Search for Higgs and Z Boson Decays to J/ψ γ and Υ(nS) γ with the ATLAS Detector

Aad, G. and Abbott, B. and Abdallah, J. and Khalek, S. A. and Abdinov, O. and Krasznahorkay, Attila and Nagai, Yoshikazu and Pásztor, Gabriella and Tóth, József (2015) Search for Higgs and Z Boson Decays to J/ψ γ and Υ(nS) γ with the ATLAS Detector. PHYSICAL REVIEW LETTERS, 114 (12). ISSN 0031-9007

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Abstract

A search for the decays of the Higgs and Z bosons to J/ψ γ and Υ(nS) γ (n = 1, 2, 3) is performed with pp collision data samples corresponding to integrated luminosities of up to 20.3 fb−1 collected at √s = 8 TeV with the ATLAS detector at the CERN Large Hadron Collider. No significant excess of events is observed above expected backgrounds and 95% CL upper limits are placed on the branching fractions. In the J/ψ γ final state the limits are 1.5 × 10−3 and 2.6 × 10−6 for the Higgs and Z boson decays, respectively, while in the Υ(1S, 2S, 3S) γ final states the limits are (1.3, 1.9, 1.3) × 10−3 and (3.4, 6.5, 5.4) × 10−6, respectively.

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