Heidelberg 2015 – scientific programme

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A: Fachverband Atomphysik

A 39: Precision spectroscopy of atoms and ions IV (with Q)

A 39.2: Talk

Friday, March 27, 2015, 11:15–11:30, C/kHS

BASE: Topics in Data Analysis — •Kurt Franke for the BASE collaboration — Max-Planck-Institut für Kernphysik, Heidelberg, Germany — Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany

BASE (Baryon-Antibaryon Symmetry Experiment) is a new experiment at CERN with the purpose of making high-precision comparison measurements of the properties of protons and antiprotons. As such, BASE functions as a sensitive test of CPT invariance in the baryon sector. This talk will cover several important data analysis aspects relevant to BASE and similar Penning-trap experiments. A single trapped particle in thermal equilibrium with a detection system creates a narrow notch or “dip” in the thermal noise of the detector at the eigenfrequency of the particle. First, these so-called “dip” measurement will be analyzed, and an expression for the expected accuracy and optimal FFT-window function for this measurement technique will be given. Next, a Bayesian recursive algorithm for calculating probabilities for spin states will be presented. Finally, the parameter selection algorithm for analyzing Larmor resonances will be presented. These analysis techniques have been applied in the most precise measurement of the proton’s magnetic moment [Nature 509, 596–599 (2014)].