Measurement of the Cross Section for Electroweak Production of Zγ in Association with Two Jets and Constraints on Anomalous Quartic Gauge Couplings in Proton–proton Collisions At √s = 8 TeV

CMS Collaboration; Abercrombie, Daniel Robert; Allen, Brandon Leigh; Apyan, Aram; Barbieri, Richard Alexander; Baty, Austin Alan; Bi, Ran; Bierwagen, Katharina; Brandt, Stephanie Akemi; Busza, Wit; Cali, Ivan Amos; Demiragli, Zeynep; Di Matteo, Leonardo; Gomez-Ceballos, Guillelmo; Goncharov, Maxim; Hsu, Dylan George; Iiyama, Yutaro; Innocenti, Gian Michele; Klute, Markus; Kovalskyi, Dmytro; Krajczar, Krisztian F.; Lai, Yue Shi; Lee, Yen-Jie; Levin, Amy Elizabeth; Luckey Jr, P David; Marini, Andrea Carlo; McGinn, Christopher Francis; Mironov, Camelia Maria; Narayanan, Siddharth Madhavan; Niu, Xinmei; Paus, Christoph M. E.; Roland, Christof E; Roland, Gunther M; Salfeld-Nebgen, Jakob Maxillian Henry; Stephans, George S. F.; Sumorok, Konstanty C; Tatar, Kaya; Varma, Mukund Madhav; Velicanu, Dragos Alexandru; Veverka, Jan; Wang, Jing; Wang, Ta-Wei; Wyslouch, Boleslaw; Yang, Ming; Wyslouch, Victoria

Author(s)

CMS Collaboration; Abercrombie, Daniel Robert; Allen, Brandon Leigh; Apyan, Aram; Barbieri, Richard Alexander; ... Show more

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Abstract

A measurement is presented of the cross section for the electroweak production of a Z boson and a photon in association with two jets in proton–proton collisions at √s = 8 TeV. The Z bosons are identified through their decays to electron or muon pairs. The measurement is based on data collected with the CMS detector corresponding to an integrated luminosity of 19.7 fb⁻¹. The electroweak contribution has a significance of 3.0 standard deviations, and the measured fiducial cross section is 1.86[subscript −0.75][superscript +0.90](stat)[subscript −0.26][superscript +0.34](syst) ±0.05(lumi) fb, while the summed electroweak and quantum chromodynamic total cross section in the same region is observed to be 5.94[subscript −1.35][superscript +1.53](stat)[subscript −0.37][superscript +0.43](syst)± 0.13(lumi) fb. Both measurements are consistent with the leading-order standard model predictions. Limits on anomalous quartic gauge couplings are set based on the Zγ mass distribution. Keywords: CMS; Physics; aQGC; Electroweak production

Date issued

2017-05

URI

http://hdl.handle.net/1721.1/119228

Department

Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Department of Physics; Massachusetts Institute of Technology. Laboratory for Nuclear Science

Journal

Physics Letters B

Publisher

Elsevier

Citation

Khachatryan, V. et al. “Measurement of the Cross Section for Electroweak Production of Zγ in Association with Two Jets and Constraints on Anomalous Quartic Gauge Couplings in Proton–proton Collisions At √s = 8 TeV.” Physics Letters B 770 (July 2017): 380–402 © 2017 The Authors

Version: Final published version

ISSN

0370-2693

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