Exotic 1-/- states in QCD sum rules

被引：33

作者：

Albuquerque, Raphael M. ^{[1
]}

Nielsen, Marina ^{[1
]}

da Silva, Romulo Rodrigues ^{[2
]}

机构：

[1] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

[2] Univ Fed Campina Grande, UAF, BR-58051970 Campina Grande, PB, Brazil

来源：

PHYSICAL REVIEW D | 2011年 / 84卷 / 11期

基金：

巴西圣保罗研究基金会;

关键词：

RENORMALIZATION; ALPHA(S); HADRONS; MASS;

D O I：

10.1103/PhysRevD.84.116004

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Using the QCD sum rules we test if the charmonium-like structure Y(4260), observed in the J/psi pi pi invariant mass spectrum, can be described as a exotic state, with a J/psi f(0)(980) molecular current with J(PC) = 1(-/-). By exotic we mean a more complex structure than the simple quark-antiquark state and not exotic JPC quantum numbers. We consider the contributions of condensates up to dimension six and we work at leading order in alpha(s). We keep terms which are linear in the strange quark mass m(s). The mass obtained for such state is m(Y) = (4.67 +/- 0.09) GeV, when the vector and scalar mesons are in color singlet configurations. We conclude that the proposed current can better describe the Y(4660) state that could be interpreted as a Psi(2S)f(0)(980) molecular state. We also use different J(PC) = 1(-/-) currents to study the recently observed Y-b(10890) state. Our findings indicate that the Y-b(10890) can be well described by a scalar-vector tetraquark current.

引用

页数：9

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