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Статті в журналах з теми "LHC bounds"

Щоб переглянути інші типи публікацій з цієї теми, перейдіть за посиланням: LHC bounds.

Автор: Grafiati

Опубліковано: 10 грудня 2022

Оновлено: 29 січня 2023

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1

Köksal, M., та S. C. İnan. "AnomaloustqγCouplings inγpCollision at the LHC". Advances in High Energy Physics 2014 (2014): 1–11. http://dx.doi.org/10.1155/2014/935840.

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Анотація:

We have examined the constraints on the anomaloustqγ (q=u,c)couplings through the processpp→pγp→pWbXat the LHC by considering four forward detector acceptances:0.0015<ξ<0.5,0.0015<ξ<0.15,0.015<ξ<0.15, and0.1<ξ<0.5, whereξ=Eγ/EwithEγandEthe energies of the photon and of the incoming proton, respectively. The sensitivity bounds on the anomalous couplings have been obtained at the 95% confidence level in a model independent effective Lagrangian approach. We have found that the bounds on these couplings can be highly improved compared to current experimental bounds.

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2

Salvioni, Ennio, Giovanni Villadoro, and Fabio Zwirner. "MinimalZ′ models: present bounds and early LHC reach." Journal of High Energy Physics 2009, no. 11 (November 16, 2009): 068. http://dx.doi.org/10.1088/1126-6708/2009/11/068.

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3

RAKLEV, ARE R. "MASSIVE METASTABLE CHARGED (S)PARTICLES AT THE LHC." Modern Physics Letters A 24, no. 25 (August 20, 2009): 1955–69. http://dx.doi.org/10.1142/s0217732309031648.

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Анотація:

This brief review deals with recent interest in the prospects of observing a Massive Metastable Charged Particle (MMCP) at the Large Hadron Collider (LHC), and measuring its properties there. We discuss the motivation for scenarios with MMCPs in a phenomenological context, focusing on supersymmetric models that allow us to explore the expected experimental signatures of MMCPs at the LHC. We review current bounds and give estimates of the LHC reach in terms of MMCP masses.

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4

Şahin, B. "Search for the AnomaloustqγandtqHCouplings inγpCollision at the LHC". Advances in High Energy Physics 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/590397.

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We have investigated the constraints on the anomaloustqγandtqH (q=u,c)couplings through the photoproduction processespp→pγp→ptγX→pbl+νlγXandpp→pγp→ptHX→pbl+νlbb-Xat the LHC. We have obtained 95% confidence level bounds on the anomalous couplings by considering various values of detector acceptances and integrated luminosities. Improved constraints on thetqγcoupling have been obtained compared to current bounds.

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5

Askew, Andrew, Sushil Chauhan, Björn Penning, William Shepherd, and Mani Tripathi. "Searching for dark matter at hadron colliders." International Journal of Modern Physics A 29, no. 23 (September 16, 2014): 1430041. http://dx.doi.org/10.1142/s0217751x14300415.

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Анотація:

Theoretical and experimental techniques employed in dedicated searches for dark matter at hadron colliders are reviewed. Bounds from the 7 TeV and 8 TeV proton–proton collisions at the Large Hadron Collider (LHC) on dark matter interactions have been collected and the results interpreted. We review the current status of the Effective Field Theory picture of dark matter interactions with the Standard Model. Currently, LHC experiments have stronger bounds on operators leading to spin-dependent scattering than direct detection experiments, while direct detection probes are more constraining for spin-independent scattering for WIMP masses above a few GeV.

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6

Ilisie, Victor. "Bounds on neutral and charged Higgs from the LHC." Nuclear and Particle Physics Proceedings 273-275 (April 2016): 678–83. http://dx.doi.org/10.1016/j.nuclphysbps.2015.09.103.

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7

Lüst, Dieter, and Tomasz R. Taylor. "Limits on stringy signals at the LHC." Modern Physics Letters A 30, no. 15 (May 7, 2015): 1540015. http://dx.doi.org/10.1142/s0217732315400155.

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8

Okada, Yasuhiro, and Luca Panizzi. "LHC Signatures of Vector-Like Quarks." Advances in High Energy Physics 2013 (2013): 1–17. http://dx.doi.org/10.1155/2013/364936.

