Volume 85, Number 6, March 2009
Article Number 61002
Number of page(s) 6
Section The Physics of Elementary Particles and Fields
Published online 07 April 2009
EPL, 85 (2009) 61002
DOI: 10.1209/0295-5075/85/61002

Possible ${\psi(5S)}$, ${\psi(4D)}$, ${\psi(6S)}$, and ${\psi(5D)}$ signals in ${\Lambda_{c}\bar{\Lambda}_{c}}$

E. van Beveren1, X. Liu1, R. Coimbra1 and G. Rupp2

1   Centro de Física Computacional, Departamento de Física, Universidade de Coimbra - P-3004-516 Coimbra, Portugal, EU
2   Centro de Física das Interacções Fundamentais, Instituto Superior Técnico, Technical University of Lisbon P-1049-001 Lisboa, Portugal, EU

received 5 September 2008; accepted in final form 5 March 2009; published March 2009
published online 7 April 2009

It is shown that the $\Lambda _{c}^{+}\Lambda _{c}^{-}$ signal recently reported by the Belle Collaboration (Phys. Rev. Lett., 101 (2008) 172001) contains clear signs of the ${\psi(5S)}$ and the $\psi (4D)\, c\bar{c} $ 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 $\Lambda _{c}^{+}\Lambda _{c}^{-}$ cross-section suggests the presence of the hitherto undetected $\psi (3D)$ state not far below the $\Lambda _{c}^{+}\Lambda _{c}^{-}$ threshold.

14.40.Gx - Mesons with S = C = B = 0, mass > 2.5 GeV (including quarkonia).
13.60.Rj - Baryon production.
14.20.Lq - Charmed baryons.

© EPLA 2009