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arXiv 1711.03355hep-phhep-ex
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没有重味匹配处方的重味部分子分布

Heavy-flavor parton distributions without heavy-flavor matching prescriptions

Valerio Bertone, Alexandre Glazov, Alexander Mitov, Andrew Papanastasiou, Maria Ubiali

摘要:

我们发现,众所周知的障碍与零质量可变味数计划,即省略O(1)的质量功率校正接近传统的重味匹配点(HFMP)mu_b = m,可以很容易地克服。为此,充分利用选择HFMP位置的自由。我们证明,通过选择一个足够大的HFMP(可以是重夸克质量的10倍),可以得到以下改进:1)在HFMP以上,丢失的幂修正O(m)的大小受μ b值的限制,因此,与它们的遗漏有关的误差可以忽略不计; 2)不需要对截面的定义进行额外的规定; 3)保持了重新计算的精度; 4)与通常的知识相反,我们发现α_s和PDF跨阈值的不连续性导致了对可观测量的预测的改进的连续性。我们已经考虑了大量的质子-质子和电子-质子对撞机过程,许多通过NNLO QCD,证明了我们的建议的广泛适用性。

英文摘要:

We show that the well-known obstacle for working with the zero-mass variable flavor number scheme, namely, the omission of O(1) mass power corrections close to the conventional heavy flavor matching point (HFMP) mu_b=m, can be easily overcome. For this it is sufficient to take advantage of the freedom in choosing the position of the HFMP. We demonstrate that by choosing a sufficiently large HFMP, which could be as large as 10 times the mass of the heavy quark, one can achieve the following improvements: 1) above the HFMP the size of missing power corrections O(m) is restricted by the value of mu_b and, therefore, the error associated with their omission can be made negligible; 2) additional prescriptions for the definition of cross-sections are not required; 3) the resummation accuracy is maintained and 4) contrary to the common lore we find that the discontinuity of alpha_s and pdfs across thresholds leads to improved continuity in predictions for observables. We have considered a large set of proton-proton and electron-proton collider processes, many through NNLO QCD, that demonstrate the broad applicability of our proposal.

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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