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Tetraquark interpolating fields in a lattice QCD investigation of the Ds0*(2317) meson

机译:Tetraquark插值领域在DS0 *(2317)中的QCD调查中的QCD调查

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We investigate the D s 0 * ( 2317 ) meson using lattice QCD and considering correlation functions of several c ˉ s two-quark and c ˉ s ( u ˉ u + d ˉ d ) four-quark interpolating fields. These interpolating fields generate different structures in color, spin and position space including quark-antiquark pairs, tetraquarks and two-meson scattering states. For our computation we use an ensemble simulated with pion mass m π ≈ 0.296 ? ? GeV and spatial volume of extent 2.90?fm. We find in addition to the expected spectrum of two-meson scattering states another state around 60?MeV below the D K threshold, which we interpret as the D s 0 * ( 2317 ) meson. This state couples predominantly to a quark-antiquark interpolating field and only weakly to a D K two-meson interpolating field. The coupling to the tetraquark interpolating fields is essentially 0, rendering a tetraquark interpretation of the D s 0 * ( 2317 ) meson rather unlikely. Moreover, we perform a scattering analysis using Lüscher’s method and the effective range approximation to determine the D s 0 * ( 2317 ) mass for infinite spatial volume. We find this mass 51?MeV below the D K threshold, rather close to both our finite volume result and the experimentally observed value.
机译:我们使用格子QCD调查D S 0 *(2317)MESON,并考虑多个Cˉ的双夸克和Cˉs(u u u + d≠d)四夸克内插字段的相关函数。这些内插场在包括夸克 - 古地克对,四面图和两个偏移散射状态的颜色,旋转和位置空间中产生不同的结构。对于我们的计算,我们使用在π0.296的πμmπ≈0.296模拟的集合还GEV和空间体积2.90?FM。除了两思逊散射状态的预期谱不同之外,我们还发现另一种状态约为60?MEV以下D k阈值,我们将其解释为D S 0 *(2317)MESON。该状态主要耦合到夸克 - 古地克插值场,并且仅弱到D k两秒秒内插场。与TetraQuark插值场的耦合基本上为0,渲染D S 0 *(2317)偏振片的Tetraquark解释而是不太可能的。此外,我们使用Lüscher的方法和有效范围近似来执行散射分析,以确定无限空间体积的D S 0 *(2317)质量。我们在D k阈值下方找到了这个质量51?MEV,而是接近我们的有限体积结果和实验观察的值。

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