Bulletin of the American Physical Society
APS April Meeting 2019
Volume 64, Number 3
Saturday–Tuesday, April 13–16, 2019; Denver, Colorado
Session Y04: Searching for AxionsInvited
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Sponsoring Units: DAP Chair: Guido Mueller, University of Florida Room: Sheraton Plaza F |
Tuesday, April 16, 2019 1:30PM - 2:06PM |
Y04.00001: First results from the Generation-2 Axion Dark Matter eXperiment (ADMX) Invited Speaker: Rakshya Khatiwada Very few mysteries in our current picture of the universe are more intriguing than the puzzle of dark matter. The QCD axion, a weakly interacting, sub-eV particle is a compelling cold dark matter candidate and was originally postulated as a solution to the strong CP problem. This talk will give an overview of direct detection axion searches along with a detailed discussion of the most sensitive experiment to probe the QCD axion to date, ADMX. In particular, ADMX has demonstrated recent success in reaching the so-called DFSZ sensitivity covering axion mass ranges from 2.66 to 3.31 μeV. These results have crucial implications for the future direction of on-going dark matter searches. |
Tuesday, April 16, 2019 2:06PM - 2:42PM |
Y04.00002: The International Axion Observatory (IAXO): The Next Generation of Axion Helioscopes Invited Speaker: Julia K. Vogel More than 80 years after the postulation of dark matter, its nature remains one of the fundamental questions in cosmology. Axions are currently one of the leading candidates for the hypothetical, non-baryonic dark matter that is expected to account for about 25% of the energy density of the Universe. Especially in the light of the Large Hadron Collider at CERN slowly closing in on weakly-interacting massive particle (WIMP) searches, axions and axion-like particles provide a viable alternative approach to solving the dark matter problem. The fact that makes them especially appealing is that they were initially introduced to solve a long-standing problem in quantum chromodynamics rather than as an ad hoc solution for dark matter. Helioscopes are a type of axion experiment searching for axions produced in the core of the Sun via the Primakoff effect. The International Axion Observatory (IAXO) is a next generation axion helioscope aiming at a sensitivity to the axion-photon coupling of 1 - 1.5 orders of magnitude beyond the current most sensitive axion helioscope which is the CERN Axion Solar Telescope (CAST). IAXO will be able to challenge the stringent bounds from supernova SN1987A and test the axion interpretation of anomalous white-dwarf cooling. Beyond standard axions, this new experiment will also be able to search for a large variety of ALPs and other novel excitations at the low-energy frontier of elementary particle physics. BabyIAXO is proposed as a small pilot experiment increasing the sensitivity to axion-photon couplings down to a few 10-11 GeV-1 and thus delivering significant physics results while demonstrating the feasibility of the full-scale IAXO experiment. Here we introduce the IAXO and BabyIAXO experiments, report on the current status of both and outline the expected IAXO science reach. |
Tuesday, April 16, 2019 2:42PM - 3:18PM |
Y04.00003: ALPSII: Using Long Baseline Cavities to Probe the Hidden Sector Invited Speaker: Aaron D Spector The Any Light Particle Search II (ALPS II) is an experiment taking place at DESY in Hamburg, Germany, that will attempt to measure ‘axion-like’ particles for the first time. These particles share similar characteristics with the axion and up to now remain unobserved in the hidden sector as they are very weakly interacting. Some of their other characteristics include having a low mass (< 1eV) and coupling to photons in the presence of magnetic fields. |
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