AbstractVery recently, the BESIII Collaboration reported a charged hidden-charm structure with strangeness in the recoil mass of $$K^+$$
K
+
of a process $$e^+e^-\rightarrow D_s^{*-}D^0K^+$$
e
+
e
-
→
D
s
∗
-
D
0
K
+
or $$D_s^{-}D^{*0}K^+$$
D
s
-
D
∗
0
K
+
, which is named as $$Z_{cs}(3985)^{-}$$
Z
cs
(
3985
)
-
. The newly observed charged structure can be treated as a partner structure with strangeness of well-known $$Z_{c}(3885)^{-}$$
Z
c
(
3885
)
-
reported in a process $$e^+e^-\rightarrow D^{*-}D^0\pi ^+$$
e
+
e
-
→
D
∗
-
D
0
π
+
. In this work, we propose a reflection picture to understand the nature of $$Z_{cs}(3985)$$
Z
cs
(
3985
)
. By performing a combined analysis for the line shape of the recoil mass distribution of $$K^+$$
K
+
at five energy points $$\sqrt{s}=4.628, 4.641, 4.661, 4.681, 4.698$$
s
=
4.628
,
4.641
,
4.661
,
4.681
,
4.698
GeV, we find that the $$Z_{cs}(3985)$$
Z
cs
(
3985
)
can be explained as a reflection structure of charmed-strange meson $$D_{s2}^{*}(2573)$$
D
s
2
∗
(
2573
)
, which is produced from the open-charm decay of Y(4660) with a $$D_s^*$$
D
s
∗
meson. Furthermore, we predicted the angular distribution of final state $$D_s^{*-}$$
D
s
∗
-
in process $$e^+e^-\rightarrow D_s^{*-}D^0K^+$$
e
+
e
-
→
D
s
∗
-
D
0
K
+
based on our proposed reaction mechanism, which may be an essential criterion to test the non-resonant nature of $$Z_{cs}(3985)$$
Z
cs
(
3985
)
further.
Nuclear gluon shadowing via dileptons from open charm decay in p + A at
