Abstract
We compute in order αs the nonrelativistic QCD (NRQCD) short-distance coefficients that match quark-antiquark operators of all orders in the heavy-quark velocity v to the electromagnetic current. We employ a new method to compute the one-loop NRQCD contribution to the matching condition. The new method uses full-QCD expressions as a starting point to obtain the NRQCD contribution, thus greatly streamlining the calculation. Our results show that, under a mild constraint on the NRQCD operator matrix elements, the NRQCD velocity expansion for the quark-antiquark-operator contributions to the electromagnetic current converges. The velocity expansion converges rapidly for approximate J/ψ operator matrix elements.
| Original language | English |
|---|---|
| Article number | 014007 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 79 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2009 Jan 5 |
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ASJC Scopus subject areas
- Nuclear and High Energy Physics
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Order-αs corrections to the quarkonium electromagnetic current at all orders in the heavy-quark velocity. / Bodwin, Geoffrey T.; Chung, Hee Sok; Lee, Jungil; Yu, Chaehyun.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 79, No. 1, 014007, 05.01.2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Order-αs corrections to the quarkonium electromagnetic current at all orders in the heavy-quark velocity
AU - Bodwin, Geoffrey T.
AU - Chung, Hee Sok
AU - Lee, Jungil
AU - Yu, Chaehyun
PY - 2009/1/5
Y1 - 2009/1/5
N2 - We compute in order αs the nonrelativistic QCD (NRQCD) short-distance coefficients that match quark-antiquark operators of all orders in the heavy-quark velocity v to the electromagnetic current. We employ a new method to compute the one-loop NRQCD contribution to the matching condition. The new method uses full-QCD expressions as a starting point to obtain the NRQCD contribution, thus greatly streamlining the calculation. Our results show that, under a mild constraint on the NRQCD operator matrix elements, the NRQCD velocity expansion for the quark-antiquark-operator contributions to the electromagnetic current converges. The velocity expansion converges rapidly for approximate J/ψ operator matrix elements.
AB - We compute in order αs the nonrelativistic QCD (NRQCD) short-distance coefficients that match quark-antiquark operators of all orders in the heavy-quark velocity v to the electromagnetic current. We employ a new method to compute the one-loop NRQCD contribution to the matching condition. The new method uses full-QCD expressions as a starting point to obtain the NRQCD contribution, thus greatly streamlining the calculation. Our results show that, under a mild constraint on the NRQCD operator matrix elements, the NRQCD velocity expansion for the quark-antiquark-operator contributions to the electromagnetic current converges. The velocity expansion converges rapidly for approximate J/ψ operator matrix elements.
UR - http://www.scopus.com/inward/record.url?scp=59249107368&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevD.79.014007
DO - 10.1103/PhysRevD.79.014007
M3 - Article
AN - SCOPUS:59249107368
VL - 79
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 0556-2821
IS - 1
M1 - 014007
ER -