Search for charmed mesons produced in hadronic interactions

Thesis/Dissertation · Tue Jan 01 04:00:00 EST 1985

OSTI ID:5613293

Ginther, Jr, G E

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 moderate transverse momentum and total momentum of at least 4 GeV/c. The other arm was an open geometry magnetic spectrometer containing both neutral and charged particle identification capabilities. This document describes the apparatus, the data, and an invariant mass plot search for evidence of charmed particle production through several charged particle decay modes. The K..pi.., K..pi pi pi.., and K..pi pi.. mass plots fail to reveal significant signals. Based upon the K..pi.. mass plots, the 95% confidence upper limit on the D anti-D production cross section is found to be less than 48 microbarns 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 D anti-D production cross section of 34 +/- 18/sub -g//sup +14/ microbarns per nucleon.

• Research Organization: Carnegie-Mellon Univ., Pittsburgh, PA (USA)
• OSTI ID: 5613293
• Country of Publication: United States
• Language: English

Related Subjects

645104* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Meson-Induced Interactions-- (-1987)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ALKALINE EARTH METALS
BERYLLIUM
BOSONS
CHARGED-PARTICLE REACTIONS
CHARM PARTICLES
CHARMED MESONS
CROSS SECTIONS
D MESONS
DATA
ELEMENTARY PARTICLES
ELEMENTS
ENERGY RANGE
EXPERIMENTAL DATA
GEV RANGE
GEV RANGE 100-1000
HADRON REACTIONS
HADRONS
INFORMATION
KAONS
MESON REACTIONS
MESONS
METALS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE PRODUCTION
PION MINUS REACTIONS
PION REACTIONS
PIONS
PSEUDOSCALAR MESONS
STRANGE MESONS
STRANGE PARTICLES