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FIZIKA B 13 (2004) 2, 501-506
 
PRELIMINARY DIFFERENTIAL CROSS SECTIONS OF THE CHARGE-EXCHANGE REACTION
DARKO MEKTEROVIĆ and IVAN SUPEK
Ruđer Bošković Institute, HR-10002 Zagreb, Croatia
FOR THE CRYSTAL BALL COLLABORATION
Received 12 December 2003; Accepted 26 April 2004
Online 14 November 2004
The Crystal Ball Collaboration measured differential cross sections for pion-nucleon
charge-exchange reaction at seven different pion momenta in the momentum region between
105 MeV/c and 180 MeV/c. When analyzed, these data will represent the highest-precision
differential cross sections in this energy region. They will be essential for providing
the necessary constrains on partial-wave analysis so that pion-nucleon sigma term can be
extracted more reliably, and also provide a determination of the mass difference of the up
and down quarks. Preliminary results for these differential cross sections are presented.
PACS numbers: 13.75.Gx
UDC 539.12
Keywords: differential cross sections for pion-nucleon charge-exchange, sigma term,
quarks
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