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Анотація:

This work provides an overview on the current status of phenomenology and searches for heavy vector-like quarks, which are predicted in many models of new physics beyond the Standard Model. Searches at Tevatron and at the LHC, here listed and shortly described, have not found any evidence for new heavy fermionic states (either chiral or vector-like) and have therefore posed strong bounds on their masses: depending on specific assumptions on the interactions and on the observed final state, vector-like quarks with masses up to roughly 400–600 GeV have been excluded by all experiments. In order to be as simple and model independent as possible, the chosen framework for the phenomenological analysis is an effective model with the addition of a vector-like quark representation (singlet, doublet, or triplet underSU(2)L) which couples through Yukawa interactions with all SM families. The relevance of different observables for the determination of bounds on mixing parameters is then discussed and a complete overview of possible two body final states for every vector-like quark is provided, including their subsequent decay into SM particles. A list and short description of phenomenological analyses present in the literature are also provided for reference purposes.

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9

Das, Siba P., Jorge F. Fraga, and Carlos Avila. "Production of a light top-squark pair in association with a light non-SM Higgs boson within the NMSSM from proton–proton collisions at s = 13 TeV and 33 TeV." International Journal of Modern Physics A 34, no. 22 (August 7, 2019): 1950125. http://dx.doi.org/10.1142/s0217751x19501252.

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Анотація:

We study the production of a light top-squark pair in association with the lightest Higgs boson [Formula: see text], as predicted by the Next-to-Minimal Supersymmetric Standard Model (NMSSM) in proton–proton collisions at center-of-mass energies of 13 TeV and 33 TeV. We scan randomly about 10 million points of the NMSSM parameter space, allowing all possible decays of the lightest top-squark and lightest Higgs boson, with no further assumptions, except for known physical constraints such as perturbative bounds, dark matter relic density consistent with recent Planck experiment measurements, Higgs mass bounds on the next to lightest Higgs boson, [Formula: see text], assuming it is consistent with LHC measurements for the Standard Model Higgs boson, LEP bounds for the chargino mass and [Formula: see text] invisible width, experimental bounds on [Formula: see text] meson rare decays and some LHC experimental bounds on SUSY particle spectra different to the particles involved in our analysis. We find that for low mass top-squark, the dominating decay mode is [Formula: see text] with [Formula: see text]. We use three benchmark points with the highest cross-sections, which naturally fall within the compressed spectra of the top-squark, and make a phenomenological analysis to determine the optimal event selection that maximizes the signal significance over backgrounds. We focus on the leptonic decays of both [Formula: see text]’s and the decay of the lightest Higgs boson into [Formula: see text]-quarks [Formula: see text]. Our results show that the high luminosity LHC will have limitations to observe the studied SUSY scenario and only a proton collider with a collision energy above 33 TeV will be able to observe this signal with more than three standard deviations over background, albeit for stop masses below 300 GeV.

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10

HESARI, HODA, and MOJTABA MOHAMMADI NAJAFABADI. "PROBING THE ANOMALOUS COUPLINGS OF THE TOP QUARK WITH GLUON AT THE LHC AND TEVATRON." Modern Physics Letters A 28, no. 37 (November 20, 2013): 1350170. http://dx.doi.org/10.1142/s0217732313501708.

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Анотація:

In this paper, we study the sensitivity of the fraction of [Formula: see text] events arising from gluon–gluon fusion to the chromoelectric and chromomagnetic dipole moments (CEDM and CMDM) as well as the total and differential [Formula: see text] cross-sections at the LHC and Tevatron. The sensitivity of measured charged asymmetry at the LHC to CEDM and CMDM is also studied. We find that at the Tevatron and the LHC, nonzero values of CMDM could suppress the [Formula: see text] production rate. It is shown that the ratio of [Formula: see text] at the Tevatron is more sensitive to CEDM and CMDM than the LHC case. The presence of CEDM always increases the contribution of gluon–gluon fusion process in top pair rate at the Tevatron and LHC. Except for a small range of CMDM, the presence of CEDM and CMDM can increase the fraction of gluon–gluon fusion at the Tevatron and LHC. The measured ratio of [Formula: see text] at the Tevatron is used to derive bounds on the chromoelectric and chromomagnetic dipole moments as well as the total and differential [Formula: see text] cross-sections at the LHC and Tevatron, and the measured charged asymmetry at the LHC. The combination of [Formula: see text] and σ LHC provides stringent limits on CMDM and CEDM.

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11

Yamamoto, Y. "Unitarity bounds on scalar dark matter effective interactions at LHC." Progress of Theoretical and Experimental Physics 2014, no. 12 (December 10, 2014): 123B03. http://dx.doi.org/10.1093/ptep/ptu169.

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12

Casas, J. A., J. R. Espinosa, and M. Quirós. "Standard model stability bounds for new physics within LHC reach." Physics Letters B 382, no. 4 (August 1996): 374–82. http://dx.doi.org/10.1016/0370-2693(96)00682-x.

