QCD radiative correction to color-octet J/{psi} inclusive production at B factories

Journal Article · Mon Feb 01 00:00:00 EST 2010 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.81.034015· OSTI ID:21409170

Yujie, Zhang ^[1]; Yanqing, Ma; Kai, Wang ^[1]; Kuangta, Chao ^[1]

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1. Department of Physics and State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing 100871 (China)

In nonrelativistic quantum chromodynamics (NRQCD), we study the next-to-leading order (NLO) QCD radiative correction to the color-octet J/{psi} inclusive production at B factories. Compared with the leading-order (LO) result, the NLO QCD corrections are found to enhance the short-distance coefficients in the color-octet J/{psi} production e{sup +}e{sup -{yields}}cc({sup 1}S{sub 0}{sup (8)} or {sup 3}P{sub J}{sup (8)})g (with J=0, 1, 2) by a factor of about 1.9. Moreover, the peak at the end point in the J/{psi} energy distribution predicted at LO can be smeared by the NLO corrections, but the major color-octet contribution still comes from the large energy region of J/{psi}. By fitting the latest data of {sigma}(e{sup +}e{sup -{yields}}J/{psi}+X{sub non-cc}) observed by Belle, we find that the values of color-octet matrix elements are much smaller than expected earlier by using the naive velocity scaling rules or extracted from fitting experimental data with LO calculations. As the most stringent constraint by setting the color-singlet contribution to be zero in e{sup +}e{sup -{yields}}J/{psi}+X{sub non-cc}, we get an upper limit of the color-octet matrix element, <0|O{sup J/{psi}[1S{sub 0}{sup (8)}]}|0>+4.0<0|O{sup J/{psi}[3P{sub 0}{sup (8)}]}|0>/m{sub c}{sup 2}<(2.0{+-}0.6)x10{sup -2} GeV{sup 3} at NLO in {alpha}{sub s}.

• OSTI ID: 21409170
• Journal Information: Physical Review. D, Particles Fields, Vol. 81, Issue 3; Other Information: DOI: 10.1103/PhysRevD.81.034015; (c) 2010 The American Physical Society; ISSN 0556-2821
• Country of Publication: United States
• Language: English

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