Natural Higgs Mass in Supersymmetry from Nondecoupling Effects

In order to accommodate the observed Higgs boson mass in the CMSSM, the stops must either be very heavy or the mixing in the stop sector must be very large. Lower stop masses, possibly more accessible at the LHC, still give the correct Higgs mass only if the trilinear stop mixing parameter |A t | is in the multi-TeV range. Recently it has been shown that such large stop mixing leads to an unstable electroweak vacuum which spontaneously breaks charge or color. In this work we therefore go beyond the CMSSM and investigate the effects of including baryon number violating operators λ ŪDD on the stop and Higgs sectors. We find that for λ O(0.3) light stop masses as low as 220 GeV are consistent with the observed Higgs mass as well as flavour constraints while allowing for a stable vacuum. The light stop in this scenario is often the lightest supersymmetric particle. We furthermore discuss the importance of the one-loop corrections involving R-parity violating couplings for a valid prediction of the light stop masses.

Section: Jhep08(2014)142mentioning

confidence: 99%

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

Chamoun

Dreiner

Staub

et al. 2014

“…However, if the superpartners of singlet and triplet scalars are also integrated out at the same time, one would just regain the MSSM at low energies and no new insights could be obtained relative to what was already discussed previously. Therefore we shall consider a limit where only the scalar components of the singlet and triplet superfield are integrated out [82]. In this scenario new contributions toλ 3 in the scalar potential are generated, which are not present in the MSSM.…”

Section: Beyond the Mssmmentioning

confidence: 99%

Impersonating the Standard Model Higgs boson: alignment without decoupling

Carena

Low

Shah

et al. 2014

231

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.

“…The observation that m h grows with increasing M s might seem at first glance inconsistent with the approximate tree-level expression for the Higgs mass derived in ref. [30]. This derivation however did not include the mixing effects in the neutral scalar sector, which have a non-negligible impact on the light eigenvalues and are fully included in our numeric computation.…”

Section: Radiative Corrections To the Higgs Massmentioning

confidence: 99%

A precision study of the fine tuning in the DiracNMSSM

Kaminska

Ross

Schmidt-Hoberg

et al. 2014

Recently the DiracNMSSM has been proposed as possible solution to reduce the fine tuning in supersymmetry. We determine the degree of fine tuning needed in the DiracNMSSM with and without non-universal gaugino masses and compare it with the fine tuning in the GNMSSM. To apply reasonable cuts on the allowed parameter regions we perform a precise calculation of the Higgs mass in the DiracNMSSM. In addition, we include the limits from direct SUSY searches, dark matter abundance and direct searches. We find that both models are comparable in terms of fine tuning, with the minimal fine tuning in the GNMSSM slightly smaller.