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Abstract: The first measurement of the inclusive cross section for top quark pairs (tt) produced in association with two additional charm jets is presented. The analysis uses the dileptonic final states of ttevents produced in proton-proton collisions at a centre-of-mass energy of 13TeV. The data correspond to an integrated luminosity of 41.5fb?1, recorded by the CMS experiment at the LHC. Anew charm jet identification algorithm provides input to a neural network that is trained to distinguish among ttevents with two additional charm (ttcc), bottom (ttbb), and light-flavour or gluon (ttLL) jets. By means of a template fitting procedure, the inclusive ttcc, ttbb, and ttLLcross sections are simultaneously measured, together with their ratios to the inclusive tt+ two jets cross section. This provides measurements of the ttccand ttbbcross sections of 10.1 ±1.2(stat)±1.4(syst)pband 4.54 ±0.35(stat)±0.56(syst)pb, respectively, in the full phase space. The results are compared and found to be consistent with predictions from two different matrix element generators with next-to-leading order accuracy in quantum chromodynamics, interfaced with a parton shower simulation.
Fuente: Physics Letters B, Volume 820, 10 September 2021, 136565
Editorial: Elsevier
Fecha de publicación: 10/09/2021
Nº de páginas: 30
Tipo de publicación: Artículo de Revista
DOI: 10.1016/j.physletb.2021.136565
ISSN: 0370-2693,1873-2445
Url de la publicación: https://doi.org/10.1016/j.physletb.2021.136565
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SIRUNYAN, A.M.
JAVIER ANDRES BROCHERO CIFUENTES
JOSE IBAN CABRILLO BARTOLOME
ALICIA CALDERON TAZON
BARBARA CHAZIN QUERO
JORGE DUARTE CAMPDERROS
MARCOS FERNANDEZ GARCIA
CELIA FERNANDEZ MADRAZO
PEDRO JOSE FERNANDEZ MANTECA
ANDREA GARCIA ALONSO
GERVASIO GOMEZ GRAMUGLIO
CELSO MARTINEZ RIVERO
PABLO MARTINEZ RUIZ DEL ARBOL
FRANCISCO MATORRAS WEINIG
JONATAN PIEDRA GOMEZ
CEDRIC GERALD PRIEELS
FRANCESCA SHUN-NING ANNAROSA RICCI-TAM
MARIA TERESA RODRIGO ANORO
ALBERTO RUIZ JIMENO
LUCA SCODELLARO
NICOLO TREVISANI
IVAN VILA ALVAREZ
JESUS MANUEL VIZAN GARCIA
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