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

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

OSTI ID:5259375

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. A search was made for evidence of electron-strange particle coincidences, a signature of charmed particle production. The inclusive e/..pi.. ratio was measured with a magnetic spectrometer located at 32/sup 0/ from Beam 1 of Intersection 16 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/ev). 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.

• Research Organization: California Univ., Riverside (USA)
• OSTI ID: 5259375
• Report Number(s): TID-28036
• Country of Publication: United States
• Language: English

Related Subjects

645102 -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
645103* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Strong Interactions & Baryon & Meson Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYON-BARYON INTERACTIONS
BARYONS
BASIC INTERACTIONS
BOSONS
CHARM PARTICLES
COINCIDENCE METHODS
CORRELATIONS
COUNTING TECHNIQUES
DECAY
ELECTRONS
ELEMENTARY PARTICLES
ENERGY RANGE
FERMIONS
GEV RANGE
GEV RANGE 10-100
HADRON-HADRON INTERACTIONS
HADRONS
HYPERONS
INCLUSIVE INTERACTIONS
INTERACTIONS
KAONS
KAONS NEUTRAL
LAMBDA PARTICLES
LEPTONIC DECAY
LEPTONS
MESONS
NUCLEON-NUCLEON INTERACTIONS
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE PRODUCTION
PIONS
POSTULATED PARTICLES
PROTON-NUCLEON INTERACTIONS
PROTON-PROTON INTERACTIONS
PSEUDOSCALAR MESONS
STRANGE PARTICLES
WEAK INTERACTIONS