Rare decay modes of K*(1420) and K*(892)

A 2.5 standard deviation signal is observed for the decay K*-(1420) → K*-(892)π+π-. From this signal a partial width of 13.0 ± 5.0 MeV for the decay mode K*(1420)→K*(892)ππ is deduced under the assumption that the ππ system is in an I = 1 state. For the rare decay mode K*(892)→Kππ no signal is observed. The following upper limits can be given for the decay widths: ΓK*-(892) → K-π+π- < 40 keV, ΓK*-(892) → K0π-π0 < 35 keV, ΓK*0(892) → K0π+π- < 35 keV. © 1978

Measurement of hadronic shower punchthrough in magnetic field

The total punchthrough probability of showers produced by negative pions, positive pions, positive kaons and protons, has been measured as a function of depth in an absorber in a magnetic field ranging from 0 to 3 Tesla. The incident particle momentum varied from 10 to 300 GeV/c. The lateral shower development and particle multiplicity at several absorber depths have been determined. The measurements are compared with the predictions of Monte Carlo simulation programs

Measurement of momentum and angular distribution of punchthrough muons at the RD5 experiment

The momentum and angular distributions of punchthrough muons have been measured after a 10 lambda calorimeter using an iron toroid magnet with 1.5 T as spectrometer-The calorimeter was inside a variable magnetic field of 0 to 3 T. The incident momentum of the pi(-) beam ranged from 20 to 300 GeV/c. Measurements were also done at some beam momenta for pi(+) K+ and p. The results are compared with Monte Carlo predictions. A parameterization for the momentum spectrum of punchthrough muons was derived from the data

ELECTROMAGNETIC SECONDARIES IN THE DETECTION OF HIGH-ENERGY MUONS

The experiments at the planned 14 TeV proton-proton collider LHC will need a good identification and measurement of muons with energies of up to about 800 GeV. The production of electromagnetic secondaries by muons of energy from 10 to 300 GeV has been measured at the RD5 experiment at CERN using various detector types proposed for LHC experiments. It is demonstrated that the detectors can recognize the presence of individual hits from em secondaries, and that the muon measurement would be seriously compromised if these hits are not suppressed