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https://hdl.handle.net/2440/81987
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Type: | Journal article |
Title: | Evidence for the spin-0 nature of the Higgs boson using ATLAS data |
Author: | Aad, G. Jackson, P. Soni, N. White, M. |
Citation: | Physics Letters B: Nuclear Physics and Particle Physics, 2013; 726(1-3):120-144 |
Publisher: | Elsevier Science BV |
Issue Date: | 2013 |
ISSN: | 0370-2693 1873-2445 |
Contributor: | Jackson, Paul Douglas Soni, Nitesh White, Martin |
Statement of Responsibility: | ATLAS Collaboration |
Abstract: | Studies of the spin and parity quantum numbers of the Higgs boson are presented, based on proton-proton collision data collected by the ATLAS experiment at the LHC. The Standard Model spin-parity JP=0+ hypothesis is compared with alternative hypotheses using the Higgs boson decays H→γγ, H→ZZ*→4ℓ and H→WW*→ℓνℓν, as well as the combination of these channels. The analysed dataset corresponds to an integrated luminosity of 20.7 fb-1 collected at a centre-of-mass energy of s=8TeV. For the H→ZZ*→4ℓ decay mode the dataset corresponding to an integrated luminosity of 4.6 fb-1 collected at s=7TeV is included. The data are compatible with the Standard Model JP=0+ quantum numbers for the Higgs boson, whereas all alternative hypotheses studied in this Letter, namely some specific JP=0-, 1+, 1-, 2+ models, are excluded at confidence levels above 97.8%. This exclusion holds independently of the assumptions on the coupling strengths to the Standard Model particles and in the case of the JP=2+ model, of the relative fractions of gluon-fusion and quark-antiquark production of the spin-2 particle. The data thus provide evidence for the spin-0 nature of the Higgs boson, with positive parity being strongly preferred. © 2013 CERN. |
Keywords: | Higgs boson Spin Parity |
Description: | ATLAS Collaboration contributors: P. D. Jackson, N. Soni and M. White for the University of Adelaide. |
Rights: | © 2013 CERN. |
DOI: | 10.1016/j.physletb.2013.08.026 |
Published version: | http://dx.doi.org/10.1016/j.physletb.2013.08.026 |
Appears in Collections: | Aurora harvest Chemistry and Physics publications |
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