Evidence for exclusive gamma gamma -˃ W (+) W (-) production and constraints on anomalous quartic gauge couplings in pp collisions at and 8 TeV

Title
Evidence for exclusive gamma gamma -˃ W (+) W (-) production and constraints on anomalous quartic gauge couplings in pp collisions at and 8 TeV
Author
김태정
Keywords
Forward physics; Hadron-Hadron scattering (experiments)
Issue Date
2016-08
Publisher
SPRINGER
Citation
JOURNAL OF HIGH ENERGY PHYSICS, NO. 8, Page. 1-1
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.
URI
https://link.springer.com/article/10.1007%2FJHEP08%282016%29119http://repository.hanyang.ac.kr/handle/20.500.11754/76108
ISSN
1029-8479
DOI
10.1007/JHEP08(2016)119
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COLLEGE OF NATURAL SCIENCES[S](자연과학대학) > PHYSICS(물리학과) > Articles
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