Evidence for electroweak production of two jets in association with a Zγ pair in pp collisions at s=13 TeV with the ATLAS detector

G Aad; B Abbott; DC Abbott; A Abed Abud; K Abeling; DK Abhayasinghe; SH Abidi; OS AbouZeid; NL Abraham; H Abramowicz; H Abreu; Y Abulaiti; BS Acharya; B Achkar; S Adachi; L Adam; C Adam Bourdarios; L Adamczyk; L Adamek; J Adelman; M Adersberger; A Adiguzel; S Adorni; T Adye; AA Affolder; Y Afik; C Agapopoulou; MN Agaras; A Aggarwal; C Agheorghiesei; JA Aguilar-Saavedra; F Ahmadov; WS Ahmed; X Ai; G Aielli; S Akatsuka; TPA Åkesson; E Akilli; AV Akimov; K Al Khoury; GL Alberghi; J Albert; MJ Alconada Verzini; S Alderweireldt; M Aleksa; IN Aleksandrov; C Alexa; T Alexopoulos; A Alfonsi; F Alfonsi; M Alhroob; B Ali; M Aliev; G Alimonti; SP Alkire; C Allaire; BMM Allbrooke; BW Allen; PP Allport; A Aloisio; A Alonso; F Alonso; C Alpigiani; AA Alshehri; M Alvarez Estevez; D Álvarez Piqueras; MG Alviggi; Y Amaral Coutinho; A Ambler; L Ambroz; C Amelung; D Amidei; SP Amor Dos Santos; S Amoroso; CS Amrouche; F An; C Anastopoulos; N Andari; T Andeen; CF Anders; JK Anders; A Andreazza; V Andrei; CR Anelli; S Angelidakis; A Angerami; AV Anisenkov; A Annovi; C Antel; MT Anthony; E Antipov; M Antonelli; DJA Antrim; F Anulli; M Aoki; JA Aparisi Pozo; L Aperio Bella; JP Araque; V Araujo Ferraz; R Araujo Pereira

Journal article

Evidence for electroweak production of two jets in association with a Zγ pair in pp collisions at s=13 TeV with the ATLAS detector

G Aad, B Abbott, DC Abbott, A Abed Abud, K Abeling, DK Abhayasinghe, SH Abidi, OS AbouZeid, NL Abraham, H Abramowicz, H Abreu, Y Abulaiti, BS Acharya, B Achkar, S Adachi, L Adam, C Adam Bourdarios, L Adamczyk, L Adamek, J Adelman Show all

Physics Letters Section B Nuclear Elementary Particle and High Energy Physics | Published : 2020

DOI: 10.1016/j.physletb.2020.135341

Abstract

Evidence for electroweak production of two jets in association with a Zγ pair in s=13 TeV proton–proton collisions at the Large Hadron Collider is presented. The analysis uses data collected by the ATLAS detector in 2015 and 2016 that corresponds to an integrated luminosity of 36.1fb−1. Events that contain a Z boson candidate decaying leptonically into either e+e− or μ+μ−, a photon, and two jets are selected. The electroweak component is measured with observed and expected significances of 4.1 standard deviations. The fiducial cross-section for electroweak production is measured to be σZγjj−EW=7.8±2.0fb, in good agreement with the Standard Model prediction.

University of Melbourne Researchers

Federico Scutti Author

Elisabetta Barberio Author

Jafar Shojaii Author

G. N. Taylor Author

Grants

Awarded by Departamento Administrativo de Ciencia, Tecnología e Innovación (COLCIENCIAS)

Funding Acknowledgements

We acknowledge the support of ANPCyT, Argentina; YerPhI, Armenia; ARC, Australia; BMWFW and FWF, Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN; CONICYT, Chile; CAS, MOST and NSFC, China; COLCIENCIAS, Colombia; MSMT CR, MPO CR and VSC CR, Czech Republic; DNRF and DNSRC, Denmark; IN2P3-CNRS and CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF and MPG, Germany; GSRT, Greece; RGC and Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN, Norway; MNiSW and NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russia Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZS, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America. In addition, individual groups and members have received support from BCKDF, CANARIE, Compute Canada and CRC, Canada; ERC, ERDF, Horizon 2020, Marie Sklodowska-Curie Actions and COST, European Union; Investissements d'Avenir Labex, Investissements d'Avenir Idex and ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA Programme Generalitat de Catalunya and PROMETEO Programme Generalitat Valenciana, Spain; Goran Gustafssons Stiftelse, Sweden; The Royal Society and Leverhulme Trust, United Kingdom. The crucial computing support from all WLCG partners is acknowledged gratefully, in particular from CERN, the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF (Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF (Italy), NLT1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (UK) and BNL (USA), the Tier-2 facilities worldwide and large non-WLCG resource providers. Major contributors of computing resources are listed in Ref.[80].