Eur. Phys. J. C (2009) 64: 297-308
https://doi.org/10.1140/epjc/s10052-009-1146-4

Regular Article - Theoretical Physics

Possible molecular states of system and Y(4140)

Department of Modern Physics, University of Science and Technology of China, Hefei, Anhui, 230026, China

^* e-mail: dinggj@ustc.edu.cn

Received: 4 August 2009
Published online: 19 September 2009

Abstract

The interpretation of Y(4140) as a molecule is studied dynamically in the one boson exchange approach, where σ, η and φ exchange are included. Ten allowed states with low spin parity are considered, and we find that the J ^PC =0⁺⁺, 1⁺⁻, 0⁻⁺, 2⁺⁺ and 1⁻⁻ configurations are most tightly bound. We suggest that the most favorable quantum numbers are J ^PC =0⁺⁺ for Y(4140) as a molecule; however, J ^PC =0⁻⁺ and 2⁺⁺ cannot be excluded. We propose to search for the 1⁺⁻ and 1⁻⁻ partners in the J/ψ η and J/ψ η′ final states, which is an important test of the molecular hypothesis of Y(4140) and the reasonability of our model. The 0⁺⁺ molecule should be deeply bound; experimental search in the ϒ(1S)φ channel at Tevatron and LHC is suggested.