We have searched for the decay D-0 --> mu(+)mu(-) among 2.0 x 10(5) mu(+)mu(-) pairs produced, in the WA92 experiment, by 350 GeV/c pi(-) particles interacting in copper and tungsten targets. Using a high-resolution silicon-microstrip detector followed by a large-acceptance magnetic spectrometer and a muon filter we are able to measure the momentum of the muons, to visualize the event topology near their point of origin, and thus to discriminate between prompt and non-prompt muons. No D-0 --> mu(+)mu(-) candidate has been found. This result allows us to set an upper limit on the branching fraction B(D-0 --> mu(+)mu(-)) of 4.1 x 10(-6) at 90 % confidence level. (C) 1997 Published by Elsevier Science B.V.
Search for the flavour-changing neutral-current decay D-0->mu(+)mu(-)
ANGELINI, CARLO;
1997-01-01
Abstract
We have searched for the decay D-0 --> mu(+)mu(-) among 2.0 x 10(5) mu(+)mu(-) pairs produced, in the WA92 experiment, by 350 GeV/c pi(-) particles interacting in copper and tungsten targets. Using a high-resolution silicon-microstrip detector followed by a large-acceptance magnetic spectrometer and a muon filter we are able to measure the momentum of the muons, to visualize the event topology near their point of origin, and thus to discriminate between prompt and non-prompt muons. No D-0 --> mu(+)mu(-) candidate has been found. This result allows us to set an upper limit on the branching fraction B(D-0 --> mu(+)mu(-)) of 4.1 x 10(-6) at 90 % confidence level. (C) 1997 Published by Elsevier Science B.V.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
