U boson searches at KLOE
  The existence of a secluded gauge sector could explain several puzzling astrophysical observations. This hypothesis can be tested at low energy e+e- colliders such as DAPHNE. Preliminary results obtained with KLOE data and perpectives for the KLOE-2 run, where a larger data sample is expected, are discussed. 
F. Archilli, D. Babusci, D. Badoni, I. Balwierz, G. Bencivenni, C.   Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, A. B...
hep-ex