Eur. Phys. J. C (2016) 76: 387
https://doi.org/10.1140/epjc/s10052-016-4238-y

Regular Article - Theoretical Physics

Tetraquark state candidates: Y(4260), Y(4360), Y(4660), and

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

^* e-mail: zgwang@aliyun.com

Received: 18 May 2016
Accepted: 28 June 2016
Published online: 8 July 2016

Abstract

In this article, we construct the axialvector-diquark–axialvector-antidiquark type tensor current to interpolate both the vector- and the axialvector-tetraquark states, then calculate the contributions of the vacuum condensates up to dimension 10 in the operator product expansion, and we obtain the QCD sum rules for both the vector- and the axialvector-tetraquark states. The numerical results support assigning the to be the diquark–antidiquark type tetraquark state, and assigning the Y(4660) to be the diquark–antidiquark type tetraquark state. Furthermore, we take the Y(4260) and Y(4360) as the mixed charmonium–tetraquark states, and we construct the two-quark–tetraquark type tensor currents to study the masses and pole residues. The numerical results support assigning the Y(4260) and Y(4360) to be the mixed charmonium–tetraquark states.