ar X iv : h ep - p h / 06 07 07 7 v 1 7 J ul 2 00 6 On the existence of heavy tetraquarks 1

ar X iv : h ep - p h / 06 07 07 7 v 2 1 5 Ja n 20 07 On the existence of heavy tetraquarks 1

Previous work done in collaboration with David Brink is reviewed in the light of the recent observation of new charmonium-like resonances which can be interpreted as tetraquarks. In the framework of a schematic quark model the spectrum of cc̄qq̄ tetraquarks is presented. Based on a talk given at the 11th International Conference on Nuclear Reaction Mechanisms, Varenna (Italy), June 12-16, 2006 2 ...

ar X iv : h ep - p h / 06 09 07 7 v 1 7 S ep 2 00 6 Hadron multiplicities in e + e − annihilation with heavy primary quarks

ar X iv : h ep - p h / 06 09 07 7 v 2 5 D ec 2 00 6 Hadron multiplicities in e + e − annihilation with heavy primary quarks

ar X iv : h ep - p h / 04 07 07 9 v 1 7 J ul 2 00 4 Multi - leg calculations with the GRACE / 1 - LOOP system

ar X iv : h ep - p h / 02 07 09 7 v 1 6 J ul 2 00 2 Remarks on the compactified six - dimensional model of a particle

Non-homogeneous gauge ground state solutions in a six-dimensional gauge model in the presence of non-zero extended fermionic charge density fluctuations are reviewed and fully reinterpreted.