Fastlim: a fast LHC limit calculator

Papucci, Michele; Sakurai, Kazuki; Weiler, Andreas; Zeune, Lisa

doi:10.1140/epjc/s10052-014-3163-1

Cited by 88 publications

(95 citation statements)

References 101 publications

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“…In particular, the efficiencies of object reconstruction and the parameters associated with the momentum smearing are implemented in the form of analytical functions or numerical grids. The program has already been used in several studies [101][102][103][104], and the validation of the code can be found in [105].…”

Section: Lhc Constraints On Sparticle Massesmentioning

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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Section: Lhc Constraints On Sparticle Massesmentioning

confidence: 99%

The pMSSM10 after LHC run 1

et al. 2015

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“…Therefore the non-SM nature of the Higgs production can be revealed by looking at the boosted production. Moreover, this can make light stops [85][86][87][88][89][90][91][92][93][94][95][96][97][98] accessible which are hidden in the stealth region and challenging to extract given the similarity to the top background [99][100][101][102][103]. An outline showing this sensitivity and taking vacuum stability constraints into account has been presented in [45].…”

Section: Supersymmetrymentioning

confidence: 99%

Boosted Higgs shapes

et al. 2014

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The inclusive Higgs production rate through gluon fusion has been measured to be in agreement with the Standard Model (SM). We show that even if the inclusive Higgs production rate is very SM-like, a precise determination of the boosted Higgs transverse momentum shape offers the opportunity to see effects of natural new physics. These measurements are generically motivated by effective field theory arguments and specifically in extensions of the SM with a natural weak scale, like composite Higgs models and natural supersymmetry. We show in detail how a measurement at high transverse momentum of H → 2 + / p T via H → τ τ and H → W W * could be performed and demonstrate that it offers a compelling alternative to the tt H channel. We discuss the sensitivity to new physics in the most challenging scenario of an exactly SM-like inclusive Higgs cross section.

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“…We implement the CMS simplified model searches with ∼ 36/fb of data at 13 TeV for events with jets and / E T but no leptons [105] and for events with jets, / E T and a single lepton [106], using the Fastlim approach [133]. We use [105] …”

Section: Searches For Gluinos and Squarksmentioning

confidence: 99%

Likelihood analysis of the sub-GUT MSSM in light of LHC 13-TeV data

et al. 2018

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We describe a likelihood analysis using MasterCode of variants of the MSSM in which the soft supersymmetry-breaking parameters are assumed to have universal values at some scale M in below the supersymmetric grand unification scale M GUT , as can occur in mirage mediation and other models. In addition to M in , such 'sub-GUT' models have the 4 parameters of the CMSSM, namely a common gaugino mass m 1/2 , a common soft supersymmetrybreaking scalar mass m 0 , a common trilinear mixing parameter A and the ratio of MSSM Higgs vevs tan β, assuming that the Higgs mixing parameter μ > 0. We take into account constraints on strongly-and electroweakly-interacting sparticles from ∼ 36/fb of LHC data at 13 TeV and the LUX and 2017 PICO, XENON1T and PandaX-II searches for dark matter scattering, in addition to the previous LHC and dark matter constraints as well as full sets of flavour and electroweak constraints. We find a preference for M in ∼ 10 5 to 10 9 GeV, with M in ∼ M GUT disfavoured by χ 2 ∼ 3 due to the BR(B s,d → μ + μ − ) constraint. The lower limits on strongly-interacting sparticles are largely determined by LHC searches, and similar to those in the CMSSM. We find a preference for the LSP to be a Bino or Higgsino with mχ0 1 ∼ 1 TeV, with annihilation via heavy Higgs bosons a e-mail: j.costa15@imperial.ac.uk H/A and stop coannihilation, or chargino coannihilation, bringing the cold dark matter density into the cosmological range. We find that spin-independent dark matter scattering is likely to be within reach of the planned LUX-Zeplin and XENONnT experiments. We probe the impact of the (g − 2) μ constraint, finding similar results whether or not it is included.

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Fastlim: a fast LHC limit calculator

Cited by 88 publications

References 101 publications

The pMSSM10 after LHC run 1

The pMSSM10 after LHC run 1

Boosted Higgs shapes

Likelihood analysis of the sub-GUT MSSM in light of LHC 13-TeV data

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