Study of exclusive two-photon production of W+W− in pp collisions at √s = 7 TeV and constraints on anomalous quartic gauge couplings

Chatrchyan, S. and Khachatryan, V. and Sirunyan, A. M. and Tumasyan, A. and Adam, W. and Bergauer, T. and Dragicevic, M. and Erö, J. and Fabjan, C. and Friedl, M. and Frühwirth, R. and Ghete, V. M. and Hörmann, N. and Hrubec, J. and Jeitler, M. and Kiesenhofer, W. and Knünz, V. and Krammer, M. and Krätschmer, I. and Liko, D. and Mikulec, I. and Rabady, D. and Rahbaran, B. and Rohringer, C. and Rohringer, H. and Schöfbeck, R. and Strauss, J. and Taurok, A. and Treberer-Treberspurg, W. and Waltenberger, W. and Bencze, György and Hajdu, Csaba and Hidas, Pál and Horváth, Dezső and Radics, Bálint and Siklér, Ferenc and Veszprémi, Viktor and Vesztergombi, György and Zsigmond, Anna Júlia and Molnár, József and Pálinkás, József and Karancsi, János and Raics, Péter and Trócsányi, Zoltán and Ujvári, Balázs and Krajczár, Krisztián and Veres, Gábor (2013) Study of exclusive two-photon production of W+W− in pp collisions at √s = 7 TeV and constraints on anomalous quartic gauge couplings. JOURNAL OF HIGH ENERGY PHYSICS, 2013 (7). ISSN 1126-6708

Preview

Text 1305.5596v3.pdf Available under License Creative Commons Attribution. Download (930kB) | Preview

Abstract

A search for exclusive or quasi-exclusive W+W− production by photon-photon in- teractions, pp → p(∗)W+W−p(∗), at √s = 7 TeV is reported using data collected by the CMS detector with an integrated luminosity of 5.05 fb−1. Events are selected by requiring a μ±e∓ vertex with no additional associated charged tracks and dilepton transverse momentum pT(μ±e∓) > 30 GeV. Two events passing all selection re- quirements are observed in the data, compared to a standard model expectation of 2.2 ± 0.4 signal events with 0.84 ± 0.15 background. The tail of the dilepton pT dis- tribution is studied for deviations from the standard model. No events are observed with pT > 100 GeV. Model-independent upper limits are computed and compared to predictions involving anomalous quartic gauge couplings. The limits on the param- eters aW 0,C /Λ2 with a dipole form factor and an energy cutoff Λcutoff = 500 GeV are of the order of 10−4.

Actions (login required)

Edit Item