تقرير
Off-lightcone Wilson-line operators in gradient flow
| العنوان: | Off-lightcone Wilson-line operators in gradient flow |
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| المؤلفون: | Brambilla, Nora, Wang, Xiang-Peng |
| المصدر: | JHEP 06 (2024) 210 |
| سنة النشر: | 2023 |
| المجموعة: | High Energy Physics - Lattice High Energy Physics - Phenomenology Nuclear Theory |
| مصطلحات موضوعية: | High Energy Physics - Phenomenology, High Energy Physics - Lattice, Nuclear Theory |
| الوصف: | Off-lightcone Wilson-line operators are constructed using local operators connected by time-like or space-like Wilson lines, which ensure gauge invariance. Off-lightcone Wilson-line operators have broad applications in various contexts. For instance, space-like Wilson-line operators play a crucial role in determining quasi-distribution functions (quasi-PDFs), while time-like Wilson-line operators are essential for understanding quarkonium decay and production within the potential non-relativistic QCD (pNRQCD) framework. In this work, we establish a systematic approach for calculating the matching from the gradient-flow scheme to the $\overline{\rm MS}$ scheme in the limit of small flow time for off-lightcone Wilson-line operators. By employing the one-dimensional auxiliary-field formalism, we simplify the matching procedure, reducing it to the matching of local current operators. We provide one-loop level matching coefficients for these local current operators. For the case of hadronic matrix element related to the quark quasi-PDFs, we show at one-loop level that the finite flow time effect is very small as long as the flow radius is smaller than the physical distance $z$, which is usually satisfied in lattice gradient flow computations. Applications include lattice gradient flow computations of quark/gluon quasi-PDFs, gluonic correlators related to quarkonium decay and production in pNRQCD, and spin-dependent potentials in terms of chromoelectric and chromomagnetic field insertions into a Wilson loop. Comment: Published version, including updating footnote 5 and Note Added for comparison with existing calculation, and correcting several text typos |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1007/JHEP06(2024)210 |
| URL الوصول: | http://arxiv.org/abs/2312.05032 |
| رقم الأكسشن: | edsarx.2312.05032 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1007/JHEP06(2024)210 |
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