Hyperfine splitting effects in string hadronization Christian Bierlich, Smita Chakraborty, Gösta Gustafson and Leif Lönnblad Eur. Phys. J. C, 82 3 (2022) 228 Published online: 15 March 2022 DOI: 10.1140/epjc/s10052-022-10172-9