Charged current antineutrino reactions fromC12at MiniBooNE energies

Abstract

A study of charged current induced anti-neutrino interactions from nuclei has been done for the intermediate energy (< 2GeV) anti-neutrinos and applied to 12 C, relevant for ongoing experiment by MiniBooNE collaboration. The calculations have been done for the quasielastic and inelastic lepton production as well as for the incoherent and the coherent pion production processes. The calculations are done in local density approximation. In the case of the quasielastic reaction the effects of Pauli blocking, Fermi motion effects, renormalization of weak transition strengths in nuclear medium and the Coulomb distortion of the outgoing lepton have been taken into account. For the inelastic processes the calculations have been done in the ∆ dominance model and take into account the effect of Pauli blocking, Fermi motion of the nucleon and renormalization of ∆ properties in a nuclear medium. The effect of final state interactions of pions is also taken into account. The numerical results for the total cross sections for the charged current quasielastic scattering and incoherent pion production processes are compared with earlier experimental results available in Freon and Freon-Propane. It is found that nuclear medium effects give strong reduction in the cross sections leading to satisfactory agreement with the available data.

Amplitude analyses of the decaysχc1→ηπ+π−andχc1Adams1, Napolitano2, Ecklund3 et al. 2011Phys. Rev. D322180View full textAdd to dashboardCite

“…The resulting a 0 (980) parameters are given in Table IV, where the first error is statistical and the second error is systematic, obtained by trying various combinations of ππ isobars to fit the region in π + π − invariant mass around 2.0 GeV/c 2 , a peak attributed to the f 4 (2050) resonance in the baseline fit. The a 0 (980) Flatté distribution parameters, which are consistent with a previous determination by CLEO [20], are subsequently fixed in the baseline fit to the full data sample. It is worth noting that the a 0 (980) lineshape in ηπ is rather insensitive to the a 0 (980) → η ′ π coupling g η ′ π .…”

Amplitude analysis of the χc1→ηπ+π− decays

“…3(a). Two-body structures reported in previous analyses of the χ c1 → ηπ + π − decays, by BESII [26] and CLEO [10,27], the a 0 (980)π, a 2 (1320)π and f 2 (1270)η, are indicated by the long-dash-dotted, dashed and dashdotted arrows pointing into the Dalitz space, respectively. One feature of this distribution is the excess of events in the upper left corner of the Dalitz plot (a), pointed to by the dotted arrows, which cannot be associated with known structures observed in previous analyses of this χ c1 decay.…”

Heavy quarkonium: progress, puzzles, and opportunities

“…These include two-meson decays at BESII [572], CLEO [573], and Belle [485,[487][488][489]491]; two-baryon decays at CLEO [574]; three-meson decays at CLEO [575] and BESII [576]; four-meson decays at BESII [577][578][579][580], CLEO [581], and BELLE [442]; as well as others like 4πpp and pnπ 0 at BESII [563,582]. More work is required on the theoretical front to understand the wide variety of hadronic χ cJ (1P ) decays now experimentally observed.…”