A study of the nuclear medium influence on neutral strange particle production in deep inelastic neutrino scattering

TL;DR

This study investigates how nuclear effects influence the production of neutral strange particles in deep inelastic neutrino scattering, revealing increased multiplicity in nuclear interactions and the role of intranuclear pion interactions.

Contribution

It provides new measurements of neutral strange particle production in nuclear versus quasinucleon interactions, highlighting the impact of nuclear effects and intranuclear pion interactions.

Findings

Mean multiplicity of $V^{ullet}$ particles is higher in nuclear interactions.

The ratio of $V^{ullet}$ to nucleon interactions exceeds that of pions.

Intranuclear pion interactions largely explain the multiplicity increase.

Abstract

The influence of nuclear effects on the production of neutral strange particles ($V^{\circ}$) is investigated using the data obtained with SKAT propane-freon bubble chamber irradiated in the neutrino beam (with $E_{\nu}$ = 3-30 GeV) at Serpukhov accelerator. The measured mean multiplicity of $V^{\circ}$ particles in nuclear interactions, ${<n_{V^{\circ}}>}_A$ = 0.096$\pm$0.011, is found to exceed significantly that in 'quasinucleon' interactions, ${<n_{V^{\circ}}>}_N$ = 0.059$\pm$0.012. The ratio of ${\rho}_{V^{\circ}}$ =${<n_{V^{\circ}}>}_A/{<n_{V^{\circ}}>}_N$ =1.61$\pm$0.23 is larger than that for $\pi^{-}$ mesons, ${\rho}_{\pi^-}$ = 1.10$\pm$0.03. It is shown that a dominant part of the multiplicity gain of $V^{\circ}$ particles can be explained by intranuclear interactions of produced pions.