تقرير
Lattice QCD calculation of the pion distribution amplitude with domain wall fermions at physical pion mass
| العنوان: | Lattice QCD calculation of the pion distribution amplitude with domain wall fermions at physical pion mass |
|---|---|
| المؤلفون: | Baker, Ethan, Bollweg, Dennis, Boyle, Peter, Cloët, Ian, Gao, Xiang, Mukherjee, Swagato, Petreczky, Peter, Zhang, Rui, Zhao, Yong |
| المصدر: | JHEP07(2024)211 |
| سنة النشر: | 2024 |
| المجموعة: | High Energy Physics - Lattice |
| مصطلحات موضوعية: | High Energy Physics - Lattice |
| الوصف: | We present a direct lattice QCD calculation of the $x$-dependence of the pion distribution amplitude (DA), which is performed using the quasi-DA in large momentum effective theory on a domain-wall fermion ensemble at physical quark masses and spacing $a\approx 0.084$ fm. The bare quais-DA matrix elements are renormalized in the hybrid scheme and matched to $\overline{\rm MS}$ with a subtraction of the leading renormalon in the Wilson-line mass. For the first time, we include threshold resummation in the perturbative matching onto the light-cone DA, which resums the large logarithms in the soft gluon limit at next-to-next-to-leading log. The resummed results show controlled scale-variation uncertainty within the range of momentum fraction $x\in[0.25,0.75]$ at the largest pion momentum $P_z\approx 1.85$~GeV. In addition, we apply the same analysis to quasi-DAs from a highly-improved-staggered-quark ensemble at physical pion mass and $a=0.076$ fm. By comparison we find with $2\sigma$ confidence level that the DA obtained from chiral fermions is flatter and lower near $x=0.5$. Comment: update to match the version published in journal |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1007/JHEP07(2024)211 |
| URL الوصول: | http://arxiv.org/abs/2405.20120 |
| رقم الأكسشن: | edsarx.2405.20120 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1007/JHEP07(2024)211 |
|---|