Strange cousin of Z _c (4020/4025) as a tetraquark state*

Abstract

Motivated by the analogous properties of the $Z_c(3900/3885)$ and $Z_{cs}(3985/4000)$, we tentatively assign the $Z_c(4020/4025)$ as the $A\bar{A}$-type hidden-charm tetraquark state with the $J^{PC}=1^{+-}$, where the $A$ denotes the axialvector diquark states, and explore the $A\bar{A}$-type tetraquark states without strange, with strange and with hidden-strange via the QCD sum rules in a consistent way. Then we explore the hadronic coupling constants in the two-body strong decays of the tetraquark states without strange and with strange via the QCD sum rules based on rigorous quark-hadron duality, and acquire the partial decay widths and total decay widths. The present calculations support assigning the $Z_c(4020/4025)$ as the $A\bar{A}$-type tetraquark state with the $J^{PC}=1^{+-}$, while the predictions for its strange cousin $Z_{cs}$ state can be confronted to the experimental data in the future.Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

Bottomoniumlike tetraquarks in a chiral quark model

“…Meanwhile, one narrow resonance is obtained, and the complex energy is 3917+i1.1 MeV. Accordingly, it is consistent with several other theoretical works [24,31,[64][65][66][67], the Z c (3900) state can be well identified as a D D * resonance, whose molecular structure is presented in Table XIII. Particularly, the dominant component is about 44% D D * state in colorsinglet channel, and there is also a strong coupling between diquark-antidiquark (20%) and K-type (34%) configurations.…”

“…Theoretical analysis using effective field theories [31,64,65], QCD sum rules [24,66] and neural networks [67] have identified the Z c (3900) and Z c (4020) states as D D * arXiv:2303.15388v1 [hep-ph] 27 Mar 2023 and D * D * molecular resonances, respectively. Furthermore, to explain the mentioned states, charmonium-like compact tetraquarks and threshold bumps have been proposed in constituent quark model investigations [68,69].…”

Analysis of the strong decays of Pc(4312) as a pentaquark molecular state with QCD sum rules *

“…The 3D graphs of the g Z are shown in Figs. 3-11, one can clearly see that "flat surfaces" are derived for all the hadronic coupling constants, which also presents a reference that it is reasonable to simply set T 2 1 = T 2 2 [23,30,31,42]. For the error bounds of the hadronic coupling constants, we follow the approximations δλP λP =…”

“…to estimate the uncertainties [31,42], what's more, we abandon the error bounds due to the uncertainties of the free parameters δC Z [23,30,31,42]. Since it is not clear to show the error bounds on the 3D graphs, we draw the curves of the uncertainties of the diagonals of the Borel platforms in Figs.3-11, and extract the numerical results in Table 1, it is clear that the strict constraint condition χ Z < 6% holds for all the Borel platforms.…”

Search for hidden-charm tetraquark with strangeness in *

“…, heavier partners of the might exist, which are denoted as . The state is expected to decay with large rate to the final state of , and has masses ranging from 4120 to 4200 MeV/ in different models [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32]. For example, is assumed to be a molecule with a mass of 4140 in Ref.…”