The longitudinal polarisation transfer from muons to Λ and Λ¯ hyperons, DΛ(Λ¯)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 Λ¯ produced in the current fragmentation region exhibit different behaviours as a function of x and x F . The measured x and x F dependences of D LL Λ are compatible with zero, while DΛ¯LL tends to increase with x F , reaching values of 0.4–0.5. The resulting average values are D LL Λ = −0.012±0.047±0.024 and DΛ¯LL = 0.249±0.056±0.049. These results are discussed in the frame of recent model calculations.
Measurement of the longitudinal spin transfer to Lambda and (Lambda)over-bar hyperons in polarised muon DIS RID D-4627-2011
PANZIERI, Daniele;
2009-01-01
Abstract
The longitudinal polarisation transfer from muons to Λ and Λ¯ hyperons, DΛ(Λ¯)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 Λ¯ produced in the current fragmentation region exhibit different behaviours as a function of x and x F . The measured x and x F dependences of D LL Λ are compatible with zero, while DΛ¯LL tends to increase with x F , reaching values of 0.4–0.5. The resulting average values are D LL Λ = −0.012±0.047±0.024 and DΛ¯LL = 0.249±0.056±0.049. These results are discussed in the frame of recent model calculations.File in questo prodotto:
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