TY - JOUR
T1 - Searches for exclusive Higgs and Z boson decays into a vector quarkonium state and a photon using 139 fb - 1 of ATLAS √s=13 TeV proton–proton collision data
AU - ATLAS Collaboration
AU - Aad, G.
AU - Abbott, B.
AU - Abbott, D. C.
AU - Abeling, K.
AU - Abidi, S. H.
AU - Aboulhorma, A.
AU - Abramowicz, H.
AU - Abreu, H.
AU - Abulaiti, Y.
AU - Hoffman, A. C.Abusleme
AU - Acharya, B. S.
AU - Achkar, B.
AU - Bourdarios, C. Adam
AU - Adamczyk, L.
AU - Adamek, L.
AU - Addepalli, S. V.
AU - Adelman, J.
AU - Adiguzel, A.
AU - Adorni, S.
AU - Adye, T.
AU - Affolder, A. A.
AU - Afik, Y.
AU - Agaras, M. N.
AU - Agarwala, J.
AU - Aggarwal, A.
AU - Agheorghiesei, C.
AU - Aguilar-Saavedra, J. A.
AU - Ahmad, A.
AU - Ahmadov, F.
AU - Ahmed, W. S.
AU - Ahuja, S.
AU - Ai, X.
AU - Aielli, G.
AU - Aizenberg, I.
AU - Akbiyik, M.
AU - Åkesson, T. P.A.
AU - Akimov, A. V.
AU - Khoury, K. Al
AU - Alberghi, G. L.
AU - Albert, J.
AU - Albicocco, P.
AU - Verzini, M. J.Alconada
AU - Alderweireldt, S.
AU - Aleksa, M.
AU - Aleksandrov, I. N.
AU - Alexa, C.
AU - Alexopoulos, T.
AU - Alfonsi, A.
AU - Mahon, D. J.
AU - Muse, J. M.
N1 - Publisher Copyright:
© 2023, The Author(s).
PY - 2023/9
Y1 - 2023/9
N2 - Searches for the exclusive decays of Higgs and Z bosons into a vector quarkonium state and a photon are performed in the μ+μ-γ final state with a proton–proton collision data sample corresponding to an integrated luminosity of 139 fb - 1 collected at s=13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The observed data are compatible with the expected backgrounds. The 95% confidence-level upper limits on the branching fractions of the Higgs boson decays into J/ψγ , ψ(2S)γ , and Υ(1S,2S,3S)γ are found to be 2.0 × 10 - 4 , 10.5 × 10 - 4 , and (2.5 , 4.2 , 3.4) × 10 - 4 , respectively, assuming Standard Model production of the Higgs boson. The corresponding 95% CL upper limits on the branching fractions of the Z boson decays are 1.2 × 10 - 6 , 2.4 × 10 - 6 , and (1.1 , 1.3 , 2.4) × 10 - 6 . An observed 95% CL interval of (- 133 , 175) is obtained for the κc/ κγ ratio of Higgs boson coupling modifiers, and a 95% CL interval of (- 37 , 40) is obtained for κb/ κγ .
AB - Searches for the exclusive decays of Higgs and Z bosons into a vector quarkonium state and a photon are performed in the μ+μ-γ final state with a proton–proton collision data sample corresponding to an integrated luminosity of 139 fb - 1 collected at s=13 TeV with the ATLAS detector at the CERN Large Hadron Collider. The observed data are compatible with the expected backgrounds. The 95% confidence-level upper limits on the branching fractions of the Higgs boson decays into J/ψγ , ψ(2S)γ , and Υ(1S,2S,3S)γ are found to be 2.0 × 10 - 4 , 10.5 × 10 - 4 , and (2.5 , 4.2 , 3.4) × 10 - 4 , respectively, assuming Standard Model production of the Higgs boson. The corresponding 95% CL upper limits on the branching fractions of the Z boson decays are 1.2 × 10 - 6 , 2.4 × 10 - 6 , and (1.1 , 1.3 , 2.4) × 10 - 6 . An observed 95% CL interval of (- 133 , 175) is obtained for the κc/ κγ ratio of Higgs boson coupling modifiers, and a 95% CL interval of (- 37 , 40) is obtained for κb/ κγ .
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U2 - 10.1140/epjc/s10052-023-11869-1
DO - 10.1140/epjc/s10052-023-11869-1
M3 - Article
AN - SCOPUS:85170271867
SN - 1434-6044
VL - 83
JO - European Physical Journal C
JF - European Physical Journal C
IS - 9
M1 - 781
ER -