Measurement of the longitudinal spin transfer to $Lambda$ and bar$$$

Alekseev, M. and Alexakhin, V.~Y. and Alexandrov, Y. and Alexeev, G.~D. and Amoroso, A. and Austregesilo, A. and Badelek, B. and Balestra, F. and Ball

Keywords

Baryon production, Fragmentation into hadrons, Polarization in interactions and scattering, Hyperons

Abstract

The longitudinal polarisation transfer from muons to lambda and anti-lambda hyperons, D_LL, has been studied in deep inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to lambda and anti-lambda produced in the current fragmentation region exhibit different behaviours as a function of x and xF . The measured x and xF dependences of D^lambda_LL are compatible with zero, while D^anti-lambda_LL tends to increase with xF, reaching values of 0.4 - 0.5. The resulting average values are D^lambda_LL = -0.012 _s16- 0.047 _s16- 0.024 and D^anti-lambda_LL = 0.249 _s16- 0.056 _s16- 0.049. These results are discussed in the frame of recent model calculations.

Measurement of the longitudinal spin transfer to $Lambda$ and bar$$$

Keywords

Abstract

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