Oct 16 – 20, 2016
Europe/Zurich timezone

Entering the Precision Era: Antihydrogen Symmetry Tests with ALPHA

Oct 19, 2016, 9:30 AM
Oral Fundamental physics and precision experiments with muons, pions, neutrons, antiprotons, and other particles We - 1


Dr Makoto Fujiwara (TRIUMF)


The ALPHA experiment at CERN aims to address some of the most fundamental issues in modern physics using trapped antihydrogen atoms. Following our successful trapping on antihydrogen [1,2], ALPHA has been performing measurements on the properties of antihydrogen atoms, including a proof of principle of a hyperfine splitting measurement [3], and a search for an anomalous very weak force [4]. Recently, we reported a new limit on antihydrogen charge neutrality [5,6] at the 10^-9 level, which in turn provides a limit on electron-to-positon charge ratio at the similar precision, improving the Particle Data Group limit by a factor of 40. Thus, antihydrogen measurements are entering a precision era. Currently, we are aiming at performing the first laser spectroscopy measurement on antihydrogen, and at the same time, constructing a new device ALPHA-g for a measurement of the gravitational force on antihydrogen to test Einstein’s Equivalence Principle. In this talk, I will give the current status and the future prospects on fundamental studies with ALPHA. References: [1] G.B. Andresen et al., Nature 468, 673 (2010). [2] G.B. Andresen at al., Nature Physics 7, 558 (2011). [3] C. Amole et al., Nature 483, 439 (2012). [4] C. Amole et al., Nature Comm. 4, 1785 (2013). [5] C. Amole et al., Nature Comm. 5, 3955 (2014). [6] M. Ahmadi et al., Nature 529, 373 (2016).

Primary author

Dr Makoto Fujiwara (TRIUMF)

Presentation materials