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13

Patra, Sudhanwa, Farinaldo S. Queiroz, and Werner Rodejohann. "Stringent dilepton bounds on left-right models using LHC data." Physics Letters B 752 (January 2016): 186–90. http://dx.doi.org/10.1016/j.physletb.2015.11.009.

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14

Bollig, J., and S. Vogl. "Impact of bound states on non-thermal dark matter production." Journal of Cosmology and Astroparticle Physics 2022, no. 10 (October 1, 2022): 031. http://dx.doi.org/10.1088/1475-7516/2022/10/031.

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Анотація:

Abstract We explore the impact of non-perturbative effects, namely Sommerfeld enhancement and bound state formation, on the cosmological production of non-thermal dark matter. For this purpose, we focus on a class of simplified models with t-channel mediators. These naturally combine the requirements for large corrections in the early Universe, i.e. beyond the Standard Model states with long range interactions, with a sizable new physics production cross section at the LHC. We find that the dark matter yield of the superWIMP mechanism is suppressed considerably due to the non-perturbative effects under consideration in models with color-charged mediators. In models with only electrically charged mediators the impact of non-perturbative effects is less pronounced and gets eclipsed by the impact of a possible Higgs portal interaction. In both cases we find significant shifts in the cosmologically preferred parameter space of non-thermal dark matter in these models. We also revisit the implications of LHC bounds on long-lived particles associated with non-thermal dark matter and find that testing this scenario at the LHC is a bigger challenge than previously anticipated.

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15

Bezrukov, Fedor, and Mikhail Shaposhnikov. "Inflation, LHC and the Higgs boson." International Journal of Modern Physics A 30, no. 28n29 (October 20, 2015): 1545001. http://dx.doi.org/10.1142/s0217751x15450013.

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After the Higgs boson has been discovered, the Standard Model of particle physics became a confirmed theory, potentially valid up to the Planck scale and allowing to trace the evolution of the Universe from inflationary stage till the present days. We discuss the relation between the results from the LHC and the inflationary cosmology. We given an overview of the Higgs inflation, and its relation to the possible metastability of the electroweak vacuum. A short overview of the bounds on the metastability of the electroweak vacuum in the models with inflation not related to the Higgs boson is presented.

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16

ALBRECHT, JOHANNES. "BRIEF REVIEW OF THE SEARCHES FOR THE RARE DECAYS $B^0_{s}\to\mu^+\mu^-$ and $B^0\to\mu^+\mu^-$." Modern Physics Letters A 27, no. 27 (August 23, 2012): 1230028. http://dx.doi.org/10.1142/s0217732312300285.

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Анотація:

The current experimental status of the searches for the very rare decays [Formula: see text] and [Formula: see text] is discussed. These channels are highly sensitive to various extensions of the Standard Model, especially in the scalar and pseudoscalar sector. The recent, most sensitive measurements from the CDF, ATLAS, CMS and LHCb collaborations are discussed and the combined upper exclusion limit on the branching fractions determined by the LHC experiments is shown to be 4.2×10-9 for [Formula: see text] and 0.8×10-9 for [Formula: see text]. The implications of these tight bounds on a selected set of New Physics models is sketched.

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17

Ghilencea, D. M., and Hyun Min Lee. "Bounds on supersymmetric effective operators from heavy diphoton searches." Modern Physics Letters A 32, no. 13 (April 25, 2017): 1750082. http://dx.doi.org/10.1142/s0217732317500821.

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We identify the bounds on supersymmetric effective operators beyond minimal supersymmetric models (MSSM, etc.), from heavy diphoton resonance (X) negative searches at the LHC, where X is identified with the neutral CP-even (odd), H(A) or both (mass degenerate). While MSSM-like models comply with the data, a leading effective operator of d = 6 can contribute significantly to diphoton production [Formula: see text] 1 fb, well above its MSSM value and in conflict with recent data. Both the [Formula: see text] and gg production mechanisms of H and A can contribute comparably to this. We examine the dependence of the diphoton cross-section [Formula: see text] on the values of [Formula: see text], [Formula: see text] and tan [Formula: see text], under the experimental constraints from the SM-like Higgs couplings hgg and h[Formula: see text] (due to mixing) and from the [Formula: see text] and [Formula: see text] searches. These give [Formula: see text] larger than [Formula: see text] 5 TeV for [Formula: see text] in the range 0.5–1 TeV. We show how to generate the d = 6 effective operator from microscopic (renormalizable) models. This demands the presence of vector-like states beyond the MSSM spectrum (and eventually, but not necessarily a gauge singlet), of mass near [Formula: see text] and thus outside the LHC reach.

