Measurement of the differential tt̄ cross section in the boosted all-hadronic channel for the CMS experiment at the LHC at √ s = 8TeV
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Date
2017-01-27
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Johns Hopkins University
Abstract
The first measurement of the differential tt̄ cross section at using 19.7 fb −1 of all-jet events with boosted high-p T top quark jets collected by the CMS detector at √s =8 TeV is presented. A boosted top jet is one in which the subjets have merged. A
data-driven method is used to calculate the standard model background dominated by QCD multijet production. The tt̄ cross section is extracted in bins of measured leading top quark p T using a binned likelihood fit of the invariant mass distribution of
top jet candidates. The tt̄ cross section as a function of measured leading top quark pT is then unfolded to parton-level in order to facilitate comparison with theory. This is the first measurement of the differential tt̄ cross secton in the boosted regime in
the all-jet channel at √s = 8 TeV.
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Keywords
Top quark, cross section, LHC, CERN, pT, transverse momentum, boosted, jet