论文标题

向前返回不对称$λ_b\rightarrowλl^+ l^ - $ in bethe-salpeter方程方法

Forward-backward asymmetries in $Λ_b \rightarrow Λl^+ l^-$ in Bethe-Salpeter equation approach

论文作者

Liu, Liang-Liang, Cui, Su-Jun, Xu, Jing, Guo, Xin-Heng

论文摘要

使用Bethe-Salpeter方程(BSE),我们研究了$λ_B\rightArrowλl^+ l^ - (l = e,μ,μ,τ)$中的前向反向不对称$(a_ {fb})$在Quark-Diquark模型中。这种方法提供了与QCD总规则不同的精确形式。我们计算$λ_b\rightArrowλl^+ l^ - $的稀有衰减形式因子,并研究了这些衰变通道中的(集成)向前的不对称。我们发现集成的$ a^l_ {fb} $,$ \ bar {a}^l_ {fb}(λ_b\rightarrowλe^+ e^ - )\ simeq -0.1371 $,$ \ bar {a} -0.1376 $,$ \ bar {a}^l_ {fb}(λ_b\rightArrowλτ^+τ^ - )\ simeq -0.1053 $,强子侧ASMMETRIES $ \ bar {a} a} a} a}^h_} -0.2315 $,Lepton-HADRON侧面不对称$ \ bar {a}^{lh} _ {fb}(λ_b\rightArrowλμ^+μ^+μ^ - )\ simeq 0.0827 $ μ^ - )\ simeq 0.5681 $。

Using the Bethe-Salpeter equation (BSE) we investigate the forward-backward asymmetries $( A_{FB}) $ in $Λ_b \rightarrow Λl^+ l^-(l=e,μ,τ)$ in the quark-diquark model. This approach provides precise form factors that are different from those of QCD sum rules. We calculate the rare decay form factors for $Λ_b \rightarrow Λl^+ l^-$ and investigate the (integrated) forward-backward asymmetries in these decay channels. We find that the integrated $A^l_{FB}$, $\bar{A}^l_{FB}(Λ_b \rightarrow Λe^+ e^-) \simeq -0.1371 $, $\bar{A}^l_{FB}(Λ_b \rightarrow Λμ^+ μ^- ) \simeq -0.1376 $, $\bar{A}^l_{FB}(Λ_b \rightarrow Λτ^+ τ^-) \simeq -0.1053 $, the hadron side asymmetries $\bar{A}^h_{FB}(Λ_b \rightarrow Λμ^+ μ^-)\simeq -0.2315$, the lepton-hadron side asymmetries $\bar{A}^{lh}_{FB}(Λ_b \rightarrow Λμ^+ μ^-)\simeq 0.0827$, the longitudinal polarization fractions $\bar{F}_L(Λ_b \rightarrow Λμ^+ μ^-)\simeq 0.5681$.

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