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18

Sert, Hale, Elif Cinciog̃lu, Durmuş A. Demir, and Levent Solmaz. "Tevatron Higgs mass bounds: Projecting U(1)′ models to LHC domain." Physics Letters B 692, no. 5 (September 2010): 327–35. http://dx.doi.org/10.1016/j.physletb.2010.08.007.

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19

ENGLERT, CHRISTOPH. "NON-STANDARD HIGGS AND mh≃125 GeV." Modern Physics Letters A 27, no. 34 (November 2, 2012): 1230035. http://dx.doi.org/10.1142/s0217732312300352.

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Анотація:

We review non-Standard Model Higgs signatures which are missed in standard analyses by both ATLAS and CMS and show how the strong bounds by recent measurements can be relaxed in strongly-interacting theories. We also review strategies how to measure or constrain exotic Higgs decay at the LHC and a future linear collider.

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20

Pal, Partha Pratim, and Subrata Chakraborty. "Bounds on the Higgs mass in the standard model for one-loop and two-loop effective potentials and their perturbative validity." Indonesian Journal of Physics 20, no. 4 (November 3, 2016): 75–80. http://dx.doi.org/10.5614/itb.ijp.2009.20.4.1.

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Анотація:

The purpose of this paper is to obtain the bounds on the Higgs mass in the Standard Model for one and two–loops Higgs potential, which includes the contributions of scalar, vector and fermion loops at one –loop and two-loop levels for a bound on the coupling constant λ given in the work of P. Kielanowski and S.R.Juarez W as 0.369 ≤ λ ≤ 0.613. On the basis of these studies, we obtain the upper and lower bounds on the Higgs mass as 143 GeV ≤ mH ≤ 200 GeV. These results will be very useful to LHC experiments for the detection of the Higgs particle and are matching with the results obtained by a few contemporary workers. We also find that the condition for perturbative validity given by Miller is satisfied, when the Higgs mass is calculated perturbatively from the effective potential given by the mass less φ 4 theory at one and two-loop level.

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21

Maiani, L., A. D. Polosa, and V. Riquer. "Bounds to the Higgs sector masses in minimal supersymmetry from LHC data." Physics Letters B 724, no. 4-5 (July 2013): 274–77. http://dx.doi.org/10.1016/j.physletb.2013.06.026.

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22

Choudhury, Debajyoti, and Kirtiman Ghosh. "Bounds on universal extra dimension from LHC run I and II data." Physics Letters B 763 (December 2016): 155–60. http://dx.doi.org/10.1016/j.physletb.2016.10.010.

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23

Carragher, Ethan, Daniel Murnane, Peter Stangl, Wei Su, Martin White, and Anthony G. Williams. "Minimal 4D Composite Higgs Models Under Current LHC Constraints." EPJ Web of Conferences 245 (2020): 06006. http://dx.doi.org/10.1051/epjconf/202024506006.

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Анотація:

We present preliminary results of the first convergent global fits of several minimal composite Higgs models. Our fits are performed using the differential evolution optimisation package Diver. A variety of physical constraints are taken into account, including a wide range of exclusion bounds on heavy resonance production from Run 2 of the LHC. As a by-product of the fits, we analyse the collider phenomenology of the lightest new up-type and downtype resonances in the viable regions of our models, finding some low-mass resonances that can be probed in future collider searches.

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24

Kalinowski, Jan, Tania Robens, Dorota Sokołowska, and Aleksander Filip Żarnecki. "IDM Benchmarks for the LHC and Future Colliders." Symmetry 13, no. 6 (June 2, 2021): 991. http://dx.doi.org/10.3390/sym13060991.

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Анотація:

We present cross-section expectations for various processes and collider options, for benchmark scenarios of the Inert Doublet Model, a Two Higgs Doublet Model with a dark matter candidate. The proposed scenarios are consistent with current dark matter constraints, including the most recent bounds from the XENON1T experiment and relic density, as well as with known collider and low-energy limits. These benchmarks, chosen in earlier work for studies at e+e− colliders, exhibit a variety of kinematic features that should be explored at current and future runs of the LHC. We provide cross sections for all relevant production processes at 13 TeV, 27 TeV and 100 TeV proton collider, as well as for a possible 10 TeV and 30 TeV muon collider.

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25

Cavaglià, Marco, Benjamin Harms, and Shaoqi Hou. "Bounds on large extra dimensions from the Generalized Uncertainty Principle." International Journal of Modern Physics A 32, no. 15 (May 19, 2017): 1750082. http://dx.doi.org/10.1142/s0217751x17500828.

