Speaker
Description
The study of neutrino interactions with nucleons and nuclear targets is quite important, in the few GeV energy region, in the analysis of the neutrino oscillation experiments being performed with accelerator and atmospheric neutrinos. The present goal of the experimenters is to measure with better precision the various neutrino oscillation parameters, like the mixing angles, the mass-squared-difference of the neutrino mass eigenstates, CP violating phase $\delta$ in the lepton sector as well as to determine the mass hierarchy of the neutrino mass eigenstates, for which the simultaneous knowledge of neutrino and antineutrino cross sections in the same energy region, for a given nuclear target is required. In the few GeV energy region of neutrinos and antineutrinos, the contribution to the total scattering cross section comes from the quasielastic, inelastic, and deep inelastic scattering processes. However, in the case of antineutrinos, additional contribution comes from the single hyperon production, which although Cabibbo suppressed is significant in the antineutrino energy region of $\sim$ 0.5 -- 1.5 GeV. The production of hyperons in the neutrino induced reactions is forbidden by the $\Delta S = \Delta Q$ rule. Moreover, with the increase in (anti)neutrino energy~($E_{\nu} \approx 1.5$~GeV), the production of hyperons proceeds via the associated particle production
\begin{equation}
\nu_{l}(\bar{\nu}_l) + N \longrightarrow l^{\mp} + Y+K,
\end{equation}
where $l=e,\mu,\tau$ and $Y=\Lambda, \Sigma^{0,-}$. The study of hyperon production in the $\Delta S=0$ and 1 channels are limited both theoretically as well as experimentally. Therefore, in this work, we plan to study the hyperon production in the (anti)neutrino induced reactions from the free nucleon target.
Apart from being significant in the analysis of neutrino oscillation parameters, the study of single hyperon production is important in its own right as it provides information about the nucleon-hyperon transition form factors at high $Q^2$, which are presently known only at low $Q^2$ from the study of the semileptonic decays of hyperons, where the symmetries of the weak hadronic current like the T-invariance, G-invariance, and SU(3) symmetry could also be tested. We have studied the dependence of different vector and axial vector currents including the second class current form factors on the total and differential cross section as well as the time reversal and G-parity violations in the antineutrino induced single hyperon production.
The results shall be presented for the total and differential scattering cross sections for the hyperon production in the $|\Delta S| = 0$ and 1 channels in the charged current (anti)neutrino scattering from free nucleons as well as from the nuclear targets like carbon, argon, and lead.
| Session | Neutrino Physics |
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