8-13 September 2013
Asilomar, California
US/Pacific timezone

Recent constraints on axion-photon and axion-electron couplings with the CAST experiment

12 Sep 2013, 17:20
20m
Asilomar, California

Asilomar, California

Asilomar Conference Grounds, 800 Asilomar Avenue, Pacific Grove, CA 93950-3704
Oral Dark Matter Dark Matter VIII

Speaker

Jaime Ruz (CERN)

Description

"Axions are DM candidates that can be produced in the solar core. The CERN Axion Solar Telescope (CAST) is a helioscope looking for axions coming from the solar core to Earth. The experiment, located at Geneva (Switzerland) is able to follow the Sun during sunrise and sunset. Four x-ray detectors are mounted on both ends of the magnet waiting for a photon from axion-to-photon conversion due to the Primakoff effect. With the completion of Phases I and II, CAST has been able to scan for axions with masses up to 1.16eV. We will present recent constraints on the axion-photon coupling. Recently, non-minimal axion models are also receiving increasing attention. For instance, WD cooling hypothesis relies solely on the axion-electron coupling. Non-hadronic axion models, have a tree-level axion-electron interaction: the Sun produces a strong axion flux by bremsstrahlung, Compton scattering, and axio- recombination, the “BCA processes.” Based on a new calculation of this flux, including for the first time axio-recombination, we will also present limits on the axion-electron Yukawa coupling gae and axion-photon interaction strength gaγ using the CAST phase-I data (vacuum phase)."

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