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The Generalized Uncertainty Principle (GUP) implies the existence of a physical minimum length scale [Formula: see text]. In this scenario, black holes must have a radius larger than [Formula: see text]. They are hotter and evaporate faster than in standard Hawking thermodynamics. We study the effects of the GUP on black hole production and decay at the LHC in models with large extra dimensions. Lower bounds on the fundamental Planck scale and the minimum black hole mass at formation are determined from black hole production cross-section limits by the CMS Collaboration. The existence of a minimum length generally decreases the lower bounds on the fundamental Planck scale obtained in the absence of a minimum length.

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26

Gopalakrishna, Shrihari, and Tuhin Subhra Mukherjee. "Gauge-Singlet Vector-Like Fermion Dark Matter, LHC Diphoton Rate, and Direct Detection." Advances in High Energy Physics 2017 (2017): 1–14. http://dx.doi.org/10.1155/2017/8689270.

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Анотація:

We study a gauge-singlet vector-like fermion hidden sector dark matter model, in which the communication between the dark matter and the visible standard model sector is via the Higgs-portal scalar-Higgs mixing and also via a hidden sector scalar with loop-level couplings to two gluons and also to two hypercharge gauge bosons induced by a vector-like quark. We find that the Higgs-portal possibility is stringently constrained to be small by the recent LHC di-Higgs search limits, and the loop induced couplings are important to include. In the model parameter space, we present the dark matter relic density, the dark-matter-nucleon direct detection scattering cross section, the LHC diphoton rate from gluon-gluon fusion, and the theoretical upper bounds on the fermion-scalar couplings from perturbative unitarity.

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27

Şahin, B. "Probing CP-violating WWγ couplings in γp collision at the LHC". Modern Physics Letters A 32, № 37 (4 грудня 2017): 1750205. http://dx.doi.org/10.1142/s0217732317502054.

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Анотація:

We have studied the potential of [Formula: see text] collision at the Large Hadron Collider (LHC) to probe CP (Charge and Parity)-violating anomalous WW[Formula: see text] couplings via the process [Formula: see text]. Considering various integrated luminosities and forward detector acceptance values, we have obtained 95% confidence level (CL) bounds on the anomalous coupling parameters [Formula: see text] and [Formula: see text]. Obtained limits on the coupling parameters have been compared with the current limits.

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28

Castillo-Felisola, Oscar, Cristobal Corral, Iván Schmidt, and Alfonso R. Zerwekh. "Updated limits on extra dimensions through torsion and LHC data." Modern Physics Letters A 29, no. 16 (May 25, 2014): 1450081. http://dx.doi.org/10.1142/s0217732314500813.

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Анотація:

It is well known that the inclusion of torsion in the gravitational formalism, leads to four-fermion interactions. Although the coupling constant of this interaction is strongly suppressed in four dimensions, its value is enhanced in models with n extra dimensions. In this context, we reinterpret the recent limits established by LHC experiments to four-fermion contact interactions, to set bounds on the size of the extra dimensions. For n = 2, the limits are comparable to those in the literature, while for n ≥ 3, the volume of the extra dimensions is strongly constrained.

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29

Volkas, Raymond R. "Radiative neutrino mass generation: Models, flavour and the LHC." International Journal of Modern Physics A 32, no. 14 (May 19, 2017): 1742001. http://dx.doi.org/10.1142/s0217751x17420015.

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Анотація:

Radiative neutrino mass models and the seesaw models are viewed from the unifying framework of standard model effective operators that explicitly violate lepton number by two units [Formula: see text]. After some comments on naturalness and leptogenesis in the minimal type 1 seesaw model, a full list of minimal renormalisable models that produce mass dimension-7, [Formula: see text] operators at low energies is presented. By way of example, phenomenological bounds from Run 1 LHC and lepton flavour violation data are then placed on one of these models. A possible connection between radiative neutrino mass models and the current flavour anomalies in [Formula: see text] and [Formula: see text] transitions is then described.

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30

Accomando, Elena. "Bounds on Kaluza–Klein states from EWPT and direct searches at the LHC." Modern Physics Letters A 30, no. 15 (May 7, 2015): 1540010. http://dx.doi.org/10.1142/s0217732315400106.

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Анотація:

We review the present bounds on Kaluza–Klein (KK)-excitations of Standard Model gauge bosons, predicted by TeV size extra dimensions, which have been set by the ElectroWeak Precision Test (EWPT) and recently by the direct searches performed at the CERN Large Hadron Collider (LHC). Concerning the theoretical framework we present results for the Non-Universal Extra Dimension (NUED) model with matter localized at the boundaries and all gauge bosons propagating into the bulk and acquiring KK-excitations. We also discuss its simplified version, NUED(EW), where only the ElectroWeak SM gauge bosons are allowed to propagate in the extra dimension, and its next-to-minimal version ElectroWeak Universal Extra Dimension (UED)(EW) where SU(3) is localized on the brane while the SU(2)×U(1) particle content fully propagates into the bulk.

