A 125 GeV SM-like Higgs in the MSSM and the γγ rate

Self Cite

233

215

In models with an extended Higgs sector there exists an alignment limit, in which the lightest CP-even Higgs boson mimics the Standard Model Higgs. The alignment limit is commonly associated with the decoupling limit, where all non-standard scalars are significantly heavier than the Z boson. However, alignment can occur irrespective of the mass scale of the rest of the Higgs sector. In this work we discuss the general conditions that lead to "alignment without decoupling", therefore allowing for the existence of additional non-standard Higgs bosons at the weak scale. The values of tan β for which this happens are derived in terms of the effective Higgs quartic couplings in general twoHiggs-doublet models as well as in supersymmetric theories, including the MSSM and the NMSSM. Moreover, we study the information encoded in the variations of the SM Higgsfermion couplings to explore regions in the m A − tan β parameter space.

Section: Jhep04(2014)015mentioning

confidence: 99%

Impersonating the Standard Model Higgs boson: alignment without decoupling

Carena

Low

Shah

et al. 2014

Self Cite

233

215

“…On the other hand, extensions of the SM with vector-like leptons which couple to the Higgs, can both enhance and suppress the h → γγ decay rate, because in contrast to chiral leptons, vector-like leptons can interfere also constructively with the W contribution. Colored new matter is additionally constrained by data, because it also affects the gluon fusion production cross section of the Higgs, which in turn leads to modifications of all Higgs signal strengths [7,9,14,25,26,28,[43][44][45][46][47].…”

Section: Models With Exotic Hyperchargesmentioning

confidence: 99%

Exotic leptons: Higgs, flavor and collider phenomenology

Altmannshofer

Bauer

Carena

2014

Self Cite

We study extensions of the standard model by one generation of vector-like leptons with non-standard hypercharges, which allow for a sizable modification of the h → γγ decay rate for new lepton masses in the 300 GeV-1 TeV range. We analyze vacuum stability implications for different hypercharges. Effects in h → Zγ are typically much smaller than in h → γγ, but distinct among the considered hypercharge assignments. Nonstandard hypercharges constrain or entirely forbid possible mixing operators with standard model leptons. As a consequence, the leading contributions to the experimentally strongly constrained electric dipole moments of standard model fermions are only generated at the two loop level by the new CP violating sources of the considered setups. We derive the bounds from dipole moments, electro-weak precision observables and lepton flavor violating processes, and discuss their implications. Finally, we examine the production and decay channels of the vector-like leptons at the LHC, and find that signatures with multiple light leptons or taus are already probing interesting regions of parameter space.

“…12 Clearly, the study of the possible intersections of such lines with the best-fit regions in the space (c g ,c γ ) for any model (including NSUSY) will become much more important with further refinements in the measurement of Higgs properties. We discuss some prospects for the improvement of these fits in section 6.…”

Section: Global Fit To Higgs Signal Strengthsmentioning

confidence: 99%

NSUSY fits

Espinosa

Grojean

Sanz

et al. 2012

We perform a global fit to Higgs signal-strength data in the context of light stops in Natural SUSY. In this case, the Wilson coefficients of the higher dimensional operators mediating g g → h and h → γ γ, given by c g , c γ , are related by c g = 3 (1 + 3 α s /(2 π))c γ /8. We examine this predictive scenario in detail, combining Higgs signalstrength constraints with recent precision measurements of m W , Br(B → X s γ) constraints and direct collider bounds on weak scale SUSY, finding regions of parameter space that are consistent with all of these constraints. However it is challenging for the allowed parameter space to reproduce the observed Higgs mass value with sub-TeV stops. We discuss some of the direct stop discovery prospects and show how Higgs search data can be used to exclude light stop parameter space difficult to probe by direct collider searches. We determine the current status of such indirect exclusions and estimate their reach by the end of the 8 TeV LHC run.