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Υ decay to two charm-quark jets as a probe of the color-octet mechanism

Υ decay to two charm-quark jets as a probe of the color-octet mechanism We calculate the decay rate of bottomonium to two charm-quark jets Υ → c c ¯ at the tree level and one-loop level including color-singlet and color-octet b b ¯ 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 Υ decay, the result can be used to test the color-octet mechanism or give a strong constraint on the color-octet matrix elements. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review D American Physical Society (APS)

Υ decay to two charm-quark jets as a probe of the color-octet mechanism

Physical Review D , Volume 78 (9) – Nov 1, 2008
13 pages

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Publisher
American Physical Society (APS)
Copyright
Copyright © 2008 The American Physical Society
ISSN
1550-2368
DOI
10.1103/PhysRevD.78.094017
Publisher site
See Article on Publisher Site

Abstract

We calculate the decay rate of bottomonium to two charm-quark jets Υ → c c ¯ at the tree level and one-loop level including color-singlet and color-octet b b ¯ 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 Υ decay, the result can be used to test the color-octet mechanism or give a strong constraint on the color-octet matrix elements.

Journal

Physical Review DAmerican Physical Society (APS)

Published: Nov 1, 2008

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