Abstract
Measurements of hadron production in p+C interactions at 31 GeV/c are performed using the NA61/ SHINE spectrometer at the CERN SPS. The analysis is based on the full set of data collected in 2009 using a graphite target with a thickness of 4% of a nuclear interaction length. Inelastic and production cross sections as well as spectra of $\pi^\pm$, $K^\pm$, p, $K^0_S$ and $\Lambda$ are measured with high precision. These measurements are essential for improved calculations of the initial neutrino fluxes in the T2K long-baseline neutrino oscillation experiment in Japan. A comparison of the NA61/SHINE measurements with predictions of several hadroproduction models is presented.
Highlights
The detector systematic uncertainty of 2009 is significantly smaller. It is a consequence of the fact that in 2009 the beam triggers were recorded by data acquisition (DAQ) simultaneously with physics triggers
In order to avoid uncertainties related to the different treatment of quasi-elastic interactions and to the absence of predictions for inclusive cross sections, spectra are normalized to the mean particle multiplicity in all production interactions
These data are crucial for predictions of the initial neutrino fluxes in the T2K long baseline neutrino oscillation experiment in
Summary
These measurements are essential for improved calculations of the initial neutrino fluxes in the T2K long-baseline neutrino oscillation experiment in Japan. Protons contributing to the predicted neutrino flux at SK in the “positive” focusing configuration, and the regions covered by the previously published NA61/SHINE measurements [5,6] and by the new results presented in this article. Neutrino oscillations are probed by comparing the neutrino event rates and spectra measured in SK to predictions of a Monte-Carlo (MC) simulation based on flux calculations and near detector measurements. Precise predictions of neutrino fluxes are crucial for neutrino cross section measurements with the T2K near detector, see e.g. Refs. An anti-neutrino enhanced beam can be produced by reversing the current direction in the focusing elements of the beamline in order to focus negatively charged particles (“negative” focusing)
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