2023/05/24 by Niu, Juan-Juan, Li, Jing-Bo, Bi, Huan-Yu +1
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph)
paper · doi:10.48550/arxiv.2305.15362
In the framework of nonrelativistic QCD, the excited doubly heavy baryons are thoroughly studied via the channel e+ e-→ ⟨ QQ′⟩[n] → ΞQQ′ +Q′ +Q, which takes place at the collision energy Z-pole. Q(′) represents b or c quark for the production of Ξcc, Ξbc, and Ξbb, respectively. All of the intermediate diquark states ⟨ QQ'⟩[n] in P-wave, ⟨ cc⟩[1P1] 3, ⟨ cc⟩[3PJ]6, ⟨ bc⟩[1P1] 3/ 6, ⟨ bc⟩[3PJ] 3/ 6, ⟨ bb ⟩[1P1] 3, and ⟨ bb⟩[3PJ]6 with J=0, 1, or 2, are taken into account. The cross sections and differential distributions, including the transverse momentum, rapidity, angular, and invariant mass, are discussed for the excited baryons production. We find that the contributions of ⟨ cc ⟩, ⟨ bc ⟩, and ⟨ bb ⟩ in P-wave are found to be 3.97%, 5.08%, and 5.89%, respectively, compared to S-wave. Supposing that all excited states can decay into the ground state 100%, the total events N_Ξcc=8.48 ×104-6, N_Ξbc=2.26×105-7, and N_Ξbb=4.12 ×103-5 would be produced at the Super-Z Factory with a high luminosity up to \cal L ≃ 1034-36\rm cm-2 \rm s-1.