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

Abstract: A first measurement of the polarization of W bosons with large transverse momenta in pp collisions is resented. The measurement is based on 36pb?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.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hänsel S., Hoch M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Krammer M., Liko D., Mikulec I., Pernicka M., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Teischinger F., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V., Shumeiko N.,

 Fuente: Physical Review Letters, 2011, 107(2), 021802

Editorial: American Physical Society

 Fecha de publicación: 01/07/2011

Nº de páginas: 15

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.107.021802

ISSN: 0031-9007,1079-7114

Url de la publicación: https://doi.org/10.1103/PhysRevLett.107.021802

Autores/as

CHATRCHYAN, S.

JAVIER ANDRES BROCHERO CIFUENTES

SHANHUEI CHUANG

MARTA FELCINI

MARCOS FERNANDEZ GARCIA

CLARA JORDA LOPE

PATRICIA LOBELLE PARDO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO

MARIA DEL MAR SOBRON SAÑUDO