Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 21: Precision Spectroscopy of Atoms and Ions II (with A)

Q 21.3: Talk

Tuesday, March 24, 2015, 11:45–12:00, M/HS1

The g-factor of the proton and progress towards the antiproton — •Andreas Mooser for the BASE collaboration — RIKEN Advanced Science Institute, Japan

By measuring the ratio of the Larmor and the cyclotron frequency of a single trapped proton with a fractional precision of 3.3 ppb we succeeded to perform the most precise and first direct high-precision measurement of the g-factor of the proton [1]. This was possible by recent advances in the quantum control of a single proton in a Penning trap [2]. As a next step, we currently pursue the application of our techniques towards a measurement of the g-factor of the antiproton [3], which will result in one of the most precise tests of CPT invariance on the baryionic sector. Pushing our limits even further, we are exploring experimental techniques, which will allow significantly accelerated measurement cycles using sophisticated Penning traps, detection systems and sympathetic laser cooling of single protons/antiprotons. This shall open up the possibility for a search of diurnal variations of the Larmor frequency caused by CPT- and Lorentz violating contributions beyond the Standard Model. In the talk our recent results on the measurement of the g-factor of the proton and an outlook regarding our future developments are given.
[1] A. Mooser et al., Nature 509, 596 (2014).
[2] A. Mooser et al., Phys. Rev. Lett. 110, 140405 (2013).
[3] C. Smorra et al., Hyperfine Interact. 228, 31 (2014).