Thursday, March 23, 2017, 16:00
WHGA Auditorium
Christian Smorra, RIKEN, Fundamental Symmetries Laboratory, Saitama, Japan
Abstract:
The Standard Model (SM) is the theory that describes Nature's particles
and fundamental interactions, although without gravitation. However,
this model is known to be incomplete which inspires various searches for
physics beyond. Among them are tests of charge, parity, time (CPT)
invariance that compare the fundamental properties of matter/antimatter
conjugates at lowest energy and with greatest precision.
The BASE collaboration [1] at the antiproton decelerator of CERN targets
high-precision comparisons of the fundamental properties of antiprotons
and protons, namely, charge-to-mass ratios and magnetic moments. To
perform these tests we have developed an advanced Penning trap
spectrometer which enabled the most precise measurement of the proton
magnetic moment with a fractional precision of 3.3 parts in a billion
[2], the most precise comparison of the proton-to-antiproton
charge-to-mass ratio, with a fractional precision of 69 parts in a
trillion [3], as well as the most precise measurement of the magnetic
moment of the antiproton [4]. Recent improvements in the stability of
the apparatus demonstrate the feasibility to improve this test by
another factor of at least 100. In the talk I will summarize our most
recent results and give an overview on the future perspectives of the
BASE physics program.
[1] C. Smorra et al., Eur. Phys. Journ. Spec. Top. 224, 16 (2015).
[2] A. Mooser et al., Nature 509, 596 (2014).
[3] S. Ulmer et al., Nature 524, 196 (2015).
[4] H. Nagahama et al., Nature Comms. 8, 14084 (2017).
[1] P.J. Mohr et al. (CODATA 2006), Rev. Mod. Phys. 80, 633 (2008)