Abstract
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 q̄q mesons. However, they can also have exotic quantum numbers inaccessible to q̄q 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 (q̄q̄qq) 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 ccg 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.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 7039-7051 |
| Number of pages | 13 |
| Journal | Physical Review D - Particles, Fields, Gravitation and Cosmology |
| Volume | 56 |
| Issue number | 11 |
| State | Published - Dec 1 1997 |
Fingerprint
ASJC Scopus subject areas
- Mathematical Physics
- Physics and Astronomy(all)
- Nuclear and High Energy Physics
Cite this
Exotic mesons in quenched lattice QCD. / Bernard, Claude; Hetrick, James E.; DeGrand, Thomas A.; Wingate, Matthew; DeTar, Carleton; McNeile, Craig; Gottlieb, Steven; Heller, Urs M.; Rummukainen, Kari; Sugar, Bob; Toussaint, William D.
In: Physical Review D - Particles, Fields, Gravitation and Cosmology, Vol. 56, No. 11, 01.12.1997, p. 7039-7051.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Exotic mesons in quenched lattice QCD
AU - Bernard, Claude
AU - Hetrick, James E.
AU - DeGrand, Thomas A.
AU - Wingate, Matthew
AU - DeTar, Carleton
AU - McNeile, Craig
AU - Gottlieb, Steven
AU - Heller, Urs M.
AU - Rummukainen, Kari
AU - Sugar, Bob
AU - Toussaint, William D
PY - 1997/12/1
Y1 - 1997/12/1
N2 - 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 q̄q mesons. However, they can also have exotic quantum numbers inaccessible to q̄q 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 (q̄q̄qq) 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 ccg 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.
AB - 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 q̄q mesons. However, they can also have exotic quantum numbers inaccessible to q̄q 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 (q̄q̄qq) 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 ccg 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.
UR - http://www.scopus.com/inward/record.url?scp=0642304546&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0642304546&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0642304546
VL - 56
SP - 7039
EP - 7051
JO - Physical review D: Particles and fields
JF - Physical review D: Particles and fields
SN - 0556-2821
IS - 11
ER -