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

CMS Collaboration; Canelli, F; Chiochia, V; Kilminster, B; Robmann, P; et al (2016). Evidence for exclusive $γγ→W^{+}W^{−}$ production and constraints on anomalous quartic gauge couplings in pp collisions at $\sqrt{s}$=7 and 8 TeV. Journal of High Energy Physics, 1608:119.

## Abstract

A search for exclusive or quasi-exclusive $γγ→W^{+}W^{−}$ production, via $pp → p^{(∗)}W^{+}W^{−}p^{(∗)}$ → $p^{(∗)}μ^{±}e^{∓}p^{(∗)}$ at $\sqrt{s}$ = 8TeV, is reported using data corresponding to an integrated luminosity of 19.7fb$^{−1}$. Events are selected by requiring the pres- ence of an electron-muon pair with large transverse momentum pT(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.

## Abstract

A search for exclusive or quasi-exclusive $γγ→W^{+}W^{−}$ production, via $pp → p^{(∗)}W^{+}W^{−}p^{(∗)}$ → $p^{(∗)}μ^{±}e^{∓}p^{(∗)}$ at $\sqrt{s}$ = 8TeV, is reported using data corresponding to an integrated luminosity of 19.7fb$^{−1}$. Events are selected by requiring the pres- ence of an electron-muon pair with large transverse momentum pT(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.

## Statistics

### Altmetrics

Detailed statistics

Item Type: Journal Article, refereed, original work 07 Faculty of Science > Physics Institute 530 Physics English 2016 11 Jan 2017 10:36 11 Jan 2017 10:36 Springer 1029-8479 Publisher DOI. An embargo period may apply. https://doi.org/10.1007/JHEP08(2016)119

Preview
Content: Accepted Version
Filetype: PDF
Size: 933kB
View at publisher
Preview
Content: Published Version
Filetype: PDF
Size: 833kB
Licence:

## TrendTerms

TrendTerms displays relevant terms of the abstract of this publication and related documents on a map. The terms and their relations were extracted from ZORA using word statistics. Their timelines are taken from ZORA as well. The bubble size of a term is proportional to the number of documents where the term occurs. Red, orange, yellow and green colors are used for terms that occur in the current document; red indicates high interlinkedness of a term with other terms, orange, yellow and green decreasing interlinkedness. Blue is used for terms that have a relation with the terms in this document, but occur in other documents.
You can navigate and zoom the map. Mouse-hovering a term displays its timeline, clicking it yields the associated documents.