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Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector

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ATLAS collaboration (Including: Beckingham, M., Ennis, Joseph Stanford, Farrington, Sinead, Harrison, P. F., Jeske, C., Jones, G. (Graham), Martin, T. A., Murray, W., Pianori, E. and Spangenberg, Martin). (2016) Test of CP invariance in vector-boson fusion production of the Higgs boson using the Optimal Observable method in the ditau decay channel with the ATLAS detector. European Physical Journal C, 76 (12). 658. doi:10.1140/epjc/s10052-016-4499-5

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Official URL: http://dx.doi.org/10.1140/epjc/s10052-016-4499-5

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Abstract

A test of CP invariance in Higgs boson production via vector-boson fusion using the method of the Optimal Observable is presented. The analysis exploits the decay mode of the Higgs boson into a pair of τ leptons and is based on 20.3 fb−1 of proton–proton collision data at s√ = 8 TeV collected by the ATLAS experiment at the LHC. Contributions from CP-violating interactions between the Higgs boson and electroweak gauge bosons are described in an effective field theory framework, in which the strength of CP violation is governed by a single parameter d~. The mean values and distributions of CP-odd observables agree with the expectation in the Standard Model and show no sign of CP violation. The CP-mixing parameter d~ is constrained to the interval (−0.11,0.05) at 68% confidence level, consistent with the Standard Model expectation of d~=0.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Higgs bosons, Leptons (Nuclear physics) -- Decay, Large Hadron Collider (France and Switzerland)
Journal or Publication Title: European Physical Journal C
Publisher: Springer
ISSN: 1434-6044
Official Date: 29 November 2016
Dates:
DateEvent
29 November 2016Available
8 November 2016Accepted
16 February 2016Submitted
Volume: 76
Number: 12
Article Number: 658
DOI: 10.1140/epjc/s10052-016-4499-5
Status: Peer Reviewed
Publication Status: Published
Access rights to Published version: Open Access
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
UNSPECIFIEDRoyal Societyhttp://dx.doi.org/10.13039/501100000288
UNSPECIFIEDLeverhulme Trusthttp://dx.doi.org/10.13039/501100000275

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