[Triumf-seminars] TRIUMF Special Seminar today at 14:00

[TRIUMF Seminars]

Date/Time: Tue 2019-05-28 at 14:00

Location:  Auditorium          

Speaker:   Takashi Higuchi (RCNP Osaka)

Title:     High-precision comparisons of the fundamental properties between the proton and the antiproton

Abstract: The Baryon Antibaryon Symmetry Experiment (BASE) [1] at CERN's antiproton decelerator facility conducts stringent tests of CPT (Charge Parity and Time) symmetry by comparisons of the fundamental properties between the proton and the antiproton, such as their charge-to-mass ratios [2] and the magnetic moments [3,4,5,6]. Single-particle measurements with a multi-Penning trap system have enabled high-precision comparisons of these physical quantities [1].

Recently, BASE performed proton-antiproton comparison of charge-to-mass ratios with a fractional precision of 69 p.p.t. [2]. We also reported measurements of the magnetic moments of the antiproton and the proton with fractional precisions of 1.5 p.p.b [5], and 0.3 p.p.b [6], respectively. All these results were consistent with CPT symmetry. Beside the above measurements, we also provided an improved limit on the directly-measured antiproton lifetime by accumulation of antiprotons in a trap dedicated to antiproton storage [7].

In the seminar, I will explain the principles and methods of the experiments, and give an overview of the achievements, with a focus on the charge-to-mass ratio comparison and developmental works performed thereafter for a further improvement of the measurement precision [8].

[1] C. Smorra et al., Eur. Phys. J. S. T. 224(16) 3055 (2015).
[2] S. Ulmer et al., Nature 524, 196 (2015).
[3] A. Mooser et al., Nature 509, 596 (2014).
[4] H. Nagahama et al., Nat. Commun. 8, 14084(2017).
[5] C. Smorra et al., Nature 550, 371 (2017).
[6] G. Schneider et al., Science 358, 1081 (2017).
[7] S. Sellner et al., New. J. Phys. 19, 083023 (2017).
[8] T. Higuchi et al., Hyp. Int. 239, 27 (2018).



______________________________

General TRIUMF seminar information available at http://www.triumf.ca/home/upcoming-events/about-seminars-lectures