Abstract
AbstractInspired by the recent hints of lepton flavor universality violation in $$b\rightarrow s\ell \ell $$b→sℓℓ and $$b\rightarrow c\ell \nu $$b→cℓν transitions, we study lepton flavor violating exclusive $$\Lambda _b\rightarrow \Lambda \ell _1^+\ell _2^-$$Λb→Λℓ1+ℓ2- ($$\ell _1\ne \ell _2$$ℓ1≠ℓ2) decay, which is forbidden in the Standard Model. Starting from a general effective Hamiltonian for a $$b\rightarrow s\ell _1^+\ell _2^-$$b→sℓ1+ℓ2- transition that includes vector and axial-vector operators, and scalar and pseudo-scalar operators, we derive a two-fold decay distribution of $$\Lambda _b\rightarrow \Lambda \ell _1^+\ell _2^-$$Λb→Λℓ1+ℓ2-. The distribution helps us to construct the differential branching ratio and the lepton-side forward–backward asymmetry, which are studied in a vector leptoquark model. The parameter space of the vector leptoquark model is constrained by low energy observables.
Publisher
Springer Science and Business Media LLC
Subject
Physics and Astronomy (miscellaneous),Engineering (miscellaneous)
Reference47 articles.
1. R. Aaij et al. [LHCb Collaboration], Search for lepton-universality violation in $$B^+\rightarrow K^+\ell ^+\ell ^-$$ decays. Phys. Rev. Lett. 122(19), 191801 (2019). arXiv:1903.09252 [hep-ex]
2. M. Bordone, G. Isidori, A. Pattori, On the standard model predictions for $$R_K$$ and $$R_{K^*}$$. Eur. Phys. J. C 76(8), 440 (2016). arXiv:1605.07633 [hep-ph]
3. R. Aaij et al., [LHCb Collaboration], Test of lepton universality with $$B^{0} \rightarrow K^{*0}\ell ^{+}\ell ^{-}$$ decays. JHEP 1708, 055 (2017). arXiv:1705.05802 [hep-ex]
4. A. Abdesselam et al. [Belle Collaboration], Test of lepton flavor universality in $${B\rightarrow K^\ast \ell ^+\ell ^-}$$ decays at Belle. arXiv:1904.02440 [hep-ex]
5. S. Hirose et al. [Belle Collaboration], Measurement of the $$\tau $$ lepton polarization and $$R(D^*)$$ in the decay $$\bar{B} \rightarrow D^* \tau ^- \bar{\nu }_\tau $$. Phys. Rev. Lett. 118(21), 211801 (2017). arXiv:1612.00529 [hep-ex]
Cited by
10 articles.
订阅此论文施引文献
订阅此论文施引文献，注册后可以免费订阅5篇论文的施引文献，订阅后可以查看论文全部施引文献