Measurement of W +/- Z production cross sections and gauge boson polarisation in pp collisions at root s=13 TeV with the ATLAS detectorVisa övriga samt affilieringar
Antal upphovsmän: 29342019 (Engelska)Ingår i: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 79, nr 6, artikel-id 535Artikel i tidskrift (Refereegranskat) Published
Abstract [en]
This paper presents measurements of W +/- Z production cross sections in pp collisions at a centre-of-mass energy of 13TeV. The data were collected in 2015 and 2016 by the ATLAS experiment at the Large Hadron Collider, and correspond to an integrated luminosity of 36.1fb-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 sigma W +/- Zfid.=63.7fb, reproduced by the next-to-next-to-leading-order Standard Model prediction of 61.5-1.3+1.4fb. 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.
Ort, förlag, år, upplaga, sidor
Springer, 2019. Vol. 79, nr 6, artikel-id 535
Nationell ämneskategori
Fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-255313DOI: 10.1140/epjc/s10052-019-7027-6ISI: 000472517300002Scopus ID: 2-s2.0-85067836155OAI: oai:DiVA.org:kth-255313DiVA, id: diva2:1341429
Anmärkning
QC 20190808
Erratum: DOI:10.1140/epjc/s10052-018-6520-7
2019-08-082019-08-082024-03-15Bibliografiskt granskad