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Title: Hadron spectroscopy with ARGUS

Abstract

Results are reported from data accumulated by the ARGUS experiment, operating at around 10 GeV centre-of-mass energies in the DORIS II e/sup +/e/sup -/ storage ring at DESY. A search for free quarks yields an improved upper limit for their production cross section. For the first time, the production of antideuterons is observed in e/sup +/e/sup -/ annihilations. In radiative UPSILON(2S) decays three clearly resolved photon lines are observed corresponding to transitions to the /sup 3/P/sub J/ states with J = 0,1 and 2 of the bb-bar system. The observation of the decay D/sup 0/ ..-->.. K/sup 0//sub s/phi with a branching ratio BR(D/sup 0/ ..-->.. K-bar/sup 0/phi) = (0.99 +- 0.32 +- 0.17) % represents the first direct evidence for flavor annihilation by W exchange in charmed particle decays. A fit to the electron spectrum from semi-leptonic B meson decays provides a preliminary upper limit for the ratio of the Kobayashi-Maskawa matrix elements chemically bond V/sub bu/ chemically bond / chemically bondV/sub bc/ chemically bond of 0.14 (90% confidence level). A sample of about 1500 decays in the channel tau/sup -/ ..-->.. ..pi../sup +/..pi../sup -/..pi..+..nu..tau gives evidence for A/sub 1/ production at a 3..pi.. mass around 1100 MeV/c/sup 2/.more » A preliminary upper limit for the mass of the tau neutrino of 70 MeV/c/sup 2/ at the 95% confidence level is derived.« less

Publication Date:
Research Org.:
DESY, Hamburg, Germany
OSTI Identifier:
6054969
Report Number(s):
CONF-8504133-
Journal ID: CODEN: APCPC; TRN: 87-037978
Resource Type:
Conference
Journal Name:
AIP Conf. Proc.; (United States)
Additional Journal Information:
Journal Volume: 132:1; Conference: International conference on hadron spectroscopy, College Park, MD, USA, 20 Apr 1985
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ELECTRON-POSITRON INTERACTIONS; ANNIHILATION; PARTICLE PRODUCTION; HADRONS; HADRONIC PARTICLE DECAY; RADIATIVE DECAY; ANTIDEUTERONS; BRANCHING RATIO; CHARM PARTICLES; D RESONANCES; DATA ANALYSIS; FLAVOR MODEL; MASS SPECTRA; UPSILON-10000 RESONANCES; ANTIMATTER; ANTINUCLEI; ANTIPARTICLES; BASIC INTERACTIONS; CHARMED MESON RESONANCES; COMPOSITE MODELS; DECAY; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; INTERACTIONS; LEPTON-LEPTON INTERACTIONS; MATHEMATICAL MODELS; MESON RESONANCES; NUCLEI; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE MODELS; QUARK MODEL; RESONANCE PARTICLES; SPECTRA; 645103* - High Energy Physics- Particle Interactions & Properties-Experimental- Strong Interactions & Baryon & Meson Properties; 645102 - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties; 645101 - High Energy Physics- Particle Interactions & Properties-Experimental- Electromagnetic Interactions & Properties

Citation Formats

. Hadron spectroscopy with ARGUS. United States: N. p., 1985. Web.
. Hadron spectroscopy with ARGUS. United States.
. Sun . "Hadron spectroscopy with ARGUS". United States.
@article{osti_6054969,
title = {Hadron spectroscopy with ARGUS},
author = {},
abstractNote = {Results are reported from data accumulated by the ARGUS experiment, operating at around 10 GeV centre-of-mass energies in the DORIS II e/sup +/e/sup -/ storage ring at DESY. A search for free quarks yields an improved upper limit for their production cross section. For the first time, the production of antideuterons is observed in e/sup +/e/sup -/ annihilations. In radiative UPSILON(2S) decays three clearly resolved photon lines are observed corresponding to transitions to the /sup 3/P/sub J/ states with J = 0,1 and 2 of the bb-bar system. The observation of the decay D/sup 0/ ..-->.. K/sup 0//sub s/phi with a branching ratio BR(D/sup 0/ ..-->.. K-bar/sup 0/phi) = (0.99 +- 0.32 +- 0.17) % represents the first direct evidence for flavor annihilation by W exchange in charmed particle decays. A fit to the electron spectrum from semi-leptonic B meson decays provides a preliminary upper limit for the ratio of the Kobayashi-Maskawa matrix elements chemically bond V/sub bu/ chemically bond / chemically bondV/sub bc/ chemically bond of 0.14 (90% confidence level). A sample of about 1500 decays in the channel tau/sup -/ ..-->.. ..pi../sup +/..pi../sup -/..pi..+..nu..tau gives evidence for A/sub 1/ production at a 3..pi.. mass around 1100 MeV/c/sup 2/. A preliminary upper limit for the mass of the tau neutrino of 70 MeV/c/sup 2/ at the 95% confidence level is derived.},
doi = {},
journal = {AIP Conf. Proc.; (United States)},
number = ,
volume = 132:1,
place = {United States},
year = {1985},
month = {6}
}

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