Title
|
|
|
|
Evidence for exclusive production and constraints on anomalous quartic gauge couplings in pp collisions at = 7and 8 TeV
| |
Author
|
|
|
|
| |
Institution/Organisation
|
|
|
|
CMS Collaboration
| |
Abstract
|
|
|
|
A search for exclusive or quasi-exclusive gamma gamma -> W (+) W (-) production, via pp -> p ((*)) W (+) W (-) p ((*)) -> p ((*)) mu (+/-)e(a") p ((*)) at TeV, is reported using data corresponding to an integrated luminosity of 19.7 fb(-1). Events are selected by requiring the presence of an electron-muon pair with large transverse momentum p (T)(mu (+/-)e(a")) > 30 GeV, and no associated charged particles detected from the same vertex. The 8 TeV results are combined with the previous 7 TeV results (obtained for 5.05 fb(-1) of data). In the signal region, 13 (2) events are observed over an expected background of 3.9 +/- 0.6 (0.84 +/- 0.15) events for 8 (7) TeV, resulting in a combined excess of 3.4 sigma over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive gamma gamma -> W (+) W (-) production. Upper limits on the anomalous quartic gauge coupling operators a (0,C) (W) (dimension-6) and f (M0,1,2,3) (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum. |
| |
Language
|
|
|
|
English
| |
Source (journal)
|
|
|
|
Journal of high energy physics. - Bristol
| |
Publication
|
|
|
|
Bristol
:
2016
| |
ISSN
|
|
|
|
1126-6708
1029-8479
[online]
| |
DOI
|
|
|
|
10.1007/JHEP08(2016)119
| |
Volume/pages
|
|
|
|
8
(2016)
, 47 p.
| |
Article Reference
|
|
|
|
119
| |
ISI
|
|
|
|
000382661100001
| |
Medium
|
|
|
|
E-only publicatie
| |
Full text (Publisher's DOI)
|
|
|
|
| |
Full text (open access)
|
|
|
|
| |
|