Abstract |
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The Xi(1690)0 resonance is observed in the Lambda anti-K0 channel in the decay Lambdac+ --> Lambda anti-K0 K+, from a data sample
corresponding to a total integrated luminosity of ~ 200 fb-1 recorded by the Babar detector at the PEPII asymmetric-energy e+ e-
collider operating at ~ 10.58 GeV and ~ 10.54 GeV center-of-mass energies.
A fit to the Dalitz plot intensity distribution corresponding to the coherent superposition
of amplitudes describing Lambda a0(980)+ and Xi(1690)0 K+ production yields (preliminary) mass and width values of
1684.7 +/- 1.3 (stat.) +2.2 -1.6 (syst.) MeV/c2, and
8.1 +3.9 -3.5 (stat.) +1.0 -0.9 (syst.) MeV, respectively, for the Xi(1690)0, while the spin is found to be consistent with
value of 1/2 on the basis of studies of the (Lambda KS) angular distribution.
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