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Experimental Seminar
Towards a measurement of top quark pair production as a function of the top transverse momentum in the boosted topology
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Kavli Meeting Room - room 305 (SLAC)
Kavli Meeting Room - room 305
SLAC
Building 51
Description
The LHC has been referred to as a top quark factory, and indeed the 20 fb-1 8TeV proton-proton collisions dataset collected in the LHC Run I should contain ~5 million top pairs! An abundance of top events to analyze means we are entering an era of precision top physics. The theoretical understanding of top pair production has similarly been advancing. As of 2013, the total top pair production cross-section is known at exact next-to-next-to-leading-order (NNLO). Improved theoretical understanding and experimental measurements translate into immediate benefits to the rest of the LHC physics program. In particular, many searches for physics beyond the Standard Model include top as a main background and its modeling is one of the dominant uncertainties. Therefore, the detailed study and improved understanding of the top pair production as a function of kinematics of the tops will play an important role in increasing the sensitivity of these searches in the future.
In the first part of this talk, I will present the ATLAS top pair differential cross-section measurement using traditional reconstruction methods, where all top decay products are resolved individually. In the second part, I will review methods aimed at improving the efficiency for selecting boosted top quarks and how these methods are being used to extend the differential top cross-section as a function of top pT up to the TeV range.
In the first part of this talk, I will present the ATLAS top pair differential cross-section measurement using traditional reconstruction methods, where all top decay products are resolved individually. In the second part, I will review methods aimed at improving the efficiency for selecting boosted top quarks and how these methods are being used to extend the differential top cross-section as a function of top pT up to the TeV range.
