منابع مشابه
The scalar glueball spectrum
We discuss scenarios for scalar glueballs using arguments based on sum rules, spectral decomposition, the 1 Nc approximation, the scales of the strong interaction and the topology of the flux tubes. We analyze the phenomenological support of those scenarios and their observational implications. Our investigations hint a rich low lying glueball spectrum. Pacs: 12.38-t, 12.38.Aw,14.70.-e, 14.70.-j
متن کاملThe Glueball Spectrum
Mass ratios of glueballs predicted by the latest Lattice QCD calculations in the quenched approximation agree well with four prime experimental candidates. 1 Now at the Institute for High Energy Physics, Beijing 100039, China Preprint submitted to Elsevier Preprint 1 February 2008 There is an uncertainty of ±10% in the overall mass scale of present Lattice QCD predictions for glueballs, arising...
متن کاملImproving the low-lying spectrum of the overlap kernel
Unfortunately, the matrix sign function ǫ(H) is difficult to evaluate and is typically approximated by a sum over poles [1] which can be evaluated using a multi-shift conjugate gradient (CG) solver [2]. This is an iterative approximation where the number of iterations for a given accuracy depends upon the condition number of the kernel, κ(H) = |λmax/λmin|. Usually the Hermitian Wilson-Dirac ope...
متن کاملLow lying qqqqq̄ states in the baryon spectrum
The coupling to light mesons leads to large widths and shifts of the energy of the excited states in the baryon spectrum from the predictions of the constituent quark model with three valence quarks. This coupling may be modelled by admixtures of sea-quark qqq(qq̄) configurations in the resonances. Using the same schematic flavor and spin dependent interaction model, which reproduces the low lyi...
متن کاملBeyond mean - field description of the low - lying spectrum of
Starting from constrained Skyrme-mean-field calculations, the low-energy excita-tion spectrum of 16 O is calculated by configuration mixing of particle-number and angular-momentum projected mean-field states in the framework of the Generator Coordinate Method. Without any adjustable parameters, this approach gives a very good description of those states and their transition moments that can be ...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Physics Letters B
سال: 2003
ISSN: 0370-2693
DOI: 10.1016/j.physletb.2003.10.008