Phenomenology of Pc(4380)+, Pc(4450)+ and related states

被引：131

作者：

Burns, T. J. ^{[1
]}

机构：

[1] Swansea Univ, Dept Phys, Singleton Pk, Swansea SA2 8PP, W Glam, Wales

来源：

EUROPEAN PHYSICAL JOURNAL A | 2015年 / 51卷 / 11期

关键词：

QUARK; X(3872); BARYONS; EXCHANGE;

D O I：

10.1140/epja/i2015-15152-6

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 P-c(4380)(+) and P-c(4450)(+) states recently discovered at LHCb have masses close to several relevant thresholds, which suggests they can be described in terms of meson-baryon degrees of freedom. This article explores the phenomenology of these states, and their possible partners, from this point of view. Competing models can be distinguished by the masses of the neutral partners which have yet to be observed, and the existence or otherwise of further partners with different isospin, spin, and parity. Future experimental studies in different decay channels can also discriminate among models, using selection rules and algebraic relations among decays. Among the several possible meson-baryon pairs which could be important, one implies that the states are mixtures of isospins 1/2 and 3/2, with characteristic signatures in production and decay. A previous experimental study of a Cabibbo-suppressed decay showed no evidence for the states, and further analysis is required to establish the significance of this non-observation. Several intriguing similarities suggest that P-c(4450)(+) is related to the X(3872) meson.

引用

页码：1 / 16

页数：16

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