Abstract
Recasting phenomenological Lagrangians in terms of SM effective field theory (SMEFT) provides a valuable means of connecting potential BSM physics at momenta well above the electroweak scale to experimental signatures at lower energies. In this work we jointly fit the Wilson coefficients of SMEFT operators as well as the PDFs in an extension of the CT18 global analysis framework, obtaining self-consistent constraints to possible BSM physics effects. Global fits are boosted with machine-learning techniques in the form of neural networks to ensure efficient scans of the full PDF+SMEFT parameter space. We focus on several operators relevant for top-quark pair and jet production at hadron colliders and obtain constraints on the Wilson coefficients with Lagrange Multiplier scans. We find mild correlations between the extracted Wilson coefficients, PDFs, and other QCD parameters, and see indications that these correlations may become more prominent in future analyses based on data of higher precision. This work serves as a new platform for joint analyses of SM and BSM physics based on the CTEQ-TEA framework.
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Acknowledgments
This work was sponsored by the National Natural Science Foundation of China under the Grant No.12275173 and No.11835005. We would like to thank Marco Guzzi, Keping Xie and other members of CTEQ-TEA collaboration for helpful discussions and proofreading of the manuscript, and Katerina Lipka and Klaus Rabbertz for useful communications. JG thanks the sponsorship from Yangyang Development Fund. The work of TJH at Argonne National Laboratory was supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02-06CH11357.
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Gao, J., Gao, M., Hobbs, T.J. et al. Simultaneous CTEQ-TEA extraction of PDFs and SMEFT parameters from jet and \( t\overline{t} \) data. J. High Energ. Phys. 2023, 3 (2023). https://doi.org/10.1007/JHEP05(2023)003
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DOI: https://doi.org/10.1007/JHEP05(2023)003