 3 + 1 conformal gravity with an SU(2,2|2) connection that describes a gauge theory with an emergent chiral symmetry breaking, coupled to gravity. The extensions to higher odd and even dimensions, as well as the extensions to accommodate more general internal symmetries are also outlined.

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31

SARDANASHVILY, GENNADI. "SUSY-EXTENDED FIELD THEORY." International Journal of Modern Physics A 15, no. 19 (July 30, 2000): 3095–112. http://dx.doi.org/10.1142/s0217751x00001075.

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32

Li, Tianjun, James A. Maxin, Dimitri V. Nanopoulos, and Joel W. Walker. "One-parameter model for the superworld." Modern Physics Letters A 29, no. 24 (August 7, 2014): 1430026. http://dx.doi.org/10.1142/s0217732314300262.

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We review the No-Scale ℱ-SU(5) model with extra TeV-scale vector-like flippon multiplets and its associated collider phenomenology in the search for supersymmetry at the LHC. The model framework possesses the rather unique capacity to provide a light CP-even Higgs boson mass in the favored 124–126 GeV window while simultaneously retaining a testably light SUSY spectrum that is consistent with emerging low-statistics excesses beyond the Standard Model expectation in the ATLAS and CMS multijet data.

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33

Womersley, John. "Physics beyond the standard model." Journal of Physics G: Nuclear and Particle Physics 26, no. 5 (April 28, 2000): 505–11. http://dx.doi.org/10.1088/0954-3899/26/5/306.

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34

Ellis, John. "Physics Beyond the Standard Model." Nuclear Physics A 827, no. 1-4 (August 2009): 187c—198c. http://dx.doi.org/10.1016/j.nuclphysa.2009.05.034.

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35

Hu, Yang, You-Kai Wang, Peng-Fei Yin, and Shou-Hua Zhu. "On physics beyond standard model." Frontiers of Physics 8, no. 5 (September 11, 2013): 516–39. http://dx.doi.org/10.1007/s11467-013-0382-0.

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36

SHIMA, KAZUNARI, and MOTOMU TSUDA. "LINEARIZING N=1 NONLINEAR SUPERSYMMETRY WITH HIGHER DERIVATIVE TERMS OF A NAMBU–GOLDSTONE FERMION." Modern Physics Letters A 19, no. 18 (June 14, 2004): 1357–63. http://dx.doi.org/10.1142/s0217732304013994.

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We investigate for N=1 supersymmetry (SUSY) the relation between a scalar supermultiplet of linear SUSY and a nonlinear (NL) SUSY model including apparently pathological higher derivative terms of a Nambu–Goldstone (N-G) fermion besides the Volkov–Akulov (V-A) action. SUSY invariant relations with higher derivative terms of the N-G fermion, which connect the linear and NL–SUSY models, are constructed at leading orders by heuristic arguments. We discuss a higher derivative action of the N-G fermion in the NL–SUSY model, which apparently includes a (Weyl) ghost field. By using this relation, we also explicitly prove an equivalence between the standard NL–SUSY V-A model and our NL–SUSY model with the pathological higher derivatives as an example with respect to the universality of NL–SUSY actions with the N-G fermion.

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37

Parker, M. A. "Beyond the Standard Model." Physica Scripta T158 (December 1, 2013): 014015. http://dx.doi.org/10.1088/0031-8949/2013/t158/014015.

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38

Hagiwara, Kaoru. "Higgs, SUSY and the standard model at γγ colliders." Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment 472, no. 1-2 (October 2001): 12–21. http://dx.doi.org/10.1016/s0168-9002(01)01157-3.

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39

LEIKE, A. "MEASURING THE CHARGINO MIXING PARAMETERS OF THE MINIMAL SUSY EXTENSION OF THE STANDARD MODEL AT e+e− COLLIDERS IN THE TEV REGION." International Journal of Modern Physics A 04, no. 04 (February 1989): 845–55. http://dx.doi.org/10.1142/s0217751x89000388.

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It is proposed to measure the parameters of the chargino mixing of the minimal supersymmetric extension of the standard model by chargino pair production at e+e− colliders with TeV energies. Some information about the lightest SUSY particle and its mass can be gained. With a polarized beam the minimal SUSY extension of the Standard model could be ruled out.

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CLAVELLI, L., and I. PEREVALOVA. "NUCLEAR PHYSICS IN A SUSY UNIVERSE." Modern Physics Letters A 25, no. 39 (December 21, 2010): 3291–98. http://dx.doi.org/10.1142/s0217732310034390.

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We refine a previous zeroth-order analysis of the nuclear properties of a supersymmetric (SUSY) universe with standard model particle content plus degenerate SUSY partners. No assumptions are made concerning the Higgs structure except we assume that the degenerate fermion/sfermion masses are nonzero. This alternate universe has been dubbed Susyria and it has been proposed that such a world may exist with zero vacuum energy in the string landscape.

