Soft-Photon Corrections to Relative to
S de Boer, T Kitahara, I Nišandžić - Physical Review Letters, 2018 - APS
S de Boer, T Kitahara, I Nišandžić
Physical Review Letters, 2018•APSWe evaluate long-distance electromagnetic (QED) contributions to B¯ 0→ D+ τ-ν¯ τ and B-
→ D 0 τ-ν¯ τ relative to B¯ 0→ D+ μ-ν¯ μ and B-→ D 0 μ-ν¯ μ, 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 …
→ D 0 τ-ν¯ τ relative to B¯ 0→ D+ μ-ν¯ μ and B-→ D 0 μ-ν¯ μ, 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 …
We evaluate long-distance electromagnetic (QED) contributions to and relative to and , respectively, in the standard model. We point out that the QED corrections to the ratios and 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 and can be amplified by and , respectively, for the soft-photon energy cut in the range 20–40 MeV.
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