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Using CalcHEP package to study Higgs boson decay

Learn about CalcHEP package features, such as tree-level processes and quick production calculations. Discover Higgs boson decay modes based on its mass range. Find out limitations and benefits of using CalcHEP for studying particle decay processes.

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Using CalcHEP package to study Higgs boson decay

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  1. Using CalcHEP package to study Higgs boson decay By Hosam M.Abd Elazeem B.Sc, Beni-Sueif University

  2. Some features of CalcHEP package • Any process within any model: decay and scattering. • Tree-level processes. • Squared matrix element calculation but with no spin information for outgoing particles – spin averaged amplitude • Very quick for 2-2 production or width calculations • Straightforward to enter new models, CalcHEP and related CompHEP used as core for several other programs.

  3. Limitations of CalcHEP package • Limit on number of external legs (involved particles) and number of diagrams official limit – 6 ,, unofficial – none • limit set from the practical point: 2 -> 6 (1->7) : is the essential time limit • number of diagrams ~ 100-200: time and disk-space limit

  4. The Decay Modes of the Higgs Boson The possible decay modes of the Higgs boson are essentially determined by the value of its mass. • When the Higgs boson mass lies in the range 95 Gev< Mh<130Gev , the Higgs is quite narrow Γh<10 MeV and the main branching ratios come from the heaviest fermions that are accessible kinematically (b,B), followed by (l,L), then (c,C )

  5. The Decay Modes of the Higgs Boson • For a heavier Higgs, i.e. Mh>130 GeV, the vector boson channels h VV* with V=W,Z are dominant. • Finally, for the total decay width, the Higgs boson is very narrow in the low mass range, Γh< 10 MeV, but the width becomes rapidly wider for masses larger than 130 GeV, reaching ∼ 1 GeV slightly above the ZZ threshold.

  6. THANK YOU

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