Search for charmed mesons produced in hadronic interactions

Journal Article · Sun Mar 01 04:00:00 EST 1987 · Phys. Rev. D; (United States)

DOI:https://doi.org/10.1103/PhysRevD.35.1541· OSTI ID:5946606

Ginther, G; Edelstein, R M; Forsyth, C P; Gamarnik, K; Kreymer, A E; Lipton, R J; McQuade, J M; Potter, D M; Russ, J S; Spiegel, L

The hadronic production of charmed states was studied in a two-arm spectrometer using a 205-GeV/c negative-pion beam incident upon a beryllium target. One arm, filled with dense absorber, triggered the detectors upon the passage of a muon with a moderate transverse momentum and a total momentum of at least 4 GeV/c. The other arm was an open-geometry magnetic spectrometer which had both neutral- and charged-particle identification capabilities. The apparatus, the data, and an invariant-mass-plot search for evidence of charmed-meson production through several charged-particle decay modes are described. The K..pi.., K..pi pi.., and K..pi pi pi.. mass plots fail to reveal significant D-meson signals. Based upon the K..pi.. mass plots, the 95%-confidence upper limit on the DD-bar production cross section is found to be less than 51 ..mu..b per nucleon for the production models tested. A search for evidence of charged-D/sup */ production yields 30 +- 16 combinations above background in association with the expected trigger muon charge. Interpreted as a D/sup */ signal, this excess corresponds to a model-dependent inclusive DD-bar production cross section of 34 +- 18/sub -9//sup +14/ ..mu..b per nucleon. Model-dependent upper limits on the ratio of the F to D cross sections are also presented.

• Research Organization: Carnegie-Mellon University, Pittsburgh, Pennsylvania 15213
• OSTI ID: 5946606
• Journal Information: Phys. Rev. D; (United States), Journal Name: Phys. Rev. D; (United States) Vol. 35:5; ISSN PRVDA
• Country of Publication: United States
• Language: English

Related Subjects

645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BERYLLIUM 9 TARGET
BOSONS
CHARGED PARTICLES
CHARM PARTICLES
CHARMED MESONS
CROSS SECTIONS
D MESONS
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
F MESONS
GEV RANGE
GEV RANGE 100-1000
HADRONS
INCLUSIVE INTERACTIONS
INTERACTIONS
LINEAR MOMENTUM
MAGNETIC SPECTROMETERS
MASS
MEASURING INSTRUMENTS
MESONS
MONTE CARLO METHOD
MULTIWIRE PROPORTIONAL CHAMBERS
PARTICLE IDENTIFICATION
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
PROPORTIONAL COUNTERS
PSEUDOSCALAR MESONS
RADIATION DETECTORS
SPECTROMETERS
STRANGE PARTICLES
TARGETS
TRANSVERSE MOMENTUM