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Measurement of W? and Z? production in pp collisions at s=7 TeV

Abstract: A measurement of W? and Z? production in proton?proton collisions at ?s = 7 TeV is presented. Re- sults are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 pb?1. The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy E? T > 10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle R(, ? ) > 0.7, and with an ad- ditional dilepton invariant mass requirement of M > 50 GeV for the Z? process. The following cross section times branching fraction values are found: ? (pp ? W? + X) × B(W ? ?) = 56.3 ± 5.0(stat.) ± 5.0(syst.) ± 2.3(lumi.) pb and ? (pp ? Z? + X) × B(Z ? ) = 9.4 ± 1.0(stat.) ± 0.6(syst.) ± 0.4(lumi.) pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WW? , ZZ? , and Z? ? trilinear gauge couplings at ?s = 7 TeV are set.

Authorship: 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., Kasieczka G., Kiesenhofer W., Krammer M., Liko D., Mikulec I., Pernicka M., Rohringer H., Schöfbeck R., Strauss J., Teischinger F., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.E., Mossolov V., Shumeiko N

Fuente: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 2011, 701(5), 535-555

Publisher: Elsevier

Publication date: 01/07/2011

No. of pages: 21

Publication type: Article

DOI: 10.1016/j.physletb.2011.06.034

ISSN: 0370-2693,1873-2445

Publication Url: https://doi.org/10.1016/j.physletb.2011.06.034

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