Measurement of the Mass and Width and Study of the Spin of the Xi(1690)0 Resonance from Lambdac+ --> Lambda anti-K0 K+ Decay at Babar

TL;DR

This paper reports the measurement of the mass, width, and spin of the Xi(1690)0 resonance observed in Lambda anti-K0 decay, using data from the BaBar detector, providing precise resonance parameters and confirming its spin as 1/2.

Contribution

First precise measurement of the Xi(1690)0 resonance's mass, width, and spin from Babar data in Lambda anti-K0 decay channel.

Findings

Mass of 1684.7 MeV/c2 with small uncertainties

Width of approximately 8 MeV

Spin consistent with 1/2

Abstract

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 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.