Physics of fundamental Symmetries and Interactions - PSI2010

Session

Session We - 2

3 - 2

13 Oct 2010, 10:50

Main Auditorium (WHGA/001) (PSI)

139. From muonic hydrogen to muonic helium

Aldo Antognini

13/10/2010, 10:50

Oral

The present discrepancy concerning the proton radius values extracted from hydrogen spectroscopy, scattering experiments and muonic hydrogen is discussed. Recent arguments about proton shape and new scattering data are presented. In addition we will conclude proposing a new experiment which could help to understand the discrepancy: the Lamb shift in muonic helium.

5. The Lamb shift in muonic hydrogen

Aldo Antognini

13/10/2010, 11:20

Precision measurements of fundamental constants

Oral

The charge radius r_p of the proton has so far been known from electron-proton scattering with an astonishingly low precision of about 2%. The CODATA value of r_p with an uncertainty of 1% is mainly determined from hydrogen (H) spectroscopy data and bound-state QED calculations. The less accurate H-independent value from e-p-scattering limits the test of bound-state QED in hydrogen, as...

55. Pionic Hydrogen

Detlev Gotta (Forschungszentrum Jülich)

13/10/2010, 11:40

Exotic atoms and molecules

Oral

K X-rays from pionic hydrogen and deuterium as well as muonic hydrogen have been measured using a high-resolution crystal spectrometer at the E5 beam line of PSI. From the ground-state level shifts and broadenings of the hydrogen isotopes, caused by the strong interaction, low-energy parameters of QCD become accessible as are the pion-nucleon scattering lengths and the threshold production...

23. Measurement of the ground-state hyperfine splitting of antihydrogen

Dr Bertalan Juhasz (Stefan Meyer Institute for Subatomic Physics, Vienna, Austria)

13/10/2010, 12:00

Low energy precision tests of the Standard Model

Oral

The hydrogen atom is one of the most extensively studied atomic systems, and its ground state hyperfine splitting (GS-HFS) at 1.42 GHz has been measured with an extremely high precision of 10^-12. Therefore the antimatter counterpart of hydrogen, the antihydrogen atom, consisting of an antiproton and a positron, is an ideal laboratory for studying the CPT symmetry. Kostelecky and his...

59. Towards antihydrogen spectroscopy at ALPHA

Dr Arthur Olin (TRIUMF/UVic)

13/10/2010, 12:20

Exotic atoms and molecules

Oral

Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. We will describe the progress made in the production of a trapped sample of antihydrogen atoms at CERN's Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and...