Evidence for the spin-0 nature of the Higgs boson using ATLAS data

G. Aad; T. Abajyan; B. Abbott; J.J. Abdallah; S.A. Khalek; Mogens Dam; Jørgen Beck Hansen; Peter Henrik Hansen; John Renner Hansen; Jørn Dines Hansen; Simon Johann Franz Heisterkamp; Nele Maria Philomena Boelaert; Morten Dam Jørgensen; Esben Bryndt Klinkby; Ask Emil Løvschall-Jensen; Sascha Mehlhase; Björn Stefan Nilsson; Troels Christian Petersen; Stefania Xella

doi:10.1016/j.physletb.2013.08.026

Evidence for the spin-0 nature of the Higgs boson using ATLAS data

G. Aad, T. Abajyan, B. Abbott, J.J. Abdallah, S.A. Khalek, Mogens Dam, Jørgen Beck Hansen, Peter Henrik Hansen, John Renner Hansen, Jørn Dines Hansen, Simon Johann Franz Heisterkamp, Nele Maria Philomena Boelaert, Morten Dam Jørgensen, Esben Bryndt Klinkby, Ask Emil Løvschall-Jensen, Sascha Mehlhase, Björn Stefan Nilsson, Troels Christian Petersen, Stefania Xella

Experimental Particle Physics

335 Citations (Scopus)

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 J^P=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 J^P=0⁺ quantum numbers for the Higgs boson, whereas all alternative hypotheses studied in this Letter, namely some specific J^P=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 J^P=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.

Original language	English
Journal	Physics Letters B
Volume	726
Issue number	1-3
Pages (from-to)	120-144
ISSN	0370-2693
DOIs	https://doi.org/10.1016/j.physletb.2013.08.026
Publication status	Published - 2 Oct 2013

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Aad, G., Abajyan, T., Abbott, B., Abdallah, J. J., Khalek, S. A., Dam, M., Hansen, J. B., Hansen, P. H., Hansen, J. R., Hansen, J. D., Heisterkamp, S. J. F., Boelaert, N. M. P., Jørgensen, M. D., Klinkby, E. B., Løvschall-Jensen, A. E., Mehlhase, S., Nilsson, B. S., Petersen, T. C., & Xella, S. (2013). Evidence for the spin-0 nature of the Higgs boson using ATLAS data. Physics Letters B, 726(1-3), 120-144. https://doi.org/10.1016/j.physletb.2013.08.026

Aad, G, Abajyan, T, Abbott, B, Abdallah, JJ, Khalek, SA, Dam, M , Hansen, JB , Hansen, PH , Hansen, JR , Hansen, JD, Heisterkamp, SJF, Boelaert, NMP, Jørgensen, MD, Klinkby, EB, Løvschall-Jensen, AE, Mehlhase, S, Nilsson, BS, Petersen, TC & Xella, S 2013, 'Evidence for the spin-0 nature of the Higgs boson using ATLAS data', Physics Letters B, vol. 726, no. 1-3, pp. 120-144. https://doi.org/10.1016/j.physletb.2013.08.026

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title = "Evidence for the spin-0 nature of the Higgs boson using ATLAS data",

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.",

author = "G. Aad and T. Abajyan and B. Abbott and J.J. Abdallah and S.A. Khalek and Mogens Dam and Hansen, {J{\o}rgen Beck} and Hansen, {Peter Henrik} and Hansen, {John Renner} and Hansen, {J{\o}rn Dines} and Heisterkamp, {Simon Johann Franz} and Boelaert, {Nele Maria Philomena} and J{\o}rgensen, {Morten Dam} and Klinkby, {Esben Bryndt} and L{\o}vschall-Jensen, {Ask Emil} and Sascha Mehlhase and Nilsson, {Bj{\"o}rn Stefan} and Petersen, {Troels Christian} and Stefania Xella",

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T1 - Evidence for the spin-0 nature of the Higgs boson using ATLAS data

AU - Aad, G.

AU - Abajyan, T.

AU - Abbott, B.

AU - Abdallah, J.J.

AU - Khalek, S.A.

AU - Dam, Mogens

AU - Hansen, Jørgen Beck

AU - Hansen, Peter Henrik

AU - Hansen, John Renner

AU - Hansen, Jørn Dines

AU - Heisterkamp, Simon Johann Franz

AU - Boelaert, Nele Maria Philomena

AU - Jørgensen, Morten Dam

AU - Klinkby, Esben Bryndt

AU - Løvschall-Jensen, Ask Emil

AU - Mehlhase, Sascha

AU - Nilsson, Björn Stefan

AU - Petersen, Troels Christian

AU - Xella, Stefania

PY - 2013/10/2

Y1 - 2013/10/2

N2 - 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.

AB - 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.

U2 - 10.1016/j.physletb.2013.08.026

DO - 10.1016/j.physletb.2013.08.026

M3 - Journal article

SN - 0370-2693

VL - 726

SP - 120

EP - 144

JO - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

JF - Physics Letters B: Particle Physics, Nuclear Physics and Cosmology

IS - 1-3

ER -

Evidence for the spin-0 nature of the Higgs boson using ATLAS data

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