Measurement of the spin of the Ξ(1530) resonance

B. Aubert et al. (BABAR Collaboration)
Phys. Rev. D 78, 034008 – Published 11 August 2008

Abstract

The properties of the Ξ(1530) resonance are investigated in the Λc+Ξπ+K+ decay process. The data sample was collected with the BABAR detector at the SLAC PEP-II asymmetric-energy e+e collider operating at center-of-mass energies 10.58 and 10.54 GeV. The corresponding integrated luminosity is approximately 230fb1. The spin of the Ξ(1530) is established to be 3/2. The existence of an S-wave amplitude in the Ξπ+ system is inferred, and its interference with the Ξ(1530)0 amplitude provides the first clear demonstration of the Breit-Wigner phase motion expected for the Ξ(1530). The P1(cosθΞ) Legendre polynomial moment indicates the presence of a significant S-wave amplitude for Ξπ+ mass values above 1.6GeV/c2, and a dip in the mass distribution at approximately 1.7GeV/c2 is interpreted as due to the coherent addition of a Ξ(1690)0 contribution to this amplitude. This would imply JP=1/2 for the Ξ(1690). Attempts at fitting the Ξ(1530)0 line shape yield unsatisfactory results, and this failure is attributed to interference effects associated with the amplitudes describing the K+π+ and/or ΞK+ systems.

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  • Received 12 March 2008

DOI:https://doi.org/10.1103/PhysRevD.78.034008

©2008 American Physical Society

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Vol. 78, Iss. 3 — 1 August 2008

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