Measurement of the polarization of w bosons with large transverse momenta in W+jets events at the LHC

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URI: https://hdl.handle.net/10902/28416
ISSN: 0031-9007
ISSN: 1079-7114
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Autoría
Chatrchyan, S.; Brochero Cifuentes, Javier AndrésAutoridad Unican; Cabrillo Bartolomé, José IbanAutoridad Unican; Calderón Tazón, AliciaAutoridad Unican; Chuang, S. H.; Duarte Campderros, JorgeAutoridad Unican; Felcini, Marta; Fernández García, MarcosAutoridad Unican; Gómez Gramuglio, GervasioAutoridad Unican; González Sánchez, Francisco JavierAutoridad Unican; Jordá Lope, Clara; Lobelle Pardo, Patricia; López Virto, María Amparo; Marco de Lucas, JesúsAutoridad Unican; Marco de Lucas, Rafael José; Martínez Rivero, Celso; Matorras Weinig, FranciscoAutoridad Unican; Muñoz Sánchez, Francisca Javiela; Piedra Gómez, JonatanAutoridad Unican; [et al.]
Fecha
2011-07
Derechos
Atribución 3.0 España. ©2011 CERN, for the CMS Collaboration. Published by American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.
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Physical Review Letters, 2011, 107(2), 021802
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American Physical Society
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Resumen/Abstract
A first measurement of the polarization of W bosons with large transverse momenta in pp collisions is presented. The measurement is based on 36  pb−1 of data recorded at √s=7 TeV by the CMS detector at the LHC. The left-handed, right-handed, and longitudinal polarization fractions (fL, fR, and f0, respectively) of W bosons with transverse momenta larger than 50 GeV are determined by using decays to both electrons and muons. The muon final state yields the most precise measurement: (fL−fR)−=0.240±0.036(stat)±0.031(syst) and f−0=0.183±0.087(stat)±0.123(syst) for negatively charged W bosons and (fL−fR)+=0.310±0.036(stat)±0.017(syst) and f+0=0.171±0.085(stat)±0.099(syst) for positively charged W bosons. This establishes, for the first time, that W bosons produced in pp collisions with large transverse momenta are predominantly left-handed, as expected in the standard model.
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Atribución 3.0 España. ©2011 CERN, for the CMS Collaboration. Published by American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.Excepto si se señala otra cosa, la licencia del ítem se describe como Atribución 3.0 España. ©2011 CERN, for the CMS Collaboration. Published by American Physical Society under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.