[Theory-seminars] Theory Seminar. Monday, November 24. Ishara Fernando. Room L102. 1pm

[Cesar Fernandez-Ramirez]

Theory Center Seminar
Monday, November 24, 2014
1:00 p.m. 
CEBAF Center, Room L102

Speaker: Ishara Fernando (JLab & HU)

Title: Baryon spin-flavor structure from an analysis of lattice QCD results of
the baryon spectrum

Abstract: The known classification of excited baryons based on the dynamical
symmetry group SU(6)x O(3) can be understood in the framework of the 1/N_c
expansion [1]. The application to masses [2-5] based on the experimentally
determined masses can now be extended to the case of baryon masses
obtained in lattice QCD [6,7]. The work to be presented analyses the ground
state as well as the excited multiplets [70,1^-],[56,0^+] and [56,2^+].
Mass relations which are valid up to corrections 1/N_c^2, or
$\frac{1}{N_c}(m_s-m_{u,d})$,or $(m_s-m_{u,d})^2$ are tested and
conclusions on quark mass dependence of the effective mass operators and
minimal sets of effective mass operators are obtained.
[1] R.F. Dashen, E.E. Jenkins, and A.V. Manohar Phys.Rev.D51,3697(1995).
[2] C.E. Carlson, C.D. Carone, J.L. Goity, R.F. Lebed Phys.Rev.D59,114008(1999).
[3] J.L. Goity, C.L.Schat Phys.Rev.D66,114014 (1999).
[4] J.L. Goity, C.L.Schat, N.N.Scoccola Phys. Lett. B 564,83-89 (2003).
[5] C.E. Carlson, C.D. Carone Phys.Lett.B484,260-266 (2000).
[6] R.G. Edwards, J.J. Dudek, D.G. Richards, S.J. Wallace, Phys.Rev.D84, 074508 (2011).
[7] R.G. Edwards, N.Mathur, D.G. Richards, S.J. Wallace, Phys.Rev.D87, 054506 (2013).


-- 
César Fernández-Ramírez

Theory Center -- Jefferson Lab
12000 Jefferson Ave., Newport News, VA 23606, USA

Phone: (+1) 757-269-7844
Fax: (+1) 757-269-7002
E-mail: cesar at jlab.org