Parton distributions in the SMEFT from high-energy Drell-Yan tails
Parton distributions in the SMEFT from high-energy Drell-Yan tails
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DOI：
10.1007/jhep07(2021)122
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发表时间：
2021-04
影响因子：
5.4
通讯作者：
A. Greljo;Shayan Iranipour;Z. Kassabov;Maeve Madigan;James Moore;J. Rojo;M. Ubiali;C. Voisey
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作者：
A. Greljo;Shayan Iranipour;Z. Kassabov;Maeve Madigan;James Moore;J. Rojo;M. Ubiali;C. Voisey
带电流和中性流Drell-Yan过程的高能尾对大x区域的轻夸克和反夸克部分子分布函数（PDF）提供了重要的约束。与此同时，短距离的新物理效应，如标准模型有效场论（SMEFT）编码的效应，将导致相同的高能Drell-Yan尾巴的平滑扭曲。在这项工作中，我们第一次评估PDF和EFT效应之间的相互作用，在大型强子对撞机的高质量的Drell-Yan过程和量化的影响，一致的联合确定PDF和威尔逊系数上的边界推导出后者。我们考虑了两种新的物理方案：1）电弱斜修正（）和2）可能与R（K（*））中LHCb异常相关的四费米子相互作用。我们占可用的Drell-Yan数据，无论是从展开的横截面和搜索，并进行专门的投影高亮度LHC。我们的主要发现是，虽然PDF和EFT效应之间的相互作用对于当前数据集仍然是温和的，但它将成为HL-LHC EFT分析的重大挑战。
The high-energy tails of charged-and neutral-current Drell-Yan processes provide important constraints on the light quark and anti-quark parton distribution functions (PDFs) in the large-x region. At the same time, short-distance new physics effects such as those encoded by the Standard Model Effective Field Theory (SMEFT) would induce smooth distortions to the same high-energy Drell-Yan tails. In this work, we assess for the first time the interplay between PDFs and EFT effects for high-mass Drell-Yan processes at the LHC and quantify the impact that the consistent joint determination of PDFs and Wilson coefficients has on the bounds derived for the latter. We consider two well-motivated new physics scenarios: 1) electroweak oblique corrections () and 2) four-fermion interactions potentially related to the LHCb anomalies in R (K (*)). We account for available Drell-Yan data, both from unfolded cross sections and from searches, and carry out dedicated projections for the High-Luminosity LHC. Our main finding is that, while the interplay between PDFs and EFT effects remains moderate for the current dataset, it will become a significant challenge for EFT analyses at the HL-LHC.