The isospin and compositeness of the $$T_{cc}(3875)$$ T cc
The isospin and compositeness of the $$T_{cc}(3875)$$ T cc
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DOI：
10.1140/epjc/s10052-023-12159-6
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发表时间：
2023-04
期刊：
影响因子：
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通讯作者：
L. Dai;L. Abreu;A. Feijoo;E. Oset
中科院分区：
文献类型：
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作者：
L. Dai;L. Abreu;A. Feijoo;E. Oset
为了确定其性质，我们对LHCb的数据进行了拟合。我们使用一个通用的框架，允许有thecomponents形成一个分子状态，以及一个可能的非分子状态或失踪的耦合通道的贡献。从拟合的数据，我们得出结论，观察到的状态显然是分子性质的thecomponents和非分子状态或丢失的通道的可能贡献小于3%，兼容零。我们还确定了该态具有同位旋，但由于所涉及的通道的质量不同，有一个较小的同位旋破缺，其通道的几率分别为69%和29%，不确定度为1%。这些概率之间的差异不应该被解释为测量同位旋破坏。由于同位旋出现的强相互作用的范围很短，所以同位旋的性质是由所发现的态与组分的耦合提供的，我们对这些耦合的结果表明，我们有一个具有非常小的同位旋破缺的态。我们还发现，所获得的潜力提供了一个排斥相互作用inpreventing形成anstate，在协议中所观察到的实验。
We perform a fit to the LHCb data on thestate in order to determine its nature. We use a general framework that allows to have thecomponents forming a molecular state, as well as a possible nonmolecular state or contributions from missing coupled channels. From the fits to the data we conclude that the state observed is clearly of molecular nature from thecomponents and the possible contribution of a nonmolecular state or missing channels is smaller than 3%, compatible with zero. We also determine that the state has isospinwith a minor isospin breaking from the different masses of the channels involved, and the probabilities of thechannels are of the order of 69% and 29% with uncertainties of 1%. The differences between these probabilities should not be interpreted as a measure of the isospin violation. Due to the short range of the strong interaction where the isospin is manifested, the isospin nature is provided by the couplings of the state found to thecomponents, and our results for these couplings indicate that we have anstate with a very small isospin breaking. We also find that the potential obtained provides a repulsive interaction inpreventing the formation of anstate, in agreement with what is observed in the experiment.