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Register a new userMeasurement of the Inclusive NuMu Charged Current Cross Section on Carbon in the Near Detector of the T2K Experiment
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Melody Ravonel Salzgeber Dr
Publication date
2013
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T2K has performed the first measurement of u{mu} inclusive charged current interactions on carbon at neutrino energies of ~1 GeV where the measurement is reported as a flux-averaged double differential cross section in muon momentum and angle. The flux is predicted by the beam Monte Carlo and external data, including the results from the NA61/SHINE experiment. The data used for this measurement were taken in 2010 and 2011, with a total of 10.8 x 10^{19} protons-on-target. The analysis is performed on 4485 inclusive charged current interaction candidates selected in the most upstream fine-grained scintillator detector of the near detector. The flux-averaged total cross section is <sigma_CC>_phi =(6.91 +/- 0.13 (stat) +/- 0.84 (syst)) x10^{-39} cm^2/nucleon for a mean neutrino energy of 0.85 GeV.
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The T2K off-axis near detector, ND280, is used to make the first differential cross-section measurements of electron neutrino charged current interactions at energies ~1 GeV as a function of electron momentum, electron scattering angle and four-momentum transfer of the interaction. The total flux-averaged $ u_e$ charged current cross-section on carbon is measured to be $1.11pm0.09~(stat)pm0.18~(syst)times10^{-38} cm^2/nucleon$. The differential and total cross-section measurements agree with the predictions of two leading neutrino interaction generators, NEUT and GENIE. The NEUT prediction is $1.23times10^{-38} cm^2/nucleon$ and the GENIE prediction is $1.08times10^{-38} cm^2/nucleon$. The total $ u_e$ charged current cross-section result is also in agreement with data from the Gargamelle experiment.
We report a measurement of the flux-integrated cross section for inclusive muon neutrino charged-current interactions on carbon. The double differential measurements are given as function of the muon momentum and angle. Relative to our previous publication on this topic, these results have an increased angular acceptance and higher statistics. The data sample presented here corresponds to $5.7 times 10^{20}$ protons-on-target. The total flux-integrated cross section is measured to be $(6.950 pm 0.662) times 10^{-39}$ cm$^2$nucleon$^{-1}$ and is consistent with our simulation.
The T2K off-axis near detector, ND280, is used to make the first differential cross section measurements of muon neutrino charged current single positive pion production on a water target at energies ${sim}0.8$ GeV. The differential measurements are presented as a function of muon and pion kinematics, in the restricted phase-space defined by $p_{pi^+}>200$MeV/c, $p_{mu^-}>200$MeV/c, $cos theta_{pi^+}>0.3$ and $cos theta_{mu^-}>0.3$. The total flux integrated $ u_mu$ charged current single positive pion production cross section on water in the restricted phase-space is measured to be $langlesigmarangle_phi=4.25pm0.48 (mathrm{stat})pm1.56 (mathrm{syst})times10^{-40} mathrm{cm}^{2}/mathrm{nucleon}$. The total cross section is consistent with the NEUT prediction ($5.03times10^{-40} mathrm{cm}^{2}/mathrm{nucleon}$) and 2$sigma$ lower than the GENIE prediction ($7.68times10^{-40} mathrm{cm}^{2}/mathrm{nucleon}$). The differential cross sections are in good agreement with the NEUT generator. The GENIE simulation reproduces well the shapes of the distributions, but over-estimates the overall cross section normalization.
The electron (anti-)neutrino component of the T2K neutrino beam constitutes the largest background in the measurement of electron (anti-)neutrino appearance at the far detector. The electron neutrino scattering is measured directly with the T2K off-axis near detector, ND280. The selection of the electron (anti-)neutrino events in the plastic scintillator target from both neutrino and anti-neutrino mode beams is discussed in this paper. The flux integrated single differential charged-current inclusive electron (anti-)neutrino cross-sections, $dsigma/dp$ and $dsigma/dcos(theta)$, and the total cross-sections in a limited phase-space in momentum and scattering angle ($p > 300$ MeV/c and $theta leq 45^{circ}$) are measured using a binned maximum likelihood fit and compared to the neutrino Monte Carlo generator predictions, resulting in good agreement.
We report a measurement of the $ u_{mu}$-nucleus inclusive charged current cross section (=$sigma^{cc}$) on iron using data from exposed to the J-PARC neutrino beam. The detector consists of 14 modules in total, which are spread over a range of off-axis angles from 0$^circ$ to 1.1$^circ$. The variation in the neutrino energy spectrum as a function of the off-axis angle, combined with event topology information, is used to calculate this cross section as a function of neutrino energy. The cross section is measured to be $sigma^{cc}(1.1text{ GeV}) = 1.10 pm 0.15$ $(10^{-38}text{cm}^2/text{nucleon})$, $sigma^{cc}(2.0text{ GeV}) = 2.07 pm 0.27$ $(10^{-38}text{cm}^2/text{nucleon})$, and $sigma^{cc}(3.3text{ GeV}) = 2.29 pm 0.45$ $(10^{-38}text{cm}^2/text{nucleon})$, at energies of 1.1, 2.0, and 3.3 GeV, respectively. These results are consistent with the cross section calculated by the neutrino interaction generators currently used by T2K. More importantly, the method described here opens up a new way to determine the energy dependence of neutrino-nucleus cross sections.
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