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Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC

AutorChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia; Chuang, S. H. ; Duarte Campderros, J. ; Felcini, Marta ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Jorda, C. ; Lobelle Pardo, P. ; López Virto, A. ; Marco, Rafael ; Marco, Jesús ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Sobron Sañudo, M. ; Vila, Iván ; Vilar, Rocío
Fecha de publicación2011
EditorAmerican Physical Society
CitaciónPhysical Review D 84(11): 112002 (2011)
ResumenA multivariate likelihood method to measure electroweak couplings with the Drell–Yan process at the LHC is presented. The process is described by the dilepton rapidity, invariant mass, and decay angle distributions. The decay angle ambiguity due to the unknown assignment of the scattered constituent quark and antiquark to the two protons in a collision is resolved statistically using correlations between the observables. The method is applied to a sample of dimuon events from proton-proton collisions at √s=7  TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 1.1  fb-1. From the dominant uu̅ , dd̅ →γ*/Z→μ-μ+ process, the effective weak mixing angle parameter is measured to be sin⁡2θeff=0.2287±0.0020 (stat.)±0.0025 (syst.). This result is consistent with measurements from other processes, as expected within the standard model.
Descripción23 páginas, 9 figuras, 2 tablas.-- PACS numbers: 12.15. y, 13.88.+e, 14.70.-e.-- CMS Collaboration: et al.
Versión del editorhttp://dx.doi.org/10.1103/PhysRevD.84.112002
URIhttp://hdl.handle.net/10261/52003
DOI10.1103/PhysRevD.84.112002
ISSN0556-2821
Aparece en las colecciones: (IFCA) Artículos
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