Abstract
Searches for supersymmetry (SUSY) are performed using a sample of hadronic events produced in 8 TeV pp collisions at the CERN LHC. The searches are based on the MT2 variable, which is a measure of the transverse momentum imbalance in an event. The data were collected with the CMS detector and correspond to an integrated luminosity of 19.5 inverse femtobarns. Two related searches are performed. The first is an inclusive search based on signal regions defined by the value of the MT2 variable, the hadronic energy in the event, the jet multiplicity, and the number of jets identified as originating from bottom quarks. The second is a search for a mass peak corresponding to a Higgs boson decaying to a bottom quark-antiquark pair, where the Higgs boson is produced as a decay product of a SUSY particle. For both searches, the principal backgrounds are evaluated with data control samples. No significant excess over the expected number of background events is observed, and exclusion limits on various SUSY models are derived.
Highlights
Background estimationThis section describes the procedures used to estimate the main backgrounds: multijet events, Z+jets events where the Z boson decays to neutrinos, and W+jets and tt +jets events where one W boson decays leptonically but the corresponding charged lepton lies outside the acceptance of the analysis, is not reconstructed, or is not isolated
A search for supersymmetry (SUSY) in hadronic final states characterized by large values √
Of unbalanced transverse momentum has been carried out using a sample of s = 8 TeV pp collisions
Summary
The use of MT2 as a search variable is discussed in our previous publication [5]. Here, we recapitulate the most salient aspects. The visible system is defined by the transverse momentum pTvis(i), transverse energy ETvis(i), and mass mvis(i) (i = 1, 2) obtained by summing the four-momenta of all detected particles in the decay chain. The momenta pTX(i) of the unseen particles, are not experimentally accessible individually Their sum, the missing transverse momentum pmTiss, is known. The minimization is performed over trial momenta of the undetected particles fulfilling the pmTiss constraint. In this analysis, all visible objects, such as jets, are clustered into two pseudojets. All visible objects, such as jets, are clustered into two pseudojets
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
