$\gamma-$ray line generated by the Green-Schwarz mechanism

TL;DR

This paper explores a $U_X(1)$ extension of the Standard Model with a Green-Schwarz anomaly cancellation mechanism, predicting gamma-ray signatures detectable by FERMI/GLAST, potentially probing TeV-scale new physics.

Contribution

It introduces a novel $U_X(1)$ model with anomaly cancellation via the Green-Schwarz mechanism and analyzes its gamma-ray signatures for future telescope detection.

Findings

FERMI/GLAST can test a 1 TeV BSM scale after 5 years

Gamma-ray signatures provide a complementary probe to LHC searches

Model remains consistent with current experimental constraints

Abstract

We study the phenomenology of a $U_X(1)$ extension of the Standard Model where the SM particles are not charged under the new abelian group. The Green-Schwarz mechanism insures that the model is anomaly free. The erstwhile invisible dark gauge field $X$, even if produced with difficulty at the LHC has however a clear signature in gamma-ray telescopes. We investigate what BSM scale (which can be interpreted as a low-energy string scale) would be reachable by the FERMI/GLAST telescope after 5 years of running and show that a 1 TeV scale can be testable, which is highly competitive with the LHC.