Non-universal gaugino mass models under the lamppost of muon (g-2)

Chakrabortty, Joydeep; Choudhury, Arghya; Mondal, Subhadeep

doi:10.1007/jhep07(2015)038

Cited by 34 publications

(24 citation statements)

References 172 publications

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“…The diphoton excess, if its BSM origin is 1 Refs. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] on this subject appeared at the same time as this letter.confirmed, might therefore imply the existence of additional matter states with color and electric charge.A simple toy model can be constructed by adding the 750 GeV singlet scalar φ and a new vector-like fermion X to the SM. X is an SU (3) c fundamental, carries electric charge Q X , and is heavier than about 380 GeV to avoid tree-level decays of φ.…”

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confidence: 84%

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Quirky explanations for the diphoton excess

Curtin

Verhaaren

2016

Phys. Rev. D

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We propose two simple quirk models to explain the recently reported 750 GeV diphoton excesses at ATLAS and CMS. It is already well-known that a real singlet scalar φ with Yukawa couplings φXX to vector-like fermions X with mass mX > m φ /2 can easily explain the observed signal, provided X carries both SM color and electric charge. We instead consider first the possibility that the pair production of a fermion, charged under both SM gauge groups and a confining SU (3)v gauge group, is responsible. If pair produced it forms a quirky bound state, which promptly annihilates into gluons, photons, v-gluons and possibly SM fermions. This is an extremely minimal model to explain the excess, but is already in some tension with existing displaced searches, as well as dilepton and dijet resonance bounds. We therefore propose a hybrid Quirk-Scalar model, in which the fermion of the simple φXX toy model is charged under the additional SU (3)v confining gauge group. Constraints on the new heavy fermion X are then significantly relaxed. The main additional signals of this model are possible dilepton, dijet and diphoton resonances at ∼ 2 TeV or more from quirk annihilation, and the production of v-glueballs through quirk annihilation and φ decay. The glueballs can give rise to spectacular signatures, including displaced vertices and events with leptons, photons and Z-bosons. If the Quirk-Scalar model is responsible for the 750 GeV excess it should be discovered in one of these channels with 20 or 300 fbRecently, both of the major LHC collaborations announced excesses in events containing two photons, near a diphoton invariant mass of around 750 GeV. The ATLAS search [1] used 3.2 fb −1 of data at √ s = 13 TeV and reports a local (global) excess significance of 3.9σ (2.3σ). The CMS search [2] used 2.6 fb −1 and reports a local excess significance of 2.6σ. This excess has already generated considerable interest in the theory community [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] 1 . If a Beyond Standard Model (BSM) process is responsible, compatibility with LHC run 1 searches favors gluon or heavy quark initiated production. The best-fit width is around 45 GeV but a very narrow resonance is also compatible with the data. Events in the signal bins do not appear kinematically very different from the sidebands, somewhat disfavoring explanations that involve the production of additional missing transverse energy (MET), leptons, etc. This motivates interpreting the signal in the context of a minimal benchmark model, where a Standard Model (SM) singlet scalar φ with mass around 750 GeV is produced through gluon-fusion and decays to two photons gg → φ → γγ. Taking acceptance into account, the approximate cross section corresponding to the excess [4] is σ(pp → φ → γγ) ≈ (6 ± 3)fb at CMS and (10 ± 3)fb at ATLAS with √ s = 13 TeV. This excess is intriguing for several reasons. A SM-neutral scalar couples to gluons (photons) via a dimension-5 effective operator, which can be generated by loops of colored (electrically c...

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confidence: 84%

“…The diphoton excess, if its BSM origin is 1 Refs. [21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36][37][38] on this subject appeared at the same time as this letter.…”

mentioning

confidence: 99%

Quirky explanations for the diphoton excess

Curtin

Verhaaren

2016

Phys. Rev. D

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“…An alternative approach is to make no assumption concerning the RGE extrapolation to very high energies, but take a purely phenomenological approach in which the soft SUSY-breaking parameters are specified at low energies and are not required to be universal at any input scale, a class of models referred to as the phenomenological MSSM with n free parameters (pMSSMn) [37][38][39][40][41][42][43][44][45][46][47][48][49][50]. This is the framework explored in this paper.…”

