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

Journal Article · Mon Feb 07 04:00:00 EST 1994 · Physical Review Letters; (United States)

DOI:https://doi.org/10.1103/PhysRevLett.72.812· OSTI ID:5018959

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 ^[1]

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1. Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro (Brazil) Fermi National Accelerator Laboratory, Batavia, Illinois 60510 (United States) University of Mississippi, Oxford, Mississippi 38677 (United States) University of Toronto, Toronto, Ontario, M5S 1A7 (Canada) Tufts University, Medford, Massachusetts 02155 (United States) University of Wisconsin-Madison, Madison, Wisconsin 53706 (United States) Yale University, New Haven, Connecticut 06511 (United States)

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.

• OSTI ID: 5018959
• Journal Information: Physical Review Letters; (United States), Journal Name: Physical Review Letters; (United States) Vol. 72:6; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PERTURBATION THEORY
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