Annihilation rate of heavy P-wave quarkonium in relativistic Salpeter method
نویسندگان
چکیده
منابع مشابه
Gluon fragmentation into P-wave heavy quarkonium.
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...
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Hadronic annihilation decay rates of P-wave heavy quarkonia are given to nextto-leading order in both αs and v 2. They include ten nonperturbative parameters, which can be rigorously defined as the matrix elements of color-singlet and coloroctet operators in NRQCD. We expect these papameters will be determined from lattice calculations in future. PACS number(s): 13.25.Gv, 12.38.Bx BBL (Bodwin, ...
متن کاملCorrections to Heavy-Quarkonium Creation and Annihilation
In the framework of nonrelativistic QCD, we compute the leading double-logarithmic corrections of order αs ln (1/αs) to the heavy-quark-antiquark bound-state wave function at the origin, which determines the production and annihilation rates of heavy quarkonia. The phenomenological implications for the top-antitop and Υ systems are discussed. PACS numbers: 12.38.Bx, 12.39.Jh, 14.40.Gx ∗Permanen...
متن کاملNew predictions for inclusive heavy-quarkonium P-wave decays.
We show that some nonrelativistic quantum chromodynamics color-octet matrix elements can be written in terms of (derivatives of) wave functions at the origin and of nonperturbative universal constants once the factorization between the soft and ultrasoft scales is achieved by using an effective field theory where only ultrasoft degrees of freedom are kept as dynamical entities. This allows us t...
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: Physics Letters B
سال: 2007
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2007.08.017