Speaker
Davide Sgalaberna
(Eidgenoessische Tech. Hochschule Zuerich (CH))
Description
The largest source of uncertainty on the initial neutrino flux in modern
accelerator neutrino experiments is the poor knowledge on the production
of hadrons that decay into neutrinos. T2K is a long baseline
neutrino experiment that aims to precisely measure the parameters
of the PMNS matrix via the $\nu_{\mu} \to \nu_e$ appearance and $\nu_{\mu}$
disappearance as well as to look for the first indication of CP violation
in the lepton sector. The required total systematic uncertainty
on the neutrino flux as low as 5% can hopefully be achieved with high
precision hadron production measurements, performed by the dedicated
auxiliary NA61/SHINE experiment at the CERN SPS. Production of hadrons
in 31 GeV/c proton interactions on Carbon is measured with a thin
target (4% of the nuclear interaction length) to study the primary
interactions and with a T2K replica target (1.9 interaction length)
to investigate re-interactions in the long target.
The low statistic pilot data-set taken in 2007 was used to measure hadron
multiplicities with the thin target and to demonstrate the capabilities of
the spectrometer with the T2K replica target. High statistics 2009 and
2010 runs have been used to perform precise measurements. The latest 2009
results on charged pion, kaon and proton spectra are presented and
experimental data are compared to model predictions.
The re-weighting procedure used to tune the T2K neutrino flux is presented
as well. This method will be very important also for the future neutrino
long-baseline experiments for which a precision of about 2% on the flux
knowledge is required for the discovery of CP violation in the lepton
sector.
| WG1: Neutrino Oscillation Physics (Yes/No) | Yes |
|---|---|
| WG2: Neutrino Scattering Physics (Yes/No) | Yes |
| WG3: Accelerator Physics (Yes/No) | No |
| WG4: Muon Physics (Yes/No) | No |
| Type of presentation | Oral presentation |
Author
Davide Sgalaberna
(Eidgenoessische Tech. Hochschule Zuerich (CH))