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31

Queiroz, Farinaldo S., Clarissa Siqueira, and José W. F. Valle. "Constraining flavor changing interactions from LHC Run-2 dilepton bounds with vector mediators." Physics Letters B 763 (December 2016): 269–74. http://dx.doi.org/10.1016/j.physletb.2016.10.057.

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32

Ghorbani, Karim, and Parsa Hossein Ghorbani. "The LHC upper bounds for pp → diboson, tt̄ cross-section on fermionic dark matter." International Journal of Modern Physics A 32, no. 22 (August 10, 2017): 1750131. http://dx.doi.org/10.1142/s0217751x17501317.

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Анотація:

The ATLAS report in August 2016 provided an upper limit for the pp[Formula: see text][Formula: see text][Formula: see text]diboson and [Formula: see text] cross-sections. We consider a pseudoscalar-mediated fermionic dark matter together with gluon and photon effective operators interacting with the pseudoscalar. Choosing the resonance mass being [Formula: see text], 750 GeV and 2 TeV, beside the relic density and the invisible Higgs decay constraints we constrain more the space of parameters with the diboson and [Formula: see text] cross-section upper bounds. We finally provide some benchmarks consistent with all the constraints. Having exploited a pseudoscalar mediator, the DM-nucleon cross-section is velocity suppressed so that the model evades easily the bounds put by the future direct detection experiments such as XENON1T.

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33

LAWRANCE, ROBERT, and MAURIZIO PIAI. "HOLOGRAPHIC TECHNI-DILATON AND LHC SEARCHES." International Journal of Modern Physics A 28, no. 17 (July 10, 2013): 1350081. http://dx.doi.org/10.1142/s0217751x13500814.

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We analyze in detail the phenomenology of a model of dynamical electroweak symmetry breaking inspired by walking technicolor, by using the techniques of the bottom-up approach to holography. The model admits a light composite scalar state, the dilaton, in the spectrum. We focus on regions of parameter space for which the mass of such dilaton is 125 GeV, and for which the bounds on the precision electroweak parameter S are satisfied. This requires that the next-to-lightest composite state is the techni-rho meson, with a mass larger than 2.3 TeV. We compute the couplings controlling the decay rates of the dilaton to two photons and to two (real or virtual) Z and W bosons. For generic choices of the parameters, we find a suppression of the decay into heavy gauge bosons, in respect to the analog decay of the standard model Higgs. We find a dramatic effect on the decay into photons, which can be both strongly suppressed or strongly enhanced, the latter case corresponding to the large-N regime of the dual theory. There is a correlation between this decay rate of the dilaton into photons and the mass splitting between the techni-rho meson and its axial-vector partner: if the decay is enhanced in respect to the standard model case, then the heavy spin-1 resonances are nearly degenerate in mass, otherwise their separation in mass is comparable to the mass scale itself.

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34

CAMPOS, S. D., and V. A. OKOROKOV. "ANALYSIS OF pp AND $\bar pp$ ELASTIC SCATTERING BASED ON HIGH ENERGY BOUNDS." International Journal of Modern Physics A 25, no. 29 (November 20, 2010): 5333–48. http://dx.doi.org/10.1142/s0217751x10050755.

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Considering the Froissart–Martin bound, Jin–Martin–Cornille bound and the optical theorem, we propose a novel parametrization for the total cross-section of proton–proton and antiproton–proton elastic scattering data. Using derivative dispersion relations we obtain the real part of the elastic scattering amplitude and thus the ρ parameter. Simultaneous fits to σtot and ρ are performed allowing very good statistical descriptions of the available data. Furthermore, predictions to σtot and ρ at energies not used in the fit procedures are presented. For σtot we obtain predictions at RHIC, LHC and future hadron collider energies.

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35

Acharya, Bobby Samir, Gordon Kane, and Eric Kuflik. "Bounds on scalar masses in theories of moduli stabilization." International Journal of Modern Physics A 29, no. 11n12 (April 25, 2014): 1450073. http://dx.doi.org/10.1142/s0217751x14500730.

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In recent years it has been realized that pre-BBN decays of moduli can be a significant source of dark matter production, giving a "nonthermal WIMP miracle" and substantially reduced fine-tuning in cosmological axion physics. We study moduli masses and sharpen the claim that moduli dominated the pre-BBN universe. We conjecture that in any string theory with stabilized moduli there will be at least one modulus field whose mass is of order (or less than) the gravitino mass. Cosmology then generically requires the gravitino mass not be less than about 30 TeV and the cosmological history of the universe is nonthermal prior to BBN. Stable LSP's produced in these decays can account for the observed dark matter if they are "wino-like." We briefly consider implications for the LHC, rare decays, and dark matter direct detection and point out that these results could prove challenging for models attempting to realize gauge mediation in string theory.

