Understanding the Hadron Spectrum in QCD
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
Lattice QCD offers a controlled computation approach to non-perturbative calculations in QCD. Using a large basis of composite QCD fields capable of interpolating mesons and baryons from the vacuum we have extracted excited state spectra for a range of flavor and spin-parity quantum numbers. I will discuss how the extracted meson spectrum can be broadly described in terms of $$q\bar{q}$$ bound states supplemented by a spectrum of mesons containing a gluonic excitation. These 'hybrid' mesons appear with both exotic and non-exotic $$J^{PC}$$ at a mass scale roughly 1.3 GeV above the lightest $$q\bar{q}$$ mesons. The degeneracy pattern of the observed states and the quark-gluon structure of those operators having strong overlap, strongly suggest that a chromomagnetic gluonic excitation is lightest within QCD. Computation of the baryon spectrum shows a comparable set of hybrid baryon states.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- DOE Contract Number:
- AC05-06OR23177
- OSTI ID:
- 1991888
- Report Number(s):
- JLAB-THY-13-1741; DOE/OR/23177-2737
- Resource Relation:
- Conference: ATHOS 2013, May 21 – 24, 2013, Kloster Seeon
- Country of Publication:
- United States
- Language:
- English
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