Abstract
We develop a hybrid scheme to renormalize quasi distribution amplitudes of a light baryon on the lattice, which combines the self-renormalization and ratio scheme. By employing self-renormalization, the UV divergences and linear divergence at large spatial separations in quasi distribution amplitudes are removed without introducing extra nonperturbative effects, while making a ratio with respect to the zero-momentum matrix element can properly remove the UV divergences in small spatial separations. As a specific application, distribution amplitudes of the Λ baryon made of uds are investigated, and the requisite equal-time correlators, which define quasi distribution amplitudes in coordinate space, are perturbatively calculated up to the next-to-leading order in strong coupling constant αs. These perturbative equal-time correlators are used to convert lattice QCD matrix elements to the continuum space during the renormalization process. Subsequently, quasi distribution amplitudes are matched onto lightcone distribution amplitudes by integrating out hard modes and the corresponding hard kernels are derived up to next-to-leading order in αs including the hybrid counterterms. These results are valuable in the lattice-based investigation of the lightcone distribution amplitudes of a light baryon from the first principles of QCD.
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Acknowledgments
We would like to thank Jun Zeng, Zhifu Deng, Minhuan Chu, Jun Hua, and Qi-An Zhang for their insightful comments and invaluable discussions. This work is supported in part by the Natural Science Foundation of China under Grants No.12125503, No. U2032102, No. 12061131006, and No. 12335003. Part of the computations in this paper was run on the Siyuan-1 cluster supported by the Center for High Performance Computing at Shanghai Jiao Tong University.
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Han, C., Su, Y., Wang, W. et al. Hybrid renormalization for quasi distribution amplitudes of a light baryon. J. High Energ. Phys. 2023, 44 (2023). https://doi.org/10.1007/JHEP12(2023)044
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DOI: https://doi.org/10.1007/JHEP12(2023)044