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arXiv 1208.4468hep-ex
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HERA激发态粲介子D_1和D^*_2的产生

Production of the excited charm mesons D_1 and D^*_2 at HERA

ZEUS Collaboration

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31 pages, 6 figures
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摘要：

用HERA的ZEUS探测器测量了激发态粲介子D_1（2420）和D^*_2（2460）在ep碰撞中的产生，其积分亮度为373 pb^{-1}。中性态和带电态的质量、中性态的宽度和D_1（2420）^{0}的螺旋度参数被确定，并与其他测量和理论预期进行了比较。测量到的D ^0_1的螺旋度参数允许S波和D波在其衰减到D^{* \pm }π^{ \mp }的过程中有一定程度的混合。结果也与纯D波衰减一致。测量了D^*_2（2460）^0和D^*_2（2460）^{ \pm }态的两个衰变模的分支分数比，并与以前的测量结果进行了比较。测量了粲夸克强子化为D_1和D^{*}_2的比例，与e^+ e^-湮灭的结果一致。

英文摘要：

The production of the excited charm mesons D_1(2420) and D^*_2(2460) in ep collisions has been measured with the ZEUS detector at HERA using an integrated luminosity of 373 pb^{-1}. The masses of the neutral and charged states, the widths of the neutral states, and the helicity parameter of D_1(2420)^{0} were determined and compared with other measurements and with theoretical expectations. The measured helicity parameter of the D^0_1 allows for some mixing of S- and D-waves in its decay to D^{*\pm}π^{\mp}. The result is also consistent with a pure D-wave decay. Ratios of branching fractions of the two decay modes of the D^*_2(2460)^0 and D^*_2(2460)^{\pm} states were measured and compared with previous measurements. The fractions of charm quarks hadronising into D_1 and D^{*}_2 were measured and are consistent with those obtained in e^+ e^- annihilations.

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