Eur. Phys. J. C (2009) 64: 373-386
https://doi.org/10.1140/epjc/s10052-009-1156-2

Regular Article - Theoretical Physics

Analysis of the Y(4140) and related molecular states with QCD sum rules

Department of Physics, North China Electric Power University, Baoding, 071003, People’s Republic of China

^* e-mail: wangzgyiti@yahoo.com.cn

Received: 8 July 2009
Revised: 25 August 2009
Published online: 30 September 2009

Abstract

In this article, we assume that there exist scalar , , and molecular states, and study their masses using the QCD sum rules. The numerical results indicate that the masses are about (250–500) MeV above the corresponding D ^*–, D _s ^* –, B ^*– and B _s ^* – thresholds, the Y(4140) is unlikely a scalar molecular state. The scalar , , and molecular states maybe not exist, while the scalar , , and molecular states maybe exist.