Associated Hyperon–kaon Production via Neutrino–nucleus Scattering

Abstract

We present the investigation of the neutrino-induced strangeness associated production on nuclei in the relativistic plane wave impulse approximation (RPWIA) framework at the intermediate neutrino energies. In this study, the elementary hadronic weak amplitudes are embedded inside the nuclear medium for the description of the exclusive channels of neutrino-nucleus interactions. These amplitudes are extracted using a modeldependent evaluation of the hadronic vertex using the Born term approximation in which the application of the Cabibbo V-A theory and SU(3) symmetry are assumed to be valid. The nuclear effects are included via the bound state wavefunctions of the nucleon obtained from the relativistic mean field (RMF) models. Two kinematics settings are used to examine various distributions of the differential cross section in the rest frame of the target nuclei. The numerical results are obtained for the neutrino-induced chargedcurrent (CC) K + Λ-production on bound neutrons in 1s 1/2 and 1p 3/2 orbitals of 12 C.The angular distributions are forward peaked under both kinematic settings, whereas under the quasifree setting the cross sections tend mimic the missing momentum distribution of the bound nucleon inside the nucleus.

Charged kaon production by coherent scattering of neutrinos and antineutrinos on nuclei

“…[4,12,13] use SU(3) symmetry and phenomenological information about nucleon form factor and hyperon decays to calculate the cross sections forν l N → l + Y , with Y = Λ, Σ. A similar study was performed by Adera et al [14,15] for charge-changing associated strangeness production ν l N → l − K Y in the threshold region. Finally, a model for ∆S = ±1 single (anti)kaon production processes ν l N → l − K N andν l N → l +K N close to threshold based on SU(3) chiral Lagrangians was developed in Refs.…”

“…On the theoretical side, after the pioneering papers of Refs. [8][9][10][11], addressing associated strangeness [8][9][10], single hyperon production [10] and other ∆S = ±1 reactions [11], new work has emerged only recently [4,[12][13][14][15][16][17]. References.…”

“…With the exception of Refs. [4,15], all the theoretical studies mentioned above assume single nucleon targets. However, all neutrino experiments are performed on nuclear targets, for which nuclear medium effects and final state interactions of the outgoing particles play an important role.…”