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Evidence for exclusive γγ → W+ W− production and constraints on anomalous quartic gauge couplings in pp collisions at √s = 7 and 8 TeV
| File | Description | Size | Format | |
|---|---|---|---|---|
 art%3A10.1007%2FJHEP08%282016%29119.pdf | Published version | 814.29 kB | Adobe PDF | View/Open |
| Title: | Evidence for exclusive γγ → W<sup>+</sup> W<sup>−</sup> production and constraints on anomalous quartic gauge couplings in pp collisions at √s = 7 and 8 TeV |
| Authors: | The, CMSC Khachatryan, V Sirunyan, AM Tumasyan, A Adam, W Asilar, E Bergauer, T Brandstetter, J Brondolin, E Dragicevic, M Erö, J Flechl, M Friedl, M Frühwirth, R Ghete, VM Hartl, C Hörmann, N Hrubec, J Jeitler, M Knünz, V König, A Krammer, M Krätschmer, I Liko, D Matsushita, T Mikulec, I Rabady, D Rad, N Rahbaran, B Rohringer, H Schieck, J Schöfbeck, R Strauss, J Treberer-Treberspurg, W Waltenberger, W Wulz, CE Mossolov, V Shumeiko, N Suarez Gonzalez, J Alderweireldt, S Cornelis, T De Wolf, EA Janssen, X Knutsson, A Lauwers, J Luyckx, S Van De Klundert, M Van Haevermaet, H Van Mechelen, P Van Remortel, N Van Spilbeeck, A Abu Zeid, S Blekman, F D Hondt, J Daci, N De Bruyn, I Deroover, K Heracleous, N Keaveney, J Lowette, S Moreels, L Olbrechts, A Python, Q Strom, D Tavernier, S Van Doninck, W Van Mulders, P Van Onsem, GP Van Parijs, I Barria, P Brun, H Caillol, C Clerbaux, B De Lentdecker, G Fang, W Fasanella, G Favart, L Goldouzian, R Grebenyuk, A Karapostoli, G Lenzi, T Léonard, A Maerschalk, T Marinov, A Perniè, L Randle-conde, A Seva, T Vander Velde, C Vanlaer, P Yonamine, R Zenoni, F Zhang, F Beernaert, K |
| Item Type: | Journal Article |
| Abstract: | A search for exclusive or quasi-exclusive γγ → W+W− production, via pp → p(*)W+W−p(*) → p(*)μ±e∓p(*) at √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 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 a0,CW (dimension-6) and fM0,1,2,3 (dimension-8), the most stringent to date, are derived from the measured dilepton transverse momentum spectrum. |
| Issue Date: | 22-Aug-2016 |
| Date of Acceptance: | 2-Aug-2016 |
| URI: | http://hdl.handle.net/10044/1/40764 |
| DOI: | https://dx.doi.org/10.1007/JHEP08(2016)119 |
| ISSN: | 1126-6708 |
| Publisher: | Springer |
| Journal / Book Title: | Journal of High Energy Physics |
| Volume: | 2016 |
| Issue: | 8 |
| Copyright Statement: | Open Access, Copyright CERN, for the benefit of the CMS Collaboration. Article funded by SCOAP3 |
| Keywords: | Nuclear & Particles Physics 01 Mathematical Sciences 02 Physical Sciences |
| Publication Status: | Published |
| Article Number: | 119 |
| Appears in Collections: | Physics High Energy Physics Faculty of Natural Sciences |