Limits on CPT violation from solar neutrinos

TL;DR

This paper uses solar neutrino data to set stringent new limits on CPT violation, significantly improving previous bounds by analyzing neutrino-to-antineutrino transitions over long distances.

Contribution

It provides the first comprehensive constraints on CPT-violating coefficients using solar neutrino observations, surpassing prior limits by large factors.

Findings

CPT violation constraints improved by factors of 10^3 to 10^11.

Upper bounds on neutrino-to-antineutrino transition probability established.

Long-distance solar neutrino propagation enhances sensitivity to CPT violation.

Abstract

Violations of CPT invariance can induce neutrino-to-antineutrino transitions. We study this effect for solar neutrinos and use the upper bound on the solar neutrino-to-antineutrino transition probability from the KamLAND experiment to constrain CPT-symmetry-violating coefficients of the general Standard-Model Extension. The long propagation distance from the Sun to the Earth allows us to improve existing limits by factors ranging from about a thousand to $10^{11}$.