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

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

COMPASS

Collaboration

2009

13 pages

Published in:

Eur.Phys.J.C 64 (2009) 171-179

e-Print:

0907.0388 [hep-ex]

DOI:

10.1140/epjc/s10052-009-1143-7

Report number:

CERN-PH-EP-2009-011

Experiments:

CERN-SPS-NA58

View in:

reference search60 citations

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Abstract: (arXiv)

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 +- 0.047 +- 0.024 and D^anti-lambda_LL = 0.249 +- 0.056 +- 0.049. These results are discussed in the frame of recent model calculations.

Note:

13 pages, 7 figures

13.88.+e
13.87.Fh
13.60.Rj
14.20.Jn
lepton deep inelastic scattering
strange particles
polarisation
spin transfer
hyperons
muon+ nucleus: deep inelastic scattering

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Figures(0)

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