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
Number of Authors: 2871
2016 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 76, no 12, 658Article in journal (Refereed) Published
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. © 2016, CERN for the benefit of the ATLAS collaboration.
Place, publisher, year, edition, pages
Springer, 2016. Vol. 76, no 12, 658
IdentifiersURN: urn:nbn:se:kth:diva-202931DOI: 10.1140/epjc/s10052-016-4499-5ScopusID: 2-s2.0-85002412629OAI: oai:DiVA.org:kth-202931DiVA: diva2:1079046
QC 201703072017-03-072017-03-072017-03-07Bibliographically approved