Varying the universality of supersymmetry-breaking contributions to MSSM Higgs boson masses

Ellis, Jonathan Richard; Olive, Keith A.; Sandick, Pearl

doi:10.1103/physrevd.78.075012

Cited by 66 publications

(31 citation statements)

References 87 publications

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“…The dark matter phenomenology of NUHM models has been studied by several authors [39][40][41][42][43][44]. The LSP is a neutralino in large regions of the parameter space and further, it can admit large Higgsino fractions in its composition unlike in mSUGRA.…”

Section: Co-annihilation With Flavor Violationmentioning

confidence: 99%

Flavored co-annihilations

Chowdhury

Garani

Vempati

2012

J. High Energ. Phys.

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Neutralino dark matter in supersymmetric models is revisited in the presence of flavor violation in the soft supersymmetry breaking sector. We focus on flavor violation in the sleptonic sector and study the implications for the co-annihilation regions. Flavor violation is introduced by a singleμ R −τ R insertion in the slepton mass matrix. Limits on this insertion from BR(τ → µ + γ) are weak in some regions of the parameter space where cancellations happen within the amplitudes. We look for overlaps in parameter space where both the co-annihilation condition as well as the cancellations within the amplitudes occur. In mSUGRA, such overlap regions are not existent, whereas they are present in models with non-universal Higgs boundary conditions (NUHM). The effect of flavor violation is two fold: (a) it shifts the co-annihilation regions towards lighter neutralino masses (b) the co-annihilation cross sections would be modified with the inclusion of flavor violating diagrams which can contribute significantly. Even if flavor violation is within the presently allowed limits, this is sufficient to modify the thermally averaged cross-sections by about (10-15)% in mSUGRA and (20-30)% in NUHM, depending on the parameter space. In the overlap regions, the flavor violating cross sections become comparable and in some cases even dominant to the flavor conserving ones. A comparative study of the channels is presented for mSUGRA and NUHM cases.

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Section: Co-annihilation With Flavor Violationmentioning

confidence: 99%

Flavored co-annihilations

Chowdhury

Garani

Vempati

2012

J. High Energ. Phys.

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“…Examples of such models include the constrained MSSM (CMSSM) [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30], in which the soft SUSY-breaking mass parameters m 0 and m 1/2 are assumed to be universal at the GUT scale, as are the trilinear parameters A 0 . Other examples include models that relax the universality assumptions for the soft SUSY-breaking contributions to the Higgs masses, the NUHM1 [31][32][33][34] and NUHM2 [35,36] (see also, e.g., Ref. [30]), but retain universality for the slepton, squark and gaugino masses.…”

Section: Introductionmentioning

confidence: 99%

The pMSSM10 after LHC run 1

et al. 2015

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We present a frequentist analysis of the parameter space of the pMSSM10, in which the following ten soft SUSY-breaking parameters are specified independently at the mean scalar top mass scale M SUSY ≡ √ mt 1 mt 2 :the gaugino masses M 1,2,3 , the first-and second-generation squark masses mq 1 = mq 2 , the third-generation squark mass mq 3 , a common slepton mass m˜ and a common trilinear mixing parameter A, as well as the Higgs mixing parameter μ, the pseudoscalar Higgs mass M A and tan β, the ratio of the two Higgs vacuum expectation values. We use the MultiNest sampling algorithm with ∼1.2 ×10 9 points to sample the pMSSM10 parameter space. A dedicated study shows that the sensitivities to strongly interacting sparticle masses of ATLAS and CMS searches for jets, leptons + / E T signals depend only weakly on many of the other pMSSM10 parameters. With the aid of the Atom and Scorpion codes, we also implement the LHC searches for electroweakly interacting sparticles and light stops, so as to confront the pMSSM10 parameter space with all relevant SUSY searches. In addition, our analysis includes Higgs mass and rate measurements using the HiggsSignals code, SUSY Higgs exclusion bounds, the measurements of BR(B s → μ + μ − ) by LHCb and CMS, other B-physics observables, electroweak precision observables, the cold dark matter density and the XENON100 and LUX searches for spin-independent dark matter scattering, assuming that the cold dark matter is mainly provided by the lightest neutralinoχ 0 1 . We show that the pMSSM10 is able to provide a supersymmetric interpretation of (g − 2) μ , unlike the CMSSM, NUHM1 and NUHM2. As a result, we find (omitting Higgs rates) that the minimum χ 2 = 20.5 with 18 degrees of freedom (d.o.f.) in the pMSSM10, corresponding to a χ 2 probability of 30.8 %, to be compared with χ 2 /d.o.f. = 32.8/24 (31.1/23) (30.3/22) in the CMSSM (NUHM1) (NUHM2). We display the one-dimensional likelihood functions for sparticle masses, and we show that they may be significantly lighter in the pMSSM10 than in the other models, e.g., the gluino may be as light as ∼1250 GeV at the 68 % CL, and squarks, stops, electroweak gauginos and sleptons may be much lighter than in the CMSSM, NUHM1 and NUHM2. We discuss the discovery potential of future LHC runs, e + e − colliders and direct detection experiments.

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“…One option that has often been studied is to allow one or both of the soft supersymmetrybreaking contributions to Higgs scalar masses to be independent of the common sfermion mass, m 0 (the NUHM1,2) [17][18][19][20]. These offer some extra possibilities for accommodating the mass of the Higgs boson and the absence (so far) of supersymmetric particles at the LHC while yielding the appropriate relic cold dark matter density.…”

Section: Introductionmentioning

confidence: 99%

The Higgs mass beyond the CMSSM

et al. 2013

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The apparent discovery of a Higgs boson with mass ∼ 125 GeV has had a significant impact on the constrained minimal supersymmetric extension of the Standard Model in which the scalar masses, gaugino masses and tri-linear A-terms are assumed to be universal at the GUT scale (the CMSSM). Much of the low-mass parameter space in the CMSSM has been excluded by supersymmetric particle searches at the LHC as well as by the Higgs mass measurement and the emergent signal for B s → µ + µ − . Here, we consider the impact of these recent LHC results on several variants of the CMSSM with a primary focus on obtaining a Higgs mass of ∼ 125 GeV. In particular, we consider the one-and two-parameter extensions of the CMSSM with one or both of the Higgs masses set independently of the common sfermion mass, m 0 (the NUHM1,2). We also consider the oneparameter extension of the CMSSM in which the input universality scale M in is below the GUT scale (the sub-GUT CMSSM). We find that when M in < M GU T large regions of parameter space open up where the relic density of neutralinos can successfully account for dark matter with a Higgs boson mass ∼ 125 GeV. In some of these regions essential roles are played by coannihilation processes that are usually less important in the CMSSM with M in = M GU T . Finally, we reconsider mSUGRA models with sub-GUT universality, which have the same number of parameters as the CMSSM. Here too, we find phenomenologically viable regions of parameter space, which are essentially nonexistent in GUT-scale mSUGRA models. Interestingly, we find that the preferred range of the A-term straddles that predicted by the simplest Polonyi model.

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Varying the universality of supersymmetry-breaking contributions to MSSM Higgs boson masses

Cited by 66 publications

References 87 publications

Flavored co-annihilations

Flavored co-annihilations

The pMSSM10 after LHC run 1

The Higgs mass beyond the CMSSM

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