Glueballs and the superfluid phase of Two-Color QCD
| Autor: | M. L. Paciello, Silvano Petrarca, B. Taglienti, Maria Paola Lombardo |
|---|---|
| Rok vydání: | 2008 |
| Předmět: |
Quantum chromodynamics
Physics Quark Particle physics Physics and Astronomy (miscellaneous) Glueball High Energy Physics::Lattice High Energy Physics - Lattice (hep-lat) FOS: Physical sciences Propagator Fermion Superfluidity High Energy Physics - Lattice Amplitude Lattice (order) Engineering (miscellaneous) |
| Zdroj: | The European Physical Journal C. 58:69-81 |
| ISSN: | 1434-6052 1434-6044 |
| Popis: | We present the first results on scalar glueballs in cold, dense matter using lattice simulations of two color QCD. The simulations are carried out on a $6^3 \times 12$ lattice and use a standard hybrid molecular dynamics algorithm for staggered fermions for two values of quark mass. The glueball correlators are evaluated via a multi-step smearing procedure. The amplitude of the glueball correlator peaks in correspondence with the zero temperature chiral transition, $\mu_c = m_\pi/2$, and the propagators change in a significant way in the superfluid phase, while the Polyakov loop is mearly insensitive to the transition. Standard analysis suggest that lowest mass in the $0^{++}$ gluonic channel decreases in the superfluid phase, but these observations need to be confirmed on larger and more elongated lattices These results indicate that a nonzero density induces nontrivial modifications of the gluonic medium. Comment: 26 pages, 13 figures; discussions and one figure added; to appear in EPJC |
| Databáze: | OpenAIRE |
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