Precision measurements, dark matter direct detection and LHC Higgs searches in a constrained NMSSM

2013

We propose a simplified light higgsino-singlino scenario in the NMSSM, in which the masses of the chargino and the lightest neutralino determine the masses and couplings of all 3 lightest neutralinos. This scenario is complementary to the simplified wino-like chargino/neutralino scenario used conventionally for the interpretation of results from trilepton searches, and motivated by lower bounds on the gluino mass in the case of GUT relations between the wino and gluino masses. We present all masses and mixing angles necessary for the determination of production cross sections of the chargino and the 3 neutralinos in the form of tables in the M χ 0 1 −M χ ± 1 plane, assuming Higgs mass motivated values for tan β = 2 and λ = 0.6. We show that this scenario leads to considerable signal rates, and present constraints in this plane from recent searches for trileptons at the LHC.

Section: Jhep11(2013)108supporting

confidence: 82%

Testing the higgsino-singlino sector of the NMSSM with trileptons at the LHC

2013

“…Direct detection cross sections in the NMSSM including WMAP constraints have been studied before in [25][26][27][28][29][30][31], but not for the LSP mass range considered here. Apart from WMAP constraints, we take care of a lengthy list of experimental constraints from Bphysics (important for large tan β and/or relatively light charged and CP-odd Higgs bosons as relevant here), Υ-physics and LEP-constraints on neutralino production.…”

Section: Jhep09(2010)085mentioning

confidence: 99%

Light dark matter in the NMSSM: upper bounds on direct detection cross sections

Das

2010

In the Next-to-Minimal Supersymmetric Standard Model, a bino-like LSP can be as light as a few GeV and satisfy WMAP constraints on the dark matter relic density in the presence of a light CP-odd Higgs scalar. We study upper bounds on the direct detection cross sections for such a light LSP in the mass range 2 − 20 GeV in the NMSSM, respecting all constraints from B-physics and LEP. The OPAL constraints on e + e − → χ 0 1 χ 0 i (i > 1) play an important rôle and are discussed in some detail. The resulting upper bounds on the spin-independent and spin-dependent nucleon cross sections are ∼ 10 −42 cm 2 and ∼ 4 × 10 −40 cm 2 , respectively. Hence the upper bound on the spin-independent cross section is below the DAMA and CoGeNT regions, but could be compatible with the two events observed by CDMS-II.

“…Note that, in contrast to the MSSM, the limit m 0 → 0 is always possible for all M 1/2 : in the MSSM this region is limited by the appearance of a stau LSP. In the NMSSM a singlino-like LSP can always be lighter than the lightest stau, and its relic density can be reduced to the WMAP/Planck JHEP08(2014)046 window through singlino-stau coannihilation as in the fully constrained NMSSM [62,63] or through narrow resonances implying specific NMSSM light Higgs states [34,[67][68][69]. (The combined constraints from the Higgs sector and the nature of the LSP lead to discontinuities in the allowed parameter space for small m 0 .)…”

Section: Jhep08(2014)046mentioning

confidence: 99%

“…The LSP (the lightest neutralino χ 0 1 ) can have a dominant singlino component and still be an acceptable candidate for dark matter. Its relic density can be reduced to fit in the WMAP/Planck window, amongst others, via the exchange of NMSSM-specific CP-even or CP-odd Higgs scalars in the s-channel [34,[67][68][69], whereas its direct detection cross section can be very small.…”

Section: Properties Of Dark Mattermentioning

confidence: 99%

The semi-constrained NMSSM satisfying bounds from the LHC, LUX and Planck

Hugonie

2014

Abstract:We study the parameter space of the semi-constrained NMSSM, compatible with constraints on the Standard Model like Higgs mass and signal rates, constraints from searches for squarks and gluinos, a dark matter relic density compatible with bounds from WMAP/Planck, and direct detection cross sections compatible with constraints from LUX. We consider the region in parameter space with an additional lighter Higgs boson in the 60-120 GeV mass range. It is detectable in the diphoton mode or in decays into a pair of lighter CP-odd Higgs bosons. This region in parameter space allows for a fine-tuning as low as about 100, and dominantly singlino like dark matter with a mass down to 1 GeV, but possibly a very small direct detection cross section.