The European hybrid spectrometer

Aguilar Benitez, M.; Allison, W. W. M.; de Angelis, A.; Atkinsson, M.; Bailly, J. L.; Bartl, W.; Begalli, M.; Bettini, A.; Bizzarri, R.; Brooks, C.; Brun, R.; Canale, V.; Dicapua, E.; Caso, Carlo; Castelli, E.; Checcia, P.; Colino, N.; Colwill, S. J.; Contri, Roberto; Crennell, D.; Defoix, C.; Diez Hedo, F.; Dolbeau, J.; Duboc, J.; Dumarchez, J.; Duran, I.; Epp, B.; Eriksson, M.; Falciano, S.; Fernandez, C.; Fisher, C.; Fisjak, Y. V.; Fontanelli, Flavio; Gasparini, U.; Gurtu, A.; Gensch, U.; Gentile, S.; Gibaut, D. B.; Haupt, L.; Hellman, S.; Hernandez, J. J.; Herquet, Ph; Herve, A.; Holmgren, S. O.; Hrubec, J.; Hughes, P.; Huss, D.; Iori, M.; Ivanyushenkov, Y. M.; Jegham, E.; Johansson, K. E.; Josa, M. I.; Kesteman, J.; Kholodenko, A. G.; Kistenev, E. P. S.; Knauss, D.; Ladron de Guevara, P.; Leutz, H.; Macdermott, M.; Mazzucato, M.; Michalon, A.; Michalon Mentzer, M. E.; Minaev, N. G.; Moa, T.; Monge, MARIA ROBERTA; Montanet, L.; Naumann, T.; Neuhofer, G.; Nilsson, S.; Nowak, H.; Otter, G.; Ouared, R.; Panella, J.; Pernicka, M.; Pingot, O.; Piredda, G.; Sudhakar, K.; Polyakov, B. F.; Poppleton, A.; Poropat, P.; Powell, B.; Reucroft, S.; Rohringer, H.; Roth, A.; Salicio, J.; Schmidmeyer, J.; Schulte, R.; Sellden, B.; Sessa, M.; Shields, P. D.; Squarcia, Sandro; Starchenko, E. A.; Strusczinski, W.; Touboul, M. C.; Trevisan, Umberto; Troncon, C.; Ventura, L.; Vilain, P.; Vlasov, E. V.; Voltolini, C.; Vonck, B.; Wright, P. R. S.; Zumerle, G.

doi:10.1016/0168-9002(87)90077-5

The final version of the European hybrid spectrometer (EHS) is described. EHS was used in the NA27 experiment to study charm particles produced in View the MathML source interactions. A rapid cycling, high resolution bubble chamber (LEBC) produced bubbles of 17 μm diameter which were measured with a precision of 2.5 μm. Short-lived charm particles are observed with an efficiency up to 90% (D±). The spectrometer accepts 70% of all particles produced, including approximately 100% of those in the forward hemisphere and the momenta of charged particles are measured to better than 1% over the whole momentum range. The charged particle identification detectors give information on 84% of the spectrometer tracks, half of which obtain unique identification. Two lead glass detectors measure the energy of electromagnetic showers such that the π0 mass distribution has a fwhm of View the MathML source. Hadronic showers are measured with two iron/scintillator calorimeters. The mass resolutions are 3.0, 0.9 and 11 View the MathML source for K0, Λ0 and D− charged particles respectively. The D0 mass is measured to be (1865.1 ± 1.8 ± 0.8)