Possible psi(5S), psi(4D), psi(6S) and psi(5D) signals in Lambda(c)-antiLambda(c)

TL;DR

This paper analyzes the Lambda(c)-antiLambda(c) signal and suggests it contains evidence for multiple psi states, including psi(5S), psi(4D), psi(6S), psi(5D), and possibly psi(3D), based on recent experimental data.

Contribution

It provides the first indication of several higher psi states in the Lambda(c)-antiLambda(c) signal, expanding the understanding of charmonium spectroscopy.

Findings

Evidence for psi(5S) and psi(4D) states in the signal.

Possible indications of psi(6S) and psi(5D) states.

Suggestion of an undetected psi(3D) state near threshold.

Abstract

It is shown that the Lambda(c+)-Lambda(c-) signal recently reported by the Belle Collaboration (ARXIV:0807.4458) contains clear signs of the psi(5S) and the psi(4D) c-cbar vector states, and also some indication for the masses and widths of the psi(6S) and psi(5D). Moreover, it is argued that the threshold behaviour of the Lambda(c+)-antiLambda(c-) cross sections suggests the presence of the hitherto undetected psi(3D) state not far below the Lambda(c+)-Lambda(c-) threshold.