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Subject Keyword PHYSICS ♦ D NEUTRAL MESONS ♦ SEMILEPTONIC DECAY ♦ MIXING ♦ ANTI-D NEUTRAL MESONS ♦ PIONS ♦ PIONS PLUS ♦ D*-2010 MESONS ♦ PARTICLE PRODUCTION ♦ QUANTUM NUMBERS ♦ CHARMED MESONS ♦ KAONS
Abstract We report the result of a search for {ital D}{sup 0}{ital {bar D}}{sup 0} mixing in the data from hadroproduction experiment E791 at Fermilab. We use the charge of the pion from the strong decay {ital D}{sup {asterisk}+}{r_arrow}{ital D}{sup 0}{pi}{sup +} (and charge conjugate) to identify the charm quantum number of the neutral {ital D} at production, and the charge of the lepton and the kaon in the semileptonic decays {ital D}{sup 0}{r_arrow}{ital Ke}{nu} and {ital K}{mu}{nu} to identify the charm at the time of decay. No evidence of mixing is seen. We set a 90{percent} confidence level upper limit on mixing of {ital r}{lt}0.50{percent}, where {ital r}={Gamma}({ital D}{sup 0}{r_arrow}{bar {ital D}}{sup 0}{r_arrow}{ital K}{sup +}{ital l}{sup {minus}}{nu}{sub {ital l}})/{Gamma}({ital D}{sup 0}{r_arrow}{ital K}{sup {minus}}{ital l}{sup +}{nu}{sub {ital l}}). {copyright} {ital 1996 The American Physical Society.}
ISSN 00319007
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-09-01
Publisher Place United States
Journal Physical Review Letters
Volume Number 77
Issue Number 12


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