Light cone distribution amplitude for the Λ baryon from lattice QCD
Year: 2025
Type: article
Abstract: We calculate the leading-twist light cone distribution amplitudes of the Λ ( u d s ) baryon using lattice QCD methods within the framework of large-momentum effective theory. Our numerical computations are carried out with N f = 2 + 1 stout smeared clover fermions and a Symanzik gauge action on a lattice with spacing a = 0.077 fm and a pion mass of 303 MeV. To approach the large-momentum region, we simulate the equal-time correlations with the hadron momentum P z = { 2.52 , 3.02 , 3.52 } GeV . We investigate the analytic properties of the baryon quasidistribution amplitude in coordinate space and validate them through our lattice calculations. After renormalization and extrapolation, we present results for the three-dimensional distribution in momentum fractions of the two light quarks. Based on these findings, we briefly discuss the phenomenological impact on weak decays of Λ b and outline potential systematic uncertainties that can be improved in the future. This work lays the theoretical foundation for accessing baryon light cone distribution amplitudes from lattice QCD.
Institutions: Shanghai Jiao Tong University, Shanghai Key Laboratory for Particle Physics and Cosmology, Adam Mickiewicz University in Poznań, Chinese Academy of Sciences, Institute of High Energy Physics, University of Chinese Academy of Sciences, South China Normal University, University of Maryland, College Park, University of Regensburg, Institute of Modern Physics, Central South University, International Centre for Theoretical Physics Asia-Pacific, Institute of Theoretical Physics, Chinese University of Hong Kong, Chinese University of Hong Kong, Shenzhen, Beihang University
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4407770054