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

S Chatrchyan; V Khachatryan; A M Sirunyan; V Chiochia; B Kilminster; P Robmann; CMS Collaboration

doi:10.1007/JHEP07(2013)116

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

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

S Chatrchyan, V Khachatryan, A M Sirunyan, V Chiochia, B Kilminster, P Robmann and CMS Collaboration

Journal of high energy physics : JHEP, Vol.2013(7), 116

2013

DOI: 10.1007/JHEP07(2013)116

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Abstract

A search for exclusive or quasi-exclusive W+W− production by photon-photon interactions, 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 p T(μ ±e∓) > 30 GeV. Two events passing all selection requirements 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 p T distribution is studied for deviations from the standard model. No events are observed with p T > 100 GeV. Model-independent upper limits are computed and compared to predictions involving anomalous quartic gauge couplings. The limits on the parameters aW0,C/Λ2 with a dipole form factor and an energy cutoff Λcutoff = 500 GeV are of the order of 10−4.

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Details

Title: Subtitle: Study of exclusive two-photon production of W+W− in pp collisions at s√=7 TeV and constraints on anomalous quartic gauge couplings
Creators: S Chatrchyan - Yerevan State University
V Khachatryan - Alikhanyan National Laboratory
A M Sirunyan - Alikhanyan National Laboratory
V Chiochia
B Kilminster - Fermi National Accelerator Laboratory
P Robmann - University of Zurich
CMS Collaboration
Contributors: E. A Albayrak (Contributor) - University of Iowa, Physics and Astronomy
C. R Newsom (Contributor) - University of Iowa, Physics and Astronomy
Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: Journal of high energy physics : JHEP, Vol.2013(7), 116
Publisher: Springer
DOI: 10.1007/JHEP07(2013)116
ISSN: 1029-8479
eISSN: 1029-8479
Language: English
Date published: 2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984424813402771

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