Duan, M. Y., Lyu, W. T., Xiao, C. W., Wang, E., Xie, J. J., Chen, D. Y., et al. (2025). Λc+ → ηπ+ Λ reaction and the Λa0+(980) and π+Λ(1670) contributions. Phys. Rev. D, 111(1), 016004–10pp.
Abstract: We study from the theoretical point of view the Lambda(+)(c) ->pi(+) eta Lambda reaction, recently measured by the Belle and BESIII Collaborations, where clear signals are observed for a(0)(980), Lambda(1670), and Sigma(1385) excitation. By considering the a(0)(980) and Lambda(1670) as dynamically generated resonances from the meson meson and meson baryon interaction, respectively, we are able to determine their relative production strengths in the reaction, which is also tied to the strength of the pi(+) eta Lambda tree level contribution. We observe that this latter strength is very big and there are large destructive interferences between the tree level and the rescattering terms where the a(0)(980) and Lambda(1670) are generated. The Sigma(1385) contribution is included by means of a free parameter, the only one of the theory, up to a global normalization, when one considers only external emission, and we observe that the spin flip part of this term, usually ignored in theoretical and experimental works, plays an important role determining the shape of the mass distributions. Internal emission is also considered and it is found to a minor role.
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Lyu, W. T., Duan, M. Y., Wang, X. Y., Chen, D. Y., & Wang, E. (2025). Theoretical study of the open-flavored tetraquark Tcs(2900) in the process Bs0→K0D0π0. Eur. Phys. J. C, 85(1), 90–10pp.
Abstract: Recently, the LHCb Collaboration has measured two decay processes B0 -> D0Ds+pi- and B+-> D-Ds+pi+ related to isospin symmetry, where two new open-flavored tetraquark states Tcs(2900)0 and Tcs(2900)++ that belong to an isospin triplet were observed in the Ds+pi- and Ds+pi+ invariant mass distributions. In this work, we have investigated the validity of the process Bs0 -> K0D0 pi 0 as the promising process to confirm the existence of Tcs(2900)0 resonance. Taking into account the tetraquark state Tcs(2900), as well as intermediate resonances K*(892), K0*(1430), and K2*(1430), it has been shown that a clear peak of the open-flavored tetraquark Tcs(2900) appears in the K0D0 invariant mass distribution of the process Bs0 -> K0D0 pi 0, which could be tested by future experiments.
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