Abstract
The OPERA experiment was designed to search for nu _{mu } rightarrow nu _{tau } oscillations in appearance mode through the direct observation of tau neutrinos in the CNGS neutrino beam. In this paper, we report a study of the multiplicity of charged particles produced in charged-current neutrino interactions in lead. We present charged hadron average multiplicities, their dispersion and investigate the KNO scaling in different kinematical regions. The results are presented in detail in the form of tables that can be used in the validation of Monte Carlo generators of neutrino–lead interactions.
Highlights
The multiplicity distribution of charged hadrons is an important characteristic of the hadronic final states in hard scattering processes
We report the result on charged hadron production initiated in charged-current νμ interactions in the OPERA target
The basic unit that constitutes the target is the emulsion cloud chamber (ECC) detector which is a stack of nuclear emulsion films acting as high precision trackers interleaved with lead plates that provide a massive target
Summary
The multiplicity distribution of charged hadrons is an important characteristic of the hadronic final states in hard scattering processes Since it reflects the dynamics of the interaction, it has been extensively studied in cosmic rays, fixed target and collider experiments [1,2,3,4,5,6,7]. The excellent spatial resolution of nuclear emulsion allows the determination of the event topology and the measurement of charged particle trajectories. It is well suited for the investigation of the moments of the charged particles multiplicity distribution. A short description of the experimental setup and of the procedure used to locate neutrino interactions in the target is given; the data sample and the analy-
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