Exclusive Hadron Observables in Neutrino Induced $2p2h$ Multinucleon Knockout

Abstract

We explore the combined lepton and hadron kinematic observables from the exclusive Valencia $2p2h$ model. We present variables of interest which are available due to the exclusive kinematics and compare them with the democratically distributed outgoing nucleon kinematics as currently treated in neutrino event generators. We also show the effect of nuclear re-scattering based on the NEUT semi classical cascade. We comment on the observability of these variables in current and future long baseline neutrino detectors.

Figures (12)

• Figure 1: Cross section weighted 2D distribution in energy $q_0$ (y axis) and momentum transfer $|\vec{q}\,|$ (x axis) plane for Valencia $2p2h$ model at increasing neutrino energies. Colours indicates the unit-normalised 2D density. We observe that the $\Delta$-resonance peak becomes visible at higher energy transfers for the highest neutrino energy.
• Figure 2: Normalised event distributions (PDFs) of the asymmetries in Eq. \ref{['eq:Asymmetry']} for the $pp$ final-pair channel at $E_\nu=650~\mathrm{MeV}$. Left: momentum asymmetry $A(p)$; right: energy asymmetry $A(E)$.
• Figure 3: Cross-section--weighted 2D PDF of $|\vec{p}_{\mathrm{L}}^{\,\mathrm{pre}}|$ (x-axis) vs $|\vec{p}_{\mathrm{S}}^{\,\mathrm{pre}}|$ (y-axis) for $E_\nu=650~\mathrm{MeV}$ in the $pp$ channel. Colour indicates the unit-normalised 2D density. Exclusive (left) vs inclusive (right).
• Figure 4: Cross-section--weighted 2D PDF of $|\vec{p}_{\mathrm{L}}^{\,\mathrm{pre}}|$ (top) & $|\vec{p}_{\mathrm{S}}^{\,\mathrm{pre}}|$ (bottom) (y-axis) vs $\theta_\mu$ (x-axis) for $E_\nu=650~\mathrm{MeV}$ in the $pp$ channel. Colour indicates the unit-normalised 2D density. Exclusive (left) vs inclusive (right).
• Figure 5: TKI variables (inclusive versus exclusive) for $E_\nu=650$ MeV $(pp+pn)$. Left, middle and right top panels show the obtained distributions for $\delta p_T$, $\delta \alpha_T$ and $\delta \phi_T$, respectively.