# Observation of electroweak production of Wγ with two jets in proton-proton collisions at √s = 13 TeV

CMS Collaboration; Sirunyan, A.M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Bergauer, T.; Dragicevic, M.; Erö, J.; Escalante Del Valle, A.; Frühwirth, R.; Jeitler, M.; Krammer, N.; Lechner, L.; Liko, D.; Madlener, T.; Mikulec, I.; Pitters, F.M.; Rad, N.; Schieck, J.; Schöfbeck, R.; Spanring, M.; ... mehr

##### Abstract:
A first observation is presented for the electroweak production of a W boson, a photon, and two jets in proton-proton collisions. The W boson decays are selected by requiring one identified electron or muon and an imbalance in transverse momentum. The two jets are required to have a high dijet mass and a large separation in pseudorapidity. The measurement is based on data collected with the CMS detector at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The observed (expected) significance for this process is 4.9 (4.6) standard deviations. After combining with previously reported CMS results at 8 TeV, the observed (expected) significance is 5.3 (4.8) standard deviations. The cross section for the electroweak W$_{γjj}$ production in a restricted fiducial region is measured as 20.4 +/- 4.5 fb and the total cross section for W$_{γ}$ production in association with 2 jets in the same fiducial region is 108 +/- 16 fb. All results are in good agreement with recent theoretical predictions. Constraints are placed on anomalous quartic gauge couplings in terms of dimension-8 effective field theory operators.

 Zugehörige Institution(en) am KIT Institut für Prozessdatenverarbeitung und Elektronik (IPE)Institut für Astroteilchenphysik (IAP) Publikationstyp Zeitschriftenaufsatz Publikationsdatum 10.12.2020 Sprache Englisch Identifikator ISSN: 0370-2693 KITopen-ID: 1000127733 HGF-Programm 51.03.03 (POF III, LK 01) Kosmische Strahlung Auger Erschienen in Physics letters / B Verlag North-Holland Publishing Band 811 Seiten Art.-Nr. 135988 Bemerkung zur Veröffentlichung Gefördert durch SCOAP3 Nachgewiesen in Dimensions
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