A study of heavy flavoured meson fragmentation functions in e+e− annihilation
A study of heavy flavoured meson fragmentation functions in e+e− annihilation
复制标题
e+e−湮灭中重味介子碎裂函数的研究
DOI：
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发表时间：
2005
期刊：
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通讯作者：
C. Oleari
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文献类型：
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作者：
M. Cacciari;P. Nason;C. Oleari
我们将e+e−湮没中重味介子碎裂谱的量子化学理论预测与CLEO、BELLE和LEP的数据进行了比较。我们在计算中考虑了几种影响：次序初始条件、演化和系数函数。软胶子效应以次于领先对数的精度恢复。在次前导精度下，还实现了进化过程中跨越门限的匹配条件。在CLEO和Belle数据中考虑了重要的初始态电磁辐射效应。我们发现，对于演化的定阶初始条件，只要选择相当简单的非微扰修正，CLEO和Belle的数据就能以惊人的精度进行拟合。然而，当演化为LEP能量时，拟合的碎裂函数并不能很好地代表由Aleph测量的D*碎裂光谱。为了协调CLEO/Belle和Aleph的结果，需要对介子谱的系数函数进行大的非微扰修正。表中列出了从FITS到E+e−碎片数据中提取的D/D*和B介子的非微扰参数。它们可用于在强子-强子、光子-强子和光子-光子碰撞中产生迷人的和底部的介子的理论预测。
We compare QCD theoretical predictions for heavy flavoured mesons fragmentation spectra in e+e− annihilation with data from CLEO, BELLE and LEP. We include several effects in our calculation: next-to-leading order initial conditions, evolution and coefficient functions. Soft-gluon effects are resummed at next-to-leading-log accuracy. A matching condition for the crossing of the bottom threshold in evolution is also implemented at next-to-leading order accuracy. Important initial-state electromagnetic radiation effects in the CLEO and BELLE data are accounted for. We find that, with reasonably simple choices of a non-perturbative correction to the fixed-order initial condition for the evolution, the data from CLEO and BELLE can be fitted with remarkable accuracy. The fitted fragmentation function, when evolved to LEP energies, does not however represent fairly the D* fragmentation spectrum measured by ALEPH. Large non-perturbative corrections to the coefficient functions of the meson spectrum are needed in order to reconcile CLEO/BELLE and ALEPH results. Non-perturbative parameters extracted from the fits to e+e− fragmentation data for D/D* and B mesons are tabulated. They can be employed in the theoretical predictions for the production of charmed and bottomed mesons in hadron-hadron, photon-hadron and photon-photon collisions.