The heavy quarkonium spectrum from quenched lattice QCD
نویسنده
چکیده
We present results of simulations of the quenched quarkonium spectrum at two values of the lattice spacing and for quark masses around mc using the tadpole improved clover action. Attention is focussed on the lowest lying S and P states, and the triplet fine structure is obtained for the first time using a relativistic action. Typeset using REVTEX ∗Present Address: Department of Physics and Astronomy, University of Glasgow, Glasgow
منابع مشابه
Gluon excitations of the static quark potential and the hybrid quarkonium spectrum
A comprehensive determination of the rich, low-lying spectrum of gluonic excitations in the presence of a static quark-antiquark pair is presented. Our results are obtained from several simulations on anisotropic lattices using an improved action and a large set of gluonic operators. The hybrid quarkonium states are studied in the quenched approximation using the Born-Oppenheimer expansion and ...
متن کاملQuarkonium Decay Matrix Elements from Quenched Lattice QCD.
The factorization result of Bodwin, Braaten, and Lepage separates the contributions to the decay rates of heavy-quarkonium into long-distance and shortdistance factors. The short-distance coefficients are known from perturbation theory. We calculate the long-distance matrix elements for the lowest-lying Sand P-wave states of charmonium and bottomonium in quenched lattice QCD, using a nonrelativ...
متن کاملDetermining hybrid content of heavy quarkonia using lattice nonrelativistic QCD
Using lowest-order lattice NRQCD to create heavy meson propagators and applying the spin-dependent interaction, cB −g 2mq ~σ · ~ B, at varying intermediate time slices, we compute the off-diagonal matrix element of the Hamiltonian for the quarkonium-hybrid two-state system. Diagonalizing this two-state Hamiltonian, the admixture of hybrid (|QQ̄g〉) in the ground state is found. We present results...
متن کاملLattice Calculation of Quarkonium Decay Matrix Elements
We calculate the NRQCD matrix elements for the decays of the lowest-lying Sand P-wave states of charmonium and bottomonium in quenched lattice QCD. We also compute the one-loop relations between the lattice and continuum matrix elements. Heavy-quarkonium systems are nonrelativistic. In the CM frame, the average quark velocity v satisfies v 2 ≪ 1, where v 2 ≈ 0.3 for charmonium, and v 2 ≈ 0.1 fo...
متن کاملFine and Hyperfine Splittings of Charmonium and Bottomonium: An Improved Perturbative QCD Approach S. Recksiegel and Y. Sumino
We extend the formalism based on perturbative QCD that was developed in our previous work, and compute the hyperfine splittings of the bottomonium spectrum as well as the fine and hyperfine splittings of the charmonium spectrum. All the corrections up to O(αSm) are included in the computations. We find agreement (with respect to theoretical uncertainties) with the experimental values whenever a...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1999