Special Research Centre for the Subatomic Structure of Matter
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The central mission of the Centre is to carry out research activities in the forefront of the fields of theoretical nuclear and particle physics with special emphasis on the strong interactions and their importance in determining the nature of matter.
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CSSM,
Rm. 126, Lvl 1 Physics Building,
University of Adelaide,
SA 5005, Australia
Telephone: +61-8-83133533
Fax: +61-8-83133551
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Browsing Special Research Centre for the Subatomic Structure of Matter by Author "Alexandru, Andrei"
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Item Metadata only Charmonium spectrum from quenched QCD with overlap fermions(Elsevier Science BV, 2005) Tamhankar, Sonali; Alexandru, Andrei; Chen, Yanbei; Dong, Shao-Jing; Draper, Terrence; Horvath, Ivan; Lee, Frank X.; Liu, K. F.; Mathur, Nilmani; Zhang, Jian-Bo; Centre for the Sub-Atomic Structure of MatterItem Metadata only Improved measure of local chirality(Elsevier Science BV, 2005) Draper, Terrence; Alexandru, Andrei; Chen, Ying; Dong, Shao-Jing; Horvath, Ivan; Lee, Frank X.; Mathur, Nilmani; Thacker, Harry B.; Tamhankar, Sonali; Zhang, Jian-Bo; Centre for the Sub-Atomic Structure of MatterItem Metadata only Inherently global nature of topological charge fluctuations in QCD(Elsevier Science BV, 2005) Horvath, Ivan; Alexandru, Andrei; Zhang, Jian-Bo; Chen, Yanbei; Dong, Shao-Jing; Draper, Terrence; Lee, Frank X.; Liu, K. F.; Mathur, Nilmani; Tamhankar, Sonali; Thacker, Harry B.; Centre for the Sub-Atomic Structure of MatterItem Metadata only Locality and scaling of quenched overlap fermions(Scuola Internazionale Superiore di Studi Avanzati, 2005) Draper, Terrence; Mathur, Nilmani; Zhang, Jian-Bo; Alexandru, Andrei; Chen, Yanbei; Dong, Shao-Jing; Horvath, Ivan; Lee, Frank X.; Tamhankar, Sonali; International Symposium on Lattice Field Theory (23rd : 2005 : Dublin, Ireland); Centre for the Subatomic Structure of Matter; School of Chemistry and PhysicsItem Metadata only The negativity of the overlap-based topological charge density correlator in pure-glue QCD and the non-integrable nature of its contact part(Elsevier Science BV, 2005) Horvath, Ivan; Alexandru, Andrei; Zhang, Jian-Bo; Chen, Yanbei; Dong, Shao-Jing; Draper, Terrence; Liu, K. F.; Mathur, Nilmani; Tamhankar, Sonali; Thacker, Harry B.; Centre for the Sub-Atomic Structure of MatterItem Open Access Reality of the fundamental topological structure in the QCD vacuum(American Physical Society, 2005) Alexandru, Andrei; Horvath, Ivan; Zhang, Jian-Bo; Centre for the Sub-Atomic Structure of Matter; School of Chemistry and Physics : Physics and Mathematical PhysicsLong-range order of a specific kind has recently been found directly in configurations dominating the regularized QCD path integral. In particular, a low-dimensional global structure was identified in typical space-time distributions of topological charge defined via the overlap Dirac matrix. The presence of the order has been concluded from the fact that the structure disappears after random permutation of position coordinates in measured densities. Here we complete the argument for the reality of this structure (namely the conjecture that its existence is a consequence of QCD dynamics and not an artifact of the overlap-based definition of lattice topological field) by showing that the structure ceases to exist after randomizing the space-time coordinates of the underlying gauge field. This implies that the long-range order present in the overlap-based topological density is indeed a manifestation of the QCD vacuum, and that the notion of the fundamental structure (structure involving relevant features at all scales) is viable.Item Open Access Study of pentaquarks on the lattice with overlap fermions(American Physical Society, 2004) Mathur, Nilmani; Lee, Frank X.; Alexandru, Andrei; Bennhold, C.; Chen, Yanbei; Dong, Shao-Jing; Draper, Terrence; Horvath, Ivan; Liu, K. F.; Tamhankar, Sonali; Zhang, Jian-Bo; School of Chemistry and Physics : Physics and Mathematical PhysicsWe present a quenched lattice QCD calculation of spin-1/2 five-quark states with uudds̅ quark content for both positive and negative parities. We do not observe any bound pentaquark state in these channels for either I=0 or I=1. The states we found are consistent with KN scattering states which are checked to exhibit the expected volume dependence of the spectral weight. The results are based on overlap-fermion propagators on two lattices, 12³×28 and 16³×28, with the same lattice spacing of 0.2 fm, and pion mass as low as ∼180 MeV.