Fragmentation, factorization and infrared poles in heavy quarkonium production - INSPIRE

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Fragmentation, factorization and infrared poles in heavy quarkonium production

Gouranga C. Nayak
(
- SUNY, Stony Brook
)
,
Jian-Wei Qiu
(
- Iowa State U.
)
,
George F. Sterman
(
- SUNY, Stony Brook
)

Jan, 2005

10 pages

Published in:

Phys.Lett.B 613 (2005) 45-51

e-Print:

hep-ph/0501235 [hep-ph]

DOI:

10.1016/j.physletb.2005.03.031

Report number:

YITP-SB-05-01

View in:

ADS Abstract Service

reference search135 citations

Citations per year

Abstract: (Elsevier)

We explore the role of soft gluon exchange in heavy quarkonium production at large transverse momentum. We find uncanceled infrared poles at NNLO that are not matched by conventional NRQCD matrix elements. We show, however, that gauge invariance and factorization require that conventional NRQCD production operators be modified to include non-Abelian phases or Wilson lines. With appropriately modified operators, factorization is restored at NNLO. We also argue that, in the absence of special cancellations, infrared poles at yet higher orders may require the inclusion of additional nonlocal operators, not present in the NRQCD expansion in relative velocity.

Note:

10 pages latex, 6 eps figures

12.39.St
14.40.Gx
12.38.Bx
13.87.Fh
hadron hadron: inclusive reaction
lepton lepton: inclusive reaction
quarkonium: hadroproduction
quarkonium: electroproduction
quarkonium: heavy
J/psi(3100)

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Figures(0)

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