Mass spectrum of N* and source optimization

Conference · Mon Mar 01 00:00:00 EST 2004 · Nuclear Physics B (Proc. Suppl.)

DOI:https://doi.org/10.1016/S0920-5632(03)02532-5· OSTI ID:915212

Basak, S; Edwards, R; Fiebig, R; Fleming, G; Heller, U M; Morningstar, C; Richards, D; Sato, I; Wallace, S

We have computed correlation functions for nucleons and extracted the masses for positive- and negative-parities. Use of group theory plays an important role in obtaining sources that have good overlap to higher spin states and minimum contamination from unwanted states. In the simulation three distinct sources and corresponding sinks that transform according to the $$G_1$$ irreducible representations are tested and used to form matrices of correlation functions. Diagonalizations give us clear mass splittings between low-lying states and excited states for both parities.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE - Office of Energy Research (ER)
• DOE Contract Number: AC05-84ER40150
• OSTI ID: 915212
• Report Number(s): JLAB-THY-03-45; DOE/ER/40150-4329; hep-lat/0309091; TRN: US0804915
• Journal Information: Nuclear Physics B (Proc. Suppl.), Vol. 129-130; Conference: 21st International Symposium on Lattice Field Theory (LATTICE 2003), Tsukuba, Ibaraki, Japan, 15-19 Jul 2003.
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CONTAMINATION
CORRELATION FUNCTIONS
EXCITED STATES
GROUP THEORY
IRREDUCIBLE REPRESENTATIONS
LATTICE FIELD THEORY
MATRICES
NUCLEONS
OPTIMIZATION
SIMULATION
SPIN