Hidden-beauty charged tetraquarks and heavy quark spin conservation

被引：35

作者：

Ali, A. ^{[1
]}

Maiani, L. ^{[2
,3
]}

Polosa, A. D. ^{[2
,3
]}

Riquer, V. ^{[2
,3
]}

机构：

[1] DESY, D-22607 Hamburg, Germany

[2] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy

[3] INFN, Sez Roma, I-00185 Rome, Italy

来源：

PHYSICAL REVIEW D | 2015年 / 91卷 / 01期

关键词：

SEARCH;

D O I：

10.1103/PhysRevD.91.017502

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Assuming the dominance of the spin-spin interaction in a diquark, we point out that the mass difference in the beauty sector M(Z(b)')(+/-) - M(Z(b))(+/-) scales with quark masses as expected in QCD, with respect to the corresponding mass difference M(Z(c)')(+/-) - M(Z(c))(+/-). Notably, we show that the decays Upsilon(10890) -> Upsilon(nS)pi(+)pi(-) and Upsilon(10890) -> (h(b)(1P), h(b)(2P))pi(+)pi(-) are compatible with heavy quark spin conservation if the contributions of Z(b), Z(b)' intermediate states are taken into account, Upsilon(10890) being either a Upsilon(5S) or the beauty analog of Y-c(4260). Belle results on these decays support the quark spin wave function of the Z states as tetraquarks. We also consider the role of light quark spin nonconservaton in Z(b),Z(b)' decays into BB* and B*B*. Indications of possible signatures of the still missing X-b resonance are proposed.

引用

页数：4

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