2015/01/31 by Xiu-Lei Ren, Xiulei Ren, E. Oset +3
Physics and Astronomy · #Atomic physics #Baryon #Crystallography #Isospin #Lambda #Neutrino Physics Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quantum mechanics #Strangeness #hep-ex #hep-ph #nucl-th
paper · pdf · doi:10.1103/physrevc.91.045201
published as Phys. Rev. C 91, 045201 (2015) · 13 pages and 9 figures. Minor revision; a discussion about lQCD results added to the Introduction
openalex publication_date 2015/04/06 · arxiv created 2015/04/15 · arxiv updated 2015/04/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We have studied the strangeness-changing antineutrino-induced reactions \ensuremathνlp\ensuremath→l+\ensuremathφB, with \ensuremathφB=K^\ensuremath-p, K0n, \ensuremathπ0\ensuremathΛ, \ensuremathπ0\ensuremathΣ0, \ensuremathη\ensuremathΛ, \ensuremathη\ensuremathΣ0, \ensuremathπ+\ensuremathΣ^\ensuremath-, \ensuremathπ^\ensuremath-\ensuremathΣ+, K+\ensuremathΞ^\ensuremath-, and K0\ensuremathΞ0, using a chiral unitary approach. These ten coupled channels are allowed to interact strongly, using a kernel derived from the chiral Lagrangians. This interaction generates two \ensuremathΛ(1405) poles, leading to a clear single peak in the \ensuremathπ\ensuremathΣ invariant mass distributions. At backward scattering angles in the center-of-mass frame, \ensuremathν_\ensuremathμp\ensuremath→\ensuremathμ+\ensuremathπ0\ensuremathΣ0 is dominated by the \ensuremathΛ(1405) state at around 1420 MeV while the lighter state becomes relevant as the angle decreases, leading to an asymmetric line shape. In addition, there are substantial differences in the shape of \ensuremathπ\ensuremathΣ invariant mass distributions for the three charge channels. If observed, these differences would provide valuable information on a claimed isospin I=1, strangeness S=\ensuremath-1 baryonic state around 1400 MeV. Integrated cross sections have been obtained for the \ensuremathπ\ensuremathΣ and KN channels and the impact of unitarization in the results has been investigated. The number of events with \ensuremathΛ(1405) excitation in \ensuremathν_\ensuremathμp collisions in the recent antineutrino run at the Main Injector Experiment for \ensuremathν-A (MINER\ensuremathνA) has also been obtained. We find that this reaction channel is relevant enough to be investigated experimentally and to be taken into account in the simulation models of future experiments with antineutrino beams.