Journal Article

Measurement of the longitudinal spin transfer to and $\\bar{\\varLambda}$ hyperons in polarised muon DIS

Liska, T, Kraemer, M, Sinha, L, Kolosov, V N, Alekseev, M, Heinsius, F H, Ramos, S, Zhuravlev, N, Pesaro, G, Herrmann, F, Brona, G, Iven, B, Mikhailov, YuV, Chapiro, A, Ketzer, B, Zhao, J, Dinkelbach, A M, Barth, J, Stolarski, M, Heckmann, J, Nagaytsev, A, Denisov, OYu, Kouznetsov, O, Reggiani, D, Shevchenko, OYu, Venugopal, G, Wislicki, W, Kuhn, R, Quintans, C, Schmitt, L, Rajotte, J-F, Hermann, M, Levorato, S, Moinester, MA, Hermann, R, Hess, C, Le Goff, JM, Grasso, A, Donskov, S V, Komissarov, E V, Jahn, R, Maximov, AN, Ivanshin, Yu, Lichtenstadt, J, Klimaszewski, K, Kang, D, Bressan, A, Dasgupta, S S, Neubert, S, Ferrero, A, Sapozhnikov, M G, Alexandrov, Yu, Eyrich, W, Nikolaenko, VI, Ivanov, O, Kowalik, K, Chung, SU, Bussa, M P, Grube, B, Negrini, S, Hoeppner, Ch, Tessaro, S, Panzieri, D, Dafni, T, Badelek, B, Konopka, R, Marroncle, J, Harrach, Dvon, Iwata, T, Silva, L, Amoroso, A, Garfagnini, R, Kunne, F, Peshekhonov, D V, Gerassimov, S, Zemlyanichkina, E, Balestra, F, Mutter, A, Fischer, H, Jegou, G, Bisplinghoff, J, Sbrizzai, G, Sissakian, AN, Ilgner, C, Kotzinian, A M, Sandacz, A, Hinterberger, F, Zaremba, K, Koblitz, S, Bradamante, F, Guskov, A, Polak, J

2009

Overview

The longitudinal polarisation transfer from muons to and $\\bar{\\varLambda}$ hyperons, $D_{\\varLambda(\\bar{\\varLambda})}$ , has been studied in deep-inelastic scattering off an unpolarised isoscalar target at the COMPASS experiment at CERN. The spin transfers to and $\\bar{\\varLambda}$ produced in the current fragmentation region exhibit different behaviours as a function of x and x sub(F ). The measured x and x sub(F )dependences of D sub(LL ) super( )are compatible with zero, while $D_{\\bar{\\varLambda}}$ tends to increase with x sub(F ), reaching values of 0.4-0.5. The resulting average values are D sub(LL ) super( )= -0.012c0.047c0.024 and $D_{\\bar{\\varLambda}}$ = 0.249c0.056c0.049. These results are discussed in the frame of recent model calculations.

• Subject: CERN / Compatibility / Frames / Hyperons / Magnetic properties / Mathematical models / Muons / Particle spin