Relativistic corrections to gluon fragmentation into spin-tripletS-wave quarkonium
نویسندگان
چکیده
منابع مشابه
Gluon fragmentation into spin-triplet S-wave quarkonium.
The leading color-singlet contribution to the fragmentation function for a gluon to split into spin-triplet S-wave quarkonium is presented. In the case of charmonium, we find that this color-singlet term is always negligible compared to the leading color-octet contribution. The dominant mechanism for the production of heavy quarkonium at sufficiently large transverse momentum is parton fragment...
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The fragmentation functions for gluons to split into P-wave heavy quarkonium states are calculated to leading order in the QCD coupling constant. Long-distance effects are factored into two nonperturbative parameters: the derivative of the radial wavefunction at the origin and a second parameter related to the probability for a heavy-quark-antiquark pair that is produced in a color-octet S-wave...
متن کاملGluon fragmentation into heavy quarkonium.
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 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 کاملRelativistic Effects in S-wave Quarkonium Decays
The decay widths of S-wave quarkonia (ηc, ηb → γγ and J/ψ,Υ → ee) are calculated on the basis of a quasipotential approach. The nontrivial dependence on relative quark motion of decay amplitude is taken into consideration via quarkonium wave function. It is shown that relativistic corrections may be large (10-50 %) and comparable with QCD corrections.
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ژورنال
عنوان ژورنال: Physical Review D
سال: 2004
ISSN: 1550-7998,1550-2368
DOI: 10.1103/physrevd.69.054003