Constraints on the Higgs boson self-coupling from the combination of single and double Higgs boson production in proton-proton collisions at <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>

Benecke, Anna;Bethani, Agni;Bruno, Giacomo;Caputo, Claudio;CMS;et.al.
(2025) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 861 (2025)

Files

e8a7b798adbe5eada8a931f1345f5295.pdf
  • Open Access
  • Adobe PDF
  • 689.84 KB
Download

Details

Authors
Show more
Abstract
The Higgs boson (H) trilinear self-coupling, <math altimg="si2.svg"><msub><mrow><mi>λ</mi></mrow><mrow><mn>3</mn></mrow></msub></math>, is constrained via its measured properties and limits on the HH pair production using the proton-proton collision data collected by the CMS experiment at <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn><mspace width="0.2em"/><mtext>TeV</mtext></math>. The combination of event categories enriched in single-H and HH events is used to measure <math altimg="si3.svg"><msub><mrow><mi>κ</mi></mrow><mrow><mi>λ</mi></mrow></msub></math>, defined as the value of <math altimg="si2.svg"><msub><mrow><mi>λ</mi></mrow><mrow><mn>3</mn></mrow></msub></math> normalized to its standard model prediction, while simultaneously constraining the Higgs boson couplings to fermions and vector bosons. Values of <math altimg="si3.svg"><msub><mrow><mi>κ</mi></mrow><mrow><mi>λ</mi></mrow></msub></math> outside the interval <math altimg="si4.svg"><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1.2</mn><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><msub><mrow><mi>κ</mi></mrow><mrow><mi>λ</mi></mrow></msub><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><mn>7.5</mn></math> are excluded at 2σ confidence level, which is compatible with the expected range of <math altimg="si5.svg"><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>2.0</mn><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><msub><mrow><mi>κ</mi></mrow><mrow><mi>λ</mi></mrow></msub><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><mn>7.7</mn></math> under the assumption that all other Higgs boson couplings are equal to their standard model predicted values. Relaxing the assumption on the Higgs couplings to fermions and vector bosons the observed (expected) <math altimg="si3.svg"><msub><mrow><mi>κ</mi></mrow><mrow><mi>λ</mi></mrow></msub></math> interval is constrained to be within <math altimg="si6.svg"><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>1.4</mn><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><msub><mrow><mi>κ</mi></mrow><mrow><mi>λ</mi></mrow></msub><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><mn>7.8</mn></math> (<math altimg="si7.svg"><mo linebreak="badbreak" linebreakstyle="after">−</mo><mn>2.3</mn><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><msub><mrow><mi>κ</mi></mrow><mrow><mi>λ</mi></mrow></msub><mo linebreak="goodbreak" linebreakstyle="after">&lt;</mo><mn>7.8</mn></math>) at 2σ confidence level.
Affiliations

Citations

  • APA
  • Chicago
  • FWB

Benecke, A., Bethani, A., Bruno, G., Caputo, C., de Favereau de Jeneret, J., Delaere, C., Donertas, I. S., Giammanco, A., Guzel, A. O., Jain, S., Lemaitre, V., Lidrych, J., Mastrapasqua, P., Tran, T. T., Wertz, S., CMS, & et al. (2025). Constraints on the Higgs boson self-coupling from the combination of single and double Higgs boson production in proton-proton collisions at <math altimg=“si1.svg”><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak=“goodbreak” linebreakstyle=“after”>=</mo><mn>13</mn><mspace width=“0.2em”/><mtext>TeV</mtext></math>. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 861. https://doi.org/10.1016/j.physletb.2024.139210 (Original work published 2025)