Inclusive quarkonium decays
نویسندگان
چکیده
منابع مشابه
Inclusive Quarkonium Decays
I review recent progress in the calculation of inclusive quarkonium decays in the framework of QCD nonrela-tivistic effective field theories and in relation to the experimental measurements.
متن کاملNew Results on Inclusive Quarkonium Decays
Considered as bound states, heavy quarkonia (e.g. Υ, χb, ψ, χc, ...) have two main characteristics: 1) a mass scale, which is in the perturbative regime: mb ≃ 5 GeV, mc ≃ 1.5 GeV; 2) level splittings of a relative size that is typical of non-relativistic systems. Being non-relativistic bound states, heavy quarkonia are characterized by at least three hierarchically ordered energy scales: the ha...
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In recent years, the study of heavy quarkonia (bb̄, cc̄, ...) has gone through several theoretical and experimental advances. From the theoretical side the introduction of non-relativistic effective field theories (EFTs) of QCD has put our description of these systems on the solid ground of QCD. It has made it possible, in the case of several observables, to factorize the high-energy dynamics int...
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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...
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Heavy quarkonia (charmonium, bottomonium, ...) provide an ideal set of observables to probe properties of low-energy QCD in a controlled way. The reason is the following. Heavy quarkonia are non-relativistic bound states and, therefore, characterized by a set of energy scales hierarchically ordered: m, mv, mv, ... where m is the heavy-quark mass and v ≪ 1 the relative heavy-quark velocity. For ...
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ژورنال
عنوان ژورنال: Nuclear Physics B - Proceedings Supplements
سال: 2004
ISSN: 0920-5632
DOI: 10.1016/j.nuclphysbps.2004.04.165