scholarly journals Qweak: A Precision Measurement of the Proton’s Weak Charge

2004 ◽  
Author(s):  
Gregory S. Mitchell
Keyword(s):  
Precision Measurement ◽  
Weak Charge

scholarly journals ATOMIC PARITY VIOLATION: PRINCIPLES, RECENT RESULTS, PRESENT MOTIVATIONS

2005 ◽  
Vol 20 (06) ◽  
pp. 375-389 ◽  
Author(s):  
J. GUÉNA ◽  
M. LINTZ ◽  
M.-A. BOUCHIAT
Keyword(s):  
Parity Violation ◽  
Precision Measurement ◽  
Calibration Procedure ◽  
New Physics ◽  
Stimulated Emission ◽  
Atomic Parity Violation ◽  
Weak Charge ◽  
The Status ◽  
Left Right Asymmetry

We review the progress made in the determination of the weak charge, QW, of the cesium nucleus which raises the status of Atomic Parity Violation measurements to that of a precision electroweak test. Not only is it necessary to have a precision measurement of the electroweak asymmetry in the highly forbidden 6S–7S transition, but one also needs a precise calibration procedure. The 1999 precision measurement by the Boulder group implied a 2.5 σ deviation of QW from the theoretical prediction. This triggered many particle physicist suggestions as well as examination by atomic theoretical physicists of several sources of corrections. After about three years, the disagreement was removed without appealing to "New Physics". Concurrently, an original experimental approach was developed in our group for more than a decade. It is based on detection by stimulated emission with amplification of the left–right asymmetry. We present our decisive, recent progress together with our latest results. We emphasize the important impact for electroweak theory, of future measurements in cesium possibly pushed to the 0.1% level. Other possible approaches are currently explored in several atoms.

High precision measurement of the SOS surface thickness in the rough phase

1991 ◽  
Vol 1 (12) ◽  
pp. 1669-1673 ◽  
Author(s):  
Hans Gerd Evertz ◽  
Martin Hasenbusch ◽  
Mihail Marcu ◽  
Klaus Pinn ◽  
Sorin Solomon
Keyword(s):  
High Precision ◽  
Precision Measurement ◽  
High Precision Measurement ◽  
Surface Thickness
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