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PRODID:UW-Madison-Physics-Events
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UID:UW-Physics-Event-1184
DTSTART:20080515T210000Z
DURATION:PT1H0M0S
DTSTAMP:20260506T210147Z
LAST-MODIFIED:20080514T175756Z
LOCATION:5280 Chamberlin
SUMMARY:Probing the TeV Scale with Parity-Violating Electron Scatterin
 g\, NPAC (Nuclear/Particle/Astro/Cosmo) Forum\, Krishna Kumar\, UMass
DESCRIPTION:The technique of parity-violating electron scattering\, in
 volving measurements of the asymmetry in the scattering of longitudina
 lly  polarized electrons off fixed targets\, has become increasingly p
 recise and broad in its scope over the past two decades. Such asymmetr
 ies are sensitive to weak neutral  current interactions (mediated by t
 he Z boson) between electrons and quarks\, or between two electrons\, 
 and are being used to investigate the strangeness content of the nucle
 on\, the neutron distribution in heavy nuclei and to probe for the lim
 its of the validity of the electroweak theory in a manner complementar
 y to direct searches for new physics at high energy scales at collider
 s.<br>
\nIn this talk\, we focus on the last of the abovementioned top
 ics. We begin by motivating and describing the results of the E158 exp
 eriment at the Stanford Linear Accelerator Center. We then discuss an 
 ongoing project and possible future complementary measurements that ca
 n be carried out at Jefferson Laboratory. The first experiment will be
  carried out with a 1 GeV electron beam. With the completion of the 12
  GeV upgrade\, further precise measurements become feasible\, in parit
 y-violating deep inelastic scattering and in electron-electron scatter
 ing. In particular\, the latter measurement could potentially lead to 
 a measurement of the mixing angle with precision equal to or better th
 an the two best collider measurements. In deep inelastic scattering\, 
 apart from testing the electroweak theory\, the measurements would pro
 vide new precision probes the valence quark structure of the nucleon. 
 Some aspects of the experimental challenges in carrying out this ambit
 ious program will also be discussed.
URL:https://www.physics.wisc.edu/events/?id=1184
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