First measurement of the cross section for top quark pair production with additional charm jets using dileptonic final states in pp collisions at root s=13 TeV

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 t...

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Detalhes bibliográficos
Autores: Sirunyan, A.M., Brochero Cifuentes, Javier Andrés|||0000-0003-2093-7856, Cabrillo Bartolomé, José Iban|||0000-0002-0367-4022, Calderón Tazón, Alicia|||0000-0002-7205-2040, Chazin Quero, Bárbara, Duarte Campderros, Jorge|||0000-0003-0687-5214, Fernández García, Marcos|||0000-0002-4824-1087, Fernández Madrazo, Celia|||0000-0001-9748-4336, Fernández Manteca, Pedro José|||0000-0003-2566-7496, García Alonso, Andrea, Gómez Gramuglio, Gervasio|||0000-0002-1077-6553, Martínez Rivero, Celso, Martínez Ruiz del Árbol, Pablo|||0000-0002-7737-5121, Matorras Weinig, Francisco|||0000-0003-4295-5668, Piedra Gómez, Jonatan|||0000-0002-9157-1700, Prieëls, Cedric, Ricci-Tam, Francesca Shun-Ning Annarosa, Rodrigo Anoro, Teresa, Ruiz Jimeno, Alberto|||0000-0002-3639-0368, Scodellaro, Luca|||0000-0002-4974-8330, Trevisani, Nicolo, Vila Álvarez, Iván |||0000-0002-6797-7209, Vizán García, Jesús Manuel|||0000-0002-6823-8854
Formato: artículo
Fecha de publicación:2021
País:España
Recursos:Universidad de Cantabria (UC)
Repositorio:UCrea Repositorio Abierto de la Universidad de Cantabria
Idioma:inglés
OAI Identifier:oai:repositorio.unican.es:10902/24646
Acesso em linha:http://hdl.handle.net/10902/24646
Access Level:acceso abierto
Palavra-chave:CMS
Top quark
Dilepton
Charm quark
Charm-tagging
Heavy-flavour
Descrição
Resumo: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.

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