arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 0808.1003hep-ex
收藏

HERA深非弹性散射中粲碎裂成D^{* \pm }介子的研究

Study of Charm Fragmentation into D^{*\pm} Mesons in Deep-Inelastic Scattering at HERA

H1 Collaboration

摘要:

利用HERA H1探测器测量的深度非弹性散射中的$D^{*\pm}$介子产生研究了粲夸克碎裂过程。两个不同的相空间区域的调查定义的存在或不存在的喷流含有$D^{*\pm}$介子的事件。基于QCD模型的首阶矩阵元和部分子的DGFM或CCFM演化以及弦碎裂和粒子衰变,提取了碎裂函数的参数。此外,它们被确定为次主导阶QCD计算中的固定味数计划使用的独立碎裂的魅力夸克$D^{*\pm}$介子。

英文摘要:

The process of charm quark fragmentation is studied using $D^{*\pm}$ meson production in deep-inelastic scattering as measured by the H1 detector at HERA. Two different regions of phase space are investigated defined by the presence or absence of a jet containing the $D^{*\pm}$ meson in the event. The parameters of fragmentation functions are extracted for QCD models based on leading order matrix elements and DGLAP or CCFM evolution of partons together with string fragmentation and particle decays. Additionally, they are determined for a next-to-leading order QCD calculation in the fixed flavour number scheme using the independent fragmentation of charm quarks to $D^{*\pm}$ mesons.

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。

↑