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Search for $$Upsilon(1S,2S) to Z^{+}_{c}Z^{(prime) -}_{c}$$ and $$e^{+}e^{-} to Z^{+}_{c}Z^{(prime) -}_{c}$$ at $$sqrt{s}$$ = 10.52, 10.58, and 10.867 GeV

$$sqrt{s}$$=10.52, 10.58, 10.867GeVにおける$$Upsilon(1S,2S) to Z^{+}_{c}Z^{(prime) -}_{c}$$および$$e^{+}e^{-} to Z^{+}_{c}Z^{(prime) -}_{c}$$の探索

Jia, S.*; 谷田 聖; Belle Collaboration*; 他181名*

Jia, S.*; Tanida, Kiyoshi; Belle Collaboration*; 181 of others*

The first search for $$Z_{c}$$ pair production in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays and in $$e^{+}e^{-}$$ annihilation at $$sqrt{s}$$ = 10.52, 10.58, and 10.867 GeV is conducted using data collected with the Belle detector at the KEKB asymmetric energy electron-positron collider. No significant signals are observed in any of the studied modes, and the 90% credibility level upper limits on their product branching fractions in $$Upsilon(1S)$$ and $$Upsilon(2S)$$ decays ($${cal B}(Upsilon(1S,2S)to Z^{+}_{c}Z^{(prime) -}_{c})times{cal B}(Z^{+}_{c}topi^{+}+cbar c)$$ ($$cbar c=J/psi$$, $$chi_{c1}(1P)$$, $$psi(2S)$$)) and the product of Born cross section and branching fraction for $$e^{+}e^{-} to Z^{+}_{c}Z^{(prime) -}_{c}$$ ($$sigma(e^+e^- to Z^{+}_{c}Z^{(prime) -}_{c})times {cal B}(Z^{+}_{c} to pi^+ +cbar c)$$) at $$sqrt{s}$$ = 10.52, 10.58, and 10.867 GeV are determined. Here, $$Z_{c}$$ refers to the $$Z_{c}(3900)$$ and $$Z_{c}(4200)$$ observed in the $$pi J/psi$$ final state, the $$Z_{c1}(4050)$$ and $$Z_{c2}(4250)$$ in the $$pichi_{c1}(1P)$$ state, and the $$Z_{c}(4050)$$ and $$Z_{c}(4430)$$ in the $$pipsi(2S)$$ state.

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パーセンタイル:100

分野:Astronomy & Astrophysics

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