Bound state nature of the exotic Zb states

被引：133

作者：

Cleven, M. ^{[1
,2
]}

Guo, F. -K. ^{[3
,4
]}

Hanhart, C. ^{[1
,2
]}

Meissner, U. -G. ^{[1
,2
,3
,4
]}

机构：

[1] Forschungszentrum Julich, Inst Adv Simulat, D-52425 Julich, Germany

[2] Forschungszentrum Julich, Julich Ctr Hadron Phys, Inst Kernphys, D-52425 Julich, Germany

[3] Univ Bonn, Helmholtz Inst Strahlen & Kernphys, D-53115 Bonn, Germany

[4] Univ Bonn, Bethe Ctr Theoret Phys, D-53115 Bonn, Germany

来源：

EUROPEAN PHYSICAL JOURNAL A | 2011年 / 47卷 / 10期

关键词：

HEAVY-QUARK; CHIRAL DYNAMICS; PARTICLES; TRANSITIONS; MESONS; DECAYS;

D O I：

10.1140/epja/i2011-11120-6

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

The assumption that the newly observed charged bottomonia states Z(b)(10610) and Z(b)(10650) are of molecular nature is confronted with the measured invariant-mass distributions for the transitions of the Y(5S) to the final states h(b)pi(+)pi(-) and h(b)(2P)pi(+)pi(-). It is shown that the assumption that the Z(b)(10610) and Z(b)(10650) are B (B) over bar* + c.c. and B*(B) over bar* bound states, respectively, with very small binding energies is consistent with the data. The calculation is based on a power counting for bottom meson loops, which is explicitly given up to two-loop in the framework of a nonrelativistic effective-field theory. We also show that if the Z(b) states are of molecular nature, then the data should not be analyzed by using a Breit-Wigner parametrization.

引用

页数：8

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