Abstract
In this talk, the latest results from CMS on searches for new physics in final states with four W bosons and multiple b-quarks are presented using up to 20 fb 1 of data from the 8 TeV LHC run of 2012. This final state is of special importance in the context of the search for third generation squarks in gluino or sbottom cascade decays. The four W final state is reconstructed in a variety of final states ranging from zero to four leptons, and including up to eight or more jets and E miss .
Highlights
In proton-proton collisions, the production rate of events yielding four W bosons and multiple b-quarks is predicted to be very small by the Standard Model (SM), while several of the new physics models beyond the SM predict relatively large cross sections for this final state
Gluino and sbottom pair production in Supersymmetry (SUSY), for which the representative diagrams are shown in Figure 1, are the two examples that can lead to signatures with four W bosons and four or two b-quarks
We have presented the CMS searches for four-W and multiple-b-quark signatures in various final states with the LHC data collected in 2012 corresponding up to 20 fb−1 of integrated luminosity
Summary
In proton-proton collisions, the production rate of events yielding four W bosons and multiple b-quarks is predicted to be very small by the Standard Model (SM), while several of the new physics models beyond the SM predict relatively large cross sections for this final state. Based on these performance studies of the technique we estimate a systematic uncertainty of 30% for this background determination. The predicted backgrounds and observed data events in each jet, b-jet multiplicity and ETmiss are used to obtain 95% confidence level (C.L.) upper limit (UL) on the production cross section for various signal models that produce four W bosons and multiple b-quark jets in the final state. The backgrounds other than top-pair production are strongly suppressed by requiring that a number of jets are identified as having arisen from b quarks In this search, the angle between the lepton and W momentum vectors, ∆φ(W, ), and the leptonic mass scale of the event,.
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