Exotic mesons in quenched lattice QCD

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dc.creatorMILC collaboration
dc.creatorBernard, Claude
dc.creatorDeGrand, Thomas A.
dc.creatorDeTar, Carleton
dc.creatorGottlieb, Steven
dc.creatorHeller, Urs M.
dc.creatorHetrick, James E.
dc.creatorMcNeile, Craig
dc.creatorRummukainen, Kari
dc.creatorSugar, Bob
dc.creatorToussaint, Doug
dc.creatorWingate, Matthew
dc.date1997-07-11
dc.date1997-07-14
dc.date.accessioned2026-07-07T11:34:47Z
dc.date.available2026-07-07T11:34:47Z
dc.descriptionSince gluons in QCD are interacting fundamental constituents just as quarks are, we expect that in addition to mesons made from a quark and an antiquark, there should also be glueballs and hybrids (bound states of quarks, antiquarks and gluons). In general, these states would mix strongly with the conventional q-bar-q mesons. However, they can also have exotic quantum numbers inaccessible to q-bar-q mesons. Confirmation of such states would give information on the role of "dynamical" color in low energy QCD. In the quenched approximation we present a lattice calculation of the masses of mesons with exotic quantum numbers. These hybrid mesons can mix with four quark (q-bar-q-bar-q-q) states. The quenched approximation partially suppresses this mixing. Nonetheless, our hybrid interpolating fields also couple to four quark states. Using a four quark source operator, we demonstrate this mixing for the 1-+ meson. Using the conventional Wilson quark action, we calculate both at reasonably light quark masses, intending to extrapolate to small quark mass, and near the charmed quark mass, where we calculate the masses of some c-bar-c-g hybrid mesons. The hybrid meson masses are large --- over 4 GeV for charmonium and more than twice the vector meson mass at our smallest quark mass, which is near the strange quark mass.
dc.description30 pages, LaTeX, PostScript figures included, 2 typos fixed in table 6
dc.identifierhttps://arxiv.org/abs/hep-lat/9707008
dc.identifierhttp://arxiv.org/abs/hep-lat/9707008
dc.identifierPhys.Rev.D56:7039-7051,1997
dc.identifierdoi:10.1103/PhysRevD.56.7039
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/198376
dc.subjectHigh Energy Physics - Lattice
dc.subjectHigh Energy Physics - Phenomenology
dc.titleExotic mesons in quenched lattice QCD
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