Kavli Affiliate: T. Higuchi
| First 5 Authors: I. Adachi, L. Aggarwal, H. Ahmed, J. K. Ahn, H. Aihara
| Summary:
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_ccbars(4459)0 state
with a significance of 3.3 standard deviations, including statistical and
systematic uncertainties. We measure the mass and width of the Pccbars(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_ccbars(4459)0 production are
measured to be B[Upsilon(1S) -> P_ccbars(4459)0/ Pbar_ccbars(4459)0 + anything]
= (3.5 +- 2.0 +- 0.2)*10-6 and B[Upsilin(2S) -> P_ccbars(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- -> Jpsi
Lambda/Lambdabar + 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.
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