RETRACTED: Impact of charm H1-ZEUS combined data and determination of the strong coupling in two different schemes (Retracted article. See vol. 42, art no 089001, 2018)

被引：2
作者：
Vafaee, A. [1 ]
Khorramian, A. N. [1 ]
机构：
[1] Semnan Univ, Fac Phys, POB 35131-19111, Semnan, Iran
来源：
CHINESE PHYSICS C | 2017年 / 41卷 / 11期
关键词：
QCD; HERA combined; PDFs; charm; DEEP-INELASTIC SCATTERING; LUND MONTE-CARLO; CROSS-SECTION; QCD ANALYSIS; PARTON DISTRIBUTIONS; P(P)OVER-BAR COLLISIONS; JET FRAGMENTATION; EP SCATTERING; E+E-PHYSICS; GENERATOR;
D O I：
10.1088/1674-1137/41/11/113104
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
We study the impact of recent measurements of charm cross section H1-ZEUS combined data on simultaneous determination of parton distribution functions (PDFs) and the strong coupling, alpha(s)(M-Z(2)), in two different schemes. We perform several fits based on Thorne-Roberts (RT) and Thorne-Roberts optimal (RTOPT) schemes at next-to-leading order (NLO). We show that adding charm cross section H1-ZEUS combined data reduces the uncertainty of the gluon distribution and improves the fit quality up to similar to 0.4% and similar to 0.9%,without and with the charm contribution, from the RT scheme to the RTOPT scheme, respectively. We also emphasise the central role of the strong coupling, alpha(s)(M-Z(2)), in revealing the impact of charm flavour contribution, when it is considered as an extra free parameter. We show that in going from the RT scheme to the RT OPT scheme, we get similar to 0.9% and similar to 2.0% improvement in the value of alpha(s)(M-Z(2)), without and with the charm flavour contribution respectively.
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页数：11
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