Enhanced leading production of [ital D][sup [plus minus]] and [ital D][sup [plus minus]] in 250 GeV [pi][sup [plus minus]]-nucleon interactions

A leading charm meson is one with longitudinal momentum fraction, [ital x][sub [ital F]][gt]0, whose light quark (or antiquark) is of the same type as one of the quarks in the beam particles. We report on the production asymmetry, [ital A]=[[sigma](leading[minus][sigma](nonleading)]/[[sigma](leading...

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Veröffentlicht in:	Physical review letters 1994-02, Vol.72:6
Hauptverfasser:	Alves, G.A., Amato, S., Anjos, J.C., Appel, J.A., Astorga, J., Bernard, T., Bracker, S.B., Cremaldi, L.M., Darling, C.L., Dixon, R.L., Errede, D., Gay, C., Green, D.R., Jedicke, R., Karchin, P.E., Kwan, S., Lueking, L.J., de Mello Neto, J.R.T., Metheny, J., Milburn, R.H., de Miranda, J.M., da Motta Filho, H., Napier, A., Passmore, D., Rafatian, A., dos Reis, A.C., Ross, W.R., Santoro, A.F.S., Sheaff, M., Souza, M.H.G., Spalding, W.J., Stoughton, C., Streetman, M.E., Summers, D.J., Takach, S.F., Wallace, A., Wu, Z.
Format:	Artikel
Sprache:	eng
Schlagworte:	662230 - Quantum Chromodynamics- (1992-) 662340 - Hadron Interactions- (1992-) 663460 - Meson- & Hyperon-induced Reactions & Scattering- (1992-) ASYMMETRY BOSONS CHARM PARTICLES CHARMED MESONS D MESONS D MINUS MESONS D PLUS MESONS ELEMENTARY PARTICLES FIELD THEORIES HADRON-HADRON INTERACTIONS HADRONS INTERACTIONS MESON-BARYON INTERACTIONS MESON-NUCLEON INTERACTIONS MESONS NUCLEAR PHYSICS AND RADIATION PHYSICS PARTICLE INTERACTIONS PARTICLE PRODUCTION PERTURBATION THEORY PHYSICS OF ELEMENTARY PARTICLES AND FIELDS PION MINUS-NEUTRON INTERACTIONS PION MINUS-PROTON INTERACTIONS PION PLUS-NEUTRON INTERACTIONS PION PLUS-PROTON INTERACTIONS PION-NEUTRON INTERACTIONS PION-NUCLEON INTERACTIONS PION-PROTON INTERACTIONS PSEUDOSCALAR MESONS QUANTUM CHROMODYNAMICS QUANTUM FIELD THEORY
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Beschreibung
Zusammenfassung:	A leading charm meson is one with longitudinal momentum fraction, [ital x][sub [ital F]][gt]0, whose light quark (or antiquark) is of the same type as one of the quarks in the beam particles. We report on the production asymmetry, [ital A]=[[sigma](leading[minus][sigma](nonleading)]/[[sigma](leading)+[sigma](nonleading)] as a function of [ital x][sub [ital F]]. The data consist of 1500 fully reconstructed [ital D][sup [plus minus]] and [ital D][sup *[plus minus]] decays in Fermilab experiment E 769. We find a significant asymmetry for the production of charm quarks is not expected in perturbative quantum chromodynamics.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.72.812