Exploring Excited Hadrons
نویسنده
چکیده
Progress in extracting the spectrum of excited hadron resonances is reviewed and the key issues and challenges in such computations are outlined. The importance of multi-hadron states as simulations are done with lighter pion masses is discussed, and the need for all-to-all quark propagators is emphasized.
منابع مشابه
Exploring Excited Hadrons in Lattice Qcd *
PACS numbers: 12.38.Gc, 11.15.Ha, 12.39.Mk Experiments show that many excited-state hadrons exist, and there are significant experimental efforts to map out the QCD resonance spectrum, such as Hall B and the proposed Hall D at Jefferson Lab, ELSA associated with the University of Bonn, COMPASS at CERN, PANDA at GSI, and BESIII in Beijing. Hence, there is a great need for ab initio determination...
متن کاملRestoration of chiral and U(1)A symmetries in excited hadrons.
1 Restoration of chiral and U (1) A symmetries in excited hadrons. The effective restoration of SU(2) L × SU(2) R and U(1) A chiral symmetries of QCD in excited hadrons is reviewed. While the low-lying hadron spectrum is mostly shaped by the spontaneous breaking of chiral symmetry, in the high-lying hadrons the role of the quark con-densate of the vacuum becomes negligible and the chiral symmet...
متن کاملHadrons of Arbitrary Spin and Heavy Quark Symmetry
We present a general construction of the spin content of the BetheSalpeter amplitudes (covariant wave functions) for heavy hadrons with arbitrary orbital excitations, using representations of L ⊗ O(3, 1). These wave functions incorporate the symmetries manifest in the heavy quark limit. In the baryonic sector we clearly differentiate between the Λ and Σ-type excited baryons. We then use the tra...
متن کاملExcited hadrons from improved interpolating fields
The calculation of quark propagators for Ginsparg-Wilson-type Dirac operators is costly and thus limited to a few different sources. We present a new approach for determining spatially optimized operators for lattice spectroscopy of excited hadrons. Jacobi smeared quark sources with different widths are combined to construct hadron operators with different spatial wave functions. We study the R...
متن کاملThe Many Uses of Excited Heavy Hadrons
The experimental and theoretical study of heavy hadrons typically focuses on the ground stateD and B mesons, and on the lightest baryons, Λc and Λb. This is hardly surprising, since these states are the most copiously produced, and the most long-lived, making detailed experiments possible. Nonetheless, these are but the lightest states in a tower of excitations. These excited states are also in...
متن کامل