Investigation of box diagrams for the peak of $$Z_{cs}(3985)$$ Z cs ( 3985 ) in $$e^+e^- \rightarrow D^-_s D^{*0} K^+$$ e + e - → D s - D ∗ 0 K + and $$ D^{*-}_s D^0 K^+$$ D s ∗ - D 0 K +
Abstract The BESIII Collaboration recently observed a charged hidden-charm structure with strangeness in the recoil mass spectrum of $$K^+$$ K + in the processes $$e^+e^- \rightarrow D^-_s D^{*0} K^+$$ e + e - → D s - D ∗ 0 K + or $$D^{*-}_s D^0 K^+$$ D s ∗ - D 0 K + , named as $$Z_{cs}(3985)^-$$ Z...
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| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-05-01
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| Series: | European Physical Journal C: Particles and Fields |
| Online Access: | https://doi.org/10.1140/epjc/s10052-025-14247-1 |
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| Summary: | Abstract The BESIII Collaboration recently observed a charged hidden-charm structure with strangeness in the recoil mass spectrum of $$K^+$$ K + in the processes $$e^+e^- \rightarrow D^-_s D^{*0} K^+$$ e + e - → D s - D ∗ 0 K + or $$D^{*-}_s D^0 K^+$$ D s ∗ - D 0 K + , named as $$Z_{cs}(3985)^-$$ Z cs ( 3985 ) - . Within the energy region around the peak of $$Z_{cs}(3985)$$ Z cs ( 3985 ) , various box diagrams are present. A systematic study of these box diagrams reveals the existence of a box singularity. Dalitz plots and invariant mass distributions of two charmed mesons from the box diagram for the processes $$e^+e^- \rightarrow D^-_s D^{*0} K^+$$ e + e - → D s - D ∗ 0 K + and $$D^{*-}_s D^0 K^+$$ D s ∗ - D 0 K + are presented at five energy points $$\sqrt{s} = 4.628,\,4.641,\,4.661,\,4.681$$ s = 4.628 , 4.641 , 4.661 , 4.681 , and 4.698 GeV. It is found that these box diagrams can generate peaks similar to those observed in experiments, suggesting that the peak of $$Z_{cs}(3985)$$ Z cs ( 3985 ) may be attributed to the box singularity contribution. Additionally, slight differences in the invariant mass spectra of $$D^-_s D^{*0}$$ D s - D ∗ 0 and $$D^{*-}_s D^0 $$ D s ∗ - D 0 are identified based on the box diagrams, needing further experimental validation. |
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| ISSN: | 1434-6052 |