The soft function for color octet production at threshold
نویسندگان
چکیده
منابع مشابه
Color - Octet ψ ′ Production at Low p ⊥
We study contributions from color-octet quarkonium formation mechanisms to p ⊥-integrated ψ ′ production cross sections in pion-nucleon reactions. The observed polarization of the ψ ′ is not reproduced by the lowest-order leading-twist color-singlet and color-octet mechanisms. This suggests that there are important quarkonium production mechanisms beyond leading twist.
متن کاملColor - Octet $ ’ Production at Low pl
We study contributions from color-octet quarkonium formation mechanisms to pl-integrated $' production cross sections in pion-nucleon reactions. The observed polarization of the +' is not reproduced by the lowest-order leading-twist color-singlet and color-octet mechanisms. This suggests that there are important quarkonium production mechanisms beyond leading twist.
متن کاملColor-octet quarkonia production.
Gluon fragmentation represents the dominant source of high energy prompt quarkonia at hadron colliders. Fragmentation approximations break down, however, when a quarkonium’s transverse momentum becomes comparable to its mass. In this paper, we identify a large class of color-octet diagrams that mediate quarkonia production at all energies and reduce to the dominant set of gluon fragmentation gr...
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We calculate the lowest order hadronic cross sections for producing colored heavy quark-antiquark pairs in L = S = 0 and L = S = 1 configurations. Such QQ[S (8) 0 ] and QQ[P (8) J ] states hadronize into ψQ quarkonia at the same order in the NRQCD velocity expansion as previously considered QQ[S (8) 1 ] pairs. Their contributions to prompt Psi and Upsilon production at the Tevatron bring the sh...
متن کاملThe Soft Gluon Emission Process in the Color-Octet Model for Heavy Quarkonium Production
The Color-Octet Model has been used successfully to analyze many problems in heavy quarkonium production. We examine some of the conceptual and practical problems of the soft gluon emission process in the Color-Octet Model. We use a potential model to describe the initial and final states in the soft gluon emission process, as the emission occurs at a late stage after the production of the heav...
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ژورنال
عنوان ژورنال: Nuclear Physics B
سال: 2014
ISSN: 0550-3213
DOI: 10.1016/j.nuclphysb.2013.12.008