Journal ArticleDOI
Measurement of Semileptonic Decays of d Mesons to Electrons at the psi-prime-prime (3772)
J. M. Feller,Alan Litke,R. J. Madaras,Michael T Ronan,A. Barbaro-Galtieri,J. Dorfan,R. Ely,G. J. Feldman,A. Fong,B. Gobbi,G. G. Hanson,J. A. Jaros,B. P. Kwan,P. Lecomte,D. Lüke,J. F. Martin,T. S. Mast,D. H. Miller,Sherwood Parker,M. L. Perl,I. M. Peruzzi,M. Piccolo,T. P. Pun,P. A. Rapidis,Ronald R. Ross,Bernard Sadoulet,T. G. Trippe,V. Vuillemin,D. E. Yount +28 more
TLDR
In this article, anomalous electron production in multiprong events produced by e/sup +/e/sup -/ annihilation at the psi (3772) was observed and the branching ratio for D decay to an electron plus additional particles, averaged over the neutral and charged D, was found to be (7.2 +- 2.8) %.Abstract:
We have observed anomalous electron production in multiprong events produced by e/sup +/e/sup -/ annihilation at the psi (3772). For electron momenta greater than 300 MeV/c we measure an anomalous electron production cross section of 1.1 +- 0.3 nb. The measured spectrum is consistent with that expected for semileptonic D decay. With reasonable assumptions we find the branching ratio for D decay to an electron plus additional particles, averaged over the neutral and charged D, to be (7.2 +- 2.8) %.read more
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Journal ArticleDOI
Experimental-study of opposite-sign dimuons produced in neutrino and antineutrino interactions
Halina Abramowicz,J. De Groot,J. Knobloch,J. May,P. Palazzi,A. Para,F. Ranjard,Joseph Rothberg,W. von Rüden,W D Schlatter,J. Steinberger,H. Taureg,H. D. Wahl,Jorg Wotschack,F. Eisele,H. P. Klasen,K. Kleinknecht,H. Lierl,B. Pszola,B. Renk,H. J. Willutzki,F. Dydak,T. Flottmann,C. Geweniger,J. Królikowski,K. Tittel,Claude Guyot,Jean-Pierre Merlo,P. Perez,B. Peyaud,John Rander,Jp Schuller,R. Turlay,J. He,T. Ruan,W. Wu +35 more
TL;DR: In this article, a large sample of opposite-sign dimuons, produced by the interaction of neutrinos and antineutrinos in iron, is analyzed to provide information on the strength and space-time structure of the charm-producing weak current.
Journal ArticleDOI
Observation of an excess of νe, νe events in a beam dump experiment at 400 GeV
P. Alibran,N. Armenise,R. Arnold,J. H. Bartley,E. Bellotti,D. Bertrand,R. Blaes,A. Blondel,D. Blum,T. Bolognese,S. Bonetti,G. Bonneaud,J. Bourotte,F. W. Bullock,H. Burmeister,G. Carnesecchi,Donatella Cavalli,G. Conforto,B. Degrange,M. Dewit,O. Erriquez,B. Escoubes,E. Fiorini,A. G. Frodesen,J. Gillespie,M. Haguenauer,Ph. Heusse,F. Jacquet,T. W. Jones,A.M. Lutz,C. Matteuzzi,J. Morfin,M. T. Muciaccia-Fogli,P. Musset,S. Natali,U. Nguyen-Khac,S. Nuzzo,C. Pascaud,B. Pattison,M. Paty,P. Petitjean,M. J. Price,Alberto Pullia,J. L. Rieter,A. Rognebakke,M. Rollier,F. Romano,J. Sacton,O. Skjeggesta,J. Sleeman,W. Van Doninck,J.P. Vialle,H. Weerts,L. Welch,M. Willutzky,L. Zanotti +55 more
TL;DR: In this article, a beam dump experiment has been performed at CERN in Gargamelle using the neutrino facility to look for penetrating particles produced either directly in the beam interaction or by prompt decay of new particles.
Journal ArticleDOI
Observation of charmed D meson production in pp collisions
D. Drijard,H. G. Fischer,W. M. Geist,R. Gokieli,P. G. Innocenti,V. Korbel,A. Minten,A. Norton,R. Sosnowski,S. Stein,O. Ullaland,H. D. Wahl,P. Burlaud,M. Della Negra,G. Fontaine,P. Frenkiel,C. Ghesquiere,D. Linglin,G. Sajot,H. Frehse,E. E. Kluge,M. Heiden,A. Putzer,J. Stiewe,P. Hanke,W. Hofmann,M. Panter,K. Rauschnabel,J. Spengler,D. Wegener +29 more
TL;DR: In this article, evidence for the forward production of D + mesons has been found in pp collisions at a c.m. energy of 52.5 GeV and a signal of 92 ± 18 events above background has been observed in the decay channel.
Journal ArticleDOI
The properties of charmed particles
TL;DR: In this article, the authors present experimental information on the spectroscopy and decay properties of particles with non-zero values of the charm quantum number (charmed particles) and discuss the relation between the experimental results on charmed mesons and theoretical models based on spectator-quark and nonspectator quark decay mechanisms.
Journal ArticleDOI
Gluon correction to semileptonic decays of heavy quarks
TL;DR: In this paper, the lowest-order correction to the simple quark model of semileptonic heavy quark decays in quantum chromodynamics was calculated, and the results showed that the decays were suppressed substantially, as much as 35% for the charmed hadron decays.
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