Measurement of the SMC muon beam polarisation using the asymmetry in the elastic scattering off polarised electrons

A muon beam polarimeter was built for the SMC experiment at the CERN SPS, for beam energies of 100 and 190 GeV. The beam polarisation is determined from the asymmetry in the elastic scattering off the polarised electrons of a ferromagnetic target whose magnetisation is periodically reversed. At muon...

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Veröffentlicht in:	Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2000-03, Vol.443 (1), p.1-19
Hauptverfasser:	Adams, D., Arik, E., Badelek, B, Bardin, G., Berglund, P., Betev, L., Birsa, R., Bonner, B.E., de Botton, N., Boutemeur, M., Bradamante, F., Bressan, A., Bültmann, S., Burtin, E., Cavata, C., Clocchiatti, M., Crabb, D., Cranshaw, J., Çuhadar, T., Dalla Torre, S., van Dantzig, R., Deshpande, A., Dulya, C., Fasching, D., Fernandez, C., Forthmann, S., Gallas, A., Garzon, J.A., Gatignon, L., Giorgi, M., von Goeler, E., Gracia, G., de Groot, N., Grosse Perdekamp, M., von Harrach, D., Hautle, P., Igo, G., Iwata, T., Kessler, H.J., Ketel, T.J., Kiryluk, J., Kishi, A., Kisselev, Yu, Klostermann, L., Krämer, D., Kröger, W., Kukhtin, V., Kyynäräinen, J., Lamanna, M., Landgraf, U., Lehar, F., de Lesquen, A., Lichtenstadt, J., Lindqvist, T., Litmaath, M., Mallot, G.K., Marie, F., Martin, A., van Middelkoop, G., Miller, D., Miyachi, Y., Moromisato, J., Nagaitsev, A., Naumann, L., Oberski, J.E.J., Ozben, C., Peshekhonov, D., Postma, H., Pussieux, T., Reicherz, G., Roberts, J.B., Rodriguez, M., Rondio, E., Ropelewski, L., Sabo, I., Saborido, J., Savin, I., Schiller, A., Schüler, K.P., Semertzidis, Y., Sichtermann, E.P., Simeoni, F., Smirnov, G.I., Staude, A., Steinmetz, A., Stiegler, U., Stuhrmann, H., Szleper, M., Tessarotto, F., Thers, D., Tripet, A., Unel, G., Velasco, M., Whitten, C., Windmolders, R., Willumeit, R., Wislicki, W., Zanetti, A.M., Zaremba, K., Zhao, J.
Format:	Artikel
Sprache:	eng
Schlagworte:	Magnetised target Muon beam Polarisation measurement Polarised electron Polarised muon Polarised scattering
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Beschreibung
Zusammenfassung:	A muon beam polarimeter was built for the SMC experiment at the CERN SPS, for beam energies of 100 and 190 GeV. The beam polarisation is determined from the asymmetry in the elastic scattering off the polarised electrons of a ferromagnetic target whose magnetisation is periodically reversed. At muon energies of 100 and 190 GeV the measured polarisation is P μ =−0.80±0.03 (stat.)±0.02 (syst.) and P μ =−0.797±0.011 (stat.)±0.012 (syst.), respectively. These results agree with measurements of the beam polarisation using a shape analysis of the decay positron energy spectrum.
ISSN:	0168-9002 1872-9576
DOI:	10.1016/S0168-9002(99)01017-7