Nuclear Structure Functions in the Large x Large Q^2 Kinematic Region in Neutrino Deep Inelastic Scattering

TL;DR

This paper investigates nuclear structure functions at large Bjorken x and high Q^2 in neutrino deep inelastic scattering, revealing excess events not explained by simple models and proposing a multi-quark cluster explanation.

Contribution

It introduces an exponential model for the structure function at large x, incorporating multi-quark clusters to better fit the experimental data.

Findings

Significant excess of events at large x not explained by no-nuclear-effect models.

Fermi gas motion alone does not account for the excess.

Exponential fall-off with parameter s=8.3 provides the best fit to data.

Abstract

Data from the CCFR E770 Neutrino Deep Inelastic Scattering (DIS) experiment at Fermilab contain events with large Bjorken x (x>0.7) and high momentum transfer (Q^2>50 (GeV/c)^2). A comparison of the data with a model based on no nuclear effects at large x, shows a significant excess of events in the data. Addition of Fermi gas motion of the nucleons in the nucleus to the model does not explain the excess. Adding a higher momentum tail due to the formation of ``quasi-deuterons'' makes some improvement. An exponentially falling F_2 \propto e^-s(x-x_0) at large x, predicted by ``multi-quark clusters'' and ``few-nucleon correlations'', can describe the data. A value of s=8.3 \pm 0.7(stat.)\pm 0.7(sys.) yields the best agreement with the data.