arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1306.1612hep-ph
收藏

在全球分析中包括自旋不对称数据的π介子和K介子碎裂函数的确定

Determination of pion and kaon fragmentation functions including spin asymmetries data in a global analysis

M. Soleymaninia, A. N. Khorramian, S. M. Moosavi Nejad, F. Arbabifar

摘要:

我们提出了新的函数形式的π介子和K介子碎裂函数的次领先的顺序获得通过整体拟合单包电子正电子湮没数据,也采用,半包深非弹性散射不对称数据从HERMES和COMPASS确定碎裂函数。此外,我们应用最近从BaBar和Belle在$\sqrt{s}=10.54$ GeV和$\sqrt{s}=10.52$ GeV的电子正电子湮没数据,分别。在这个分析中,我们认为印象的半包容性深非弹性散射不对称数据的碎裂功能,其中产生的强子不同的电荷被确定。利用非对称性数据,我们打破了有利部分子的夸克和反夸克碎裂函数之间的对称性假设。我们的分析结果与电子正电子湮没数据和所有的半包容深非弹性散射不对称数据吻合得很好。利用碎裂函数的普适性和标度违反,我们采用零质量变味数方案,将得到的碎裂函数应用于预测次领先阶顶夸克衰变中包含产生的$π^+/K^+$的标度能量分布.

英文摘要:

We present new functional form of pion and kaon fragmentation functions up to next-to-leading order obtained through a global fit to single-inclusive electron-positron annihilation data and also employ, the semi-inclusive deep inelastic scattering asymmetry data from HERMES and COMPASS to determine fragmentation functions. Also we apply very recently electron-positron annihilation data from BaBar and Belle at $\sqrt{s}=10.54$ GeV and $\sqrt{s}=10.52$ GeV, respectively. In this analysis we consider the impression of semi-inclusive deep inelastic scattering asymmetry data on the fragmentation functions, where the produced hadrons of different electric charge are identified. We break symmetry assumption between quark and anti-quark fragmentation functions for favored partons by using the asymmetry data. The results of our analysis are in good agreement with electron-positron annihilation data and also with all the semi-inclusive deep inelastic scattering asymmetry data. Also we apply the obtained fragmentation functions to predict the scaled-energy distribution of $π^+/K^+$ inclusively produced in top-quark decays at next-to-leading order using the zero-mass variable-flavor-number scheme exploiting the universality and scaling violations of fragmentation functions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