Research Paper: Direct Decay of The Higgs Boson into Upsilon Meson via Fragmentation

Document Type : Research Paper

Author

Assistant Professor, Department of Physics, Faculty of Science, Razi University, Kermanshah, Iran

Abstract

One of the dominant modes of decay of the standard model Higgs boson is its decay into b  pair. Subsequently, either b or  can fragment directly into the upsilon meson. In this paper, the direct branching fractions of the standard model Higgs boson to the upsilon meson are calculated via direct fragmentation b and  quarks. The results obtained from our calculations show that, the decay ratio of the Higgs boson to the upsilon pair is equal to , which is a very good agreement with the value reported by CMS Collaboration which is equal to  . In addition, the direct decay branching fraction of the Higgs boson to the pair upsilon with longitudinal polarization from our calculations, compare to its decay to the unpolarization upsilon pair, it shows a 13% reduction, which is comparable to the 22% decrease is reported by the CMS Collaboration. Therefore, it can be concluded that the dominant contribution in the decay of the Higgs boson to the upsilon, is the direct fragmentation of the quark b and antiquark .  

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References

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History

  • Receive Date: 13 November 2021
  • Revise Date: 17 January 2022
  • Accept Date: 27 February 2022

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