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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hauptvorträge IV

HK 47.2: Invited Talk

Thursday, March 24, 2011, 10:00–10:30, HS1

Glueball spectrum from the lattice with exponentially improved statistical precision — •Michele Della Morte — Institut fuer Kernphysik, Becherweg 45, Mainz

We briefly review the computational strategy we have recently introduced for computing glueball masses and matrix elements, which achieves an exponential reduction of statistical errors compared to standard techniques. The global symmetries of the theory play a crucial role in the approach. We show how our previous work on parity can be generalized to other symmetries. In particular we discuss how to extract the mass of the 0++, 2++ and 0-+ lightest glueballs avoiding the exponential degradation of the signal to noise ratio. We present new numerical results including a numerical proof of the existence of a mass gap in the pure gauge theory.