Innovative Polarimetry for High$-$energy Cosmic $\gamma$ and $e^{+}/e^{-}$ Induced by Vector Photo$-$productionn

TL;DR

This paper introduces a novel vector meson photo-production polarimetry technique to measure the complete polarization states of high-energy cosmic photons and leptons, enabling new insights into fundamental physics.

Contribution

It presents an innovative method for measuring the polarization of GeV cosmic photons and leptons using vector meson photo-production, with a partially model-independent approach based on generalized factorization.

Findings

Enables measurement of circular and linear polarization of GeV gamma rays.

First-time measurement of polarization of GeV cosmic electrons and positrons.

Provides a new tool to explore beyond Standard Model physics in cosmology.

Abstract

In this paper, we explore the possibility of measuring the complete polarizations of cosmic photons $\gamma$ and the polarizations of cosmic electrons $e^{-}$ and positrons $e^{+}$. Our innovative Vector Meson Photo-production induced polarimetry enables people to measure the circular plarization compoent of a $GeV$ $\gamma$ and to improve its linear polarization measurement, and thus enables people to measure the polarization of $GeV$ $e^{+}/e^{-}$ for the first time. We calculate the production process of $\pi^{+}\pi^{-}$ by a generally polarized photon near nucleon's field in a generalized VPD-SDMEs Factorization with the fitted experimental data, so that it's partially model-independent. We also propose the observables and approach to measure their polarizations based on our calculations. Our new polarimetry of high-energy cosmic $\gamma,e^{+},e^{-}$ will open a new window to reveal the mysteries and solve the puzzles of BSM new physics in particle physics and cosmology.