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Título:
|
Renormalization group improvement of the nonrelativistic RQCD Lagrangian and heavy quarkonium spectrum
|
Autor/a:
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Pineda, Antonio
|
Otros autores:
|
Universitat de Barcelona |
Abstract:
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We complete the leading-log renormalization group scaling of the nonrelativistic (NRQCD) Lagrangian at
O
(
1
/
m
2
)
.
The next-to-next-to-leading-log renormalization group scaling of the potential NRQCD Lagrangian (as far as the singlet is concerned) is also obtained in the situation
m
α
s
≫
Λ
QCD
.
As a by-product, we obtain the heavy quarkonium spectrum with the same accuracy in the situation
m
α
2
s
≳
Λ
QCD
.
When
Λ
QCD
≪
m
α
2
s
,
this is equivalent to obtain the whole set of
O
(
m
α
(
n
+
4
)
s
ln
n
α
s
)
terms in the heavy quarkonium spectrum. The implications of our results in the nonperturbative situation
m
α
s
∼
Λ
QCD
are also mentioned. |
Materia(s):
|
-Teoria de camps (Física) -Partícules (Física nuclear) -Renormalització (Física) -Pertorbació (Dinàmica quàntica) -Field theory (Physics) -Particles (Nuclear physics) -Renormalization (Physics) -Perturbation (Quantum dynamics) |
Derechos:
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(c) The American Physical Society, 2002
|
Tipo de documento:
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Artículo Artículo - Versión publicada |
Editor:
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The American Physical Society
|
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|
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