The SciBooNE Collaboration has measured neutral current neutral pion production by the muon neutrino beam at a polystyrene target (C8H8). We obtained (7.7+- 0.5(stat.)+0.4-0.5 (sys.)) x 10^-2 as cross section ratio of the neutral current neutral pion production to total charged current cross section at the mean neutrino energy of 1.16 GeV. This result is consistent with the Monte Carlo prediction based on the Rein-Sehgal model
Cross-sections of large-angle hadron production in proton- and pion-nucleus interactions VI: carbon nuclei and beam momenta from \pm 3 GeV/c to \pm 15 GeV/c
The NA62 experiment at CERN collected a large sample of charged kaon decays with a highly efficient trigger for decays into electrons in 2007. The kaon beam represents a source of tagged neutral pion decays in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion in the time-like region from $1.05\times10^6$ fully reconstructed $π^0$ Dalitz decay is presented. The limits on dark photon production in $π^0$ decays from the earlier kaon experiment at CERN, NA48/2, are also reported.
After highlighting the importance of neutrino cross section modeling for neutrino oscillation measurements, the most recent neutrino cross section measurements are presented. New preliminary results are available from T2K for the measurement of charged current interactions on carbon without pions in the final state, single pion production in water, coherent pion production in carbon and charged current inclusive interactions in carbon as a function of neutrino energy. Few other results already published by the MINERvA and T2K collaborations are also discussed.
NA61/SHINE is a fixed target experiment designed to study hadron-proton, hadron-nucleus and nucleus-nucleus interactions at the CERN Super-Proton-Synchrotron. In this proceeding we present results on spectra of identified hadrons produced in pion-carbon production interactions, which are of fundamental importance to improve the extensive air shower modeling, and hence the interpretation of ultra-high-energy-cosmic-rays measurements. In particular, our measurements of (anti)baryons and $ρ^0$ production in pion-carbon interactions can contribute to improve the predictions of muon production by a…
Recently, the RHICf Collaboration measured the transverse single-spin asymmetries of the very forward neutral pion in polarized $p+p$ collisions at $\sqrt{s}=510$ GeV, produced at large pseudorapidity ($η\gtrsim 6$). The data show large asymmetries both in longitudinal momentum fraction $x_F$ and transverse momentum $p_T$ at $p_T<1\,\mathrm{GeV}/c$. Employing baryonic triple Regge exchanges, we describe the complete RHICf data for the first time and show that the neutral pion production at low $p_T$ can be interpreted as a diffractive one.
Transverse single-spin asymmetries of very forward neutral pions generated in polarized $p + p$ collisions allow us to understand the production mechanism in terms of perturbative and non-perturbative strong interactions. During 2017 the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized $p$+$p$ collisions at $\sqrt{s}$ = 510 GeV. The large non-zero asymmetries increasing both in longitudinal momentum fraction $x…
This analysis aims to study inclusive neutrino-induced Neutral Current (NC) interactions that produce at least one neutral pion ($π^0$) in the final state (incNC$π^0$ ) in the T2K off-axis near detector ND280. The motivation for this study is to better understand/eliminate the background to electron neutrino appearance analyzed at the far detector Super-Kamiokande. As $π^0$ decays are background to the appearance search, a good knowledge of both inclusive and exclusive neutrino interaction cross sections are key to improving associated systematic uncertainties in T2K oscillation analyses. Resu…
