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Register a new userMeasurement of $bar{ u}_{mu}$ charged-current single $pi^{-}$ production on hydrocarbon in the few-GeV region using MINERvA
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The antineutrino scattering channel $bar{ u}_{mu} ,text{CH} rightarrow mu^{+} ,pi^{-} ,X$(nucleon(s)) is analyzed in the incident energy range 1.5 to 10 GeV using the MINERvA detector at Fermilab. Differential cross sections are reported as functions of $mu^{+}$ momentum and production angle, $pi^{-}$ kinetic energy and production angle, and antineutrino energy and squared four-momentum transfer. Distribution shapes are generally reproduced by simulations based on the GENIE, NuWro, and GiBUU event generators, however GENIE (GiBUU) overestimates (underestimates) the cross-section normalizations by 8% (10%). Comparisons of data with the GENIE-based reference simulation probe conventional treatments of cross sections and pion intranuclear rescattering. The distribution of non-track vertex energy is used to decompose the signal sample into reaction categories, and cross sections are determined for the exclusive reactions $mu^{+} pi^{-} n$ and $ mu^+ pi^{-} p$. A similar treatment applied to the published MINERvA sample $bar{ u}_{mu} ,text{CH} rightarrow mu^{+} ,pi^{0} ,X$(nucleon(s)) has determined the $mu^{+} pi^{0} n$ cross section, and the latter is used with $sigma(pi^{-} n)$ and $sigma(pi^{-} p)$ to carry out an isospin decomposition of $bar{ u}_{mu}$-induced CC($pi$). The ratio of magnitudes and relative phase for isospin amplitudes $A_{3}$ and $A_{1}$ thereby obtained are: $R^{bar{ u}} = 0.99 pm 0.19$ and $phi^{bar{ u}} = 93^{circ} pm 7^{circ}$. Our results are in agreement with bubble chamber measurements made four decades ago.
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The semi-exclusive channel $ u_{mu}+textrm{CH}rightarrowmu^{-}pi^{0}+textrm{nucleon(s)}$ is analyzed using MINERvA exposed to the low-energy NuMI $ u_{mu}$ beam with spectral peak at $E_{ u} simeq 3$ GeV. Differential cross sections for muon momentum and production angle, $pi^{0}$ kinetic energy and production angle, and for squared four-momentum transfer are reported, and the cross section $sigma(E_{ u})$ is obtained over the range 1.5 GeV $leq E_{ u} <$ 20 GeV. Results are compared to GENIE and NuWro predictions and to published MINERvA cross sections for $ u_{mu}textrm{-CC}(pi^{+})$ and $bar{ u}_{mu}textrm{-CC}(pi^{0})$. Disagreements between data and simulation are observed at very low and relatively high values for muon angle and for $Q^2$ that may reflect shortfalls in modeling of interactions on carbon. For $pi^{0}$ kinematic distributions however, the data are consistent with the simulation and provide support for generator treatments of pion intranuclear scattering. Using signal-event subsamples that have reconstructed protons as well as $pi^{0}$ mesons, the $ppi^{0}$ invariant mass distribution is obtained, and the decay polar and azimuthal angle distributions in the rest frame of the $ppi^{0}$ system are measured in the region of $Delta(1232)^+$ production, $W < 1.4$ GeV.
Single neutral pion production via muon antineutrino charged-current interactions in plastic scintillator (CH) is studied using the minerva detector exposed to the NuMI low-energy, wideband antineutrino beam at Fermilab. Measurement of this process constrains models of neutral pion production in nuclei, which is important because the neutral-current analog is a background for $bar{ u}_e$ appearance oscillation experiments. The differential cross sections for $pi^0$ momentum and production angle, for events with a single observed $pi^0$ and no charged pions, are presented and compared to model predictions. These results comprise the first measurement of the $pi^0$ kinematics for this process.
Separate samples of charged-current pion production events representing two semi-inclusive channels $ u_mu$-CC($pi^{+}$) and $bar{ u}_{mu}$-CC($pi^{0}$) have been obtained using neutrino and antineutrino exposures of the MINERvA detector. Distributions in kinematic variables based upon $mu^{pm}$-track reconstructions are analyzed and compared for the two samples. The differential cross sections for muon production angle, muon momentum, and four-momentum transfer $Q^2$, are reported, and cross sections versus neutrino energy are obtained. Comparisons with predictions of current neutrino event generators are used to clarify the role of the $Delta(1232)$ and higher-mass baryon resonances in CC pion production and to show the importance of pion final-state interactions. For the $ u_mu$-CC($pi^{+}$) ($bar{ u}_{mu}$-CC($pi^{0}$)) sample, the absolute data rate is observed to lie below (above) the predictions of some of the event generators by amounts that are typically 1-to-2 $sigma$. However the generators are able to reproduce the shapes of the differential cross sections for all kinematic variables of either data set.
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 $5.56times10^{20}$ 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 $sigma = (11.76 pm 0.44 text{(stat)} pm 2.39 text{(syst)}) times 10^{-40} text{cm}^2$~$text{nucleon}^{-1}$. 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 measurements of the flux-integrated $bar{ u}_mu$ and $bar{ u}_mu+ u_mu$ charged-current cross-sections on water and hydrocarbon targets using the T2K anti-neutrino beam, with a mean neutrino energy of 0.86 GeV. The signal is defined as the (anti-)neutrino charged-current interaction with one induced $mu^pm$ and no detected charged pion nor proton. These measurements are performed using a new WAGASCI module recently added to the T2K setup in combination with the INGRID Proton module. The phase space of muons is restricted to the high-detection efficiency region, $p_{mu}>400~{rm MeV}/c$ and $theta_{mu}<30^{circ}$, in the laboratory frame. Absence of pions and protons in the detectable phase space of $p_{pi}>200~{rm MeV}/c$ and $theta_{pi}<70^{circ}$, and $p_{rm p}>600~{rm MeV}/c$ and $theta_{rm p}<70^{circ}$ is required. In this paper, both of the $bar{ u}_mu$ cross-sections and $bar{ u}_mu+ u_mu$ cross-sections on water and hydrocarbon targets, and their ratios are provided by using DAgostini unfolding method. The results of the integrated $bar{ u}_mu$ cross-section measurements over this phase space are $sigma_{rm H_{2}O},=,(1.082pm0.068(rm stat.)^{+0.145}_{-0.128}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, $sigma_{rm CH},=,(1.096pm0.054(rm stat.)^{+0.132}_{-0.117}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, and $sigma_{rm H_{2}O}/sigma_{rm CH} = 0.987pm0.078(rm stat.)^{+0.093}_{-0.090}(rm syst.)$. The $bar{ u}_mu+ u_mu$ cross-section is $sigma_{rm H_{2}O} = (1.155pm0.064(rm stat.)^{+0.148}_{-0.129}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, $sigma_{rm CH},=,(1.159pm0.049(rm stat.)^{+0.129}_{-0.115}(rm syst.)) times 10^{-39}~{rm cm^{2}/nucleon}$, and $sigma_{rm H_{2}O}/sigma_{rm CH},=,0.996pm0.069(rm stat.)^{+0.083}_{-0.078}(rm syst.)$.
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