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首页> 外文期刊>Physical review, D >Color-allowed bottom baryon to charmed baryon nonleptonic decays
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Color-allowed bottom baryon to charmed baryon nonleptonic decays

机译:颜色允许的底部重子到迷人的重子非轻子衰变

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We study color allowed Λ b → Λ c ( * , * * ) M ? , Ξ b → Ξ c ( * * ) M ? , and Ω b → Ω c ( * ) M ? decays with M = π , K , ρ , K * , D , D s , D * , D s * , a 1 , Λ c ( * , * * ) = Λ c , Λ c ( 2595 ) , Λ c ( 2765 ) , Λ c ( 2940 ) , Ξ c ( * * ) = Ξ c , Ξ c ( 2790 ) , and Ω c ( * ) = Ω c , Ω c ( 3090 ) , in this work. There are three types of transitions, namely B b ( 3 ˉ f , 1 / 2 + ) to B c ( 3 ˉ f , 1 / 2 + ) , B b ( 6 f , 1 / 2 + ) to B c ( 6 f , 1 / 2 + ) , and B b ( 3 ˉ f , 1 / 2 + ) to B c ( 3 ˉ f , 1 / 2 ? ) transitions. The bottom baryon to charmed baryon form factors are calculated using the light-front quark model. Decay rates and up-down asymmetries are predicted using na?ve factorization and can be checked experimentally. We find that in B b → B c P decays, rates in B b ( 6 f , 1 / 2 + ) → B c ( 6 f , 1 / 2 + ) [type (ii)] transition are smaller than those in B b ( 3 ˉ f , 1 / 2 + ) → B c ( 3 ˉ f , 1 / 2 + ) [type (i)] transition, but similar to those in B b ( 3 ˉ f , 1 / 2 + ) → B c ( 3 ˉ f , 1 / 2 ? ) [type (iii)] transition, while in B b → B c V , B c A decays, rates in B b ( 6 f , 1 / 2 + ) → B c ( 6 f , 1 / 2 + ) [type (ii)] transition are much smaller than those in B b ( 3 ˉ f , 1 / 2 + ) → B c ( 3 ˉ f , 1 / 2 + ) [type (i)] transition and are also smaller than those in B b ( 3 ˉ f , 1 / 2 + ) → B c ( 3 ˉ f , 1 / 2 ? ) [type (iii)] transition. For the up-down asymmetries, the signs are mostly negative, except for those in the B b ( 6 f , 1 / 2 + ) → B c ( 6 f , 1 / 2 + ) [type (ii)] transition. Most of these asymmetries are large in sizes. The study on these decay modes may shed light on the quantum numbers of some of the charmed baryons as the decays depend on the bottom baryon to charmed baryon form factors, which are sensitive to the configurations of the final state charmed baryons.
机译:我们研究允许的颜色Λb→Λc(*,* *)M? ,Ξb→Ξc(* *)M? ,Ωb→Ωc(*)M? M =π,K,ρ,K *,D,D s,D *,D s *,a 1,Λc(*,* *)=Λc,Λc(2595),Λc(2765) ),Λc(2940),Ξc(* *)=Ξc,Ξc(2790)和Ωc(*)=Ωc,Ωc(3090)。共有三种过渡类型,即B b(3ˉf,1/2 +)到B c(3ˉf,1/2 +),B b(6 f,1/2 +)到B c(6 f,1/2 +)和B b(3ˉf,1/2 +)到B c(3ˉf,1/2?)过渡。底部重子到有魅力的重子形状因子是使用光前夸克模型计算的。衰变率和上下不对称性可通过简单的因子分解进行预测,并可以通过实验进行检查。我们发现在B b→B c P衰减中,B b(6 f,1/2 +)→B c(6 f,1/2 +)[类型(ii)]的变化率小于B b(3ˉf,1/2 +)→B c(3ˉf,1/2 +)[类型(i)]转换,但与B b(3ˉf,1/2 +)中的转换相似B c(3ˉf,1/2?)[(iii)型]转变,而在B b→B c V中,B c A衰减,B b(6 f,1/2 +)→B c的速率(6 f,1/2 +)[type(ii)]的跃迁要比B b(3ˉf,1/2 +)→B c(3ˉf,1/2 +)[type(ii i)]跃迁,并且也小于B b(3ˉf,1/2 +)→B c(3ˉf,1/2 +)[type(iii)]跃迁中的跃迁。对于上下不对称性,除B b(6 f,1/2 +)→B c(6 f,1/2 +)[类型(ii)]过渡中的符号外,其他符号大多为负号。这些不对称中的大多数不大。对这些衰变模式的研究可能会揭示一些有魅力的重子的量子数,因为衰变取决于底部重子到有魅力的重子形状因子,这些因子对最终状态有魅力的重子的构型敏感。

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