1. Search for flavour-changing neutral tqH interactions with H → γγ in pp collisions at s = 13 TeV using the ATLAS detector.
- Author
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Aad, G., Abbott, B., Abeling, K., Abicht, N. J., Abidi, S. H., Aboulhorma, A., Abramowicz, H., Abreu, H., Abulaiti, Y., Acharya, B. S., Adam Bourdarios, C., Adamczyk, L., Addepalli, S. V., Addison, M. J., Adelman, J., Adiguzel, A., Adye, T., Affolder, A. A., Afik, Y., and Agaras, M. N.
- Subjects
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PROTON-proton interactions , *BRANCHING ratios , *QUARKS , *LARGE Hadron Collider , *TOP quarks , *HIGGS bosons , *DETECTORS , *HADRON-hadron scattering - Abstract
A search for flavour-changing neutral interactions involving the top quark, the Higgs boson and an up-type quark q (q = c, u) is presented. The proton-proton collision data set used, with an integrated luminosity of 139 fb−1, was collected at s = 13 TeV by the ATLAS experiment at the Large Hadron Collider. Both the decay process t → qH in t t ¯ production and the production process pp → tH, with the Higgs boson decaying into two photons, are investigated. No significant excess is observed and upper limits are set on the t → cH and the t → uH branching ratios of 4.3 × 10−4 and 3.8 × 10−4, respectively, at the 95% confidence level, while the expected limits in the absence of signal are 4.7 × 10−4 and 3.9 × 10−4. Combining this search with ATLAS searches in the H → τ+τ− and H → b b ¯ final states yields observed (expected) upper limits on the t → cH branching ratio of 5.8 × 10−4 (3.0 × 10−4) at the 95% confidence level. The corresponding observed (expected) upper limit on the t → uH branching ratio is 4.0 × 10−4 (2.4 × 10−4). [ABSTRACT FROM AUTHOR]
- Published
- 2023
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