Search for the flavour-changing neutral current decay D0 to mu+mu- in pp   collisions at sqrt(s) = 7 TeV with CMS
  A search for the flavour-changing neutral current decay D0 to mu+mu- is performed in pp collisions at sqrt(s) = 7 TeV using 90 pb-1 of data collected by the CMS experiment at the LHC. No evidence is found for this decay mode. The upper limit on the branching fraction B(D0 to mu+mu-) is 5.4x10-7 at the 90% confidence level. 
Daniele Pedrini
hep-ex