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Measurement of associated production of vector bosons and top quark-antiquark pairs in pp collisions at sqrt(s) = 7 TeV

Abstract: The first measurement of vector-boson production associated with a top quark-antiquark pair in protonproton collisions at ffiffi s p ¼ 7 TeV is presented. The results are based on a data set corresponding to an integrated luminosity of 5:0 fb 1, recorded by the CMS detector at the LHC in 2011. The measurement is performed in two independent channels through a trilepton analysis of ttZ events and a same-sign dilepton analysis of ttV (V ¼ W or Z) events. In the trilepton channel a direct measurement of the ttZ cross section ttZ ¼ 0:28þ0:14 0:11 ðstatÞ þ0:06 0:03 ðsystÞ pb is obtained. In the dilepton channel a measurement of the ttV cross section yields ttV ¼ 0:43þ0:17 0:15 ðstatÞ þ0:09 0:07 ðsystÞ pb. These measurements have a significance, respectively, of 3.3 and 3.0 standard deviations from the background hypotheses and are compatible, within uncertainties, with the corresponding next-to-leading order predictions of 0:137þ0:012 0:016 and 0:306þ0:031 0:053 pb.

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., Aguilo E., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knünz V., Krammer M., Krätschmer I., Liko D., Mikulec I., Pernicka M., Rabady D., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Waltenberger W., Wulz C.E., Mossolov V., Shumeiko N., Suar

 Fuente: Physical Review Letters, 2013, 110(17),172002

Editorial: American Physical Society

 Fecha de publicación: 26/04/2013

Nº de páginas: 15

Tipo de publicación: Artículo de Revista

 DOI: 10.1103/PhysRevLett.110.172002

ISSN: 0031-9007,1079-7114

Url de la publicación: https://doi.org/10.1103/PhysRevLett.110.172002