Pentaquarks with hidden charm as hadroquarkonia
Pentaquarks with hidden charm as hadroquarkonia
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DOI：
10.1140/epjc/s10052-018-5530-9
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发表时间：
2017-09
期刊：
影响因子：
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通讯作者：
M. I. Eides;V. Petrov;M. Polyakov
中科院分区：
文献类型：
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作者：
M. I. Eides;V. Petrov;M. Polyakov
在QCD的启发下，我们把隐魅五夸克态看作是强子偶素态。五夸克态是夸克偶素激发态和普通重子的束缚态。LHCb五夸克态被解释为具有自旋宇称的α-核子束缚态。计算了部分衰变宽度MeV，与实验数据符合较好。预言五夸克态是两个几乎简并的具有自旋宇称的隐魅重子八重态之一。计算了八重态五夸克态的质量和衰变宽度。八重态五夸克态的宽度很小，与五夸克态的宽度相当，质量满足Gell-Mann-Okubo关系。五夸克作为松散的boundanddeuteronlike状态的解释也被考虑。我们确定了这些束缚态的量子数，并计算了它们在一π交换方案中的质量。比较了研究奇异强子的强子夸克偶素方法和分子方法，并讨论了各自的优缺点。
We consider hidden charm pentaquarks as hadroquarkonium states in a QCD inspired approach. Pentaquarks arise naturally as bound states of quarkonia excitations and ordinary baryons. The LHCbpentaquark is interpreted as a-nucleon bound state with spin-parity. The partial decay widthMeV is calculated and turned out to be in agreement with the experimental data for. Thepentaquark is predicted to be a member of one of the two almost degenerate hidden-charm baryon octets with spin-parities. The masses and decay widths of the octet pentaquarks are calculated. The widths are small and comparable with the width of thepentaquark, and the masses of the octet pentaquarks satisfy the Gell-Mann–Okubo relation. Interpretation of pentaquarks as loosely boundanddeuteronlike states is also considered. We determine quantum numbers of these bound states and calculate their masses in the one-pion exchange scenario. The hadroquarkonium and molecular approaches to exotic hadrons are compared and the relative advantages and drawbacks of each approach are discussed.