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arXiv 0907.3167hep-ph
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X(3872)的J/psi π + π-和D0 D0-bar pi0衰变分析

Analysis of J/psi pi+ pi- and D0 D0-bar pi0 Decays of the X(3872)

Eric Braaten James Stapleton

摘要:

我们分析了最近的数据从巴巴尔和贝尔合作的X(3872)共振在J/psi π + π-和D 0 D 0-酒吧π 0衰变通道,仔细考虑的S波阈值共振的普遍特征。因为这种共振的线形不是能量的可积函数,所以共振参数取决于用于定义它们的规定。在最近对D 0 D 0-bar通道的实验分析中,假设D*0 D 0-bar阈值附近的事件来自D*0 D 0-bar或D 0 D 0 *-bar,因此被分配了高于阈值的能量。考虑到这一影响,我们对D 0 D 0-bar pi 0数据的分析给出了X(3872)的质量,该质量低于D*0 D^0-bar阈值。我们在J/psi π + π-和D 0 D 0-bar π 0通道中的分析与X(3872)作为极弱束缚粲介子分子的鉴定是一致的。

英文摘要:

We analyze recent data from the Babar and Belle Collaborations on the X(3872) resonance in the J/psi pi+ pi- and D0 D0-bar pi0 decay channels, taking careful account of the universal features of an S-wave threshold resonance. Because the line shapes for such a resonance are not integrable functions of the energy, the resonance parameters depend on the prescriptions used to define them. In recent experimental analyses of the D0 D0-bar pi0 channel, an event near the D*0 D0-bar threshold was assumed to come from D*0 D0-bar or D0 D0*-bar and was therefore assigned an energy above the threshold. Taking this effect into account, our analysis of the D0 D0-bar pi0 data gives a mass for the X(3872) that is below the D*0 D^0-bar threshold. Our analyses in both the J/psi pi+ pi- and D0 D0-bar pi0 channels are consistent with the identification of the X(3872) as an extremely weakly-bound charm meson molecule.

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