1 Spectrum of the excited Nucleon and Delta baryons in a relativistic chiral quark model E.M. Tursunov, INP, Tashkent with S. Krewald, FZ, Juelich J. Phys. G:Nucl. Part. Phys., 31 (2005) 617-629. J. Phys. G:Nucl. Part. Phys., 36 (2009) 095006. J. Phys. G: Nuc. Part . Phys., 37(2010) 105013
44
Embed
1 Spectrum of the excited Nucleon and Delta baryons in a relativistic chiral quark model E.M. Tursunov, INP, Tashkent with S. Krewald, FZ, Juelich J. Phys.
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Spectrum of the excited Nucleon and Delta baryons in a relativistic chiral
quark model
E.M. Tursunov, INP, Tashkent
with S. Krewald, FZ, Juelich
J. Phys. G:Nucl. Part. Phys., 31 (2005) 617-629.
J. Phys. G:Nucl. Part. Phys., 36 (2009) 095006.
J. Phys. G: Nuc. Part . Phys., 37(2010) 105013 arXiv (hep-ph): 1103.3661 (2011) arXiv (hep-ph): 1204.0412 (2012)
Outline
2
• Motivation
• Chiral quark potential model (ChQPM)
• Selection rules for quantum numbers: connection with the strong decay of excited baryons with orbital structure (1S)2(nlj)
• Center of mass correction for the zero-order energy values of the N and Delta states • Numerical estimation of the ground and excited
Nucleon and Delta mass spectrum within ChQPM
• Conclusions
Motivation
3
Ciral Quark Models have been extensively used to study the structure of the ground state N(939)
S. Theberge, A.W. Thomas and G.A. Miller, Phys. Rev. D22, 2838 (1980);A.W. Thomas, S. Theberge and G.A. Miller, Phys. Rev. D24, 216 (1981).
E. Oset, R. Tegen, W. Weise Nucl. Phys. A426, 456 (1984)Th. Gutsche & D. Robson . Phys.Lett. B229, 333 (1989)
Excited baryon spectroscopy: problems within Constituent Quark Models
4
• relativistic effects v ≈ c; • the “missing resonances” problem • a number of fitting parameters (5-10) • what is the most important exchange mechanism
between quarks: one gluon exchange ? (Isgur & Karl, Phys. Let. B72, 109