Measurement of the production of a W boson in association with a charm quark in pp collisions at √s = 7 TeV with the ATLAS detector

Allbrooke, B M M, Asquith, L, Cerri, A, Chavez Barajas, C A, De Santo, A, Grout, Z J, Santoyo Castillo, I, Salvatore, F, Suruliz, K, Sutton, M R, Vivarelli, I and The ATLAS Collaboration, (2014) Measurement of the production of a W boson in association with a charm quark in pp collisions at √s = 7 TeV with the ATLAS detector. Journal of High Energy Physics, 2014 (5). a68. ISSN 1029-8479

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Abstract

The production of a W boson in association with a single charm quark is studied using 4.6 fb−1 of pp collision data at s√ = 7 TeV collected with the ATLAS detector at the Large Hadron Collider. In events in which a W boson decays to an electron or muon, the charm quark is tagged either by its semileptonic decay to a muon or by the presence of a charmed meson. The integrated and differential cross sections as a function of the pseudorapidity of the lepton from the W-boson decay are measured. Results are compared to the predictions of next-to-leading-order QCD calculations obtained from various parton distribution function parameterisations. The ratio of the strange-to-down sea-quark distributions is determined to be 0.96+0.26−0.30 at Q 2 = 1.9 GeV2, which supports the hypothesis of an SU(3)-symmetric composition of the light-quark sea. Additionally, the cross-section ratio σ(W + +c¯¯)/σ(W − + c) is compared to the predictions obtained using parton distribution function parameterisations with different assumptions about the s−s¯¯¯ quark asymmetry.

Item Type: Article
Additional Information: Part of the ATLAS collaboration
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Depositing User: Samuel Appleton
Date Deposited: 17 Jul 2015 09:25
Last Modified: 06 May 2017 17:08
URI: http://sro.sussex.ac.uk/id/eprint/55405

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Project NameSussex Project NumberFunderFunder Ref
Consolidated GrantG0927STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/K001329/1