Document Type : Research Paper
Author
Department of Physics, Faculty of Science, Razi University, P.O.Box: 6714967346, Kermanshah - Iran
Abstract
In the CMS detector, the branching fractions of Higgs boson to J/ψ(1S) and cc pairs have been measured equal to 1.8×10-3 and 2.89 × 10-2, respectively. Theoretically, one possible scenario for direct production J/ψ(1S) is that the Higgs boson initially decays into the pair of cc . Then, in the next step, each of the c and c directly fragments into J/ψ(1S) a meson. Based on this scenario, in this paper, the direct branching fractions of the standard model Higgs boson to J/ψ(1S) is calculated by direct fragmentation of c and c using of perturbative Quantum-Chromodynamics(pQCD) and also taking account the longitudinal and transverse polarization states J/ψ(1S). The results of our calculations for the direct branching fraction of the Higgs boson to a pair J/ψ(1S) equal to 1.562×10-3, agree well with the measured value in the CMS detector. Therefore, it can be concluded that the predominant contribution in the decay of the Higgs boson into the J/ψ(1S) meson is the direct fragment of c quark and antiquark c.
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