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DTSTAMP:20260416T042023
DTSTART:20131004T100000
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TRANSP:OPAQUE
DTEND:20131004T110000
URL:https://murmitoyen.com/events/vanille/udem/detail/265516
LOCATION:Université de Montréal - Pavillon Claire-McNicoll\, 2900\, chemi
 n de la Tour\, Montréal\, QC\, Canada\, H3T 1J6
SUMMARY:The charge radius of the proton
DESCRIPTION:Gil Paz Wayne State University\, DetroitRecently\, the charge r
 adius of the proton was extracted for the first time from the Lamb shift i
 n muonic hydrogen [1]. Very surprisingly\, the value is more than five sta
 ndard deviations away from the regular hydrogen result. The extraction of 
 the proton radius from muonic hydrogen depends on a theoretical input. In 
 this talk I will describe the study\, done together with Richard J. Hill\,
  of the hadronic uncertainty in the theoretical prediction\, using the too
 l of an effective field theory\, namely NRQED [2]. I will also describe th
 e model-independent extraction of the charge radius from electron-proton s
 cattering. We have shown that previous extractions\, spanning a period of 
 over 40 years\, have underestimated their error sometimes by a factor of t
 wo or more [3].  [1] R. Pohl et al.\, Nature 466\, 213 (2010)\, A. Antogni
 ni et al.\, Science 339\, 417 (2013) [2] R.J. Hill\, G. Paz\, PRL 107\, 16
 0402 (2011) [3] R.J. Hill\, G. Paz\, PRD 82\, 113005 (2010)
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