论文标题
两体baryonic $ b_ {u，d，s} $和$ b_c $
Two-body Baryonic $B_{u,d,s}$ and $B_c$ to Charmless Final State Decays
论文作者
论文摘要
我们研究了对两体baryonic $ \ bar b_ {u，d，s} \ to {{{\ rm \ bf b} \ overline {\ rm \ rm \ bf b}}'$和$ b^-_c c \ to {腐烂，最终的州重子包括低洼八位位和解剖重子。我们结合了拓扑幅度形式主义和分解方法。 $ m_b $的渐近关系用于简化衰减幅度。使用$ \ bar b^0 \上的最新数据到p \ bar p $和$ b^ - \toλ\ bar p $衰减率作为输入，速率和直接cp违反$ \ bar b_ {u，d，d，d，s} \ \ to {\ rm \ bf bf bf b} \ precise {有趣的是，速率的结果满足了所有现有的实验界限，有些则接近界限。分解图有助于企鹅交换，交换，an灭和企鹅宣传幅度。尽管由此产生的企鹅交换幅度幅度相当可观，但其余的则遭受了严重的手性抑制作用，并且对不可分割的贡献敏感。 $ \ bar b_s \ to p \ bar p $衰减率在分解计算中预测的速率非常罕见，但是可以通过包括不可分割的贡献来增强它。讨论了提高速率以使本实验结合饱和的情况。由于歼灭模式$ b^-_ c \ to {{\ rm \ bf b} \叠加{\ rm \ bf b}}'$从分解计算中衰减的衰减非常罕见，但可以通过包括不可分配的贡献来增强它们。 $ΔS= -1 $ $ \ bar b_ {u，d，d，s} \ to {{{\ rm \ bf b} \ edmepline {\ rm \ bf b}}'$衰减是违反直接交换的cp cp cp able Exphere cp， b_ {u，d，s} \ to {{\ rm \ bf b} \ intline {\ rm \ bf b}}'$衰变，并且在所有$ b^-_ c \ to {\ rm \ rm \ bf b} \ to {\ rm \ bf b} \ intline {\ rm \ rm \ rm \ bf b b}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}}'
We study the rates and direct CP violations of two-body baryonic $\bar B_{u,d,s}\to {{\rm\bf B}\overline{\rm\bf B}}'$ and $B^-_c\to{{\rm\bf B}\overline{\rm\bf B}}'$ decays, where the final state baryons include low-lying octet and decuplet baryons. We incorporate topological amplitude formalism and the factorization approach. Asymptotic relations at large $m_b$ are used to simplify decay amplitudes. Using the most up-to-date data on $\bar B^0\to p\bar p$ and $B^-\toΛ\bar p$ decay rates as inputs, rates and direct CP violations of $\bar B_{u,d,s}\to {{\rm\bf B}\overline{\rm\bf B}}'$ decays are revised and predicted. It is interesting that the results on rates satisfy all existing experimental bounds and some are close to the bounds. Factorization diagrams contribute to penguin-exchange, exchange, annihilation and penguin-annihilation amplitudes. Although the resulting penguin-exchange factorization amplitudes are sizable, the rest suffer from severe chiral suppression and are sensitive to non-factorizable contributions. The $\bar B_s\to p\bar p$ decay rate predicted in factorization calculation is very rare, but it can be enhanced by including non-factorizable contributions. The case where the rate is enhanced to saturate the present experimental bound is discussed. As annihilation modes $B^-_c\to{{\rm\bf B}\overline{\rm\bf B}}'$ decays from factorization calculation are found to be very rare, but they can be enhanced by including non-factorizable contributions as well. Small direct CP violations of pure penguin modes in $ΔS=-1$ $\bar B_{u,d,s}\to{{\rm\bf B}\overline{\rm\bf B}}'$ decays are robust predictions of the SM, while vanishing direct CP violations of exchange modes in $\bar B_{u,d,s}\to{{\rm\bf B}\overline{\rm\bf B}}'$ decays and in all $B^-_c\to{{\rm\bf B}\overline{\rm\bf B}}'$ decay modes are null tests of the SM.
