1. IE browser is NOT supported anymore. Please use Chrome, Firefox or Edge instead.
2. If you are a new user, please register to get an IHEP SSO account through https://login.ihep.ac.cn/registlight.jsp Any questions, please email us at helpdesk@ihep.ac.cn or call 88236855.
3. If you need to create a conference in the "Conferences, Workshops and Events" zone, please email us at helpdesk@ihep.ac.cn.
4. The max file size allowed for upload is 100 Mb.
22–26 Sep 2025
Asia/Shanghai timezone

High-Precision Determination of Quark Spin in Lattice QCD: A Novel Method

Not scheduled
3h 30m
Oral Three-dimensional structure of the nucleon: generalized parton distributions and form factors Parallel

Speaker

志成 胡 (Chinese Academy of Sciences Institute of Modern Physics)

Description

We propose a ``blending" algorithm that projects the all-to-all fermion propagator onto spatial low-frequency modes (LFM) combined with a stochastic estimate of spatial high-frequency modes (SHFM) at each time slice.
This approach enables the calculation of arbitrary-point correlation functions for arbitrary hadron states in strongly interacting quantum field theories (QFT) with fermions, such as quantum chromodynamics (QCD).
Specifically, LFM allows the construction of spatially extended hadron states below a certain energy threshold by diagonalizing multi-fermion interpolation fields. Meanwhile, the local interactions required for N-point correlation functions in QFT can be approximated in an unbiased manner through a reweighted summation of both LFM and SHFM contributions.
To demonstrate the efficiency of this algorithm, we obtained {\color{black} $g_A^u=0.895(15)$, $g_A^d=-0.338(15)$, $g_A^s=-0.0245(72)$, $g_A^{u+d+s}=0.533(28)$ and $g_A^{u-d}=1.2339(43)$ } for nucleon at $m_{\pi}=300$ MeV and $a=0.077$ fm using 40 configurations.
The consistency check of the pion electric form factor and charge radius derived from 3-point and 4-point correlation functions is also provided.

Primary author

志成 胡 (Chinese Academy of Sciences Institute of Modern Physics)

Co-authors

Presentation materials

There are no materials yet.