Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector

ATLAS Collaboration, Philip Allport, Benedict Allbrooke, Ludovica Aperio Bella, Hardeep Bansil, Juraj Bracinik, David Charlton, Andrew Chisholm, Andrew Daniells, Christopher Hawkes, Simon Head, Stephen Hillier, Mark Levy, Richard Mudd, Javier Murillo Quijada, Paul Newman, Konstantinos Nikolopoulos, Rhys Owen, Mark Slater, Jurgen ThomasPaul Thompson, Alan Watson, Miriam Watson, John Wilson

Research output: Contribution to journalArticlepeer-review

135 Citations (Scopus)
106 Downloads (Pure)

Abstract

Studies of the spin, parity and tensor couplings of the Higgs boson in the H→ZZ∗→4ℓ, H→WW∗→eνμν and H→γγ decay processes at the LHC are presented. The investigations are based on 25fb−1 of pp collision data collected by the ATLAS experiment at s√=7 TeV and s√=8 TeV. The Standard Model (SM) Higgs boson hypothesis, corresponding to the quantum numbers JP=0+, is tested against several alternative spin scenarios, including non-SM spin-0 and spin-2 models with universal and non-universal couplings to fermions and vector bosons. All tested alternative models are excluded in favour of the SM Higgs boson hypothesis at more than 99.9 % confidence level. Using the H→ZZ∗→4ℓ and H→WW∗→eνμν decays, the tensor structure of the interaction between the spin-0 boson and the SM vector bosons is also investigated. The observed distributions of variables sensitive to the non-SM tensor couplings are compatible with the SM predictions and constraints on the non-SM couplings are derived.
Original languageEnglish
Article number476
Number of pages36
JournalEuropean Physical Journal C
Volume75
Issue number10
DOIs
Publication statusPublished - 6 Oct 2015

Fingerprint

Dive into the research topics of 'Study of the spin and parity of the Higgs boson in diboson decays with the ATLAS detector'. Together they form a unique fingerprint.

Cite this