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Journal Articles

Revisit the isospin violating decays of (3872)

Meng, L.*; Wang, G.-J.*; Wang, B.*; Zhu, S.-L.*

Physical Review D, 104(9), p.094003_1 - 094003_8, 2021/11

https://doi.org/10.1103/PhysRevD.104.094003

Times Cited Count：18 Percentile：81.3(Astronomy & Astrophysics)

The isospin violating decays of are revisited in a coupled-channel effective field theory. In a cutoff-independent formalism, we relate the coupling constants of with the two channels to the molecular wave function. The isospin violating decays of are obtained by two equivalent approaches, which amend some deficiencies about this issue in literature. In the quantum field theory approach, the isospin violating decays arise from the coupling constants of to two di-meson channels. In the quantum mechanics approach, the isospin violating is attributed to wave functions at the origin. We bridge the isospin violating decays of to its inner structure. Our results show that the proportion of the neutral channel in is over 80%. As a by-product, we find that the strong decay width and radiative decay width are about 30 keV and 10 keV, respectively, for the binding energy from -300 keV to -50 keV.

Journal Articles

Implications of the $Z_{cs}$ (3985) and $Z_{cs}$ (4000) as two different states

Meng, L.*; Wang, B.*; Wang, G.-J.*; Zhu, S.-L.*

Science Bulletin, 66(20), p.2065 - 2071, 2021/10

https://doi.org/10.1016/j.scib.2021.06.026

Times Cited Count：25 Percentile：89.87(Multidisciplinary Sciences)

Two recently found tetraquark resonances $Z_{cs}$ (3985) and $Z_{cs}$ (4000) are studied in a solvable nonrelativistic effective field theory. We include the possible violations of heavy quark spin symmetry and SU(3) flavor symmetry in a comprehensive approach. Our results show that the decay rates can be used to judge whether these resonances can be different states or not.

Journal Articles

Probing the long-range structure of the $T^{+}_{cc}$ with the strong and electromagnetic decays

Meng, L.*; Wang, G.-J.*; Wang, B.*; Zhu, S.-L.*

Physical Review D, 104(5), p.L051502_1 - L051502_8, 2021/09

https://doi.org/10.1103/PhysRevD.104.L051502

Times Cited Count：52 Percentile：98.27(Astronomy & Astrophysics)

We investigate the kinetically allowed strong and electromagnetic decays of the recently observed $T^+_{cc}$ . Our results show that the decay width of $T_{cc}to D^0D^0pi^+$ is the largest one, which is just the experimental observation channel. Our theoretical total strong and radiative widths are in favor of the $T_{cc}$ as a $D^{*+}D^0$ dominated bound state. Our calculation is cutoff-independent and without prior isospin assignment. The absolute partial widths and ratios of the different decay channels can be used to test the structure of $T_{cc}$ state when the updated experimental results are available.