English

Color-allowed Bottom Baryon to $s$-wave and $p$-wave Charmed Baryon non-leptonic Decays

High Energy Physics - Phenomenology 2019-09-04 v2

Abstract

We study color allowed bottom baryon to ss-wave and pp-wave charmed baryon non-leptonic decays in this work. The charmed baryons include spin-1/2 and spin-3/2 states. Explicitly, we consider ΛbΛc(,)M\Lambda_b\to \Lambda^{(*,**)}_c M^-, ΞbΞc()M\Xi_b\to\Xi_c^{(**)} M^- and ΩbΩc(,)M\Omega_b\to\Omega^{(*,**)}_c M^- decays with M=π,K,ρ,K,a1,D,Ds,D,DsM=\pi, K, \rho, K^*, a_1, D, D_s, D^*, D^*_s, Λc(,)=Λc,Λc(2595),Λc(2625),Λc(2765),Λc(2940)\Lambda^{(*,**)}_c=\Lambda_c, \Lambda_c(2595), \Lambda_c(2625), \Lambda_c(2765), \Lambda_c(2940), Ξc()=Ξc,Ξc(2815),Ξc(2790)\Xi_c^{(**)}=\Xi_c, \Xi_c(2815), \Xi_c(2790) and Ωc(,)=Ωc,Ωc(2770),Ωc(3050),Ωc(3090),Ωc(3120)\Omega^{(*,**)}_c=\Omega_c, \Omega_c(2770), \Omega_c(3050), \Omega_c(3090), \Omega_c(3120). There are six types of transitions, namely, (i) Bb(3ˉf,1/2+){\cal B}_b({\bf \bar 3_f},1/2^+) to Bc(3ˉf,1/2+){\cal B}_c({\bf \bar 3_f},1/2^+), (ii) Bb(6f,1/2+){\cal B}_b({\bf 6_f},1/2^+) to Bc(6f,1/2+){\cal B}_c({\bf 6_f},1/2^+), (iii) Bb(6f,1/2+){\cal B}_b({\bf 6_f},1/2^+) to Bc(6f,3/2+){\cal B}_c({\bf 6_f},3/2^+), (iv) Bb(6f,1/2+){\cal B}_b({\bf 6_f},1/2^+) to Bc(6f,3/2){\cal B}_c({\bf 6_f},3/2^-), (v) Bb(3ˉf,1/2+){\cal B}_b({\bf \bar 3_f},1/2^+) to Bc(3ˉf,1/2){\cal B}_c({\bf \bar 3_f},1/2^-), and (vi) Bb(3ˉf,1/2+){\cal B}_b( {\bf \bar 3_f},1/2^+) to Bc(3ˉf,3/2){\cal B}_c({\bf \bar 3_f},3/2^-) transitions. Types (i) to (iii) involve spin 1/2 and 3/2 ss-wave charmed baryons, while types (iv) to (vi) involve spin 1/2 and 3/2 pp-wave charmed baryons. The transition form factors are calculated in the light-front quark model approach. All of the form factors in the 1/21/21/2\to 1/2 and 1/23/21/2 \to 3/2 transitions are extracted, and they are found to reasonably satisfy the relations obtained in the heavy quark limit, as we are using heavy but finite mbm_b and mcm_c. Using na\"{i}ve factorization, decay rates and up-down asymmetries of the above modes are predicted and can be checked experimentally. The study on these decay modes may shed light on the quantum numbers of Λc(2765)\Lambda_c(2765), Λc(2940)\Lambda_c(2940) Ωc(3050)\Omega_c(3050), Ωc(3090)\Omega_c(3090) and Ωc(3120)\Omega_c(3120).

Keywords

Cite

@article{arxiv.1905.00153,
  title  = {Color-allowed Bottom Baryon to $s$-wave and $p$-wave Charmed Baryon non-leptonic Decays},
  author = {Chun-Khiang Chua},
  journal= {arXiv preprint arXiv:1905.00153},
  year   = {2019}
}

Comments

To appear in Phys. Rev. D, 45 pages, 15 tables, 6 figures