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
复制标题

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
复制
发表时间:
2018
期刊:
影响因子:
4.4
通讯作者:
F. Staub
F. Staub
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
T. Faber;M. Hudec;M. Malinský;P. Meinzinger;W. Porod;F. Staub

文献摘要

参考文献

被引文献

相似文献

B介子扇区的反常现象,特别是R K(K)和R D(K),经常被解释为标准模型之外的物理学的暗示。为此,细夸克或重Z′代表了最流行的SM扩展,可以解释观测结果。然而,手工添加这些场并不令人满意,因为它没有解决大问题,如可能嵌入统一规范理论。另一方面,在一个统一的框架内的轻leptoquark是具有挑战性的,由于额外的限制,如轻子味破坏。现有账户通常通过提供有关耦合的估计数来处理这一问题。本文考虑了一个基于SU(4)C <$SU(2)L <$U(1)R规范对称性的完备模型,它是SO(10)的一个子群,具有标量和矢量轻夸克。我们证明,这种设置,在原则上,所有的潜力,以适应R K()和R D(),同时尊重其他部门通常在这种情况下检查的界限。然而,事实证明KL → e±μ π不仅严格限制了矢量,而且严格限制了标量轻夸克,因此也限制了R K(ε)相对于1的任何相当大的偏差。我们简要地评论的选项扩展模型,以符合这一约束。此外,我们提出了一个简单的标准,在这类模型的所有订单质子稳定性。
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.
矢量轻夸克质量极限和 KL0,B0,Bs → li+lj− 的分支比随着轻夸克电流中费米子混合的衰减而衰减
DOI: 10.1142/s0217732318500190
发表时间: 2018
影响因子: 1.4
作者:
A. D. Smirnov
通讯作者: A. D. Smirnov
另一种 SU(4)⊗SU(2) L ⊗SU(2) R 模型
DOI: 10.1016/s0370-2693(97)01519-0
发表时间: 1997
期刊: Physics Letters B
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
DOI: 10.1103/physrevd.98.030001
发表时间: 2018-08
期刊: Physical Review D
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