Search for Flavor-Changing Neutral Current Interactions of the Top Quark and Higgs Boson in Final States with Two Photons in Proton-Proton Collisions at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$
(2022) Physical Review Letters — Vol. 129 (2022)
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- Proton-proton interactions resulting in final states with two photons are studied in a search for the signature of flavor-changing neutral current interactions of top quarks (<math display="inline"><mrow><mi>t</mi></mrow></math>) and Higgs bosons (<math display="inline"><mrow><mi>H</mi></mrow></math>). The analysis is based on data collected at a center-of-mass energy of 13 TeV with the CMS detector at the LHC, corresponding to an integrated luminosity of <math display="inline"><mrow><mn>137</mn><mtext> </mtext><mtext> </mtext><msup><mrow><mi>fb</mi></mrow><mrow><mo>-</mo><mn>1</mn></mrow></msup></mrow></math>. No significant excess above the background prediction is observed. Upper limits on the branching fractions (<math display="inline"><mi mathvariant="script">B</mi></math>) of the top quark decaying to a Higgs boson and an up (<math display="inline"><mrow><mi>u</mi></mrow></math>) or charm (<math display="inline"><mrow><mi>c</mi></mrow></math>) quark are derived through a binned fit to the diphoton invariant mass spectrum. The observed (expected) 95% confidence level upper limits are found to be 0.019% (0.031%) for <math display="inline"><mrow><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><mi>t</mi><mo stretchy="false">→</mo><mi>H</mi><mi>u</mi><mo stretchy="false">)</mo></mrow></math> and 0.073% (0.051%) for <math display="inline"><mrow><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><mi>t</mi><mo stretchy="false">→</mo><mi>H</mi><mi>c</mi><mo stretchy="false">)</mo></mrow></math>. These are the strictest upper limits yet determined.
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Benecke, A., Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Jaffel, K., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Tran, T. T., Vischia, P., Wertz, S., et al. (2022). Search for Flavor-Changing Neutral Current Interactions of the Top Quark and Higgs Boson in Final States with Two Photons in Proton-Proton Collisions at $\sqrt{s}=13\text{ }\text{ }\mathrm{TeV}$. Physical Review Letters, 129. https://doi.org/10.1103/PhysRevLett.129.032001 (Original work published 2022)