RevModPhys.84.1307

Energies ie lower momentum transfers second the

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Unformatted text preview: ineutrino cross sections are typically less well measured than their neutrino counterparts. This is generally due to lower statistics and larger background contamination present in that case. Most of our knowledge of neutrino cross sections in this intermediate energy range comes from early experiments that collected relatively small data samples (tens-to-a-fewthousand events). These measurements were conducted in cross section / E (10-38 cm2 / GeV) E (GeV) FIG. 8. Predicted processes to the total CC inclusive scattering cross section at intermediate energies. The underlying quasielastic, resonance, and deep inelastic scattering contributions can produce a variety of possible final states including the emission of nucleons, single pions, multipions, kaons, as well as other mesons (not shown). Combined, the inclusive cross section exhibits a linear dependence on neutrino energy as the neutrino energy increases. Rev. Mod. Phys., Vol. 84, No. 3, July–September 2012 1323 0.4 TOTAL 0.35 0.3 0.25 0.2 DIS QE RES 0.15 0.1 0.05 0 10 -1 1 10 10 2 E (GeV) FIG. 9. Total neutrino and antineutrino per nucleon CC cross sections (for an isoscalar target) divided by neutrino energy and plotted as a function of energy. Data are the same as in Figs. 28, 11, and 12, with the inclusion of additional lower energy CC inclusive data from m (Baker et al., 1982), Ã (Baranov et al., 1979), j (Ciampolillo et al., 1979), and ? (Nakajima et al., 2011). Also shown are the various contributing processes that will be investigated in the remaining sections of this review. These contributions include quasielastic scattering (dashed), resonance production (dotdashed), and deep inelastic scattering (dotted). Example predictions for each are provided by the NUANCE generator (Casper, 2002). Note that the quasielastic scattering data and predictions have been averaged over neutron and proton targets and hence have been divided by a factor of 2 for the purposes of this plot. the 1970s and 1980s using either bubble chamber or spark chamber detectors and represent a large fraction of the data presented in the summary plots we show. Over the years, interest in this energy region waned as efforts migrated to higher energies to yield larger event samples and the focus centered on measurement of electroweak parameters (sin2 W ) and structure functions in the deep inelastic scattering region. With the discovery of neutrino oscillations and the advent of higher intensity neutrino beams, however, this situation has been rapidly changing. The processes discussed here are important because they form some of the dominant signal and background channels for experiments searching for neutrino oscillations. This is especially true for experiments that use atmospheric or accelerator-based sources of neutrinos. With a view to better understanding these neutrino cross sections, new experiments such as Argon Neutrino Test (ArgoNeuT), KEK to Kamioka (K2K), Mini Booster Neutrino Experiment (MiniBooNE), Ma...
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