THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS
Abstract
The longitudinal polarisation transfer from muons to Λ and bar(Λ) hyperons, D^Λ(barΛ)_LL , has been studied in deep-inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to
Λ and barΛ produced in the current fragmentation region exhibit different behaviours as a function of x and xF. The
measured x and xF dependences of DΛ_LL are compatible with zero, while DbarΛ_LL tends to increase with xF , reaching
values of 0.4–0.5. The resulting average values are DΛ_LL =−0.012±0.047±0.024 and DbarΛ_LL = 0.249±0.056±0.049.
These results are discussed in the frame of recent model calculations.
