Search

Nonuniversal gaugino mass models can naturally account for the dark matter relic density via the bulk annihilation process with relatively light bino LSP and right sleptons in the mass range of ~100 GeV, while accommodating the observed Higgs boson mass of ~125 GeV with TeV scale squark/gluino masses. A class of these models can also account for the observed muon g-2 anomaly via SUSY loops with wino and left sleptons in the mass range of 400-700 GeV. These models can be tested at LHC via electroweak production of charged and neutral wino pair, leading to robust trilepton and same sign dilepton signals. We investigate these signals along with the standard model background for both 8 and 13 TeV LHC runs. [ABSTRACT FROM AUTHOR]

We analyze the prospect for observing the intermediate neutral Higgs boson (h2) in its decay to two lighter Higgs bosons (h1) at the presently operating hadron colliders in the framework of the CP-violating minimal supersymmetric standard model using the PYTHIA event generator. We consider the lepton+4-jets+ET channel from associate Wh2 production, with Wh2→Wh1h1→lνlbb bb . We require two, three or four tagged b jets. We explicitly consider all relevant standard model backgrounds, treating c jets separately from light flavor and gluon jets and allowing for mistagging. We find that it is very hard to observe this signature at the Tevatron, even with 20 fb-1 of data, in the LEP-allowed region of parameter space due to the small signal efficiency, even though the background is manageable. At the LHC, a priori huge standard model backgrounds can be suppressed by applying judiciously chosen kinematical selections. After all cuts, we are left with a signal cross section of around 0.5 fb, and a signal to background ratio between 1.2 and 2.9. According to our analysis this Higgs signal should be viable at the LHC in the vicinity of present LEP exclusion once 20 to 50 fb-1 of data have been accumulated at √s=14 TeV. [ABSTRACT FROM AUTHOR]

We analyze the prospects of observing the light charge parity (CP)-even neutral Higgs bosons (h1) in their decays into b...b quarks, in the neutral and charged current production processes eh1q and νh1q at the upcoming Large Hadron Electron Collider (LHeC), with √s≈1.296  TeV. Assuming that the intermediate Higgs boson (h2) is Standard Model (SM)-like, we study the Higgs production within the framework of next-to-minimal supersymmetric Standard Model (NMSSM). We consider the constraints from dark-matter, sparticle masses, and the Higgs boson data. The signal in our analysis can be classified as three jets, with electron (missing energy) coming from the neutral (charged) current interaction. We demand that the number of b-tagged jets in the central rapidity region be greater or equal to two. The remaining jet is tagged in the forward regions. With this forward jet and two b-tagged jets in the central region, we reconstructed three jets invariant masses. Applying some lower limits on these invariant masses turns out to be an essential criterion to enhance the signal-to-background rates, with slightly different sets of kinematical selections in the two different channels. We consider almost all reducible and irreducible SM background processes. We find that the non-SM like Higgs boson, h1, would be accessible in some of the NMSSM benchmark points, at approximately the 0.4σ (2.5σ) level in the e+3j channel up to Higgs boson masses of 75 GeV, and in the ET+3j channel could be discovered with the 1.7σ (2.4σ) level up to Higgs boson masses of 88 GeV with 100 fb-1 of data in a simple cut-based (with optimization) selection. With ten times more data accumulation at the end of the LHeC run, and using optimization, one can have 5σ discovery in the electron (missing energy) channel up to 85 (more than 90) GeV. [ABSTRACT FROM AUTHOR]

We consider the possible production of the Higgs boson in association with a top-quark pair and its subsequent decay into a tau-lepton pair or a W-boson pair. This process can give rise to many signatures of the Higgs boson. These signatures can have electrons, muons, tau jets, bottom jets and/or light flavor jets. We analyze the viability of some of these signatures. We will look at those signatures where the background is minimal. In particular, we explore the viability of the signatures "isolated 4 electron/muon" and "isolated 3 electron/muon + a jet." The jet can be due to a light flavor quark/gluon, a bottom quark, or a tau lepton. Of all these signatures, we find that "isolated 3 electron/muon + a tau jet," with an extra bottom jet, can be an excellent signature of this mode of the Higgs boson production. We show that this signature may be visible within a year, once the Large Hadron Collider (LHC) restarts. Some of the other signatures would also be observable after the Large Hadron Collider accumulates sufficient luminosity. [ABSTRACT FROM AUTHOR]