Search for Υ ( 1 S , 2 S ) → Z + c Z ( ' ) c − and e + e − → Z + c Z ( ' ) c − at √ s = 10.52 , 10.58, and 10.867 GeV
The first search for double charged charmoniumlike state production in Υ(1S) and Υ(2S) decays and in e+e− annihilation at √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 Υ(1S) and Υ(2S) decays [B(Υ(1S,2S)→Z+cZ(')−c)×B(Z+c→π++c¯c) (c¯c=J/ψ, χc1(1P), ψ(2S))] and the product of Born cross section and branching fraction for e+e−→Z+cZ(')−c (σ(e+e−→Z+cZ(')−c)×B(Z+c→π++c¯c)) at √s=10.52, 10.58, and 10.867 GeV are determined. Here, Zc refers to the Zc(3900) and Zc(4200) observed in the πJ/ψ final state, the Zc1(4050) and Zc2(4250) in the πχc1(1P) final state, and the Zc(4050) and Zc(4430) in the πψ(2S)final state.
Physical Review D
Digital Object Identifier (DOI)
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