Exclusive radiative decays of Upsilon in SCET - INSPIRE

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Exclusive radiative decays of Upsilon in SCET

Nov, 2004

16 pages

Published in:

Phys.Rev.D 71 (2005) 074002

e-Print:

hep-ph/0411180 [hep-ph]

DOI:

10.1103/PhysRevD.71.074002

Report number:

CALT-68-2530

View in:

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Abstract:

We study exclusive radiative decays of the

\Upsilon

using soft-collinear effective theory and non-relativistic QCD. In contrast to inclusive radiative decays at the endpoint we find that color-octet contributions are power suppressed in exclusive decays, and can safely be neglected, greatly simplifying the analysis. We determine the complete set of Lorentz structures that can appear in the SCET Wilson coefficients and match onto them using results from a previous calculation. We run these coefficients from the scale \mups to the scale

\Lambda \sim 1 \textrm{GeV}

, thereby summing large logarithms. Finally we use our results to predict the ratio of branching fractions

B(\Upsilon \to \gamma f_2)/B(J/\psi \to \gamma f_2)

,

B(J/\psi \to \gamma f_2)/B(\psi' \to \gamma f_2)

, and the partial rate for

\Upsilon \to \gamma \pi \pi

.

13.25.Gv
upsilon mesons: radiative decay
decay: exclusive reaction
upsilon mesons: branching ratio
upsilon mesons: width
quantum chromodynamics: nonrelativistic
soft collinear effective theory
color: octet
color: singlet
symmetry: Lorentz

References(36)

Figures(0)

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