Section: Introductionmentioning

confidence: 99%

The pMSSM10 after LHC run 1

et al. 2015

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We present a frequentist analysis of the parameter space of the pMSSM10, in which the following ten soft SUSY-breaking parameters are specified independently at the mean scalar top mass scale M SUSY ≡ √ mt 1 mt 2 :the gaugino masses M 1,2,3 , the first-and second-generation squark masses mq 1 = mq 2 , the third-generation squark mass mq 3 , a common slepton mass m˜ and a common trilinear mixing parameter A, as well as the Higgs mixing parameter μ, the pseudoscalar Higgs mass M A and tan β, the ratio of the two Higgs vacuum expectation values. We use the MultiNest sampling algorithm with ∼1.2 ×10 9 points to sample the pMSSM10 parameter space. A dedicated study shows that the sensitivities to strongly interacting sparticle masses of ATLAS and CMS searches for jets, leptons + / E T signals depend only weakly on many of the other pMSSM10 parameters. With the aid of the Atom and Scorpion codes, we also implement the LHC searches for electroweakly interacting sparticles and light stops, so as to confront the pMSSM10 parameter space with all relevant SUSY searches. In addition, our analysis includes Higgs mass and rate measurements using the HiggsSignals code, SUSY Higgs exclusion bounds, the measurements of BR(B s → μ + μ − ) by LHCb and CMS, other B-physics observables, electroweak precision observables, the cold dark matter density and the XENON100 and LUX searches for spin-independent dark matter scattering, assuming that the cold dark matter is mainly provided by the lightest neutralinoχ 0 1 . We show that the pMSSM10 is able to provide a supersymmetric interpretation of (g − 2) μ , unlike the CMSSM, NUHM1 and NUHM2. As a result, we find (omitting Higgs rates) that the minimum χ 2 = 20.5 with 18 degrees of freedom (d.o.f.) in the pMSSM10, corresponding to a χ 2 probability of 30.8 %, to be compared with χ 2 /d.o.f. = 32.8/24 (31.1/23) (30.3/22) in the CMSSM (NUHM1) (NUHM2). We display the one-dimensional likelihood functions for sparticle masses, and we show that they may be significantly lighter in the pMSSM10 than in the other models, e.g., the gluino may be as light as ∼1250 GeV at the 68 % CL, and squarks, stops, electroweak gauginos and sleptons may be much lighter than in the CMSSM, NUHM1 and NUHM2. We discuss the discovery potential of future LHC runs, e + e − colliders and direct detection experiments.

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“…This standard MSSM case is well known (for reviews see [40][41][42]; recent works are [43][44][45][46][47][48][49][50][51][52][53][54][55][56][57]), and it requires SUSY masses in the few-hundred GeV range in order to explain the deviation (1.1); the LHC experiments, however, start to exclude parts of the relevant parameter space [43,58]. Thus it is well motivated to ask whether SUSY can explain the deviation even if all SUSY masses are much higher, at the TeV scale.…”

Section: Jhep10(2015)026mentioning

confidence: 99%

Large muon (g − 2) with TeV-scale SUSY masses for tan β → ∞

Bach

Park

Stöckinger

et al. 2015

J. High Energ. Phys.

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Abstract:The muon anomalous magnetic moment a µ is investigated in the MSSM for tan β → ∞. This is an attractive example of radiative muon mass generation with completely different qualitative parameter dependence compared to the MSSM with the usual, finite tan β. The observed, positive difference between the experimental and Standard Model values can only be explained if there are mass splittings, such that bino contributions dominate over wino ones. The two most promising cases are characterized either by large Higgsino mass µ or by large left-handed smuon mass m L . The required mass splittings and the resulting a SUSY µ are studied in detail. It is shown that the current discrepancy in a µ can be explained even in cases where all SUSY masses are at the TeV scale. The paper also presents useful analytical formulas, approximations for limiting cases, and benchmark points.

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Non-universal gaugino mass models under the lamppost of muon (g-2)

Cited by 34 publications

References 172 publications

Quirky explanations for the diphoton excess

Quirky explanations for the diphoton excess

The pMSSM10 after LHC run 1

Large muon (g − 2) with TeV-scale SUSY masses for tan β → ∞

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