arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1809.02508hep-ph
收藏

胶子和夸克喷注多重性演化中分裂函数的类超对称关系

SUSY-like relation of the splitting functions in evolution of gluon and quark jet multiplicities

Anatoly Kotikov

摘要:

我们给出了Dokshitzer-Gribov-Lipatov-Altarelli-Parisi(DGSTZ)演化方程中夸克和胶子碎裂函数的第一Mellin矩D_{q,g}(μ 2)的反常维数之间的新关系[1],这些反常维数通过次-首对数阶表示,它们分别对应于夸克和胶子引发的喷注中的平均强子多重数.到目前为止,这种关系只在超对称(SUSY)QCD中被发现。利用主导正分量的比值D_g^+(μ 2)/D_q^+(μ 2)的次领先级(NNNLO)信息,用e+e湮灭中测量的带电强子的D_{q,g}(μ 2)世界数据拟合,得到α_s^{(5)}(MZ)=0.1205 + 0.0016 - 0.0020。

英文摘要:

We show the new relationship [1] between the anomalous dimensions, resummed through next-to-next-to-leading-logarithmic order, in the Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution equations for the first Mellin moments D_{q,g}(mu2) of the quark and gluon fragmentation functions, which correspond to the average hadron multiplicities in jets initiated by quarks and gluons, respectively. So far, such relationships have only been known from supersymmetric (SUSY) QCD. Exploiting available next-to-next-to-next-to-leading-order (NNNLO) information on the ratio D_g^+(mu2)/D_q^+(mu2) of the dominant plus components, the fit of the world data of D_{q,g}(mu2) for charged hadrons measured in e+e- annihilation leads to alpha_s^{(5)}(MZ)=0.1205 + 0.0016 - 0.0020.

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。

↑