Study on the charmless decay modes of Zcs(3985)
Abstract
In this work, we investigate the charmless decay modes of the hidden-charm tetraquark state with strangeness, Zcs(3985), assuming it to be an S-wave hadronic molecule of Ds*−D0 and Ds−D*0 with quantum numbers I(JP) = 1/2(1+). Using an effective Lagrangian approach, we calculate the decay amplitudes for Zcs → 𝒫𝒱 (where 𝒫 and 𝒱 denote light pseudoscalar and vector mesons, respectively) via triangle loop diagrams. We use the experimental upper limit on Zc(3900)→ πω to constrain the cutoff parameter for both the dipole and tripole form factors. Numerical results from the dipole form factor show that the branching ratios for Zcs → πK* can reach up to the order of 10−2, which is of the same order of magnitude as the hidden charm decay modes and may be detected in future measurements. The branching ratios from tripole form factor are not consistent with those from the dipole form factor, indicating a certain degree of model dependence in the present work. The relative ratios of the branching ratios for different decay channels are found to be almost independent of the cutoff parameter. However, some ratios are highly dependent on the choice of the dipole or tripole form factor. The branching ratio of Zcs → ηK* is found to be highly sensitive to the η-η′ mixing angle, while that for Zcs → η′ K* is almost independent of the mixing angle, making it a clean channel for future experimental measurements.
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BibTeX
@misc{zhou2026study,
title = {{Study on the charmless decay modes of $Z_cs(3985)$}},
author = {Yi-Zhuo Zhou and Shi-Dong Liu and Qi Wu and Qing-Ping Ji and Dian-Yong Chen and Gang Li},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.03480},
eprint = {2611.03480},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.03480},
note = {CC0},
}
RIS
TY - UNPB
TI - Study on the charmless decay modes of Z_cs(3985)
AU - Yi-Zhuo Zhou
AU - Shi-Dong Liu
AU - Qi Wu
AU - Qing-Ping Ji
AU - Dian-Yong Chen
AU - Gang Li
PY - 2026
DA - 2026/11/02
PB - arXiv
DO - 10.48550/arxiv.2611.03480
UR - https://arxiv.org/abs/2611.03480
AB - In this work, we investigate the charmless decay modes of the hidden-charm tetraquark state with strangeness, Z_cs(3985), assuming it to be an S-wave hadronic molecule of D_s^*−D^0 and D_s^−D^*0 with quantum numbers I(J^P) = 1/2(1^+). Using an effective Lagrangian approach, we calculate the decay amplitudes for Z_cs → 𝒫𝒱 (where 𝒫 and 𝒱 denote light pseudoscalar and vector mesons, respectively) via triangle loop diagrams. We use the experimental upper limit on Z_c(3900)→ πω to constrain the cutoff parameter for both the dipole and tripole form factors. Numerical results from the dipole form factor show that the branching ratios for Z_cs → πK^* can reach up to the order of 10^−2, which is of the same order of magnitude as the hidden charm decay modes and may be detected in future measurements. The branching ratios from tripole form factor are not consistent with those from the dipole form factor, indicating a certain degree of model dependence in the present work. The relative ratios of the branching ratios for different decay channels are found to be almost independent of the cutoff parameter. However, some ratios are highly dependent on the choice of the dipole or tripole form factor. The branching ratio of Z_cs → ηK^* is found to be highly sensitive to the η-η^′ mixing angle, while that for Z_cs → η^′ K^* is almost independent of the mixing angle, making it a clean channel for future experimental measurements.
ER -