Role of transverse polarization in constraining new physics

TL;DR

This paper explores how transverse polarization in electron-positron collisions can be used to detect and constrain new physics interactions, including contact interactions and anomalous couplings, through azimuthal asymmetries.

Contribution

It introduces novel methods using transverse polarization to set bounds on new physics scales and anomalous couplings via azimuthal asymmetries in e+e- collisions.

Findings

Transverse polarization can constrain new (S,P) or T contact interactions to above 7 TeV.

Azimuthal asymmetries can probe anomalous gamma-gamma-Z couplings down to 10^{-2}.

Methods enhance sensitivity to CP-violating new physics in collider experiments.

Abstract

Transverse polarization (TP) can be used to study interference of (S,P) or T type couplings from new physics with the SM contribution. In e+e- -> t tbar, a CP-odd azimuthal asymmetry can constrain the scale Lambda of new (S,P) or T contact interactions to be higher than about 7 TeV for total c.m. energy of 500 GeV, integrated luminosity of 500 inverse fb, and assuming 80% e- and 60% e+ polarizations in opposite directions. In e+e- -> gamma Z without chirality violation, but with CP-violating anomalous gamma-gamma-Z couplings, an azimuthal asymmetry can probe the anomalous coupling down to about 10^{-2}.