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arXiv 1202.2239hep-phnucl-exnucl-th
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具有重夸克自旋对称性的粲重子共振和奇异重子共振

Charmed and strange baryon resonances with heavy-quark spin symmetry

O. Romanets, L. Tolos, C. Garcia-Recio, J. Nieves, L. L. Salcedo, R. G. E. Timmermans

摘要:

我们研究了由包含重夸克自旋对称性的么正重子-介子耦合道模型动态产生的粲重子共振和奇异重子共振。这是通过将SU(3)温伯格-友泽手征拉格朗日量扩展到SU(8)自旋-味道对称性加上适当的对称性破缺来实现的。该模型从赝标和矢量介子与$1/2^+$和$3/2^+$重子的s波相互作用中产生负宇称共振。研究了具有一个、两个和三个粲单位的所有同位旋、自旋和奇异扇区中的共振。我们的结果与来自多个设施(例如CLEO、Belle或BaBar合作组织)的实验数据以及其他理论模型进行了比较。我们的一些动态生成的状态可以很容易地分配给实验发现的共振,而其他人没有一个简单的识别,需要更多的数据和模型的完善汇编。特别是,我们确定的$Ξ_c(2790)$和$Ξ_c(2815)$共振作为一个重夸克自旋对称性双峰的可能候选人。

英文摘要:

We study charmed and strange baryon resonances that are generated dynamically by a unitary baryon-meson coupled-channel model which incorporates heavy-quark spin symmetry. This is accomplished by extending the SU(3) Weinberg-Tomozawa chiral Lagrangian to SU(8) spin-flavor symmetry plus a suitable symmetry breaking. The model produces resonances with negative parity from s-wave interaction of pseudoscalar and vector mesons with $1/2^+$ and $3/2^+$ baryons. Resonances in all the isospin, spin, and strange sectors with one, two, and three charm units are studied. Our results are compared with experimental data from several facilities, such as the CLEO, Belle or BaBar Collaborations, as well as with other theoretical models. Some of our dynamically generated states can be readily assigned to resonances found experimentally, while others do not have a straightforward identification and require the compilation of more data and also a refinement of the model. In particular, we identify the $Ξ_c(2790)$ and $Ξ_c(2815)$ resonances as possible candidates for a heavy-quark spin symmetry doublet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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