Physical Review D: Particles, Fields, Gravitation and Cosmology
114512 (18 pp.)
We present a calculation of the pion valence quark distribution extracted using the formalism of reduced Ioffe-time pseudodistributions or more commonly known as pseudo-PDFs. Our calculation is carried out on two different 2 + 1 flavor QCD ensembles using the isotropic-clover fermion action, with lattice dimensions 243 × 64 and 323 × 96 at the lattice spacing of a = 0.127 fm, and with the quark mass equivalent to a pion mass of mπ ≃ 415 MeV. We incorporate several combinations of smeared-point and smeared-smeared pion source-sink interpolation fields in obtaining the lattice QCD matrix elements using the summation method. After one-loop perturbative matching and combining the pseudodistributions from these two ensembles, we extract the pion valence quark distribution using a phenomenological functional form motivated by the global fits of parton distribution functions. We also calculate the lowest four moments of the pion quark distribution through the “operator product expansion without operator product expansion.” We present a qualitative comparison between our lattice QCD extraction of the pion valence quark distribution with that obtained from global fits and previous lattice QCD calculations.
Original Publication Citation
Joó, B., Karpie, J., Orginos, K., Radyushkin, A. V., Richards, D. G., Sufian, R. S., & Zafeiropoulos, S. (2019). Pion valence structure from Ioffe-time parton pseudodistribution functions. Physical Review D: Particles, Fields, Gravitation and Cosmology, 100(11), 114512 doi:10.1103/PhysRevD.100.114512
Joó, Bálint; Karpie, Joseph; Orinos, Kostas; Radyushkin, Anatoly V.; Richards, David G.; Sufian, Raza Sabbir; and Zafeiropoulos, Savvas, "Pion Valence Structure from Ioffe-Time Parton Pseudodistribution Functions" (2019). Physics Faculty Publications. 415.