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36

LODONE, PAOLO. "SUPERSYMMETRY PHENOMENOLOGY BEYOND THE MSSM AFTER 5/fb OF LHC DATA." International Journal of Modern Physics A 27, no. 10 (April 20, 2012): 1230010. http://dx.doi.org/10.1142/s0217751x12300104.

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We briefly review the status of motivated beyond-the-MSSM phenomenology in the light of the LHC searches to date. In particular, we discuss the conceptual consequences of the exclusion bounds, of the hint for a Higgs boson at about 125 GeV, and of interpreting the excess of direct CP violation in the charm sector as a signal of New Physics. We try to go into the various topics in a compact way while providing a relatively rich list of references, with particular attention to the most recent developments.

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37

Han, Chengcheng. "Probing light bino and higgsinos at the LHC." International Journal of Modern Physics A 32, no. 33 (November 30, 2017): 1745003. http://dx.doi.org/10.1142/s0217751x17450038.

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Motivated by the naturalness, we study a simplified Minimal Supersymmetric Standard Model (MSSM) scenario where only the bino-like lightest supersymmetric particle (LSP) and higgsino-like next-lightest supersymmetric particle (NLSP) are light. We first scan the parameter space of this scenario, considering the constraints from the Higgs mass, flavor physics, electroweak precision measurements and dark matter experiments. Then in the allowed parameter space, we perform a Monte Carlo simulation for the [Formula: see text] production followed by [Formula: see text] and [Formula: see text]. By examining the presently available trilepton bounds on the wino-like chargino/neutralino, we find that only a narrow region [Formula: see text] and [Formula: see text] on the plane of [Formula: see text] can be excluded. Finally, we explore the potential of trilepton signature in probing such a scenario at 14 TeV Large Hadron Collider (LHC) and find that the region with [Formula: see text] and [Formula: see text] can be covered at [Formula: see text] level with luminosity [Formula: see text].

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38

Chaudhuri, Arnab, and Maxim Yu Khlopov. "Entropy Production Due to Electroweak Phase Transition in the Framework of Two Higgs Doublet Model." Physics 3, no. 2 (April 29, 2021): 275–89. http://dx.doi.org/10.3390/physics3020020.

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We revisit the possibility of first order electroweak phase transition (EWPT) in one of the simplest extensions of the Standard Model scalar sector, namely the two-Higgs-doublet model (2HDM). We take into account the ensuing constraints from the electroweak precision tests, Higgs signal strengths and the recent LHC bounds from direct scalar searches. By studying the vacuum transition in 2HDM, we discuss in detail the entropy released in the first order EWPT in various parameter planes of a 2HDM.

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39

Datta, Anindya, and Amitava Raychaudhuri. "Next to minimal Higgs boson: Mass bounds and search prospects at the CERN LHC." Physical Review D 57, no. 5 (March 1, 1998): 2940–48. http://dx.doi.org/10.1103/physrevd.57.2940.

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40

Das, Arindam, P. S. Bhupal Dev, and Nobuchika Okada. "Direct bounds on electroweak scale pseudo-Dirac neutrinos from s=8 TeV LHC data." Physics Letters B 735 (July 2014): 364–70. http://dx.doi.org/10.1016/j.physletb.2014.06.058.

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41

Iguro, Syuhei, Michihisa Takeuchi, and Ryoutaro Watanabe. "Testing leptoquark/EFT in $${\bar{B}} \rightarrow {D^{(*)}}l{\bar{\nu }}$$ at the LHC." European Physical Journal C 81, no. 5 (May 2021). http://dx.doi.org/10.1140/epjc/s10052-021-09125-5.

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AbstractWe investigate the current LHC bounds on New Physics (NP) that contributes to $${\bar{B}} \rightarrow {D^{(*)}}l{\bar{\nu }}$$ B ¯ → D ( ∗ ) l ν ¯ for $$l = (e,\mu ,\tau )$$ l = ( e , μ , τ ) by considering both leptoquark (LQ) models and an effective-field-theory (EFT) Hamiltonian. Experimental analyses from $$l+\text {missing}$$ l + missing searches with high $$p_T$$ p T are applied to evaluate the NP constraints with respect to the Wilson coefficients. A novel point of this work is to show difference between LQs and EFT for the applicable LHC bound. In particular, we find that the EFT description is not valid to search for LQs with the mass less than $$\lesssim 10\,\text {TeV}$$ ≲ 10 TeV at the LHC and leads to overestimated bounds. We also discuss future prospects of high luminosity LHC searches including the charge asymmetry of background and signal events. Finally, a combined summary for the flavor and LHC bounds is given, and then we see that in several NP scenarios the LHC constraints are comparable with the flavor ones.

