Search for Higgs Boson Decay to a Charm Quark-Antiquark Pair in Proton-Proton Collisions at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Bury, Florian;CMS;et.al.
(2023) Physical Review Letters — Vol. 131 (2023)

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Authors
  • Benecke, AnnaUCLouvain
    Author
  • Bethani, Agniorcid-logoUCLouvain
    Author
  • Bruno, GiacomoUCLouvain
    Author
  • Bury, FlorianUCLouvain
    Author
  • Caputo, ClaudioUCLouvain
    Author
  • David, PieterUCLouvain
    Author
  • Delaere, Christopheorcid-logoUCLouvain
    Author
  • Donertas, Izzeddin SuatUCLouvain
    Author
  • Giammanco, AndreaUCLouvain
    Author
  • Jaffel, KhawlaUCLouvain
    Author
  • Jain, SandhyaUCLouvain
    Author
  • Jain, SandhyaUCLouvain
    Author
  • Lemaitre, VincentUCLouvain
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  • Mondal, KuntalUCLouvain
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  • Prisciandaro, JessicaUCLouvain
    Author
  • Taliercio, AngelaUCLouvain
    Author
  • Tran, Tu ThongUCLouvain
    Author
  • Vischia, PietroUCLouvain
    Author
  • Wertz, SébastienUCLouvain
    Author
  • CMS
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  • et. al.
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Abstract
A search for the standard model Higgs boson decaying to a charm quark-antiquark pair, <math display="inline"><mrow><mi>H</mi><mo stretchy="false">→</mo><mi>c</mi><mover accent="true"><mrow><mi>c</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover></mrow></math>, produced in association with a leptonically decaying <math display="inline"><mrow><mi>V</mi></mrow></math> (<math display="inline"><mi>W</mi></math> or <math display="inline"><mi>Z</mi></math>) boson is presented. The search is performed with proton-proton collisions at <math display="inline"><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math> collected by the CMS experiment, corresponding to an integrated luminosity of <math display="inline"><mn>138</mn><mtext> </mtext><mtext> </mtext><msup><mi>fb</mi><mrow><mo>-</mo><mn>1</mn></mrow></msup></math>. Novel charm jet identification and analysis methods using machine learning techniques are employed. The analysis is validated by searching for <math display="inline"><mi>Z</mi><mo stretchy="false">→</mo><mi>c</mi><mover accent="true"><mi>c</mi><mo stretchy="false">¯</mo></mover></math> in <math display="inline"><mrow><mi>V</mi></mrow><mi>Z</mi></math> events, leading to its first observation at a hadron collider with a significance of 5.7 standard deviations. The observed (expected) upper limit on <math display="inline"><mrow><mi>σ</mi><mo stretchy="false">(</mo><mi>V</mi><mi>H</mi><mo stretchy="false">)</mo><mi mathvariant="script">B</mi><mo stretchy="false">(</mo><mi>H</mi><mo>→</mo><mi>c</mi><mover accent="true"><mrow><mi>c</mi></mrow><mrow><mo stretchy="false">¯</mo></mrow></mover><mo stretchy="false">)</mo></mrow></math> is 0.94 (<math display="inline"><mrow><msubsup><mrow><mn>0.50</mn></mrow><mrow><mo>-</mo><mn>0.15</mn></mrow><mrow><mo>+</mo><mn>0.22</mn></mrow></msubsup></mrow></math>)pb at 95% confidence level (C.L.), corresponding to 14 (<math display="inline"><msubsup><mn>7.6</mn><mrow><mo>-</mo><mn>2.3</mn></mrow><mrow><mo>+</mo><mn>3.4</mn></mrow></msubsup></math>) times the standard model prediction. For the Higgs-charm Yukawa coupling modifier, <math display="inline"><msub><mi>κ</mi><mi>c</mi></msub></math>, the observed (expected) 95% C.L. interval is <math display="inline"><mrow><mn>1.1</mn><mo>&lt;</mo><mo stretchy="false">|</mo><msub><mrow><mi>κ</mi></mrow><mrow><mi>c</mi></mrow></msub><mo stretchy="false">|</mo><mo>&lt;</mo><mn>5.5</mn></mrow></math> (<math display="inline"><mo stretchy="false">|</mo><msub><mi>κ</mi><mi>c</mi></msub><mo stretchy="false">|</mo><mo>&lt;</mo><mn>3.4</mn></math>), the most stringent constraint to date.
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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., Jain, S., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Tran, T. T., Vischia, P., Wertz, S., et al. (2023). Search for Higgs Boson Decay to a Charm Quark-Antiquark Pair in Proton-Proton Collisions at <math display=“inline”><msqrt><mi>s</mi></msqrt><mo>=</mo><mn>13</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></math>. Physical Review Letters, 131. https://doi.org/10.1103/PhysRevLett.131.061801 (Original work published 2023)