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

Abstract

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

Measurement of hadronic shower punchthrough in magnetic field

“…We can conclude that the reduction in the punchthrough probability (see Figures 3,4,5 and 6) caused by magnetic field, observed for absorber depths greater than 10 (muon stations 1, 2 and 3), can be wholly explained by punchthrough particles being deflected outside the detector acceptance.…”

“…The RD5 collaboration at CERN [2] was formed to study topics related to muon detection at future hadron colliders. These topics included: measurement of the total punchthrough probability of hadronic showers [3], measurement of angular and momentum distributions of punchthrough muons [4] and study of the influence of a strong magnetic field on punchthrough particles. In addition, RD5 has conducted muon trigger studies, investigated the effect of electromagnetic secondaries on muon measurement [5] and tested various types of large area muon detectors.…”