Search for pair-produced resonances decaying to jet pairs in proton–proton collisions at s=8 TeV

Abstract

Results are reported of a general search for pair production of heavy resonances decaying to pairs of hadronic jets in events with at least four jets. The study is based on up to 19.4 fb −1 of integrated luminosity from proton-proton collisions at a centerof-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.

R-parity violation at the LHC

“…As we see, out of the six jets up to two can be bottom quark jets and up to two can be top quarks. Most searches for these scenarios are focused on multi-jet events with different numbers of b-tags [57, [134][135][136][137][138][139][140][141][142]. Some analyses also account for leptons, which could arise from leptonic top decays [110,116,141,[143][144][145].…”

“…The cascade decay at the LHC would proceed from for example a gluino down to the on-shell sneutrino, but through a neutralino, as with the charged sleptons abovẽ [139] g 1440 λ 312g → tt m t = 800 GeV [118] 1460 λ 3b3g → tt m t = 700 GeV [118] the neutrino in Eq. (41).…”

Interpretation of 750 GeV diphoton excess at LHC in singlet extension of color-octet neutrino mass model

“…Consequently, the effective qq coupling induced by the S loop can be ignored. The direct search for pair production of S in the Zgbb (with g denoting gluon) final state by CMS has excluded m S < 625 GeV at 95 % CL [173], while the CMS search for four jets [174] and ATLAS search for four tops [175] have excluded m S 830 GeV at 95 % CL. Concerning color-octet fermions, the pair production of gluinos has been searched for at LHC in the context of simplified supersymmetric models, with their masses excluded up to 1.1-1.2 TeV at 8 TeV LHC [176,177].…”

Charged lepton flavor-violating transitions in color octet model

“…The CMS Collaboration has excluded m S < 625 GeV at 95% C.L. in direct searches for S pair production in the Z -gluon-bb final state [31], while the ATLAS search for four tops [32] and the CMS search for four jets [33] have excluded m S < 830 GeV at 95% C.L. For the octet fermions, the recent results from LHC at 13 TeV in searches for supersymmetry particles like gluinos have extended the lower bound on the colored fermions up to 1.6-1.8 TeV [34].…”