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Register a new userNeutral Current Elastic Interactions in MiniBooNE
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Ranjan Dharmapalan
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Neutral Current Elastic (NCE) interactions in MiniBooNE are discussed. In the neutrino mode MiniBooNE reported: the flux averaged NCE differential cross section as a function of four-momentum transferred squared, an axial mass M_{A} measurement, and a measurement of the strange quark spin content of the nucleon, Delta s. In the antineutrino mode we present the background-subtracted data which is compared with the Monte Carlo predictions.
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The neutrino-induced charged-current quasi-elastic (CCQE, $ u_l+nto l^-+p$ or $bar u_l+pto l^++n$) interaction is the most abundant interaction around 1 GeV, and it is the most fundamental channel to study neutrino oscillations. Recently, MiniBooNE published both muon neutrino and muon anti-neutrino double differential cross sections on carbon. In this review, we describe the details of these analyses and include some historical remarks.
MiniBooNE anti-neutrino charged-current quasi-elastic (CCQE) data is compared to model predictions. The main background of neutrino-induced events is examined first, where three independent techniques are employed. Results indicate the neutrino flux is consistent with a uniform reduction of $sim$ 20% relative to the largely uncertain prediction. After background subtraction, the $Q^{2}$ shape of $ umub$ CCQE events is consistent with the model parameter $M_{A}$ = 1.35 GeV determined from MiniBooNE $ umu$ CCQE data, while the normalization is $sim$ 20% high compared to the same prediction.
Neutrino oscillation is the only known phenomenon for physics beyond the standard model. To investigate this phenomenon, the understanding of low energy neutrino scattering (200<E<2000 MeV) is the crucial task for high energy physicists. In this energy region, the charged current quasi-elastic (CCQE) neutrino interaction is the dominant process, and experiments require a precise model to predict signal samples. Using a high-statistics sample of muon neutrino CCQE events, MiniBooNE finds that a simple Fermi gas model, with appropriate adjustments, accurately characterizes the CCQE events on carbon. The extracted parameters include an effective axial mass, MA=1.23 +- 0.20 GeV, and a Pauli-blocking parameter, kappa = 1.019 +- 0.011.
We report a measurement of the flux-averaged neutral-current elastic differential cross section for neutrinos scattering on mineral oil (CH$_2$) as a function of four-momentum transferred squared. It is obtained by measuring the kinematics of recoiling nucleons with kinetic energy greater than 50~MeV which are readily detected in MiniBooNE. This differential cross-section distribution is fit with fixed nucleon form factors apart from an axial mass, $M_{A}$, that provides a best fit for $M_A= 1.39pm0.11$~GeV. Additionally, single protons with kinetic energies above 350 MeV can be distinguished from neutrons and multiple nucleon events. Using this marker, the strange quark contribution to the neutral-current axial vector form factor at $Q^2 = 0$, $Delta s$, is found to be $Delta s=0.08pm0.26$.
We report the measurement of the flux-averaged antineutrino neutral current elastic scattering cross section ($dsigma_{bar u N rightarrow bar u N}/dQ^{2}$) on CH$_{2}$ by the MiniBooNE experiment using the largest sample of antineutrino neutral current elastic candidate events ever collected. The ratio of the antineutrino to neutrino neutral current elastic scattering cross sections and a ratio of antineutrino neutral current elastic to antineutrino charged current quasi elastic cross section is also presented.
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