Nevertheless, a useful educated guess about the invisible momenta can still be obtained by optimizing a suitable invariant mass function. We consider SUSY-like events with two decay chains, each terminating in an invisible particle, whose true energy and momentum are not measured in the detector. The results are also interpreted for a collection of simplified models, in which gluinos are excluded with masses as large as 1.1 TeV, for small neutralino masses, and the first-two generation squarks, stops and sbottoms are excluded for masses up to about 800, 425 and 400 GeV, respectively. Exclusion limits are derived in the CMSSM framework with gluino masses up to 800 GeV and squark masses up to 1.35 TeV excluded at 95% confidence level, depending on the model parameters. No excess is observed in the number or shape of event yields relative to Standard Model predictions. The search is sensitive to generic supersymmetry models with minimal assumptions about the superpartner decay chains. The selected events are analyzed in the 2D razor-space of MR and R and the analysis is performed in 12 tiers of all-hadronic, single and double leptons final states in the presence and absence of b-quarks, probing the third generation sector using the event heavy- flavor content. A generalized inclusive search is subsequently presented for new heavy particle pairs produced in √s = 7 TeV proton-proton collisions at the LHC using 4.7☐.1 fb -1 of integrated luminosity from the second LHC run of 2011. The analysis produced the highest sensitivity results for SUSY to date and extended the LHC reach far beyond the previous Tevatron more » results. The variables are used in the analysis of the first proton-proton collisions dataset at CMS (35 pb -1) in a search for superpartners of the quarks and gluons, targeting indirect hints of dark matter candidates in the context of supersymmetric theoretical frameworks.
The construction and LHC phenomenology of the razor variables M R, an event-by-event indicator of the heavy particle mass scale, and R, a dimensionless variable related to the transverse momentum imbalance of events and missing transverse energy, are presented.
PRASANTH SHYAMSUNDAR PLUS
= can also be seen in opposite-sign/same flavor dilepton plus jets events when a characteristic invariant mass edge stands out against background.