Longitudinal spin transfer to theΛhyperon in semiinclusive deep-inelastic scattering

Parton fragmentation functions

“…Since several models predicted that the polarization of the Λ is largely associated with a polarized strange quark, one expected in the SIDIS process p → ΛX, in which G Λ/q 1 (z) enters [568,569], a strong sensitivity to the strange quark helicity distribution in the proton. The FF G Λ/q 1 (z) also shows up in p → ΛX, a process which was measured by the E665 Collaboration [570], the HERMES Collaboration [571,572], and the COMPASS Collaboration [573]. However, so far there is no data available for p → ΛX.…”

Improved measurement of the longitudinal spin transfer to Λ and Λ¯ hyperons in polarized proton-proton collisions at Adam1, Adamczyk2, Adams3 et al. 2018Phys. Rev. DSelf Cite

“…Sizable longitudinal Λ +Λ polarization effects have been observed in e + + e − annihilation at an energy corresponding to the Z 0 pole [3,4], originating mostly from fragmentation of the strongly polarized strange quarks and anti-quarks from Z 0 decay [5][6][7]. The spin transfer to the struck quarks is expected to play an important role in semi-inclusive deep-inelastic scattering spin-transfer measurements of longitudinally polarized positron and muon beams off unpolarized targets [8][9][10], while neutrino measurements [11,12] are sensitive to fragments of the target remnant.…”

Polarized hyperon production in single-inclusive electron-positron annihilation at next-to-leading order

“…Here, polarized Λ's may be produced in ep → eΛX or in the equivalent quasi-real photo-production processes. Experimental studies of these reactions have been performed by the HERMES Collaboration [11][12][13], as well as in neutrino-nucleon scattering by the NOMAD Collaboration [14,15].…”