HadronicJψproduction calculated in the NRQCD factorization formalism
نویسندگان
چکیده
منابع مشابه
Quarkonium Polarization in the Nrqcd Factorization Framework∗
The NRQCD factorization approach for calculating inclusive production of heavy quarkonium gives unambiguous predictions for the polarization of quarkonium states. The factorization formula for polarized states can be obtained by using the threshold expansion method to calculate the short-distance coefficients and then using symmetries of NRQD to reduce the NRQCD matrix elements. A particularly ...
متن کاملNRQCD Factorization and Universality of NRQCD Matrix Elements
The approach of nonrelativistic QCD(NRQCD) factorization was proposed to study inclusive production of a quarkonium. It is widely used and successful. However, a recent study of gluon fragmentation into a quarkonium at two-loop level shows that the factorization is broken. It is suggested that the color-octet NRQCD matrix elements should be modified by adding a gauge link to restore the factori...
متن کاملDecay rates of Quarkonia in the NRQCD formalism
The mesonic states are not only identified with their masses but also with their leptonic and other decay rates. So, one of the tests for the success of any theoretical model for mesons is the correct prediction of their decay rates. Many theoretical models predict the masses correctly but overestimate the decay rates [1,2,3,4,5,6]. For better estimations with reference to the experimental valu...
متن کاملFragmentation, NRQCD and NNLO Factorization Analysis in Heavy Quarkonium Production
We discuss heavy quarkonium production through parton fragmentation, including a review of arguments for the factorization of high-pT particles into fragmentation functions for hadronic initial states. We investigate the further factorization of fragmentation functions in the NRQCD formalism, and argue that this requires a modification of NRQCD octet production matrix elements to include nonabe...
متن کاملIntroduction to the Nrqcd Factorization Approach to Heavy Quarkonium
I present an introduction to the NRQCD factorization method for calculating annihilation rates and inclusive production rates for heavy quarkonium. Using this method, annihilation decay rates and sufficiently inclusive cross sections are factored into long-distance NRQCD matrix elements and perturbative short-distance coefficients. I derive the velocity-scaling rules that are used to estimate t...
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ژورنال
عنوان ژورنال: Physical Review D
سال: 1996
ISSN: 0556-2821,1089-4918
DOI: 10.1103/physrevd.54.3608