Ponente
Sr.
Davide Sgalaberna
(ETH Zurich)
Descripción
One of the main issues in modern accelerator neutrino experiments is
a relatively poor knowledge of the initial neutrino flux, due in
particular to a large uncertainty 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 and to look for the first
indication of CP violation in the lepton sector. A better knowledge of
the neutrino flux is also needed for neutrino cross section measurements.
In order to achieve the required total systematic uncertainty on the
neutrino flux as low as 5\%, high precision hadron production measurements,
performed by the dedicated auxiliary NA61/SHINE experiment at the CERN SPS,
are fundamental.
Interactions of incoming 31 GeV/c protons on Carbon are
measured with a thin target, 4\% of the nuclear interaction length.
Recent results on multiplicities of charged hadrons ($\pi^{\pm}$, $K^{\pm}$ and
protons) will be presented as well as the total p+C production cross
section. Moreover, new measurements on production of neutral strange
particles ($K^0_S$ and $\Lambda$) will be shown. These are crucial
for the reduction of the systematic uncertainties on charged pion
spectra. Production of neutral kaons is also important for an accurate
calculation of the intrinsic $\nu_e$ component in the T2K neutrino beam.
The hadron production measurements based on the high statistics thin target data
are then needed to tune and constrain the T2K neutrino flux. The used re-weighing procedure is presented as well.
This method will be very important also for the future neutrino long-baseline experiments for which is required
a precision of the 2\% on the flux knowledge for the discovery of CP violation in the lepton sector.
Autor primario
Sr.
Davide Sgalaberna
(ETH Zurich)
