Search for charmed particle production in proton-proton collisions at the CERN-ISR. [53 GeV (c. m. )]

Technical Report · Wed Jun 01 04:00:00 EDT 1977

DOI:https://doi.org/10.2172/6980764· OSTI ID:6980764

Marsh, W L

Experimental results on a search for charmed particle production in proton-proton collisions at the center of mass energy (..sqrt..s) of 53 GeV are presented. Evidence of cidences, a signature of charmed particle production, was sought. The inclusive e/..pi.. ratio was measured with a magnetic spectrometer located at 32/sup 0/ from Beam 1 of Intersection I6 of the CERN Intersecting Storage Rings (ISR). The e/..pi.. ratio from direct (unknown) sources was found to rise from 1.06 x 10/sup -4/ at p/sub perpendicular to/ = 1.5 GeV/c to 5.53 x 10/sup -4/ at p/sub perpendicular to/ = 0.25 GeV/c. One possible source for this signal is the semi-leptonic decay of charmed particles (e.g., D ..-->.. K/sup 0/ e..nu..). If so, then electron-strange particle (e.g., ..lambda../sup 0/,K/sup 0/) coincidences are expected. The charged decay products of ..lambda../sup 0/ and K/sup 0/ were detected in a multiparticle spectrometer surrounding Beam 1 downstream of the intersection. To determine if there is an electron-strange particle correlation, the number of ..lambda../sup 0/'s (K/sup 0/'s) in coincidence with an electron in the 32/sup 0/ spectrometer was compared with the number of ..lambda..'s (K/sup 0/'s) in coincidence with a hadron in the same kinematic range. No evidence for an enhanced production of strange particles with electrons relative to hadrons was found. However, given the acceptance of the apparatus, the absence of a signal is consistent with current models of charmed particle production and decay. 40 references, 51 figures, 20 tables.

• Research Organization: California Univ., Riverside (USA)
• DOE Contract Number: AT03-76ER70197
• OSTI ID: 6980764
• Report Number(s): DOE/ER/70197-T1
• 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
BARYON-BARYON INTERACTIONS
BOSONS
CHARM PARTICLES
CHARMED MESON RESONANCES
CHERENKOV COUNTERS
COINCIDENCE METHODS
COUNTING TECHNIQUES
D RESONANCES
DATA
DRIFT CHAMBERS
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
FERMIONS
GEV RANGE
GEV RANGE 100-1000
HADRON-HADRON INTERACTIONS
HADRONS
INFORMATION
INTERACTIONS
LEPTONS
MAGNETIC SPECTROMETERS
MASS SPECTRA
MEASURING INSTRUMENTS
MESON RESONANCES
MESONS
MULTIWIRE PROPORTIONAL CHAMBERS
NUCLEON-NUCLEON INTERACTIONS
NUMERICAL DATA
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
POSTULATED PARTICLES
PROPORTIONAL COUNTERS
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
RADIATION DETECTORS
RESONANCE PARTICLES
SCINTILLATION COUNTERS
SPECTRA
SPECTROMETERS
STRANGE PARTICLES