Measurement of the cross section ratio σ ttbb/σ ttjj in pp collisions at √s=8TeV

Khachatryan, Vladimir; Brochero Cifuentes, Javier Andrés; Cabrillo Bartolomé, José Iban; Calderón Tazón, Alicia; Duarte Campderros, Jorge; Fernández García, Marcos; Gómez Gramuglio, Gervasio; Graziano, Alberto; López Virto, María Amparo; Marco de Lucas, Jesús; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, Francisco; Muñoz Sánchez, Francisca Javiela; Piedra Gómez, Jonatan; Rodrigo Anoro, Teresa; Rodríguez Marrero, Ana Yaiza; Ruiz Jimeno, Alberto; Scodellaro, Luca; Vila Álvarez, Iván; Vilar Cortabitarte, Rocío

doi:10.1016/j.physletb.2015.04.060

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Measurement of the ... (765.6Kb)

Identificadores

URI: http://hdl.handle.net/10902/13951

DOI: 10.1016/j.physletb.2015.04.060

ISSN: 0370-2693

ISSN: 1873-2445

; [et al.]

Fecha

2015-06

Derechos

Publicado en

Physics Letters B, Vol. 746, Pp. 132–153, 2015

Editorial

Elsevier

Enlace a la publicación

https://doi.org/10.1016/j.physletb.2015.04.060

Resumen/Abstract

The first measurement of the cross section ratio sttbb/sttjj is presented using a data sample corresponding to an integrated luminosity of 19.6fb-1 collected in pp collisions at vs=8TeV with the CMS detector at the LHC. Events with two leptons (eor µ) and four reconstructed jets, including two identified as b quark jets, in the final state are selected. The ratio is determined for a minimum jet transverse momentum pTof both 20 and 40GeV/c. The measured ratio is 0.022 ±0.003 (stat) ±0.005 (syst) for pT>20GeV/c. The absolute cross sections sttbb and sttjj are also measured. The measured ratio for pT>40GeV/c is compatible with a theoretical quantum chromodynamics calculation at next-to-leading order.

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