The LHCb experiment is dedicated to precision measurements of CP violation and rare decays of B hadrons at the Large Hadron Collider (LHC) at CERN (Geneva). The initial configuration and expected performance of the detector and associated systems, as established by test beam measurements and simulation studies, is described.

Proton-antiproton elastic scattering at CM energy 540 GeV has been studied in the t-range 0.04 < -t < 0.45 GeV2. The data are well fitted by the form exp (bt) with b = 17.1 ± 1.0 GeV-2 for |t| = 0.04 - 0.18 GeVsu2 and b = 13.7 ± 0.2 ± 0.2 GeV-2 for |t| = 0.21-0.45 GeV2. A luminosity measurement combined with the optical theorem gives σtot = 67.6 ± 5.9 ± 2.7 mb and σe1/σtot = 0.209 ± 0.018 ± 0.008. © 1983

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Earlier measurements of the differential cross section for ~z + photoproduction on hydrogen at forward angles have been extended up to 180 ~ The pions were analysed in angle and momentum by a magnetic spectrometer. Angular distributions have been measured at 16 energies between 220 and 425 MeV. Most of them cover the region between 15 ~ and 180 ~ in steps of 5 degree with a statistical error of about 3 %. Moravcsik equivalent fits give a very good representation of the data.