“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 13043
School of Particles and Accelerator
  Title:   Energy spectrum of bottom- and charmed-flavored mesons from polarized top quark decay tuparrowrightarrow W+ + B/D+X at Os)
  Author(s):  Seyed Mohammad Moosavi Nejad
  Status:   Published
  Journal: Phys. Rev. D
  No.:  094011
  Vol.:  88
  Year:  2013
  Supported by:  IPM
  Abstract:
We consider the decay of a polarized top quark into a stable W+ boson and charmed-flavored (D) or bottom-flavored (B) hadrons, via t(↑)→ W++D/B+X. We study the angular distribution of the scaled-energy of B/D-hadrons at next-to-leading order ( NLO ) considering the contribution of bottom and gluon fragmentations into the heavy mesons B and D. To obtain the energy spectrum of B/D-hadrons we present our analytical expressions for the parton-level differential decay widths of t(↑)→ b+W+(+g) at NLO. Comparison of our predictions with data at the LHC enable us to test the universality and scaling violations of the B- and D-hadron fragmentation functions (FFs). These can also be used to determine the polarization states of top quarks and since the energy distributions depend on the ratio mW /mt we advocate the use of such angular decay measurements for the determination of the top quark�??s mass

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