# The 39th International Symposium on Lattice Field Theory (Lattice 2022)

Aug 8 – 13, 2022
Hörsaalzentrum Poppelsdorf
Europe/Berlin timezone

## Calculation of the pion charge radius from an improved model-independent method

Aug 12, 2022, 3:30 PM
20m
CP1-HSZ/Ground-0.010 - HS2 (CP1-HSZ)

### CP1-HSZ/Ground-0.010 - HS2

#### CP1-HSZ

450
Oral Presentation Hadron Structure

### Speaker

Kohei Sato (University of Tsukuba)

### Description

We investigate an improved analysis method of the recently-proposed model-independent method to obtain the pion charge radius from the electromagnetic pion three-point function. We discuss a systematic error of the original method in small volume, and propose an improvement to reduce it. Using the $N_f = 2+1$ lattice QCD data at $m_\pi = 0.51$ GeV, we compare the result of the pion charge radius from our improved method with the ones from the original method, and also from a traditional model-dependent method.

### Primary author

Kohei Sato (University of Tsukuba)

### Co-authors

Dr Hiromasa Watanabe (KEK) Takeshi Yamazaki (University of Tsukuba)