Speaker
Dr
Makoto Fujiwara
(TRIUMF)
Description
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)
