Search for a pentaquark state decaying into pJ/ψ in Υ(1, 2S) inclusive decays at Belle

Abstract

Using the data samples of 102 million Υ(1S) and 158 million Υ(2S) events collected by the Belle detector, we search for a pentaquark state in the pJ/ψ final state from Υ(1, 2S) inclusive decays. Here, the charge-conjugate is included. We observe clear pJ/ψ production in Υ(1, 2S) decays and measure the branching fractions to be and. We also measure the cross section of inclusive pJ/ψ production in e+e− annihilation to be σ(e+e− → pJ/ψ + anything) = [108 ± 11(stat.) ± 6(syst.)] fb at GeV using an 89.5 fb−1 continuum data sample. There is no significant Pc(4312)+, Pc(4440)+ or Pc(4457)+ signal found in the pJ/ψ final states in Υ(1, 2S) inclusive decays. We determine the upper limits of to be at..