Soft-Photon Corrections to (B)over-bar → Dτ-(v)over-barτ Relative to (B)over-bar → Dμ-(v)over-barμ

被引：26
作者：
de Boer, Stefan [1 ]
Kitahara, Teppei [1 ,2 ]
Nisandzic, Ivan [1 ]
机构：
[1] Karlsruhe Inst Technol, Inst Theoret Particle Phys TTP, Engesserstr 7, D-76128 Karlsruhe, Germany
[2] Karlsruhe Inst Technol, Inst Nucl Phys IKP, Hermann von Helmholtz Pl 1, D-76344 Eggenstein Leopoldshafen, Germany
来源：
PHYSICAL REVIEW LETTERS | 2018年 / 120卷 / 26期
关键词：
QED RADIATIVE-CORRECTIONS; UNIVERSAL MONTE-CARLO; O(ALPHA);
D O I：
10.1103/PhysRevLett.120.261804
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We evaluate long-distance electromagnetic (QED) contributions to (B) over bar (0) -> D+ tau-(v) over bar (tau) and B- -> D-0 tau(-)(v)over bar>(tau) relative to (B) over bar (0) -> D+ mu(-)(v) over bar (mu) and B- -> D-0 mu(-)(v) over bar (mu), respectively, in the standard model. We point out that the QED corrections to the ratios R(D+) and R(D-0) are not negligible, contrary to the expectation that radiative corrections are almost canceled out in the ratio of the two branching fractions. The reason is that long-distance QED corrections depend on the masses and relative velocities of the daughter particles. We find that theoretical predictions for R(D+)(tau/mu) and R(D-0)(tau/mu) can be amplified by similar to 4% and similar to 3%, respectively, for the soft-photon energy cut in the range 20-40 MeV.
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页数：6
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