4 research outputs found
K0s K0s Final State in Two-Photon Collisions and Implications for Glueballs
The K0s K0s final state in two-photon collisions is studied with the L3
detector at LEP. The mass spectrum is dominated by the formation of the
f_2'(1525) tensor meson in the helicity-two state with a two-photon width times
the branching ratio into K Kbar of 76 +- 6 +- 11 eV. A clear signal for the
formation of the f_J(1710) is observed and it is found to be dominated by the
spin-two helicity-two state. No resonance is observed in the mass region around
2.2 GeV and an upper limit of 1.4 eV at 95% C.L. is derived for the two-photon
width times the branching ratio into K0s K0s for the glueball candidate
xi(2230)
Measurement of the W-Pair Production Cross Section and W-Decay Branching Fractions in Interactions at = 189 GeV
The data collected by the L3 experiment at LEP at a centre-of-mass energy of are used to measure the W-pair production cross section and the W-boson decay branching fractions. These data correspond to an integrated luminosity of 176.8~pb. The total cross section for W-pair production, combining all final states, is measured to be ~pb. Including our data collected at lower centre-of-mass energies, the hadronic branching fraction of the W-boson is determined to be . The results agree with the Standard Model predictions.The data collected by the L3 experiment at LEP at a centre-of-mass energy of 188.6 GeV are used to measure the W-pair production cross section and the W-boson decay branching fractions. These data correspond to an integrated luminosity of 176.8pb^-1. The total cross section for W-pair production, combining all final states, is measured to be sigma_WW = 16.24 +/- 0.37(stat.) +/- 0.22(syst.) pb. Including our data collected at lower centre-of-mass energies, the hadronic branching fraction of the W-boson is determined to be B(W ->qq) = [68.20 +/- 0.68 (stat.) +/- 0.33 (syst.) ] %. The results agree with the Standard Model predictions.The data collected by the L3 experiment at LEP at a centre-of-mass energy of 188.6 GeV are used to measure the W-pair production cross section and the W-boson decay branching fractions. These data correspond to an integrated luminosity of 176.8 pb â1 . The total cross section for W-pair production, combining all final states, is measured to be Ï WW =16.24±0.37 (stat.)±0.22 (syst.) pb. Including our data collected at lower centre-of-mass energies, the hadronic branching fraction of the W-boson is determined to be B (Wâqq)=[68.20±0.68 (stat.)±0.33 (syst.)]%. The results agree with the Standard Model predictions
Light resonances in Ks K pi and eta pi pi final states in gamma gamma collisions at LEP
The e+e- -> e+e- Ks K+- pi-+ e+e- -> e+e- eta pi+ pi- and final states are
studied with the L3 detector at LEP using data collected at centre-of-mass
energies from 183 GeV up to 202 GeV. The mass spectrum of the Ks K+- pi-+ final
state shows an enhancement around 1470MeV, which is identified with the
pseudoscalar meson eta(1440). This state is observed in gamma gamma collisions
for the first time and its two-photon width is measured to be Gamma_gamma
gamma(eta(1440))x BR(eta(1440)->KK pi)= 212 +/- 50(stat) +/- 23(sys)eV. Clear
evidence is also obtained for the formation of the axial vector mesons f1(1420)
and f1(1285). In the eta pi+ pi- channel the f1(1285) is observed, and upper
limits for the formation of eta(1440) and eta(1295) are obtained
1930 Calendar of the University of Adelaide
645ppThis edition includes Parts 1, 2, 3, 4 and Appendix. Part 1 includes detailed information on Council, Committees, Faculties and Boards, officers of the University, endowments and gifts, list of graduates, statutes, regulations, scholarships and prizes, and societies associated with the University. Part 2 includes regulations and other information relating to the Elder Conservatorium. Part 3 includes details relating to Public Examinations in Music. Part 4 includes the 1929 Annual Report, Commemoration Addresses, Bibliography and Financial Statements and details of University Acts. The Appendix includes syllabus of subjects for 1930 degree and diploma courses and timetables