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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Dosyalar
Tarih
2016-11-29
Yazarlar
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Yayıncı
Springer
Erişim Hakkı
info:eu-repo/semantics/openAccess
Özet
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 t leptons and is based on 20.3 fb(-1) of proton-proton collision data at root 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) over tilde. 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) over tilde is constrained to the interval (-0.11, 0.05) at 68% confidence level, consistent with the Standard Model expectation of (d) over tilde = 0.
Açıklama
Anahtar Kelimeler
TRIPLE GAUGE COUPLINGS, TAU-POLARIZATION, W-BOSON, HADRON COLLIDERS, W+W-PRODUCTION, CROSS-SECTION, ASYMMETRY, VIOLATION, PROGRAM, NLO
Kaynak
European Physical Journal C
WoS Q Değeri
Q1
