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The search for supersymmetric models remains one of the main items on the BSM search program at the LHC, with EW SUSY partners still allowed with masses as low as a few hundred GeV. Over the last years, searches for the "golden channel",…

High Energy Physics - Phenomenology · Physics 2025-12-19 Emanuele Bagnaschi , Manimala Chakraborti , Sven Heinemeyer , Ipsita Saha

In the MSSM, the assumptions of a common sfermion mass parameter m_0 and a common gaugino mass parameter m_1/2, along with the requirements from radiative electroweak symmetry breaking, lead to relatively large values of the Higgs mixing…

High Energy Physics - Phenomenology · Physics 2009-10-31 Toby Falk

The new minimal supersymmetric standard model (nMSSM), a variant of the general next to minimal supersymmetric standard model (NMSSM) without $Z_3$ symmetry, features a naturally light singlino with a mass below 75 GeV. In light of the new…

High Energy Physics - Phenomenology · Physics 2016-02-17 D. Barducci , G. Bélanger , C. Hugonie , A. Pukhov

We investigate squark and gluino pair production at LHC(CMS) for the case of nonuniversal gaugino masses. Visibility of signal by an excess over SM background in $(n \geq 2)jets + E^{miss}_T + (m \geq leptons)$ events depends rather…

High Energy Physics - Phenomenology · Physics 2007-05-23 S. I. Bityukov , N. V. Krasnikov

Under the minimal SUSY standard model (MSSM), the discrepancy in the muon g-2 suggests the SUSY particles are of order 100 GeV, which is also supported by discussions on the little hierarchy problem. However, the LHC experiments have found…

High Energy Physics - Phenomenology · Physics 2013-05-06 Sho Iwamoto

We consider a minimal natural supersymmetric model based on an extra dimension with supersymmetry breaking provided by the Scherk-Schwarz mechanism. The lightest supersymmetric particle is a neutral, quasi-Dirac Higgsino and, unlike in…

High Energy Physics - Phenomenology · Physics 2019-04-24 Antonio Delgado , Adam Martin , Mariano Quiros

We present a focused study of a predictive unified model whose measurable consequences are immediately relevant to early discovery prospects of supersymmetry at the LHC. ATLAS and CMS have released their analysis with 35~pb$^{-1}$ of data…

High Energy Physics - Phenomenology · Physics 2011-07-28 Daniel Feldman , Katherine Freese , Pran Nath , Brent D. Nelson , Gregory Peim

We re-analyze the LHC bounds on light third generation squarks in Natural Supersymmetry, where the sparticles have masses inversely proportional to their leading-log contributions to the electroweak symmetry breaking scale. Higgsinos are…

High Energy Physics - Phenomenology · Physics 2013-09-04 Graham D. Kribs , Adam Martin , Arjun Menon

Supersymmetric models with Dirac instead of Majorana gaugino masses have distinct phenomenological consequences. In this paper, we investigate the electroweakino sector of the Minimal Dirac Gaugino Supersymmetric Standard Model (MDGSSM)…

High Energy Physics - Phenomenology · Physics 2020-10-14 Mark D. Goodsell , Sabine Kraml , Humberto Reyes-González , Sophie L. Williamson

We update previous frequentist analyses of the CMSSM and NUHM1 parameter spaces to include the public results of searches for supersymmetric signals using ~1 /fb of LHC data recorded by ATLAS and CMS and ~0.3/fb of data recorded by LHCb in…

We present global fits of the constrained Minimal Supersymmetric Standard Model (cMSSM) and the Non-Universal Higgs Model (NUHM), including the most recent CMS constraint on the Higgs boson mass, 5.8/fb integrated luminosity null…

High Energy Physics - Phenomenology · Physics 2014-04-28 C. Strege , G. Bertone , F. Feroz , M. Fornasa , R. Ruiz de Austri , R. Trotta

We consider the Minimal Supersymmetric Standard Model (MSSM) with varying amounts of non-universality in the soft supersymmetry-breaking contributions to the Higgs scalar masses. In addition to the constrained MSSM (CMSSM) in which these…

High Energy Physics - Phenomenology · Physics 2014-11-20 Pearl Sandick

Relatively light electroweak superparticle masses are required to satisfy the bulk annihilation region of dark matter relic density and account for the observed excess of muon g-2, while TeV scale squark and gluino masses are required to…

High Energy Physics - Phenomenology · Physics 2014-03-03 Subhendra Mohanty , Soumya Rao , D. P. Roy

The most recent CMS results from a search for supersymmetry (SUSY) with a compressed mass spectrum in leptonic final states will be presented. The search is targeting signatures with missing transverse momentum and two or three low-momentum…

High Energy Physics - Experiment · Physics 2021-11-30 Ioanna Papavergou , Emmanouil Vourliotis

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…

We investigate squark and gluino pair production at LHC (CMS) with subsequent decays into quarks, leptons and LSP in models with effective supersymmetry where third generation of squarks is relatively light while the first two generations…

High Energy Physics - Phenomenology · Physics 2007-05-23 S. I. Bityukov , N. V. Krasnikov

Without assuming that Higgs masses have the same values as other scalar masses at the input GUT scale, we combine constraints on the minimal supersymmetric extension of the Standard Model (MSSM) coming from the cold dark matter density with…

High Energy Physics - Phenomenology · Physics 2008-11-26 John Ellis , Keith A. Olive , Yudi Santoso

Most SUSY searches at the LHC are optimised for the MSSM, where gauginos are Majorana particles. By introducing Dirac gauginos, we obtain an enriched phenomenology, from which considerable differences in the LHC signatures and limits are…

High Energy Physics - Phenomenology · Physics 2019-10-29 Guillaume Chalons , Mark Goodsell , Sabine Kraml , Humberto Reyes-González , Sophie L. Williamson

We consider very constrained versions of the minimal supersymmetric extension of the Standard Model (VCMSSMs) which, in addition to constraining the scalar masses m_0 and gaugino masses m_{1/2} to be universal at some input scale, impose…

High Energy Physics - Phenomenology · Physics 2008-11-26 John Ellis , Keith A. Olive , Yudi Santoso , Vassilis C. Spanos

The searches for heavy Higgs bosons and supersymmetric (SUSY) particles at the LHC have left the minimal supersymmetric standard model (MSSM) with an unusual spectrum of SUSY particles, namely, all squarks are beyond a few TeV while the…

High Energy Physics - Phenomenology · Physics 2015-05-20 Kingman Cheung , Ran Huo , Jae Sik Lee , Yue-Lin Sming Tsai