Burch, Tommy and Toussaint, Doug (2003) Hybrid configuration content of heavy S-wave mesons. PHYSICAL REVIEW D, 68 (9): 094504. ISSN 0556-2821
Full text not available from this repository.Abstract
We use the nonrelativistic expansion of QCD (NRQCD) on the lattice to study the lowest hybrid configuration contribution to the ground state of heavy S-wave mesons. Using lowest-order lattice NRQCD to create the heavy-quark propagators, we form a basis of "unperturbed" S-wave and hybrid states. We then apply the lowest-order coupling of the quark spin and chromomagnetic field at an intermediate time slice to create "mixed" correlators between the S-wave and hybrid states. From the resulting amplitudes, we extract the off-diagonal element of our two-state Hamiltonian. Diagonalizing this Hamiltonian gives us the admixture of a hybrid configuration within the meson ground state. The present effort represents a continuation of previous work: the analysis has been extended to include lattices of varying spacings, source operators having better overlap with the ground states, and the pseudoscalar (along with the vector) channel. Results are presented for bottomonium (Y,eta(b)) using three different sets of quenched lattices. We also show results for charmonium (J/psi,eta(c)) from one lattice set, although we note that the nonrelativistic approximation is not expected to be very good in this case.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | LATTICE GAUGE-THEORIES; MIT BAG MODEL; NONRELATIVISTIC QCD; QUARK; ANNIHILATION; |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 27 Jul 2021 12:34 |
| Last Modified: | 27 Jul 2021 12:34 |
| URI: | https://pred.uni-regensburg.de/id/eprint/38492 |
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