“School of Particles”
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| Paper IPM / Particles / 13043 |
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| Abstract: | |
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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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