Is There a High-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>y</mml:mi></mml:math>Anomaly in Antineutrino Interactions?

Abstract

We have analyzed data taken in the CERN narrow-band neutrino and antineutrino beams with regard to the "high-$y$ anomaly" observed by previous experiments at Fermilab. At neutrino energies between 30 and 200 GeV, the $\overline{\ensuremath{\nu}}$ and $\ensuremath{\nu}$ charged-current cross-section ratios and muon-inelasticity distributions disagree with the earlier results. In particular, there is no evidence for energy-dependent effects in the antineutrino data which constitute an important aspect of the alleged anomaly.