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

被引：28

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.

引用

页数：6

共 43 条

[1]

Amhis Y, 2017, EUR PHYS J C, V77, DOI 10.1140/epjc/s10052-017-5058-4

[2]

[Anonymous], COMMUNICATION

[3]

[Anonymous], ARXIV10031620

[4] Review of lattice results concerning low-energy particle physics [J].

Aoki, S. ;

Aoki, Y. ;

Becirevic, D. ;

Bernard, C. ;

Blum, T. ;

Colangelo, G. ;

Della Morte, M. ;

Dimopoulos, P. ;

Duerr, S. ;

Fukaya, H. ;

Golterman, M. ;

Gottlieb, Steven ;

Hashimoto, S. ;

Heller, U. M. ;

Horsley, R. ;

Juttner, A. ;

Kaneko, T. ;

Lellouch, L. ;

Leutwyler, H. ;

Lin, C. -J. D. ;

Lubicz, V. ;

Lunghi, E. ;

Mawhinney, R. ;

Onogi, T. ;

Pena, C. ;

Sachrajda, C. T. ;

Sharpe, S. R. ;

Simula, S. ;

Sommer, R. ;

Vladikas, A. ;

Wenger, U. ;

Wittig, H. .

EUROPEAN PHYSICAL JOURNAL C, 2017, 77 (02)

[5] RADIATIVE-CORRECTIONS AND SEMILEPTONIC B-DECAYS [J].

ATWOOD, D ;

MARCIANO, WJ .

PHYSICAL REVIEW D, 1990, 41 (05) :1736-1740

[6] B → Dlν form factors at nonzero recoil and |Vcb| from 2+1-flavor lattice QCD [J].

Bailey, Jon A. ;

Bazavov, A. ;

Bernard, C. ;

Bouchard, C. M. ;

DeTar, C. ;

Du, Daping ;

El-Khadra, A. X. ;

Foley, J. ;

Freeland, E. D. ;

Gamiz, E. ;

Gottlieb, Steven ;

Heller, U. M. ;

Komijani, J. ;

Kronfeld, A. S. ;

Laiho, J. ;

Levkova, L. ;

Mackenzie, P. B. ;

Neil, E. T. ;

Qiu, Si-Wei ;

Simone, J. ;

Sugar, R. ;

Toussaint, D. ;

van de Water, R. S. ;

Zhou, Ran .

PHYSICAL REVIEW D, 2015, 92 (03)

[7] PHOTOS - A UNIVERSAL MONTE-CARLO FOR QED RADIATIVE-CORRECTIONS - VERSION 2.0 [J].

BARBERIO, E ;

WAS, Z .

COMPUTER PHYSICS COMMUNICATIONS, 1994, 79 (02) :291-308

[8] PHOTOS - A UNIVERSAL MONTE-CARLO FOR QED RADIATIVE-CORRECTIONS IN DECAYS [J].

BARBERIO, E ;

VANEIJK, B ;

WAS, Z .

COMPUTER PHYSICS COMMUNICATIONS, 1991, 66 (01) :115-128

[9] (B)over-bar → Dτ(ν)over-barτ vs. (B)over-bar → Dμ(ν)over-barμ [J].

Becirevic, Damir ;

Kosnik, Nejc ;

Tayduganov, Andrey .

PHYSICS LETTERS B, 2012, 716 (01) :208-213

[10]

Becirevic D, 2009, ACTA PHYS POL B PR S, V3, P207

← 1 2 3 4 5 →