Neutrino charged current interactions with emulsion and an estimate of hadron formation time

Abstract

In an experiment with a hybrid emulsion spectrometer at Fermilab, the multiplicity and angular characteristics of secondary particles produced in the charged current interactions of nu mu ( nu mu ) with emulsion have been investigated in the framework of a version of the intranuclear cascade model. The data imply that the formation time of the secondary hadrons produced is finite.

A study of backward going p and π− in interactions with the NOMAD detector

“…Experimentally one observes that the cascade is restricted to slow particles only, while the fast ones do not reinteract inside the nucleus. The currently accepted explanation for this effect is the "formation zone" concept [5]- [7]. This is the distance (or the time) from the production point which is required for the secondary hadrons to be "formed", i.e.…”

Finite formation time of hadrons: the QGP signatures

“…Below, we present the theoretical results for neutrino-emulsion interaction and compare with experimental data [4]. Figures 1, 2 show multiplicity distribution of particles from charged-current ν μ -emulsion interactions.…”

“…This process continues until all secondaries escape target nucleus. A part of the energy is spread through the nucleus to produce a fully-equilibrated nucleus ELISEEV The average multiplicities of charged pions and protons produced in charged-current ν μ -emulsion interactions obtained in the experiment [4] compared with the values calculated according to our model at different formation length parameter L f Experiment Theory which then decays statistically. The process of generation of particles is simulated by the Monte-Carlo method.…”

“…(More detailed description of the model and the list of the references about experimental data can be found in [4].) The characteristics of the interactions of the neutrino and of the produced particles with nucleons in nucleus are taken from experiments with free nucleons [4]. (The parton spectra is assumed to be the same as hadronic one.…”

“…Leptonnucleus scattering provides a nontrivial possibility to study space-time evolution of jets inside nuclear matter. In contrast to hadroproduction, intranuclear cascading can be studied without complicate effects of projectile rescattering or interactions of projectile constituent [3,4]. Physics of such reactions is very interesting.…”