Several recent astrophysical observations have revived the idea of the existence of a hidden force weakly coupled to ordinary matter, mediated by new gauge bosons of masses in the MeV to GeV range.  
These new bosons can be produced at  present day accelerators,  both in collider experiments and in fixed target ones.

A first successful meeting to discuss these issues was held in September 2009 at SLAC.  At the time,  new experimental activities were announced to start in several different laboratories.

This workshop intends to bring theorists and experimentalists together to make the point on the advances in the field since then.

The connection of these studies to the search for dark matter, as well as the potentials of future facilities, presently under study, will also be addressed.

 

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