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41

Kane, Gordon L. "Beyond the standard model." Nuclear Physics B - Proceedings Supplements 8 (June 1989): 469–79. http://dx.doi.org/10.1016/0920-5632(89)90263-6.

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42

Adachi, S. "Inclusive searches for squarks and gluinos with the ATLAS detector." EPJ Web of Conferences 182 (2018): 02001. http://dx.doi.org/10.1051/epjconf/201818202001.

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Despite the absence of experimental evidence, the weak scale supersymmetry remains as one of the best motivated and studied theoretical models beyond the Standard Model. This article summarises recent ATLAS results on inclusive searches for squarks and gluinos in R-parity conserving SUSY scenarios, including third generation squarks produced in the decay of gluinos. The searches involve final states containing jets, missing transverse momentum with and without a light lepton. No significance excess above the Standard Model prediction is observed and exclusion limits are set on 2-dimensional mass planes of benchmark signal models.

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43

Ross, Graham G. "Collider physics: beyond the standard model." Journal of Physics G: Nuclear and Particle Physics 26, no. 5 (April 28, 2000): 455–62. http://dx.doi.org/10.1088/0954-3899/26/5/301.

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44

GNINENKO, S. N., N. V. KRASNIKOV, and A. RUBBIA. "POSITRONIUM PHYSICS BEYOND THE STANDARD MODEL." Modern Physics Letters A 17, no. 26 (August 30, 2002): 1713–24. http://dx.doi.org/10.1142/s0217732302008162.

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Possible manifestations of new physics in rare (exotic) decays of orthopositronium (o - Ps) are briefly reviewed. It is pointed out that models with infinite additional dimension(s) of Randall–Sundrum type predict disappearance of orthopositronium into additional dimension(s). The experimental signature of this effect is the invisible decay of orthopositronium. We point out that this process may occur at a rate within two or three orders of magnitude of the present experimental upper limit. We also propose a model with a light weakly interacting boson leading to o - Ps → invisible decays at the experimentally interesting rate. We discuss this in details and stress that the existence of invisible decay of orthopositronium in vacuum could explain the o - Ps decay rate puzzle. Thus, our result enhances the existing motivation and justifies efforts for a more sensitive search for o - Ps → invisible decay in a near future experiment.

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45

Spiesberger, H. "HERA physics beyond the standard model." Journal of Physics G: Nuclear and Particle Physics 25, no. 7 (January 1, 1999): 1281–87. http://dx.doi.org/10.1088/0954-3899/25/7/303.

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46

Culbertson, R. L. "Physics Beyond The Standard Model: Experimental." International Journal of Modern Physics A 16, supp01a (October 2001): 92–103. http://dx.doi.org/10.1142/s0217751x01006334.

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The search for physics beyond the Standard Model includes Technicolor particles, Higgs Bosons, compositeness, many variations of Supersymmetry, large extra dimensions, model-independent searches for anomalies, and other topics. This article reports a subset of these ongoing searches at the high-energy colliders, Tevatron, HERA and LEP.

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47

Stöckinger, Dominik. "and physics beyond the Standard Model." Nuclear Physics B - Proceedings Supplements 181-182 (September 2008): 32–36. http://dx.doi.org/10.1016/j.nuclphysbps.2008.09.017.

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48

London, David. "b Physics beyond the standard model." Nuclear Physics B - Proceedings Supplements 120 (June 2003): 271–76. http://dx.doi.org/10.1016/s0920-5632(03)01914-5.

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49

DEO, B. B. "THREE GENERATIONS OF SUSY STANDARD MODEL OF NAMBU–GOTO STRING." International Journal of Modern Physics A 21, no. 32 (December 30, 2006): 6575–92. http://dx.doi.org/10.1142/s0217751x06034203.

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A four-dimensional superstring have been constructed starting from a 26-dimensional bosonic string. Fermions are introduced by noting the Mandelstam's proof of equivalence of two fermions to one boson in 1+1 dimensions. The action of the superstring is invariant under SO (6) ⊗ SO (5) in the worldsheet. It has four bosonic coordinates and 44 Majorana fermions of SO (3, 1). Here the superstring action is shown to be invariant under conformal and superconformal transformations with the usual conformal and superconformal ghosts of the ten-dimensional superstrings. The massless spectrum obtained by quantizing the action, contain vector mesons which are generators of the SO (6) ⊗ SO (5). Using Wilson loops, this product group is proven to descend to Z3 ⊗ SU (3) ⊗ SU (2) ⊗ U (1) without breaking supersymmetry. Thus there are just three generations of quarks and leptons.

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50

Arkani-Hamed, Nima. "Beyond the Standard Model theory." Physica Scripta T158 (December 1, 2013): 014023. http://dx.doi.org/10.1088/0031-8949/2013/t158/014023.

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