Constraining the top-quark mass within the global MSHT PDF fit
Constraining the top-quark mass within the global MSHT PDF fit
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DOI：
10.1140/epjc/s10052-023-11961-6
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发表时间：
2023-06
期刊：
影响因子：
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通讯作者：
T. Cridge;M. Lim
中科院分区：
文献类型：
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作者：
T. Cridge;M. Lim
我们研究了顶夸克对生产的实验测量的能力，以约束顶夸克质量和强耦合内的全球MSHT部分子分布函数（PDF）的拟合。具体而言，我们考虑ATLAS和CMS测量的差分分布在一个中心的质量能量为8 TeV，以及astotal横截面数据在各种实验，并比较理论预测，包括下一个到下一个到领先的顺序校正。我们发现，补充全球适合与此额外的信息的结果在相对较强的限制顶夸克质量，也能够约束强耦合在有限的方式。我们的最终结果是，是兼容的世界平均极点质量提取的横截面测量的粒子数据组。我们还研究了不同的顶夸克质量对胶子部分子分布函数的影响，发现在highx的变化，但在该地区的大PDF的不确定性。
We examine the ability of experimental measurements of top-quark pair production to constrain both the top-quark mass and the strong coupling within the global MSHT parton distribution function (PDF) fit. Specifically, we consider ATLAS and CMS measurements of differential distributions taken at a centre-of-mass energy of 8 TeV, as well astotal cross section data taken at a variety of experiments, and compare to theoretical predictions including next-to-next-to-leading order corrections. We find that supplementing the global fit with this additional information results in relatively strong constraints on the top-quark mass, and is also able to bound the strong coupling in a limited fashion. Our final result isand is compatible with the world average pole mass extracted from cross section measurements ofby the Particle Data Group. We also study the effect of different top-quark masses on the gluon parton distribution function, finding changes at highxwhich nonetheless lie within the large PDF uncertainties in this region.