Conveners
M3-4 Cold and Trapped Atoms, and Tests of Fundamental Symmetries I (DNP/DTP/PPD/DAMOPC) | | Atomes froids et piégés, et tests de symétries fondamentales I (DPN/DPT/PPD/DPAMPC)
- Tim Friesen (TRIUMF (CA))
The QWeak collaboration completed a two year long, high precision measurement of the parity violating asymmetry in the elastic scattering of 1.1 GeV, longitudinally polarized electrons from protons. At low momentum transfer the measured asymmetry is directly related to the Weak charge of the proton $Q^p_W = 1 - 4 sin^2 \theta_W$. The Standard Model makes a firm prediction for the size of the...
The proton radius puzzle is the difference between the radius of the proton as measured with electron scattering and atomic hydrogen spectroscopy, and that measured in muonic hydrogen. In 2010, the CREMA Collaboration published their measurement of the proton radius $R_p=0.8409(4)$ fm, which was made by studying the Lamb shift in muonic hydrogen. Although ten times more precise than the...
The precise measurement of the 1S-2S transition in atomic hydrogen via 2-photon spectroscopy determines the value of the Rydberg and constrains our knowledge of the fundamental constants. The prospect of such a measurement in antihydrogen to test CPT motivated the construction two decades ago of the CERN AD and its initial program . The ALPHA collaboration has now measured this transition in...
The weight of antimatter is a crucial missing measurement in our picture of the natural world. It is important in two ways: 1. The predominance of matter created in the Big Bang demands some form of mismatch in properties between matter and antimatter. Many experiments have sensitively compared their charge, magnetic moment, nuclear bonding and decay behaviour, yet no significant mismatch has...
