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arXiv 1810.04492hep-phhep-ex
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激发态重介子衰变为轻矢量介子:光谱学意义

Excited heavy meson decays to light vector mesons: implications for spectroscopy

S. Campanella, P. Colangelo, F. De Fazio

摘要:

利用基于重夸克对称性的有效场论和基于隐藏的规范对称性的有效场理论,分析了激发态粲介子和美介子强衰变为轻矢量介子的过程. HQ对称性允许将重介子分类为自旋二重态,并将激发态的衰变联系起来。我们建立了控制${\cal H}_i \to P^{(*)} V$模的有效拉格朗日项,其中${\cal H}_i$是激发态$s$,$p$,$d$和$f$ -波重轻夸克介子,$P,\,P^*$是最底层的$J^P=(0^-,\,1^-)$重轻介子,V是轻矢量介子.预测的衰减宽度的比率是独立的强耦合的有效拉格朗日项。对新观测到的重-轻介子进行了分类。

英文摘要:

We analyze strong decays of excited charmed and beauty mesons into a light vector meson, exploiting the effective field theory based on heavy quark (HQ) symmetries for heavy mesons, and on the hidden gauge symmetry to incorporate light vector mesons. HQ symmetries allow to classify the heavy mesons in spin doublets, and to relate decays of excited states. We build effective Lagrangian terms governing the ${\cal H}_i \to P^{(*)} V$ modes, with ${\cal H}_i$ an excited $s$, $p$, $d$ and $f$-wave heavy-light quark meson, $P,\,P^*$ the lowest-lying $J^P=(0^-,\,1^-)$ heavy-light mesons, and V a light vector meson. Predictions are provided for ratios of decay widths that are independent of the strong couplings in the effective Lagrangian terms. A classification of the newly observed heavy-light mesons is proposed.

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