Evidence of the P$_{c\bar{c}s}$(4459)$^0$ in Upsilon(1S, 2S) inclusive decays at Belle

Using data samples of 102 million Upsilon(1S) events and 158 million Upsilon(2S) events collected by the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider, we search for [udsccbar] pentaquark states decaying to Jpsi Lambda. Using the first observations of Upsilon(1S, 2S) inclusive decays to Jpsi Lambda, we find evidence of the $P_{cc\bar{s}}(4459)^0$ state with a significance of 3.3 standard deviations, including statistical and systematic uncertainties. We measure the mass and width of the $P_{cc\bar{s}}(4459)^0$ to be (4471.7 +- 4.8 +- 0.6) MeV/c2 and (21.9 +- 13.1 +- 2.7) MeV, respectively. The branching fractions for $P_{cc\bar{s}}(4459)^0$ production are measured to be B[Upsilon(1S) -> $P_{cc\bar{s}}(4459)^0$/ Pbar_ccbars(4459)0 + anything] = (3.5 +- 2.0 +- 0.2)*10$^{-6}$ and B[Upsilin(2S) -> $P_{cc\bar{s}}(4459)^0$/ Pbar_ccbars(4459)0 +anything] = (2.9 +- 1.7 +- 0.4)*10$^{-6}$. The inclusive branching fractions of Upsilon(1S, 2S) -> Jpsi Lambda/Lambdabar are measured to be B[Upsilin(1S) -> Jpsi Lambda/Lambdabar + anything] = (36.9 +- 5.3 +- 2.4)*10-6 and B[Upsilon(2S) -> Jpsi Lambda/Lambdabar + anything] = (22.3 +- 5.7 +- 3.1)*10-6. We measure the visible cross section $\sigma(e^+e^- \to J/psi \Lambda/\bar\Lambda$ + anything) = (90 +- 14 +- 6) fb for the continuum production at $\sqrt{s} = 10.52$ GeV. In all cases, the first uncertainties are statistical and the second are systematic.