Search for supersymmetry with photons inppcollisions ats=8  TeV

Abstract

Two searches for physics beyond the standard model in events containing photons are presented. The data sample used corresponds to an integrated luminosity of 19.7 fb −1 of proton-proton collisions at ffiffi ffi s p ¼ 8 TeV, collected with the CMS experiment at the CERN LHC. The analyses pursue different inclusive search strategies. One analysis requires at least one photon, at least two jets, and a large amount of transverse momentum imbalance, while the other selects events with at least two photons and at least one jet, and uses the razor variables to search for signal events. The background expected from standard model processes is evaluated mainly from data. The results are interpreted in the context of general gaugemediated supersymmetry, with the next-to-lightest supersymmetric particle either a bino-or wino-like neutralino, and within simplified model scenarios. Upper limits at the 95% confidence level are obtained for cross sections as functions of the masses of the intermediate supersymmetric particles.

QCD corrections to W + W − production through gluon fusion

“…The production of electroweak di-bosons, pp → V V , is amongst the most important processes studied at the LHC. The Higgs decay mode H → V V will be central to precision measurements of the Higgs quantum numbers and couplings during Run II [1][2][3][4][5][6][7][8]. This requires extremely good control over the large pp → V V background, including in the Higgs off-shell region [9], which can be exploited to constrain HV V couplings [10] or the Higgs width [11][12][13].…”

“…However, this picture is somewhat misleading, since we have not included the NNLO QCD corrections to the qq channel in the theory predictions in Eq. (6). While these corrections are unknown in the fiducial region, it is perhaps interesting to see what happens if one estimates them by re-scaling NNLO QCD corrections to the inclusive cross section by the ratio of fiducial and inclusive cross sections.…”

Experimental status of supersymmetry after the LHC Run-I

“…The results obtained in the GGM are shown in Fig. 14(b), and are compared to the sensitivity of the discussed analysis [125] on simplified models of gluino-pair production. Two different simplified scenarios are considered.…”

Revisiting R-invariant direct gauge mediation

“…To date, searches for gluino pair production at the ATLAS and the CMS experiments have put severe lower limits on the gluino mass at around 1.4 TeV at 95% CL. The limits are applicable for cases where the bino either is stable [33,34] or decays into a photon and a gravitino inside the detectors as the next-to-the lightest superparticle (NLSP) [35,36]. To satisfy this constraint, we infer that…”