T_{bc s} states in the process Υ→ D^- B⁰ D_s⁺

2025/08/26 by Liu, Wen-Ying, Chen, Hua-Xing
#FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph)

paper · doi:10.48550/arxiv.2508.19007

Abstract

We perform a theoretical study of the decay process Υ→ D^- B⁰ D_s⁺ in search of the doubly heavy tetraquark states T_bcs with quark content bcsd. These T_bcs states are assumed to be dynamically generated molecular states from the S-wave interactions between B_s^(*)0 D^(*)+ and B^(*)0 D_s^(*)+ meson pairs. Based on the total angular momentum and the type of the constituent mesons (pseudoscalars P or vectors V), they are labeled as T_bcs^{0, PP}, T_bcs^{0, VV}, and T_bcs^{2, VV}, respectively. The B⁰ D_s⁺ invariant mass distribution for this decay is calculated using current algebra, incorporating contributions from T_bcs states arising from final-state interactions. Our results reveal a clear peak structure in the 7415 - 7425 MeV region, which is attributed to the T_bcs^{2, VV} state. Additionally, a distinct dip structure appears near the B^*0 D_s^*+ threshold, characteristic of the T_bcs^{2, VV} as a hadronic molecular state. A near-threshold enhancement associated with the T_bcs^{0, PP} state and a dip arising from the T_bcs^{0, VV} state are also identified, though the manifestation of these features depends sensitively on model parameter fine-tuning. Therefore, with increased experimental statistics, the decay channel Υ→ D^- B⁰ D_s⁺ offers a promising avenue for discovering and characterizing the T_bcs states.

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