Resurrecting light stops after the 125 GeV Higgs in the baryon number violating CMSSM

Chamoun, N.; Dreiner, Herbert K.; Staub, Florian; Stefaniak, Tim

doi:10.1007/jhep08(2014)142

Cited by 10 publications

(11 citation statements)

References 152 publications

(166 reference statements)

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“…This correspondence is valid up to indirect effects originating from RPV induced loop corrections to thẽ t mass[56]. These effects remain, however, negligibly small in the λ ′′ 33i range we consider.…”

supporting

confidence: 54%

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Stashing the stops in multijet events at the LHC

2017

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While the presence of a light stop is increasingly disfavored by the experimental limits set on R-parity conserving scenarios, the naturalness of supersymmetry could still be safely concealed in the more challenging final states predicted by the existence of non-null R-parity violating couplings. Although R-parity violating signatures are extensively looked for at the Large Hadron Collider, these searches always assume 100% branching ratios for the direct decays of supersymmetric particles into Standard Model ones. In this paper we scrutinize the implications of relaxing this assumption by focusing on one motivated scenario where the lightest stop is heavier than a chargino and a neutralino. Considering a class of R-parity baryon number violating couplings, we show on general grounds that while the direct decay of the stop into Standard Model particles is dominant for large values of these couplings, smaller values give rise, instead, to the dominance of a plethora of longer decay chains and richer final states that have been so far barely analyzed at the LHC, thus weakening the impact of the present experimental stop mass limits. We characterize the case for R-parity baryon number violating couplings in the 10 −7 − 10 −1 range, in two different benchmark points scenarios within the model-independent setting of the low-energy phenomenological Minimal Supersymmetric Standard Model. We identify the different relevant experimental signatures from stop pair production and decays, estimate the corresponding proton-proton cross sections at √ s = 14 TeV and discuss signal versus background issues.

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supporting

confidence: 54%

“…(3.1) is only taken as a working assumption and could in principle be somewhat larger. Note however that values of λ ′′ 33i much larger than 10 −1 would lead to too large and negative loop corrections to the squared stop mass [56].…”

Section: B Rpv Final Statesmentioning

confidence: 99%

Stashing the stops in multijet events at the LHC

2017

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“…Table 7. (For alternative non-cMSSM models with a modified stop sector, see for example [145][146][147][148].) This is exactly the region, which typically suffers from the SM-like vacuum being only metastable, decaying to a charge-and/or colour-breaking (CCB) minimum of the potential [149][150][151].…”

Section: Vacuum Stabilitymentioning

confidence: 99%

Killing the cMSSM softly

et al. 2016

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We investigate the constrained Minimal Supersymmetric Standard Model (cMSSM) in the light of constraining experimental and observational data from precision measurements, astrophysics, direct supersymmetry searches at the LHC and measurements of the properties of the Higgs boson, by means of a global fit using the program Fittino.As in previous studies, we find rather poor agreement of the best fit point with the global data. We also investigate the stability of the electro-weak vacuum in the preferred region of parameter space around the best fit point. We find that the vacuum is metastable, with a lifetime significantly longer than the age of the Universe. For the first time in a global fit of supersymmetry, we employ a consistent methodology to evaluate the goodness-of-fit of the cMSSM in a frequentist approach by deriving p values from large sets of toy experiments. We analyse analytically and quantitatively the impact of the choice of the observable set on the p value, and in particular its dilution when confronting the model with a large number of barely constraining measurements. Finally, a

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“…Regarding the precision electroweak data, the largest effect of the stops and sbottoms is to provide a new one-loop contribution to the ρ parameter [101][102][103][104]: In the field space of { H u ≈ h, t L , t R }, we study the (meta)stability conditions for our electroweak vacuum characterized by h / √ 2 = v = 174 GeV and vanishing stop vevs [106][107][108][109][110][111][112][113][114][115][116][117][118][119][120][121][122][123][124]. The tree-level potential that we use is (in terms of real scalar fields with 1/ √ 2 normalizations factored out)…”

Section: B2 Electroweak Precision Datamentioning

confidence: 99%

Probing light stops with stoponium

Batell

Jung

2015

J. High Energ. Phys.

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We derive new limits on light stops from diboson resonance searches in the γγ, Zγ, ZZ, W W and hh channels from the first run of the LHC. If the two-body decays of the light stop are mildly suppressed or kinematically forbidden, stoponium bound states will form in pp collisions and subsequently decay via the pair annihilation of the constituent stops to diboson final states, yielding striking resonance signatures. Remarkably, we find that stoponium searches are highly complementary to direct collider searches and indirect probes of light stops such as Higgs coupling measurements. Using an empirical quarkonia potential model and including the first two S-wave stoponium states, we find that in the decoupling limit m t 1 130 GeV is excluded for any value of the stop mixing angle and heavy stop mass by the combination of the latest resonance searches and the indirect constraints. The γγ searches are the most complementary to the indirect constraints, probing the stop "blind spot" parameter region in which the h 0t 1t * 1 trilinear coupling is small. Interestingly, we also find that the Zγ searches give a stronger constraint, m t 1 170 GeV, if the stop is primarily left-handed. For a scenario with a bino LSP and stop NLSP, several gaps in the direct collider searches for stops can unambiguously be filled with the next run of the LHC. For a stop LSP decaying through an R-parity violating U DD coupling, the stoponium searches can fill the gap 100 GeV mt 1 200 GeV in the direct searches for couplings λ 10 −2 .

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Resurrecting light stops after the 125 GeV Higgs in the baryon number violating CMSSM

Cited by 10 publications

References 152 publications

Stashing the stops in multijet events at the LHC

Stashing the stops in multijet events at the LHC

Killing the cMSSM softly

Probing light stops with stoponium

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