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Artículo

Measurement of differential cross sections of isolated-photon plus heavy-flavour jet production in pp collisions at s√=8 TeV using the ATLAS detector

Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B.; Alconada Verzini, María JosefinaIcon ; Alonso, FranciscoIcon ; Arduh, Francisco AnuarIcon ; Dova, Maria TeresaIcon ; Hoya, JoaquínIcon ; Monticelli, Fernando GabrielIcon ; Wahlberg, Hernan PabloIcon ; Bossio Sola, Jonathan DavidIcon ; Daneri, María FlorenciaIcon ; Devesa, Maria RobertaIcon ; Marceca, GinoIcon ; Otero y Garzon, Gustavo JavierIcon ; Piegaia, Ricardo NestorIcon ; Sacerdoti, SabrinaIcon ; Zinonos, Z.; Zinser, M.; Ziolkowski, M.; Živković, L.; Zobernig, G.; Zoccoli, A.; Zoch, K.; Nedden, M. zur; Zorbas, T. G.; Zou, R.; Zwalinski, L.; The ATLAS Collaboration
Fecha de publicación: 01/2018
Editorial: Elsevier Science
Revista: Physics Letters B
ISSN: 0370-2693
Idioma: Inglés
Tipo de recurso: Artículo publicado
Clasificación temática:
Física de Partículas y Campos

Resumen

This Letter presents the measurement of differential cross sections of isolated prompt photons produced in association with a b-jet or a c-jet. These final states provide sensitivity to the heavy-flavour content of the proton and aspects related to the modelling of heavy-flavour quarks in perturbative QCD. The measurement uses proton–proton collision data at a centreof-mass energy of 8 TeV recorded by the ATLAS detector at the LHC in 2012 corresponding to an integrated luminosity of up to 20.2 fb−1 . The differential cross sections are measured for each jet flavour with respect to the transverse energy of the leading photon in two photon pseudorapidity regions: |η γ | < 1.37 and 1.56 < |η γ | < 2.37. The measurement covers photon transverse energies 25 < E γ T < 400 GeV and 25 < E γ T < 350 GeV respectively for the two |η γ | regions. For each jet flavour, the ratio of the cross sections in the two |η γ | regions is also measured. The measurement is corrected for detector effects and compared to leading-order and next-to-leading-order perturbative QCD calculations, based on various treatments and assumptions about the heavy-flavour content of the proton. Overall, the predictions agree well with the measurement, but some deviations are observed at high photon transverse energies. The total uncertainty in the measurement ranges between 13% and 66%, while the central γ + b measurement exhibits the smallest uncertainty, ranging from 13% to 27%, which is comparable to the precision of the theoretical predictions.
Palabras clave: ATLAS , LHC , CERN , HEP
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info:eu-repo/semantics/openAccess Excepto donde se diga explícitamente, este item se publica bajo la siguiente descripción: Creative Commons Attribution-NonCommercial-ShareAlike 2.5 Unported (CC BY-NC-SA 2.5)
Identificadores
URI: http://hdl.handle.net/11336/104220
URL: https://www.sciencedirect.com/science/article/pii/S0370269317309462?via%3Dihub
DOI: http://dx.doi.org/10.1016/j.physletb.2017.11.054
Colecciones
Articulos(IFLP)
Articulos de INST.DE FISICA LA PLATA
Citación
Aaboud, M.; Aad, G.; Abbott, B.; Abdinov, O.; Abeloos, B.; et al.; Measurement of differential cross sections of isolated-photon plus heavy-flavour jet production in pp collisions at s√=8 TeV using the ATLAS detector; Elsevier Science; Physics Letters B; 776; 1-2018; 295-317
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