arXiv subjects

M. Balazs

Publications and source records attributed to M. Balazs.

2 recordsLinked to original sources

arXiv2009

Radiation hardness qualification of PbWO4 scintillation crystals for the CMS Electromagnetic Calorimeter

Ensuring the radiation hardness of PbWO4 crystals was one of the main priorities during the construction of the electromagnetic calorimeter of the CMS experiment at CERN. The production on an industrial scale of radiation hard crystals and their certification over a period of several years represented a difficult challenge both for CMS and for the crystal suppliers. The present article reviews the related scientific and technological problems encountered.

physics.ins-det↗

arXiv2002

Lagrange formalism of point-masses

We prove by symmetry properties that the Lagrangian of a free point-mass is a quadratic function of the speed in the non-relativistic case, and that the action of the free point-mass between two spacetime points is the proper time passed in the relativistic case. These well known facts are proved in a mathematically rigorous way with a frame independent treatment based on spacetime models introduced by Matolcsi. The arguments show that these results are not obvious at all, some common beliefs can be refuted by explicit counterexamples. In our treatment the similarity of non-relativistic and relativistic cases is apparent.

math-ph↗