PT Journal
AU LHCb Collaboration (Aaij, Rea
   Jaimes Elles, SJ
   Jashal, BK
   Martinez Vidal, F
   Oyanguren, A
   Rebollo De Miguel, M
   Remon Alepuz, C
   Ruiz Vidal, J
   Sanderswood, I
TI Search for Rare Decays of D0 Mesons into Two Muons
SO Physical Review Letters
JI Phys. Rev. Lett.
PY 2023
BP 041804
EP 13pp
VL 131
IS 4
DI 10.1103/PhysRevLett.131.041804
AB A search for the very rare D^{0}mu^{+}mu^{-} decay is performed using data collected by the LHCb experiment in proton-proton collisions at sqrt[s]=7, 8, and 13TeV, corresponding to an integrated luminosity of 9fb^{-1}. The search is optimized for D^{0} mesons from D^{*+}D^{0}pi^{+} decays but is also sensitive to D^{0} mesons from other sources. No evidence for an excess of events over the expected background is observed. An upper limit on the branching fraction of this decay is set at B(D^{0}mu^{+}mu^{-})<3.1*10^{-9} at a 90% C.L. This represents the world's most stringent limit, constraining models of physics beyond the standard model.
ER