Fermion helicity flip by parity violating torsion

TL;DR

This paper investigates how a Dirac fermion's helicity can flip due to interactions with a parity-violating torsion field modeled by a Kalb-Ramond field, revealing a finite flip amplitude influenced by pseudo-tensor terms.

Contribution

It demonstrates the existence of a finite helicity flip amplitude for massive fermions interacting with a parity-violating torsion field represented by a Kalb-Ramond field, highlighting the role of pseudo-tensor contributions.

Findings

Finite helicity flip amplitude for massive fermions

Lowest order contribution proportional to pseudo-tensor term

Helicity flip depends on parity-violating torsion interaction

Abstract

The helicity flip of a spin-1/2 Dirac fermion interacting with a torsion- field endowed with a pseudo-tensorial extension is analysed. Taking the torsion to be represented by a Kalb-Ramond field, we show that there is a finite amplitude for helicity flip for massive fermions. The lowest order contribution is proportional to the pseudo-tensor term.