Search for Higgs boson decays into a pair of pseudoscalar particles in the Î³Î³Ï„ had Ï„ had final state using pp collisions at s = 13 TeV with the ATLAS detector

Physics

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Experimental Particle Physics

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https://doi.org/10.1007/jhep03(2025)190
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Available under license: CC BY: Creative Commons Attribution 4.0 International License

Keywords

Hadron-Hadron Scattering

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Search for Higgs boson decays into a pair of pseudoscalar particles in the Î³Î³Ï„ had Ï„ had final state using pp collisions at s = 13 TeV with the ATLAS detector. / The ATLAS collaboration ; McElhinney, Luke.
In: Journal of High Energy Physics, Vol. 2025, No. 3, 190, 25.03.2025.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Bibtex

@article{46d39f092d95441c85e34c3c3f0d8a56,

title = "Search for Higgs boson decays into a pair of pseudoscalar particles in the {\^I}³{\^I}³{\"I}„ had {\"I}„ had final state using pp collisions at s = 13 TeV with the ATLAS detector",

abstract = "A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H {\^a}†{\textquoteright} aa, where one decays into a photon pair and the other into a {\"I}„-lepton pair, is presented. Hadronic decays of the {\"I}„-leptons are considered and reconstructed using a dedicated tagger for collimated {\"I}„-lepton pairs. The search uses 140 fb{\^a}ˆ{\textquoteright}1 of proton-proton collision data at a centre-of-mass energy of s = 13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider. The search is performed in the mass range of the a boson between 10 GeV and 60 GeV. No significant excess of events is observed above the Standard Model background expectation. Model-independent upper limits at 95% confidence level are set on the branching ratio of the Higgs boson to the {\^I}³{\^I}³{\"I}„{\"I}„ final state, B(H {\^a}†{\textquoteright} aa {\^a}†{\textquoteright} {\^I}³{\^I}³{\"I}„{\"I}„), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis.",

keywords = "Hadron-Hadron Scattering",

author = "{The ATLAS collaboration} and Hamadi Ali and Zainab Alsolami and A.E. Barton and G. Borissov and E.V. Bouhova-Thacker and James Ferrando and H. Fox and Alina Hagan and R.W.L. Jones and V. Kartvelishvili and P.A. Love and E.J. Marshall and Luke McElhinney and L. Meng and Elliot Sampson and M. Smizanska and A.M. Wharton",

year = "2025",

month = mar,

day = "25",

doi = "10.1007/jhep03(2025)190",

language = "English",

volume = "2025",

journal = "Journal of High Energy Physics",

issn = "1029-8479",

publisher = "Springer-Verlag",

number = "3",

}

RIS

TY - JOUR

T1 - Search for Higgs boson decays into a pair of pseudoscalar particles in the Î³Î³Ï„ had Ï„ had final state using pp collisions at s = 13 TeV with the ATLAS detector

AU - The ATLAS collaboration

AU - Ali, Hamadi

AU - Alsolami, Zainab

AU - Barton, A.E.

AU - Borissov, G.

AU - Bouhova-Thacker, E.V.

AU - Ferrando, James

AU - Fox, H.

AU - Hagan, Alina

AU - Jones, R.W.L.

AU - Kartvelishvili, V.

AU - Love, P.A.

AU - Marshall, E.J.

AU - McElhinney, Luke

AU - Meng, L.

AU - Sampson, Elliot

AU - Smizanska, M.

AU - Wharton, A.M.

PY - 2025/3/25

Y1 - 2025/3/25

N2 - A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H â†’ aa, where one decays into a photon pair and the other into a Ï„-lepton pair, is presented. Hadronic decays of the Ï„-leptons are considered and reconstructed using a dedicated tagger for collimated Ï„-lepton pairs. The search uses 140 fbâˆ’1 of proton-proton collision data at a centre-of-mass energy of s = 13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider. The search is performed in the mass range of the a boson between 10 GeV and 60 GeV. No significant excess of events is observed above the Standard Model background expectation. Model-independent upper limits at 95% confidence level are set on the branching ratio of the Higgs boson to the Î³Î³Ï„Ï„ final state, B(H â†’ aa â†’ Î³Î³Ï„Ï„), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis.

AB - A search for exotic decays of the 125 GeV Higgs boson into a pair of new spin-0 particles, H â†’ aa, where one decays into a photon pair and the other into a Ï„-lepton pair, is presented. Hadronic decays of the Ï„-leptons are considered and reconstructed using a dedicated tagger for collimated Ï„-lepton pairs. The search uses 140 fbâˆ’1 of proton-proton collision data at a centre-of-mass energy of s = 13 TeV recorded between 2015 and 2018 by the ATLAS experiment at the Large Hadron Collider. The search is performed in the mass range of the a boson between 10 GeV and 60 GeV. No significant excess of events is observed above the Standard Model background expectation. Model-independent upper limits at 95% confidence level are set on the branching ratio of the Higgs boson to the Î³Î³Ï„Ï„ final state, B(H â†’ aa â†’ Î³Î³Ï„Ï„), ranging from 0.2% to 2%, depending on the a-boson mass hypothesis.

KW - Hadron-Hadron Scattering

U2 - 10.1007/jhep03(2025)190

DO - 10.1007/jhep03(2025)190

M3 - Journal article

VL - 2025

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 3

M1 - 190

ER -

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