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.

Measurement of the Longitudinal Spin Transfer to Lambda and Anti-Lambda Hyperons in Polarised Muon DIS

BIRSA, RENATO;BRADAMANTE, FRANCO;BRESSAN, Andrea;DALLA TORRE, SILVIA;DUIC, VENICIO;GIORGI, MARCELLO;LEVORATO, STEFANO;MARTIN, ANNA;PESARO, GIULIA;SBRIZZAI, GIULIO;SCHIAVON, PAOLO;SOZZI, FEDERICA;TAKEKAWA, STEFANO;TESSARO, SUSANNA;
2009-01-01

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.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2293674
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