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42

Miralles, Víctor, and Antonio Pich. "LHC bounds on colored scalars." Physical Review D 100, no. 11 (December 24, 2019). http://dx.doi.org/10.1103/physrevd.100.115042.

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43

Franceschini, Roberto, Pier Paolo Giardino, Gian F. Giudice, Paolo Lodone, and Alessandro Strumia. "LHC bounds on large extra dimensions." Journal of High Energy Physics 2011, no. 5 (May 2011). http://dx.doi.org/10.1007/jhep05(2011)092.

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44

Rajaraman, Arvind, William Shepherd, Tim M. P. Tait, and Alexander M. Wijangco. "LHC bounds on interactions of dark matter." Physical Review D 84, no. 9 (November 9, 2011). http://dx.doi.org/10.1103/physrevd.84.095013.

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45

Argyropoulos, Spyros, and Ulrich Haisch. "Benchmarking LHC searches for light 2HDM+a pseudoscalars." SciPost Physics 13, no. 1 (July 22, 2022). http://dx.doi.org/10.21468/scipostphys.13.1.007.

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Using two suitable benchmark scenarios that satisfy the experimental constraints on the total decay width of the 125 GeV Higgs boson, we determine the bounds on light CP-odd spin-0 states in the 2HDM+a model that arise from existing LHC searches. Our work represents the first thorough study that considers the parameter space with m_a \lesssimma≲ 100 GeV and should prove useful for 2HDM+a interpretations of future ATLAS, CMS and LHCb searches for pseudoscalars with masses below the electroweak scale.

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46

Flores, Marvin, Jong Soo Kim, Krzysztof Rolbiecki, and Roberto Ruiz de Austri Bazan. "Updated LHC bounds on MUED after Run 2." International Journal of Modern Physics A, January 11, 2023. http://dx.doi.org/10.1142/s0217751x23500021.

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47

Gutiérrez-Rodríguez, Alejandro, Murat Köksal, Ahmet A. Billur, and MARIA HERNANDEZ. "Prospects of measurements on the anomalous magnetic and electric dipole moments of the $\tau$-neutrino in $pp$ collisions at the LHC." SciPost Physics Proceedings, no. 1 (February 22, 2019). http://dx.doi.org/10.21468/scipostphysproc.1.044.

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In this paper the production cross-section pp\rightarrow (\gamma, Z) \to \nu_\tau \bar \nu_\tau \gamma+Xpp→(γ,Z)→ντν‾τγ+X in pppp collisions at \sqrt{s}=13, 14, 33\hspace{0.8mm}TeV is presented. Furthermore, we estimate bounds at the 95\%95% C.L. on the dipole moments of the \tauτ-neutrino using integrated luminosity of {\cal L}= 100, 500, 1000, 3000 \hspace{0.8mm}fb^{-1} collected with the ATLAS detector at the LHC and we consider systematic uncertainties of \delta_{sys} = 0\%, \, 5\%, \,10\%δsys=0%,5%,10%. We found that the current and future LHC bounds are weaker than other experiments reported in previous investigations. However, it is shown that the estimated process is a good prospect for probing the dipole moments of the \tauτ-neutrino at the LHC.

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48

Bauer, Martin, Patrick Foldenauer, Peter Reimitz, and Tilman Plehn. "Light dark matter annihilation and scattering in LHC detectors." SciPost Physics 10, no. 2 (February 5, 2021). http://dx.doi.org/10.21468/scipostphys.10.2.030.

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We systematically study models with light scalar and pseudoscalar dark matter candidates and their potential signals at the LHC. First, we derive cosmological bounds on models with the Standard Model Higgs mediator and with a new weak-scale mediator. Next, we study two processes inspired by the indirect and direct detection process topologies, now happening inside the LHC detectors. We find that LHC can observe very light dark matter over a huge mass range if it is produced in mediator decays and then scatters with the detector material to generate jets in the nuclear recoil.

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49

Zhang, Cen, and Shuang-Yong Zhou. "Positivity bounds on vector boson scattering at the LHC." Physical Review D 100, no. 9 (November 4, 2019). http://dx.doi.org/10.1103/physrevd.100.095003.

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50

Dev, P. S. Bhupal, Roberto Franceschini, and R. N. Mohapatra. "Bounds on TeV seesaw models from LHC Higgs data." Physical Review D 86, no. 9 (November 7, 2012). http://dx.doi.org/10.1103/physrevd.86.093010.

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