Measurement of differential cross sections for the production of top quark pairs and of additional jets in lepton plus jets events from pp collisions at root s=13 TeV
Differential and double-differential cross sections for the production of top quark pairs in proton-proton collisions at ffiffi s p ¼ 13 TeV are measured as a function of kinematic variables of the top quarks and the top quark-antiquark (t¯t) system. In addition, kinematic variables and multiplic...
| Main Authors: | , , , , , |
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| Format: | Article |
| Language: | English English |
| Published: |
American Physical Society
2018
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| Subjects: | |
| Online Access: | http://irep.iium.edu.my/70429/ http://irep.iium.edu.my/70429/ http://irep.iium.edu.my/70429/ http://irep.iium.edu.my/70429/1/70429_Measurement%20of%20differential%20cross%20sections%20for%20the%20production_article.pdf http://irep.iium.edu.my/70429/7/70429_Measurement%20of%20differential%20cross%20sections%20for%20the%20production_wos.pdf |
| Summary: | Differential and double-differential cross sections for the production of top quark pairs in proton-proton
collisions at ffiffi
s p ¼ 13 TeV are measured as a function of kinematic variables of the top quarks and the top
quark-antiquark (t¯t) system. In addition, kinematic variables and multiplicities of jets associated with the t¯t
production are measured. This analysis is based on data collected by the CMS experiment at the LHC in
2016 corresponding to an integrated luminosity of 35.8 fb−1. The measurements are performed in the
lepton þ jets decay channels with a single muon or electron and jets in the final state. The differential cross
sections are presented at the particle level, within a phase space close to the experimental acceptance, and
at the parton level in the full phase space. The results are compared to several standard model predictions
that use different methods and approximations. The kinematic variables of the top quarks and the t¯t system
are reasonably described in general, though none predict all the measured distributions. In particular, the
transverse momentum distribution of the top quarks is more steeply falling than predicted. The kinematic
distributions and multiplicities of jets are adequately modeled by certain combinations of next-to-leadingorder calculations and parton shower models. |
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