منابع مشابه
THE ROLE OF QUARK POLARIZATION IN HEAVY QUARK FRAGMENTATION
We calculate the exact fragmentation functions for c and b quark fragmentation taking into account the spin orientation of the initial heavy quark in the form of analytical and rather simple expressions. Our calculations show that spin orientation may have an important effect on the fragmentation spectrum. This effect is more striking in the cases of c ?D, D*; c? ? , ? , and ?B , B *.
متن کاملHeavy-Quark Fragmentation
We study perturbative and non-perturbative aspects of heavy-quark fragmentation into hadrons, emphasizing the large-x region, where x is the energy fraction of the detected hadron. We first prove that when the moment index N and the quark mass m get large simultaneously with the ratio NΛ/m fixed, the fragmentation function depends on this ratio alone. This opens up the way to formulate the non-...
متن کاملQuark fragmentation into 3PJ quarkonium.
We calculate the functions of parton fragmentation into 3 P J quarkonium at order 2 s , where the parton can be a heavy or light quark. The obtained functions explicitly satisfy the Altarelli-Parisi equation and they are divergent, behaving as z 1 near z = 0. However, if one choses the renormalization scale as twice of the heavy quark mass, the fragmentation functions are regular over the whole...
متن کاملSpectroscopy and Charm Quark Fragmentation
The large data sample accumulated at the KEKB storage ring allows for dedicated analysis in charm spectroscopy. This made the first observations of e.g. the broad D∗∗ resonances in B decays as well as other processes possible. The observation of the DsJ(2317) resonances are confirmed and indications of their quantum numbers are given. The fragmentation function for D has been measured with unpr...
متن کاملInvestigations of Quark Fragmentation Universality
We propose event cuts in deep inelastic scattering, suitable for an examination of quark fragmentation universality. We compare the current hemisphere of the Breit frame with hemispheres in ee annihilation events, using Monte Carlo simulations. The agreement between the two processes is improved after the suggested events cuts. A method to study the scale evolution in quark hemispheres using da...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1996
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.53.1185