Exotic mesons in quenched lattice QCD
- Department of Physics, Washington University, St. Louis, Missouri 63130 (United States)
- Physics Department, University of Colorado, Boulder, Colorado 80309 (United States)
- Physics Department, University of Utah, Salt Lake City, Utah 84112 (United States)
- Department of Physics, Indiana University, Bloomington, Indiana 47405 (United States)
- SCRI, Florida State University, Tallahassee, Florida 32306-4130 (United States)
- Universitaet Bielefeld, Fakultaet fuer Physik, Postfach 100131, D-33501 Bielefeld (Germany)
- Department of Physics, University of California, Santa Barbara, California 93106 (United States)
- Department of Physics, University of Arizona, Tucson, Arizona 85721 (United States)
Since 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 {bar q}q mesons. However, they can also have exotic quantum numbers inaccessible to {bar q}q mesons. Confirmation of such states would give information on the role of {open_quotes}dynamical{close_quotes} 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 ({bar q}{bar q}qq) 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{sup {minus}+} 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 {bar c}cg hybrid mesons. The hybrid meson masses are large {emdash} 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. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 553167
- Journal Information:
- Physical Review, D, Vol. 56, Issue 11; Other Information: PBD: Dec 1997
- Country of Publication:
- United States
- Language:
- English
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