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http://bura.brunel.ac.uk/handle/2438/13208
Title: | Evidence for exclusive γγ → W+W− 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 |
Keywords: | Forward physics;Hadron-Hadron scattering (experiments) |
Issue Date: | 2016 |
Publisher: | Springer |
Citation: | Journal of High Energy Physics, 2016(8):119, pp. 1-47, (2016) |
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. |
URI: | http://link.springer.com/article/10.1007%2FJHEP08%282016%29119 http://bura.brunel.ac.uk/handle/2438/13208 |
DOI: | http://dx.doi.org/10.1007/JHEP08(2016)119 |
ISSN: | 1126-6708 |
Appears in Collections: | Dept of Electronic and Electrical Engineering Research Papers |
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