66 research outputs found
Measurement of and charged current inclusive cross sections and their ratio with the T2K off-axis near detector
We report a measurement of cross section and the first measurements of the cross section
and their ratio
at (anti-)neutrino energies below 1.5
GeV. We determine the single momentum bin cross section measurements, averaged
over the T2K -flux, for the detector target material (mainly
Carbon, Oxygen, Hydrogen and Copper) with phase space restricted laboratory
frame kinematics of 500 MeV/c. The
results are and $\sigma(\nu)=\left( 2.41\
\pm0.022{\rm{(stat.)}}\pm0.231{\rm (syst.)}\ \right)\times10^{-39}^{2}R\left(\frac{\sigma(\bar{\nu})}{\sigma(\nu)}\right)=
0.373\pm0.012{\rm (stat.)}\pm0.015{\rm (syst.)}$.Comment: 18 pages, 8 figure
Measurement of ¯νμ and νμ charged current inclusive cross sections and their ratio with the T2K off-axis near detector
We report a measurement of cross section σ(νμ+nucleus→μ−+X) and the first measurements of the cross section σ(¯νμ+nucleus→μ++X) and their ratio R(σ(¯ν)σ(ν)) at (anti) neutrino energies below 1.5 GeV. We determine the single momentum bin cross section measurements, averaged over the T2K ¯ν/ν-flux, for the detector target material (mainly carbon, oxygen, hydrogen and copper) with phase space restricted laboratory frame kinematics of θμ500 MeV/c. The results are σ(¯ν)=(0.900±0.029(stat)±0.088(syst))×10−39 and σ(ν)=(2.41±0.022(stat)±0.231(syst))×10−39 in units of cm2/nucleon and R(σ(¯ν)σ(ν))=0.373±0.012(stat)±0.015(syst)
Updated T2K measurements of muon neutrino and antineutrino disappearance using 1.5 x 10(21) protons on target
We report measurements by the T2K experiment of the parameters
and governing the disappearance of muon neutrinos and
antineutrinos in the three flavor neutrino oscillation model. Utilizing the
ability of the experiment to run with either a mainly neutrino or a mainly
antineutrino beam, the parameters are measured separately for neutrinos and
antineutrinos. Using POT in neutrino running mode and
POT in antineutrino mode, T2K obtained,
and eV/c for neutrinos, and
and
eV/c for antineutrinos (assuming normal mass ordering). No
significant differences between the values of the parameters describing the
disappearance of muon neutrinos and antineutrinos were observed.Comment: 8 pages, 2 figure
Search for Lorentz and CPT violation using sidereal time dependence of neutrino flavor transitions over a short baseline
A class of extensions of the Standard Model allows Lorentz and CPT violations, which can be identified
by the observation of sidereal modulations in the neutrino interaction rate. A search for such modulations
was performed using the T2K on-axis near detector. Two complementary methods were used in this study,
both of which resulted in no evidence of a signal. Limits on associated Lorentz and CPT-violating terms
from the Standard Model extension have been derived by taking into account their correlations in this
model for the first time. These results imply such symmetry violations are suppressed by a factor of more
than 10 20 at the GeV scale
First measurement of the νμ charged-current cross section on a water target without pions in the final state
This paper reports the first differential measurement of the charged-current interaction cross section of νμ on water with no pions in the final state. This flux-averaged measurement has been made using the T2K experiment’s off-axis near detector, and is reported in doubly differential bins of muon momentum and angle. The flux-averaged total cross section in a restricted region of phase space was found to be σ=(0.95±0.08(stat)±0.06(det syst)±0.04(model syst)±0.08(flux))×10−38 cm2/n
Measurement of the single pi(0) production rate in neutral current neutrino interactions on water
The single π0 production rate in neutral current neutrino interactions on water in a neutrino beam with a peak neutrino energy of 0.6 GeV has been measured using the PØD, one of the subdetectors of the T2K near detector. The production rate was measured for data taking periods when the PØD contained water (2.64×10(20) protons-on-target) and also periods without water (3.49×10(20) protons-on-target). A measurement of the neutral current single π0 production rate on water is made using appropriate subtraction of the production rate with water in from the rate with water out of the target region. The subtraction analysis yields 106 ± 41 ± 69 signal events where the uncertainties are statistical (stat.) and systematic (sys.) respectively. This is consistent with the prediction of 157 events from the nominal simulation. The measured to expected ratio is 0.68 ± 0.26 (stat) ± 0.44 (sys) ± 0.12 (flux). The nominal simulation uses a flux integrated cross section of 7.63×10(−39)cm(2) per nucleon with an average neutrino interaction energy of 1.3 GeV
Effect of Zinc Level and Source (Zinc Oxide Vs. Zinc Glycine) on Bone Mechanical and Geometric Parameters, and Histomorphology in Male Ross 308 Broiler Chicken
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
Search for light sterile neutrinos with the T2K far detector Super-Kamiokande at a baseline of 295 km
We perform a search for light sterile neutrinos using the data from the T2K far detector at a baseline of 295 km, with an exposure of 14.7ð7.6Þ × 1020 protons on target in neutrino (antineutrino) mode. A selection of neutral-current interaction samples is also used to enhance the sensitivity to sterile mixing.
No evidence of sterile neutrino mixing in the 3 þ 1 model was found from a simultaneous fit to the charged-current muon, electron and neutral-current neutrino samples. We set the most stringent limit on the sterile oscillation amplitude sin2 θ24 for the sterile neutrino mass splitting Δm241 < 3 × 10−3 eV2=c4
Search for CP Violation in Neutrino and Antineutrino Oscillations by the T2K Experiment with 2.2 x 10(21) Protons on Target
The T2K experiment measures muon neutrino disappearance and electron neutrino
appearance in accelerator-produced neutrino and antineutrino beams. With an
exposure of protons on target in neutrino
(antineutrino) mode, 89 candidates and 7 anti- candidates were
observed while 67.5 and 9.0 are expected for and normal mass
ordering. The obtained confidence interval for the violating
phase, , does not include the -conserving cases
(). The best-fit values of other parameters are
and .Comment: 9 pages, 6 figure
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