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SUMMARY:Bounds on New Physics from Parity Violation in Atomic Cesium
DTSTART;VALUE=DATE-TIME:19990721T120000Z
DTEND;VALUE=DATE-TIME:19990721T121500Z
DTSTAMP;VALUE=DATE-TIME:20130619T071653Z
UID:indico-event-a034731@cern.ch
DESCRIPTION:Assuming the latest experimental determination of the weak cha
 rge of atomic cesium we analyze its implications for possible new physics.
  We notice that the data would imply  positive upper and lower bounds on t
 he new physics contribution to the weak charge\, dNQW. The required new ph
 ysics should be of a type not severely constrained by the high energy prec
 ision data. A simplest possibility would be new neutral vector bosons almo
 st unmixed to the Z and with sizeable couplings to fermions. The lower pos
 itive bound would however forbid zero or negative dNQW and exclude not onl
 y the standard model but also models with sequential Z’in particular simp
 le-minded towers of Z-like excitations from extra-dimensions. The bound wo
 uld also imply an upper limit on the Z’ mass within the models allowed. C
 onclusions are also derived for models of four-fermion contact interaction
 s.\n\nhttp://indico.cern.ch/conferenceDisplay.py?confId=a034731
LOCATION:CERN TH Auditorium
URL:http://indico.cern.ch/conferenceDisplay.py?confId=a034731
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