https://doi.org/10.1140/epjc/s10052-022-10562-z
Regular Article - Theoretical Physics
The
azimuthal asymmetry of pion production in SIDIS within TMD factorization
1
School of Physics, Southeast University, 211189, Nanjing, China
2
School of Physics and Information Engineering, Shanxi Normal University, 030031, Taiyuan, China
Received:
12
January
2022
Accepted:
1
July
2022
Published online:
3
August
2022
We study the azimuthal asymmetry of charged and neutral pion productions off the longitudinally polarized nucleon targets in semi-inclusive deeply inelastic scattering (SIDIS) process within the transverse momentum dependent (TMD) factorization. The asymmetry is contributed by the convolution of the TMD distribution
and the Collins fragmentation function
. We adopt the Wandzura–Wilczek-type (WW-type) approximation for
and two different parametrizations on the nonperturbative Sudakov form factor for
and
. We estimate the
asymmetry at HERMES and CLAS and compare them with the corresponding experimental data. We also provide the prediction at kinematical configuration of CLAS12. It is shown that our theoretical calculation can describe the HERMES and CLAS data, except the asymmetry of the
production off proton target at HERMES and CLAS. We also find that different choices of the nonperturbative part of TMD evolution lead qualitatively similar results.
© The Author(s) 2022
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