Evidence for exclusive $\gamma\gamma \to W^+ W^-$ production and constraints on anomalous quartic gauge couplings in $pp$ collisions at $ \sqrt{s}=7 $ and 8 TeV - INSPIRE

DataBETA

Evidence for exclusive $\gamma\gamma \to W^+ W^-$ production and constraints on anomalous quartic gauge couplings in $pp$ collisions at $\sqrt{s}=7$ and 8 TeV

CMS

Collaboration

Apr 15, 2016

40 pages

Published in:

JHEP 08 (2016) 119

Published: Aug 22, 2016

e-Print:

1604.04464 [hep-ex]

DOI:

10.1007/JHEP08(2016)119

PDG:

{{\mathit a}_{{{0}}}}/\Lambda {}^{2}

{{\mathit a}_{{{c}}}}/\Lambda {}^{2}

{{\mathit a}_{{{n}}}}/\Lambda {}^{2}

{{\mathit \kappa}_{{{0}}}^{W}}/\Lambda {}^{2}

{{\mathit \kappa}_{{{c}}}^{W}}/\Lambda {}^{2}

{{\mathit f}}_{T,0}/\Lambda {}^{4}

{{\mathit f}}_{M,i}/\Lambda {}^{4}

{{\mathit \alpha}_{{{4}}}}

{{\mathit \alpha}_{{{5}}}}

_{S,i}/\Lambda {}^{4}

_{M,i}/\Lambda {}^{4}

_{T,i}/\Lambda {}^{4}

Report number:

CMS-FSQ-13-008,
CERN-EP-2016-073

Experiments:

CERN-LHC-CMS

View in:

reference search146 citations

Citations per year

Abstract: (Springer)

A search for exclusive or quasi-exclusive γγ → W

^{+}

W

^{−}

production, via pp → p

^{(*)}

W

^{+}

W

^{−}

p

^{(*)}

→ p

^{(*)}

μ

^{±}

e

^{∓}

p

^{(*)}

at

\sqrt{s}=8

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}

(μ

^{±}

e

^{∓}

) > 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 3.4σ over the background-only hypothesis. The observed yields and kinematic distributions are compatible with the standard model prediction for exclusive and quasi-exclusive γγ → 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.

Note:

Replaced with published version. Added the journal reference and DOI. All figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/FSQ-13-008/index.html

Forward physics
Hadron-Hadron scattering (experiments)
p p: inelastic scattering
p p: colliding beams
W: pair production
W: leptonic decay
coupling: gauge
coupling: (4gauge boson)
coupling: anomaly
transverse momentum: momentum spectrum

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