Signatures of Color-octet Quarkonium Production A
نویسنده
چکیده
I briefly review the nonrelativistic QCD picture of quarkonium production and its confrontation with experiment in various production processes.
منابع مشابه
Quarkonium Production at Z and in Υ(1s) Decay
The conventional color-singlet model was challenged by the recent data on quarkonium production. Discrepancies in production rates were observed at the Tevatron, at LEP, and in fixed-target experiments. The newly advocated color-octet mechanism provides a plausible solution to the anomalous quarkonium production observed at the Tevatron. The color-octet mechanism should also affect other quarko...
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 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 کاملNon-relativistic Effective Theory for Quarkonium Production in Hadron Collisions
I review recent progress in understanding inclusive quarkonium production in hadron collisions. The rst part focuses on non-relativistic QCD as an e ective theory. I discuss its di erences from and similarities with e ective theories describing bound states of a single heavy quark, as far as matching calculations beyond tree-level and power counting are concerned. The second part summarizes pre...
متن کاملΥ decay into charmonium and the color octet mechanism
A factorization theorem for P -wave quarkonium production, recently derived by Bodwin, Braaten, Yuan and Lepage, is applied to Υ → χcJ +X, where χcJ labels the PJ charmonium states. The widths for χcJ production through color-singlet P -wave and color-octet S-wave cc̄ subprocesses are computed each to leading order in αs. Experimental data on Υ → J/ψ+X is used to obtain an upper bound on a nonpe...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1996