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FIZIKA B 13 (2004) 1, 271-278
 
MIXING ANGLES IN S11 AND D13 BARYONS
SIMON CAPSTICKa and WINSTON ROBERTSb
aDepartment of Physics, Florida State University,
Tallahassee, FL 32306-4350, USA
E-mail address: capstick@phy.fsu.edu
bDepartment of Physics, Old Dominion University, Norfolk, VA 23529 USA, and
Thomas Jefferson National Accelerator Facility, 12000 Jefferson Avenue, Newport News, VA
23606, USA
E-mail address: wroberts@odu.edu
Received 30 October 2003; Accepted 26 April 2004
Online 22 October 2004
The nature of the short-range interactions between quarks in baryons is of fundamental
importance to our understanding of the nature of nuclear matter in the soft-QCD regime.
Models of the structure of the negative-parity excited baryons in the S11 and D13
partial waves in Np scattering differ in their predictions for
the amount by which states of different quark spin but the same total spin are mixed. It
may be possible to distinguish among these models by an accurate determination of the
mixing angles in these states. A study of the dependence on these mixing angles of their
decay branching fractions to Np, Nh,
and L K, using a constituent quark model and the 3P0
decay model, allows conclusions to be drawn about the values of the mixing angles.
PACS numbers: 11.15.Pg, 11.15.Tk
UDC 539.12.1
Keywords: constituent quark model, 3P0 model, mixing angles
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