Measurement of the lifetimes of the charmed D/sup +/, F/sup +/ mesons and. lambda. /sub c//sup +/ charmed baryon

Thesis/Dissertation · Thu Jan 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6264960· OSTI ID:6264960

Errede, Steven Michael ^[1]

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1. The Ohio State Univ., Columbus, OH (United States)

An experiment was performed in the 350 GeV wide-band neutrino beam at the Fermi National Accelerator Laboratory using a high-precision, high-efficiency hybrid emulsion/neutrino spectrometer, with which the mean lifetimes of the D/sup +/, D/sup 0/, and F/sup +/ mesons and ..lambda../sub c//sup +/ baryon were measured. 1829 neutrino interactions were reconstructed with a vertex within the emulsion fiducial volume, 1242 of which were subsequently found in the emulsion. In 49 of the found neutrino events a charmed particle, produced at the primary vertex, was observed to decay within the emulsion volume. The mean lifetimes of charmed particles were determined from the reconstructed decays of 5 D/sup +/, 15 D/sup 0/, 3 F/sup +/ mesons: and 8 ..lambda../sub c//sup +/ baryons: tau/sub D/sup +// = 10.3/sub -4.2//sup +10.3/ x 10/sup -13/ sec; tau/sub D/sup 0// = 2.3/sub -0.5//sup +0.8/ x 10/sup -13/ sec; tau/sub f/sup +// = 2.0/sub -0.8//sup +1.8/ x 10/sup -13/ sec; and tau/sub ..lambda..//sub c//sup +/ = 2.3/sub -0.6//sup +1.0/ x 10/sup -13/ sec. The charmed particle masses measured in this experiment were: M/sub D/sup +// = 1851 +- 20 MeV/c/sup 2/; M/sub D/sup 0// = 1856 +- 15 MeV/c/sup 2/; M/sub F/sup +// = 2042 +- 33 MeV/c/sup 2/; M/sub ..lambda..//sub c//sup +/ = 2265 +- 30 MeV/c/sub 2/.

• Research Organization: Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE
• OSTI ID: 6264960
• Report Number(s): FERMILAB-THESIS--1981-05
• Country of Publication: United States
• Language: English

Related Subjects

645102* -- High Energy Physics-- Particle Interactions & Properties-Experimental-- Weak Interactions & Properties
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ACCELERATORS
BARYON RESONANCES
BARYONS
BOSONS
CHARM PARTICLES
CHARMED BARYON RESONANCES
CHARMED MESON RESONANCES
CYCLIC ACCELERATORS
D RESONANCES
D-1865 RESONANCES
DATA
DECAY
ELEMENTARY PARTICLES
ENERGY RANGE
EXPERIMENTAL DATA
F-2030 RESONANCES
FERMILAB ACCELERATOR
FERMIONS
GEV RANGE
GEV RANGE 100-1000
HADRONS
INFORMATION
LAMBDA-2250 RESONANCES
LEPTON REACTIONS
LIFETIME
MASS
MESON RESONANCES
MESONS
NEUTRINO REACTIONS
NUCLEAR REACTIONS
NUMERICAL DATA
PARTICLE DECAY
POSTULATED PARTICLES
RESONANCE PARTICLES
SYNCHROTRONS
WEAK PARTICLE DECAY