https://scholars.lib.ntu.edu.tw/handle/123456789/573502
標題: | W+W- boson pair production in proton-proton collisions at s =13 TeV | 作者: | KAI-FENG CHEN PAO-TI CHANG WEI-SHU HOUl |
公開日期: | 2020 | 卷: | 102 | 期: | 9 | 來源出版物: | Physical Review D | 摘要: | A measurement of the W+W- boson pair production cross section in proton-proton collisions at s=13 TeV is presented. The data used in this study are collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 35.9 fb-1. The W+W- candidate events are selected by requiring two oppositely charged leptons (electrons or muons). Two methods for reducing background contributions are employed. In the first one, a sequence of requirements on kinematic quantities is applied allowing a measurement of the total production cross section, 117.6±6.8 pb, which agrees well with the theoretical prediction. Fiducial cross sections are also reported for events with zero or one jet, and the change in the zero-jet fiducial cross section with the jet transverse momentum threshold is measured. Normalized differential cross sections are reported within the fiducial region. A second method for suppressing background contributions employs two random forest classifiers. The analysis based on this method includes a measurement of the total production cross section and also a measurement of the normalized jet multiplicity distribution in W+W- events. Finally, a dilepton invariant mass distribution is used to probe for physics beyond the standard model in the context of an effective field theory, and constraints on the presence of dimension-6 operators are derived. ? 2020 CERN. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85096654850&doi=10.1103%2fPhysRevD.102.092001&partnerID=40&md5=a4d24675a9bedb3828295921f426d610 https://scholars.lib.ntu.edu.tw/handle/123456789/573502 |
ISSN: | 24700010 | DOI: | 10.1103/PhysRevD.102.092001 |
顯示於: | 物理學系 |
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