Polarized Single Top Production at Leptonic Colliders from Broken R Parity Interactions Incorporating CP Violation

TL;DR

This paper investigates how R parity violating interactions can produce polarized single top quarks at leptonic colliders, highlighting CP violation effects and their potential observable asymmetries in decay distributions.

Contribution

It introduces a novel analysis of CP-odd asymmetries in single top production via R parity violation, including both tree and loop level interference effects.

Findings

Characteristic distributions distinguish signal from background.

A measurable CP asymmetry in lepton energy distributions is predicted.

Interference effects depend on CP-odd phases in R parity violating couplings.

Abstract

The contribution from the R parity violating interactions in the associated production of a top quark with a charm antiquark is examined for high energy leptonic colliders. We concentrate on the reactions associated with the semileptonic top decay. A set of characteristic dynamical distributions for the signal events is evaluated and the results contrasted against those from the standard model W-boson pair production background. Next, we turn to a study of a CP-odd observable, associated with the top spin, which leads to an asymmetry in the energy distribution of the emitted charged leptons for the pair of CP-conjugate final states, $b \bar l \nu \bar c$ and $ \bar b l \bar \nu c $. A non vanishing asymmetry arises from a CP-odd phase, embedded in the R parity violating coupling constants, through interference terms between the R parity violating amplitudes at both the tree and loop levels.