“School of Particles And Accelerator”
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| Paper IPM / Particles And Accelerator / 14317 |
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| Abstract: | |||||
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We present the analytical expressions for the next-to-leading order corrections to the partial decay
width t(â) â bW+, followed by b â H_bX, for nonzero b-quark mass (mbâ 0) in the fixed-flavor-number scheme (FFNs).
To make the predictions for the energy distribution of outgoing hadrons H_b, as a function of the normalized H_b-energy fraction xH, we apply the general-mass variable-flavor-number scheme (GM-VFNs) in a specific helicity coordinate system where the polarization of top quark is evaluated relative to the b-quark momentum. We also study the effects of gluon fragmentation and finite hadron mass on the hadron energy spectrum so that hadron masses are responsible for the low-xH threshold. In order to describe both the b-quark and the gluon hadronizations in top
decays we apply realistic and nonperturbative fragmentation functions extracted through a global fit to e+eâ annihilation data from CERN LEP1 and SLAC SLC by relying on their universality and scaling violations.
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