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Measurement of single π⁰ production by coherent neutral-current ν Fe interactions in the MINOS Near Detector

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arxiv 1608.05702 v3 pith:2RNGLR3U submitted 2016-08-19 hep-ex

Measurement of single π⁰ production by coherent neutral-current ν Fe interactions in the MINOS Near Detector

classification hep-ex
keywords coherentmathcalproductiontextdetectorneutral-currentcrossforward
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Forward single $\pi^0$ production by coherent neutral-current interactions, $\nu \mathcal{A} \to \nu \mathcal{A} \pi^0$, is investigated using a 2.8$\times 10^{20}$ protons-on-target exposure of the MINOS Near Detector. For single-shower topologies, the event distribution in production angle exhibits a clear excess above the estimated background at very forward angles for visible energy in the range~1-8 GeV. Cross sections are obtained for the detector medium comprised of 80% iron and 20% carbon nuclei with $\langle \mathcal{A} \rangle = 48$, the highest-$\langle \mathcal{A} \rangle$ target used to date in the study of this coherent reaction. The total cross section for coherent neutral-current single-$\pi^0$ production initiated by the $\nu_\mu$ flux of the NuMI low-energy beam with mean (mode) $E_{\nu}$ of 4.9 GeV (3.0 GeV), is $77.6\pm5.0\,(\text{stat}) ^{+15.0}_{-16.8}\,(\text{syst})\times10^{-40}\,\text{cm}^2~\text{per nucleus}$. The results are in good agreement with predictions of the Berger-Sehgal model.

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