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Title: NRQCD Confronts LHCb Data on Quarkonium Production within Jets

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
USDOE
OSTI Identifier:
1371808
Grant/Contract Number:
FG02-05ER41368
Resource Type:
Journal Article: Publisher's Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 119; Journal Issue: 3; Related Information: CHORUS Timestamp: 2017-07-18 22:12:42; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English

Citation Formats

Bain, Reggie, Makris, Yiannis, Mehen, Thomas, Dai, Lin, and Leibovich, Adam K. NRQCD Confronts LHCb Data on Quarkonium Production within Jets. United States: N. p., 2017. Web. doi:10.1103/PhysRevLett.119.032002.
Bain, Reggie, Makris, Yiannis, Mehen, Thomas, Dai, Lin, & Leibovich, Adam K. NRQCD Confronts LHCb Data on Quarkonium Production within Jets. United States. doi:10.1103/PhysRevLett.119.032002.
Bain, Reggie, Makris, Yiannis, Mehen, Thomas, Dai, Lin, and Leibovich, Adam K. Tue . "NRQCD Confronts LHCb Data on Quarkonium Production within Jets". United States. doi:10.1103/PhysRevLett.119.032002.
@article{osti_1371808,
title = {NRQCD Confronts LHCb Data on Quarkonium Production within Jets},
author = {Bain, Reggie and Makris, Yiannis and Mehen, Thomas and Dai, Lin and Leibovich, Adam K.},
abstractNote = {},
doi = {10.1103/PhysRevLett.119.032002},
journal = {Physical Review Letters},
number = 3,
volume = 119,
place = {United States},
year = {Tue Jul 18 00:00:00 EDT 2017},
month = {Tue Jul 18 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on July 18, 2018
Publisher's Accepted Manuscript

Citation Metrics:
Cited by: 2works
Citation information provided by
Web of Science

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  • We discuss factorization in heavy quarkonium production in high energy collisions using NRQCD. Infrared divergences at NNLO are not matched by conventional NRQCD matrix elements. However, we show that gauge invariance and factorization require that conventional NRQCD production matrix elements be modified to include Wilson lines or non-abelian gauge links. With this modification NRQCD factorization for heavy quarkonium production is restored at NNLO.
  • Numerical simulations of the quarkonium spin splittings are done in the framework of lattice nonrelativistic quantum chromodynamics. At leading order in the velocity expansion the spin splittings are of O(M{sub Q}v{sup 4}), where M{sub Q} is the renormalized quark mass and v{sup 2} is the mean squared quark velocity (v{sub {psi}}{sup 2}{approx}0.3 and v{sub {Upsilon}}{sup 2}{approx}0.1). A systematic analysis is done of all next-to-leading order corrections. This includes the addition of O(M{sub Q}v{sup 6}) relativistic interactions, and the removal of O(a{sup 2}M{sub Q}v{sup 4}) discretization errors in the leading-order interactions. Simulations are done for both S- and P-wave mesons, withmore » a variety of heavy quark actions and over a wide range of lattice spacings. Two prescriptions for the tadpole improvement of the action are also studied in detail: one using the measured value of the average plaquette, the other using the mean link measured in the Landau gauge. Next-to-leading order interactions result in a very large reduction in the charmonium splittings, down by about 60{percent} from their values at leading order. There are further indications that the velocity expansion may be poorly convergent for charmonium. Preliminary results show a small correction to the hyperfine splitting in the {Upsilon} system. {copyright} {ital 1997} {ital The American Physical Society}« less
  • Within the dispersive approach to the amplitude of the rare decay {pi}{sup 0}{yields}e{sup +}e{sup -} the nontrivial dynamics is contained only in the subtraction constant. We express this constant, in the leading order in (m{sub e}/{lambda}){sup 2} perturbative series, in terms of the inverse moment of the pion transition form factor given in symmetric kinematics. By using the CELLO and CLEO data on the pion transition form factor given in asymmetric kinematics, the lower bound of the decay branching ratio is found. The restrictions following from QCD allow us to make a quantitative prediction for the branching B({pi}{sup 0}{yields}e{sup +}e{supmore » -})=(6.2{+-}0.1){center_dot}10{sup -8} which is 3{sigma} below the recent KTeV measurement. We confirm our prediction by using the quark models and phenomenological approaches based on the vector meson dominance. The decays {eta}{yields}l{sup +}l{sup -} are also discussed.« less
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