Heavy quark fragmentation to polarised quarkonium
نویسندگان
چکیده
منابع مشابه
Heavy Quark Fragmentation to Polarised Quarkonium
We calculate the polarisation of $‘s and T’s produced by the fragmentation of heavy quarks. We find that fragmentation to transversely al igned quarkonium is very slightly enhanced relative to longitudinally polarised. This net al ignment corresponds to a 5% asymmetry in the angular distribution of leptons produced in the subsequent decay of the quarkonium. We point out that the leading gluon _...
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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...
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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 *.
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The dominant production mechanism for heavy quark-antiquark bound states in very high energy processes is fragmentation, the splitting of a high energy parton into a quarkonium state and other partons. We show that the fragmentation functions D(z, μ) describing these processes can be calculated using perturbative QCD. We calculate the fragmentation functions for a gluon to split into S-wave qua...
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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-...
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ژورنال
عنوان ژورنال: Physics Letters B
سال: 1993
ISSN: 0370-2693
DOI: 10.1016/0370-2693(93)90986-r