Measurement of W±Z production cross sections and gauge boson polarisation in pp collisions at √ s = 13 TeV with the ATLAS detector
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The European Physical Journal C
Date
2019-06-22Referencia bibliográfica
Abraham, N L, Allbrooke, B M M, Asquith, L, Cerri, A, De Santo, A, Jones, S D, Salvatore, F, Shaw, K, Stevenson, T J, Suruliz, K, Sutton, M R, Tresoldi, F, Trovato, F, Vivarelli, I, Winkels, E et al. (2019) Measurement of W±Z production cross sections and gauge boson polarisation in pp collisions at √s = 13 TeV with the ATLAS detector. European Physical Journal C - Particles and Fields, 79 (6). a535 1-34. ISSN 1434-6044
Sponsorship
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, CEA-DRF/IRFU, France; SRNSFG, Georgia; BMBF, HGF, and MPG, Germany; GSRT, Greece; RGC, Hong Kong SAR, China; ISF and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; NWO, Netherlands; RCN,Norway;MNiSWand NCN, Poland; FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MESTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC andWallenberg Foundation, Sweden; SERI, SNSF andCantons of Bern andGeneva, Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, UK; DOE and NSF, USA. In addition, individual groups and members have received support from BCKDF, CANARIE, CRC and Compute Canada, Canada; COST, ERC, ERDF, Horizon 2020, andMarie Skłodowska-Curie Actions, European Union; Investissements d’ Avenir Labex and Idex, ANR, France; DFG and AvH Foundation, Germany; Herakleitos, Thales and Aristeia programmes co-financed by EU-ESF and the Greek NSRF, Greece; BSFNSF and GIF, Israel; CERCA Programme Generalitat de Catalunya, Spain; The Royal Society and Leverhulme Trust, UK.Abstract
This paper presents measurements of W±Z production
cross sections in pp collisions at a centre-of-mass
energy of 13 TeV. The data were collected in 2015 and 2016
by the ATLAS experiment at the Large Hadron Collider,
and correspond to an integrated luminosity of 36.1 fb−1.
The W±Z candidate events are reconstructed using leptonic
decay modes of the gauge bosons into electrons and muons.
The measured inclusive cross section in the detector fiducial
region for a single leptonic decay mode is σfid.
W±Z→
ν
=
63.7 ± 1.0 (stat.) ± 2.3 (syst.) ± 1.4 (lumi.) fb, reproduced
by the next-to-next-to-leading-order Standard Model
prediction of 61.5+1.4
−1.3 fb. Cross sections for W+Z and W−Z
production and their ratio are presented as well as differential
cross sections for several kinematic observables. An analysis
of angular distributions of leptons from decays of W and
Z bosons is performed for the first time in pair-produced
events in hadronic collisions, and integrated helicity fractions
in the detector fiducial region are measured for the W
and Z bosons separately. Of particular interest, the longitudinal
helicity fraction of pair-produced vector bosons is also
measured.