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Sep 24 – 29, 2023
US/Eastern timezone

First lattice QCD exploration of chiral-even axial twist-3 GPDs of the proton

Sep 27, 2023, 11:00 AM
18m
Meeting Room 3-4 (Durham Convention Center)

Meeting Room 3-4

Durham Convention Center

Talk 3D Structure of the Nucleon: GPDs and Form Factors 3D Structure of the Nucleon: GPDs and Form Factors

Speaker

Krzysztof Cichy (Adam Mickiewicz University)

Description

We present the first calculation of twist-3 axial quark GPDs of the proton using lattice QCD combined with the large momentum effective theory (LaMET) approach. We use one ensemble of twisted mass fermions with degenerate light quarks, a strange and a charm quark, at a single lattice spacing of 0.093 fm and a pion mass of 260 MeV. We employ three proton boosts up to 1.67 GeV to test the convergence of the LaMET expansion. The light-cone twist-3 GPDs are defined in the symmetric frame, at negative momentum transfers squared of 0.69, 1.38 and 2.76 GeV^2 and at zero skewness. We extract the leading combinations of twist-3 axial GPDs and twist-2 helicity GPDs and we isolate some of the twist-3 ones, confirming that one of them vanishes at zero skewness. We also perform several consistency checks, such as the local limit of the extracted GPDs and the Burkhardt-Cottingham-type and Efremov-Teryaev-Leader-type sum rules.

Primary authors

Shohini Bhattacharya (BNL) Krzysztof Cichy (Adam Mickiewicz University) Martha Constantinou (Temple University) Jack Dodson (Temple University) Andreas Metz (Physics Department, Temple University, Philadelphia) Aurora Scapellato Fernanda Steffens (University of Bonn)

Presentation materials