{upsilon} decay to two charm-quark jets as a probe of the color-octet mechanism

Journal Article · Sat Nov 01 04:00:00 EDT 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.094017· OSTI ID:21254622

Yujie, Zhang ^[1]; Kuangta, Chao ^[1]

---

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

We calculate the decay rate of bottomonium to two charm-quark jets {upsilon}{yields}cc at the tree level and one-loop level including color-singlet and color-octet bb annihilations. We find that the short-distance coefficient of the color-octet piece is much larger than the color-singlet piece, and that the QCD correction will change the end point behavior of the charm quark jet. The color-singlet piece is strongly affected by the one-loop QCD correction. In contrast, the QCD correction to the color-octet piece is weak. Once the experiment can measure the branching ratio and energy distribution of the two charm-quark jets in the {upsilon} decay, the result can be used to test the color-octet mechanism or give a strong constraint on the color-octet matrix elements.

• OSTI ID: 21254622
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 78; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ANNIHILATION
BOTTOMONIUM
BRANCHING RATIO
CHARM PARTICLES
COLOR MODEL
CORRECTIONS
ENERGY SPECTRA
MATRIX ELEMENTS
OCTET MODEL
PARTICLE DECAY
QUANTUM CHROMODYNAMICS
QUARKS