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Proton-proton elastic scattering using 201-and 400-GeV/c extracted beams at Fermilab has been measured in the region 4.9

We present a study of 43 000 3-jet events from Z° boson decays. Both the measured jet energy distributions and the event orientation are reproduced by second order QCD. An alternative model with scalar gluons fails to describe the data.

No abstract

General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We present a study of jet multiplicities based on 37 000 hadronic Z ° boson decays. From this data we determine the strong X +0,012 coupling constant oq = 0.115 + 0.005 (e p. ) -O.OLO (theor.) to second order QCD at x/s = 91.22 GeV.

Proton-proton elastic scattering has been measured in the region 4.9< \t I < 12.1 GeV 2 at a beam momentum of 201 GeV/c. If the form exp(A£) is fitted to the data, the exponent A gradually changes from 1.5 to 0.9 GeV" 2 over our t range. The data are consistent with the form exp(-6.6^±). A comparison with intersecting storage ring results shows that in this kinematical region the slopes are about the same, but dcr/dt at fixed t is still dropping with energy.

General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We have measured the properties of Z°--,bl] decays using a sample of 944 inclusive muon events, corresponding to 18000 hadron events obtained with the L3 detector at LEP. We measured the partial decay width of the Z ° into bb, Fb6 = 353 _+ 48 MeV, and we determined the vector coupling of the Z ° to the b quark; g~,(b)=0.095 _+ 0.047. We measured the forward-backward charge asymmetry in e + e-~bl~ events at ,,/s ~ Mz, and obtained Ab~ = 13.3 _+ 9.9%.

Proton-proton elastic scattering at 400 GeV/c has been measured in the region 5.4 < -t < 14,4 QeV 2 with no sign of a second dip or "break." If the data are fitted by exp(At), the slope A decreases from 1.5± 0.1 to 0.7± 0.2 GeV" 2 over the range. At fixed t the 400-GeV/c cross sections are about 0.6 times those at 200 GeV/c in this t range. At fixed 0_ m =15°, da/dt^s""where n= 9.7±0.3.