9 research outputs found
PRIMARY ELECTIONS IN THE SOUTH: A STUDY IN UNIPARTY POLITICS, by Cortez A. M. Ewing. University of Oklahoma Press, Norman, 1953. Pp. xii, 112. $2.75.
Characterization of nuclear effects in muon-neutrino scattering on hydrocarbon with a measurement of final-state kinematics and correlations in charged-current pionless interactions at T2K
This paper reports measurements of final-state proton multiplicity, muon and proton kinematics, and
their correlations in charged-current pionless neutrino interactions, measured by the T2K ND280 near
detector in its plastic scintillator (C8H8) target. The data were taken between years 2010 and 2013,
corresponding to approximately 6 × 1020 protons on target. Thanks to their exploration of the proton
kinematics and of imbalances between the proton and muon kinematics, the results offer a novel probe of
the nuclear-medium effects most pertinent to the (sub-)GeV neutrino-nucleus interactions that are used in
accelerator-based long-baseline neutrino oscillation measurements. These results are compared to many
neutrino-nucleus interaction models which all fail to describe at least part of the observed phase space.
In case of events without a proton above a detection threshold in the final state, a fully consistent
implementation of the local Fermi gas model with multinucleon interactions gives the best description of
the data. In the case of at least one proton in the final state, the spectral function model agrees well with the
data, most notably when measuring the kinematic imbalance between the muon and the proton in the plane
transverse to the incoming neutrino. Within the models considered, only the existence of multinucleon
interactions are able to describe the extracted cross section within regions of high transverse kinematic
imbalance. The effect of final-state interactions is also discussed
Measurement of the muon neutrino charged-current single π+ production on hydrocarbon using the T2K off-axis near detector ND280
We report the measurements of the single and double differential cross section of muon neutrino charged-current interactions on carbon with a single positively charged pion in the final state at the T2K off-axis near detector using 5.56×1020 protons on target. The analysis uses data control samples for the background subtraction and the cross section signal, defined as a single negatively charged muon and a single positively charged pion exiting from the target nucleus, is extracted using an unfolding method. The model-dependent cross section, integrated over the T2K off-axis neutrino beam spectrum peaking at 0.6 GeV, is measured to be σ=(11.76±0.44(stat)±2.39(syst))×10-40 cm2 nucleon-1. Various differential cross sections are measured, including the first measurement of the Adler angles for single charged pion production in neutrino interactions with heavy nuclei target.We report the measurements of single and double differential cross section of muon neutrino charged-current interactions on carbon with a single positively charged pion in the final state at the T2K off-axis near detector using protons on target. The analysis uses data control samples for the background subtraction and the cross section signal, defined as a single negatively charged muon and a single positively charged pion exiting from the target nucleus, is extracted using an unfolding method. The model dependent cross section, integrated over the T2K off-axis neutrino beam spectrum peaking at ~GeV, is measured to be ~. Various differential cross sections are measured, including the first measurement of the Adler angles for single charged pion production in neutrino interactions with heavy nuclei target
J-PARC neutrino beamline upgrade technical design report
In this document, technical details of the upgrade plan of the J-PARC neutrino beamline for the extension of the T2K experiment are described. T2K has proposed to accumulate data corresponding to protons-on-target in the next decade, aiming at an initial observation of CP violation with or higher significance in the case of maximal CP violation. Methods to increase the neutrino beam intensity, which are necessary to achieve the proposed data increase, are described