סמינר ארצי בפיזיקה גרעינית

PROGRAM

14:30 - 14:45  Refreshments

14:45 - 15:45  "Taming The Pion Cloud of the Nucleon", Gerald Miller, University of Washington

Abstract:

The exchange of a pion between two nucleons has long been known to be  the  origin of the longest-ranged component of the force. The  existence of this  term means that a nucleon can exchange a pion with  itself, and therefore is  said to have a pion cloud. For example, a  proton can fluctuate into a  neutron and a positively charged pion. 

The result is that anti-down quarks  dominate the protons sea quark  distribution. However, the ability to make  quantitative calculations  has been hindered by ambiguities related to  short-distance aspects. 

We show how these ambiguities may be removed, so  that calculations  with reliably estimated uncertainties can be made. Thus,  the  existence of the pion cloud will be definitively tested in an upcoming  experiment

15:45 - 16:15  Coffee Break

16:15 - 17:15  "Report on MUSE", Guy Ron, HUJI

Abstract:

On sunday Jerry Miller will review the proton puzle status in the  Eisenberg  memorial colloquium at TAU. Guy will complete the picture  by a detailed  report on progress with MUSE, the leading experimental  effort to adress  thjis puzle at PSI.