Sirunyan, AM and Tumasyan, A and Adam, W and Ambrogi, F and Bergauer, T and Choudhury, S and Komaragiri, JR and Kumar, D and Panwar, L and Tiwari, PC (2020) W+W- boson pair production in proton-proton collisions at s =13 TeV. In: Physical Review D, 102 (9).
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Abstract
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.
| Item Type: | Journal Article |
|---|---|
| Publication: | Physical Review D |
| Publisher: | American Physical Society |
| Additional Information: | Copyright to this article belongs to American Physical Society |
| Department/Centre: | Division of Physical & Mathematical Sciences > Centre for High Energy Physics |
| Date Deposited: | 15 Mar 2021 06:41 |
| Last Modified: | 15 Mar 2021 06:41 |
| URI: | http://eprints.iisc.ac.in/id/eprint/67244 |
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