RevModPhys.84.1307

The process is dominated by production of the 1232

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Unformatted text preview: ance production models by measuring invariant mass and angular distributions. However, many of these tests were often limited in statistics. Compared to their charged current counterparts, measurements of neutral-current single pion cross sections tend to be much more sparse. Most of these data exist in the form of NC and CC cross section ratios (Table XI); however, a limited number of absolute cross section measurements were also performed over the years (Figs. 16–21). Today, improved measurements and predictions of neutrino-induced single pion production have become increasingly important because of the role such processes play in the interpretation of neutrino oscillation data (Walter, 2007). In this case, both NC and CC processes contribute. NC 0 production is often the largest  -induced background in experiments searching for  ! e oscillations. In addition, CC  production processes can present a non-negligible complication in the determination of neutrino energy in experiments measuring parameters asso" ciated with  and  disappearance. Since such neutrino oscillation experiments use heavy materials as their neutrino ANL, PRD 19, 2521 (1979), H , D 1 TABLE X. Measurements of antineutrino CC single pion production from BEBC (Allasia et al., 1983; Allen et al., 1986; Jones et al., 1989), FNAL (Barish et al., 1980), Gargamelle (Bolognese et al., 1979), and Sepukhov heavy liquid chamber (SKAT) (Grabosch et al., 1989). 2 2 ANL, PRD 25, 1161 (1982), H , D 2 2 BEBC, NP B343, 285 (1990), D 2 0.8 BNL, PRD 34, 2554 (1986), D 2 SKAT, ZP C41, 527 (1989), CF Br 3 NUANCE (M =1.1 GeV) µ -p 0) (10 A 0.6 ( µn -38 cm2 / nucleon) FIG. 13. Existing measurements of the cross section for the CC process,  p ! À pþ , as a function of neutrino energy. Also shown is the prediction from Casper (2002) assuming MA ¼ 1:1 GeV. Modern measurements (Table XII) exist but cannot be directly compared with this historical data. 0.2 Channel Experiment Target No. Events BEBC BEBC GGM FNAL SKAT D2 H2 CF3 Br H2 CF3 Br 300 609 282 175 145 GGM SKAT CF3 Br CF3 Br 179 83 BEBC GGM SKAT D2 CF3 Br CF3 Br 545 266 178  p ! þ pÀ : " 0.4 0 1 10 10 2 E (GeV) FIG. 14. Existing measurements of the cross section for the CC process,  n ! À p0 , as a function of neutrino energy. Also shown is the prediction from Casper (2002) assuming MA ¼ 1:1 GeV. Modern measurements (Table XII) exist but cannot be directly compared with this historical data. Rev. Mod. Phys., Vol. 84, No. 3, July–September 2012  p ! þ n0 : "  n ! þ nÀ : " Joseph A. Formaggio and G. P. Zeller: From eV to EeV: Neutrino cross sections . . . 1329 TABLE XI. Measurements of NC and CC single pion cross section ratios (N ¼ n; p). The Gargamelle data have been corrected to a free nucleon ratio (Krenz et al., 1978a). Experiment Target NC/CC ratio Value Reference ANL ANL ANL ANL ANL GGM CERN PS BNL BNL ANL H2 H2 H2 H2 D2 C3 H8 CF3 Br Al Al Al D2 ð p !  p0 Þ=ð p ! ...
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This document was uploaded on 09/28/2013.

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