奇异五夸克的Gamov-Teller共振
Exotic pentaquarks as Gamov-Teller resonances
摘要：
如果颜色数Nc取得很大，重子和它们的激发可以用平均场方法来考虑。我们认为，重子中的平均场自发地打破了球对称和SU（3）味对称，但保留了空间和等空间中同时转动的SU（2）对称。平均场中的单夸克激发和夸克空穴激发，以及它们周围的SU（3）转动带决定了重子共振谱，当Nc=3时，这与实际情况符合得令人满意。这个方案的一个副产品是确认了轻五夸克重子Theta+ = uudds-bar是核物理学中早已知道的典型伽莫夫-泰勒共振。将同样的大Nc逻辑推广到粲（和底）重子，可以预言粲五夸克的反十夸克（15巴）重态，其中两个，Beta++_c = cuds-bar和Beta+_c = cuds-bar，可能是轻的，并且相对于强衰变是稳定的，应该被寻找。
英文摘要：
If the number of colors Nc is taken large, baryons and their excitations can be considered in a mean-field approach. We argue that the mean field in baryons breaks spontaneously the spherical and SU(3) flavor symmetries, but retains the SU(2) symmetry of simultaneous rotations in space and isospace. The one-quark and quark-hole excitations in the mean field, together with the SU(3) rotational bands about them determine the spectrum of baryon resonances, which turns out to be in satisfactory accordance with reality when one puts Nc=3. A by-product of this scheme is a confirmation of the light pentaquark baryon Theta+ = uudds-bar as a typical Gamov-Teller resonance long known in nuclear physics. An extension of the same large-Nc logic to charmed (and bottom) baryons leads to a prediction of a anti-decapenta (15-bar)-plet of charmed pentaquarks, two of which, Beta++_c = cuuds-bar and Beta+_c = cudds-bar, may be light and stable with respect to strong decays, and should be looked for.
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。
