A unified leptoquark model confronted with lepton non-universality in B-meson decays
A unified leptoquark model confronted with lepton non-universality in B-meson decays
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B介子衰变中面临轻子非普遍性的统一轻夸克模型
DOI:
10.1016/j.physletb.2018.10.051
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发表时间:
2018
影响因子:
4.4
通讯作者:
F. Staub
中科院分区:
文献类型:
--
作者:
T. Faber;M. Hudec;M. Malinský;P. Meinzinger;W. Porod;F. Staub
The anomalies in the B-meson sector, in particular R K (⁎) and R D (⁎), are often interpreted as hints for physics beyond the Standard Model. To this end, leptoquarks or a heavy Z′ represent the most popular SM extensions which can explain the observations. However, adding these fields by hand is not very satisfactory as it does not address the big questions like a possible embedding into a unified gauge theory. On the other hand, light leptoquarks within a unified framework are challenging due to additional constraints such as lepton flavor violation. The existing accounts typically deal with this issue by providing estimates on the relevant couplings. In this letter we consider a complete model based on the S U (4) C⊗ S U (2) L⊗ U (1) R gauge symmetry, a subgroup of S O (10), featuring both scalar and vector leptoquarks. We demonstrate that this setup has, in principle, all the potential to accommodate R K (⁎) and R D (⁎) while respecting bounds from other sectors usually checked in this context. However, it turns out that K L→ e±μ∓ severely constraints not only the vector but also the scalar leptoquarks and, consequently, also the room for any sizeable deviations of R K (⁎) from 1. We briefly comment on the options for extending the model in order to conform this constraint. Moreover, we present a simple criterion for all-orders proton stability within this class of models.
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影响因子:
1.4
作者:
A. D. Smirnov
通讯作者:
A. D. Smirnov
影响因子:
4.4
作者:
R. Foot
通讯作者:
R. Foot
DOI:
10.1140/epjc/s10052-014-3247-y
发表时间:
2014-11
期刊:
The European Physical Journal C
影响因子:
--
作者:
M. Goodsell;K. Nickel;F. Staub
通讯作者:
M. Goodsell;K. Nickel;F. Staub
DOI:
10.1140/epjc/s10052-014-2992-2
发表时间:
2014-05
期刊:
The European Physical Journal C
影响因子:
--
作者:
W. Porod;F. Staub;A. Vicente
通讯作者:
W. Porod;F. Staub;A. Vicente
影响因子:
5
作者:
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli
通讯作者:
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli