Light Stop Mass Limits from Higgs Rate Measurements in the MSSM: Is MSSM Electroweak Baryogenesis Still Alive After All?

Abstract

We investigate the implications of the Higgs rate measurements from Run 1 of the LHC for the mass of the light scalar top partner (stop) in the Minimal Supersymmetric Standard Model (MSSM). We focus on light stop masses, and we decouple the second, heavy stop and the gluino to the multi-TeV range in order to obtain a Higgs mass of around 125 GeV. We derive lower mass limits for the light stop within various scenarios, taking into account the effects of a possibly light scalar tau partner (stau) or chargino on the Higgs rates, of additional Higgs decays to undetectable new physics, as well as of non-decoupling of the heavy Higgs sector. Under conservative assumptions, the stop can be as light as 123 GeV. Relaxing certain theoretical and experimental constraints, such as vacuum stability and model-dependent bounds on sparticle masses from LEP, we find that the light stop mass can be as light as 116 GeV. Our indirect limits are complementary to direct limits on the light stop mass from collider searches and have important implications for electroweak baryogenesis in the MSSM as a possible explanation for the observed matter-antimatter asymmetry of the Universe.

55 pages, 16 figures, 3 tables; v2: minor changes, matches the published version in JHEP

References in corpus (24)

• Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC
• Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC
• Parton distributions for the LHC
• Combined Measurement of the Higgs Boson Mass in $pp$ Collisions at $\sqrt{s}=7$ and 8 TeV with the ATLAS and CMS Experiments
• Observation of the diphoton decay of the Higgs boson and measurement of its properties
• SusHi: A program for the calculation of Higgs production in gluon fusion and bottom-quark annihilation in the Standard Model and the MSSM
• Measurement of Higgs boson production in the diphoton decay channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• Precise predictions for the Higgs-boson decay H -> W W/Z Z -> 4 leptons
• Measurements of Higgs boson production and couplings in the four-lepton channel in $pp$ collisions at center-of-mass energies of 7 and 8 TeV with the ATLAS detector
• Search for pair-produced third-generation squarks decaying via charm quarks or in compressed supersymmetric scenarios in $pp$ collisions at $\sqrt{s}=8$TeV with the ATLAS detector
• The Baryogenesis Window in the MSSM
• Electroweak Phase Transition and Baryogenesis in the nMSSM
• MSSM Higgs Couplings to Bottom Quarks: Two-Loop Corrections
• On the Generalized Harmonic Polylogarithms of One Complex Variable
• Constraining the Natural MSSM through tunneling to color-breaking vacua at zero and non-zero temperature
• Cosmological Phase Transitions and their Properties in the NMSSM
• The Effective Theory of the Light Stop Scenario
• Closing up a light stop window in natural SUSY at LHC
• Towards precise predictions for Higgs-boson production in the MSSM
• Probing the Stop Sector of the MSSM with the Higgs Boson at the LHC
• Neutral Higgs production at proton colliders in the CP-conserving NMSSM
• Spot the stop with a b-tag
• Supersymmetric Higgs Bosons in Weak Boson Fusion
• Towards model-independent exclusion of light Stops

Cited by in corpus (12)

• Detecting gravitational waves from cosmological phase transitions with LISA: an update
• Electric Dipole Moments of the Atoms, Molecules, Nuclei and Particles
• Dynamics of Electroweak Phase Transition In Singlet-Scalar Extension of the Standard Model
• MSSM Higgs Boson Searches at the LHC: Benchmark Scenarios for Run 2 and Beyond
• The Light and Heavy Higgs Interpretation of the MSSM
• BubbleProfiler: finding the field profile and action for cosmological phase transitions
• Electroweak baryogenesis from a dark sector
• Color Breaking Baryogenesis
• Charged $B$ Mesogenesis
• The cancellation mechanism in the predictions of electric dipole moments
• Alignment without Decoupling: the Portal to Light Dark Matter in the MSSM
• Gravitational waves from patterns of electroweak symmetry breaking: an effective perspective