Eur. Phys. J. C (2009) 62: 375-382
https://doi.org/10.1140/epjc/s10052-009-1043-x

Regular Article - Theoretical Physics

Another tetraquark structure in the π ⁺ χ _c1 invariant mass distribution

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

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

Received: 24 December 2008
Revised: 20 March 2009
Published online: 20 May 2009

Abstract

In this article, we assume that there exists a scalar hidden charm tetraquark state in the π ⁺ χ _c1 invariant mass distribution, and we study its mass using the QCD sum rules. The numerical result M _Z =(4.36±0.18) GeV is consistent with the mass of the Z(4250). The Z(4250) may be a tetraquark state, but other possibilities, such as a hadro-charmonium resonance and a molecular state, are not excluded.