Enhanced electromagnetic correction to the rare $B$-meson decay $B_{s,d} \to \mu^+ \mu^-$ - INSPIRE

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Enhanced electromagnetic correction to the rare $B$ -meson decay $B_{s,d} \to \mu^+ \mu^-$

Martin Beneke
(
- Munich, Tech. U.
)
,
Christoph Bobeth
(
- Munich, Tech. U. and
- Munich, Tech. U., Universe
)
,
Robert Szafron
(
- Munich, Tech. U.
)

Aug 30, 2017

5 pages

Published in:

Phys.Rev.Lett. 120 (2018) 1, 011801

Published: Jan 6, 2018

e-Print:

1708.09152 [hep-ph]

DOI:

10.1103/PhysRevLett.120.011801

Report number:

TUM-HEP-1094-17

View in:

ADS Abstract Service

reference search121 citations

Citations per year

Abstract: (APS)

We investigate electromagnetic corrections to the rare B-meson leptonic decay Bs,d→μ+μ- from scales below the bottom-quark mass mb. Contrary to QCD effects, which are entirely contained in the B-meson decay constant, we find that virtual photon exchange can probe the B-meson structure, resulting in a “nonlocal annihilation” effect. We find that this effect gives rise to a dynamical enhancement by a power of mb/ΛQCD and by large logarithms. The impact of this novel effect on the branching ratio of Bs,d→μ+μ- is about 1%, of the order of the previously estimated nonparametric theoretical uncertainty, and four times the size of previous estimates of next-to-leading order QED effects due to residual scale dependence. We update the standard model (SM) prediction to B¯(Bs→μ+μ-)SM=(3.57±0.17)×10-9.

correction: electromagnetic
quantum electrodynamics: effect
photon: exchange
photon: virtual
higher-order: 1
scale dependence
B: branching ratio
B: rare decay
B: leptonic decay
B: decay constant

References(26)

Figures(3)

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