Revisiting Lepton Flavor Universality in B Decays

被引:141
作者
Feruglio, Ferruccio [1 ,2 ]
Paradisi, Paride [1 ,2 ]
Pattori, Andrea [1 ,3 ]
机构
[1] Univ Padua, Dipartimento Fis & Astron G Galilei, I-35100 Padua, Italy
[2] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
[3] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland
基金
欧盟地平线“2020”; 瑞士国家科学基金会;
关键词
R-K; VIOLATION;
D O I
10.1103/PhysRevLett.118.011801
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Lepton flavor universality (LFU) in B decays is revisited by considering a class of semileptonic operators defined at a scale. above the electroweak scale v. The importance of quantum effects, so far neglected in the literature, is emphasized. We construct the low-energy effective Lagrangian taking into account the running effects from. down to v through the one-loop renormalization group equations (RGEs) in the limit of exact electroweak symmetry and QED RGEs from v down to the 1 GeV scale. The most important quantum effects turn out to be the modification of the leptonic couplings of the vector boson Z and the generation of a purely leptonic effective Lagrangian. Large LFU breaking effects in Z and tau decays and visible lepton flavor violating effects in the processes tau -> mu ll, tau ->mu rho , tau -> mu pi, and tau -> mu eta((')) are induced.
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页数:5
相关论文
共 36 条
[1]   Test of Lepton Universality Using B+ → K+l+l- Decays [J].
Aaij, R. ;
Adeva, B. ;
Adinolfi, M. ;
Affolder, A. ;
Ajaltouni, Z. ;
Akar, S. ;
Albrecht, J. ;
Alessio, F. ;
Alexander, M. ;
Ali, S. ;
Alkhazov, G. ;
Cartelle, P. Alvarez ;
Alves, A. A., Jr. ;
Amato, S. ;
Amerio, S. ;
Amhis, Y. ;
An, L. ;
Anderlini, L. ;
Anderson, J. ;
Andreassen, R. ;
Andreotti, M. ;
Andrews, J. E. ;
Appleby, R. B. ;
Gutierrez, O. Aquines ;
Archilli, F. ;
Artamonov, A. ;
Artuso, M. ;
Aslanides, E. ;
Auriemma, G. ;
Baalouch, M. ;
Bachmann, S. ;
Back, J. J. ;
Badalov, A. ;
Balagura, V. ;
Baldini, W. ;
Barlow, R. J. ;
Barschel, C. ;
Barsuk, S. ;
Barter, W. ;
Batozskaya, V. ;
Battista, V. ;
Bay, A. ;
Beaucourt, L. ;
Beddow, J. ;
Bedeschi, F. ;
Bediaga, I. ;
Belogurov, S. ;
Belous, K. ;
Belyaev, I. ;
Ben-Haim, E. .
PHYSICAL REVIEW LETTERS, 2014, 113 (15)
[2]   Measurement of the Ratio of Branching Fractions B((B)over-bar0 → D*+τ-(ν)over-barτ)/B((B)over-bar0 → D*+μ-(ν)over-barμ) [J].
Aaij, R. ;
Adeva, B. ;
Adinolfi, M. ;
Affolder, A. ;
Ajaltouni, Z. ;
Akar, S. ;
Albrecht, J. ;
Alessio, F. ;
Alexander, M. ;
Ali, S. ;
Alkhazov, G. ;
Cartelle, P. Alvarez ;
Alves, A. A., Jr. ;
Amato, S. ;
Amerio, S. ;
Amhis, Y. ;
An, L. ;
Anderlini, L. ;
Anderson, J. ;
Andreassi, G. ;
Andreotti, M. ;
Andrews, J. E. ;
Appleby, R. B. ;
Gutierrez, O. Aquines ;
Archilli, F. ;
d'Argent, P. ;
Artamonov, A. ;
Artuso, M. ;
Aslanides, E. ;
Auriemma, G. ;
Baalouch, M. ;
Bachmann, S. ;
Back, J. J. ;
Badalov, A. ;
Baesso, C. ;
Baldini, W. ;
Barlow, R. J. ;
Barschel, C. ;
Barsuk, S. ;
Barter, W. ;
Batozskaya, V. ;
Battista, V. ;
Bay, A. ;
Beaucourt, L. ;
Beddow, J. ;
Bedeschi, F. ;
Bediaga, I. ;
Bel, L. J. ;
Bellee, V. ;
Belyaev, I. .
PHYSICAL REVIEW LETTERS, 2015, 115 (11)
[3]   Lepton universality violation with lepton flavor conservation in B-meson decays [J].
Alonso, R. ;
Grinstein, B. ;
Camalich, J. Martin .
JOURNAL OF HIGH ENERGY PHYSICS, 2015, (10)
[4]   SU(2) x U(1) Gauge Invariance and the Shape of New Physics in Rare B Decays [J].
Alonso, R. ;
Grinstein, B. ;
Camalich, J. Martin .
PHYSICAL REVIEW LETTERS, 2014, 113 (24)
[5]  
Altmannshofer W, 2015, EUR PHYS J C, V75, DOI 10.1140/epjc/s10052-015-3602-7
[6]   Quark flavor transitions in Lμ - Lτ models [J].
Altmannshofer, Wolfgang ;
Gori, Stefania ;
Pospelov, Maxim ;
Yavin, Itay .
PHYSICAL REVIEW D, 2014, 89 (09)
[7]  
[Anonymous], ARXIV14127515
[8]   Anomalies in B-decays and U(2) flavor symmetry [J].
Barbieri, Riccardo ;
Isidori, Gino ;
Pattori, Andrea ;
Senia, Fabrizio .
EUROPEAN PHYSICAL JOURNAL C, 2016, 76 (02) :1-10
[9]   Minimal Leptoquark Explanation for the RD(*), RK, and (g-2)μ Anomalies [J].
Bauer, Martin ;
Neubert, Matthias .
PHYSICAL REVIEW LETTERS, 2016, 116 (14)
[10]   Lepton flavor nonuniversality in b → sl+l- processes [J].
Becirevic, Damir ;
Fajfer, Svjetlana ;
Kosnik, Nejc .
PHYSICAL REVIEW D, 2015, 92 (01)