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arXiv 1003.1084hep-ph
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E^+E^-K介子产生的非单态K介子碎裂函数

The non-singlet kaon fragmentation function from e^+e^- kaon production

S. Albino, E. Christova

摘要:

我们进行了适合的$e^++e^-\to K+X$,$K=K^\pm and K^0_S$中可用的带电和中性K介子生产数据,并确定非单态组合的K介子碎裂函数$D_u^{K^\pm}-D_d^{K^\pm}$在一个模型独立的方式,没有任何相关性的其他碎裂功能。只假定核的同位旋不变性。使用非单重态使我们能够包括在非常低的动量分数下的数据,到目前为止,这些数据在全局拟合中被排除在外,并首次对碎裂函数进行NNLO拟合。我们发现,在大$z$的K介子非单重碎裂函数是大于其他合作从全球拟合分析,并在低$z$显着不同。

英文摘要:

We perform fits to the available charged and neutral kaon production data in $e^++e^-\to K+X$, $K=K^\pm and K^0_S$, and determine the non-singlet combination of kaon fragmentation functions $D_u^{K^\pm}-D_d^{K^\pm}$ in a model independent way and without any correlations to the other fragmentation functions. Only nuclear isospin invariance is assumed. Working with non-singlets allows us to include the data at very low momentum fractions, which have so far been excluded in global fits, and to perform a first NNLO fit to fragmentation functions. We find that the kaon non-singlet fragmentation function at large $z$ is larger than that obtained by the other collaborations from global fit analysis and differs significantly at low $z$.

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。

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