Substructure of Multiquark Hadrons (White Paper)-猫眼课题宝

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Nora Brambilla;Hua-Xing Chen;A. Esposito;Jacopo Ferretti;Anthony Francis;Feng-Kun Guo;C. Hanhart;Atsushi Hosaka;Robert L. Jaﬀe;M. Karliner;Richard F. Lebed;Randy Lewis;L. Maiani;Nilmani Mathur;Ulf-G Meißner;A. Pilloni;A. Polosa;S. Prelovsek;Jean-Marc Richard;V. Riquer;M. Rosina;Jonathan L. Rosner;E. Santopinto;E. Swanson;A. Szczepaniak;S. Takeuchi;Makoto Takizawa;Frank Wilczek

近年来，有越来越多的实验证据表明，存在奇异的多夸克强子，即除了通常的夸克-反夸克对和重子（由三个以上的夸克组成）之外，还含有额外夸克的介子。在所有具有强有力证据的情况下，它们至少包含一个重夸克Q = c或B，大多数包含两个重夸克。这些发现引发了两个关键的理论问题：（1）夸克在这些多夸克态中是如何组织的--作为所有夸克都在一个约束体积内的紧凑物体，通过色力相互作用，也许双夸克扮演着重要的角色，或者作为类似氘的强子分子，通过光介子交换结合在一起？(b)我们还能期待什么样的多夸克态呢这两个问题紧密地交织在一起。每一种解释都提供了对部分数据的自然解释，但两者都不是。

In recent years there has been a rapidly growing body of experimental evidence for existence of exotic, multiquark hadrons , i.e. mesons which contain additional quarks, beyond the usual quark-antiquark pair and baryons which consist of more than three quarks. In all cases with robust evidence they contain at least one heavy quark Q = c or b , the majority including two heavy quarks. Two key theoretical questions have been triggered by these discoveries: (a) how are quarks organized inside these multiquark states – as compact objects with all quarks within one conﬁnement volume, interacting via color forces, perhaps with an important role played by diquarks, or as deuteron-like hadronic molecules, bound by light-meson exchange? (b) what other multiquark states should we expect? The two questions are tightly intertwined. Each of the interpretations provides a natural explanation of parts of the data, but neither

Substructure of Multiquark Hadrons (White Paper)

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