Publications (14)0 Total impact
-
Article: Charged particle multiplicity distributions inZ0 hadronic decays
[show abstract] [hide abstract]
ABSTRACT: This paper presents an analysis of the multiplicity distributions of charged particles produced inZ 0 hadronic decays in the DELPHI detector. It is based on a sample of 25364 events. The average multiplicity is n ch>=20.710.04(stat)0.77(syst) and the dispersionD=6.280.03(stat)0.43(syst). The data are compared with the results at lower energies and with the predictions of phenomenological models. The Lund parton shower model describes the data reasonably well. The multiplicity distributions show approximate KNO-scaling. They also show positive forward-backward correlations that are strongest in the central region of rapidity and for particles of opposite charge.Zeitschrift für Physik C 01/1991; 50(2):185-194. -
Article: Experimental study of the triple-gluon vertex
[show abstract] [hide abstract]
ABSTRACT: In four-jet events from e+e− →Z0 →multihadrons one can separate the three principal contributions from the triple-gluon vertex, double gluon-bremsstrahlung and the secondary quark-antiquark production, using the shape of the two-dimensional angular distributions in the generalized Nachtmann-Reiter angle and the opening angle of the secondary jets. Thus one can identify directly the contribution from the triple-gluon vertex without comparison with a specific non-QCD model. Applying this new method to events taken with the DELPHI-detector we get for the ratio of the colour factor Nc to the fermionic Casimir operator in agreement with the value 2.25 expected in QCD from Nc=3 and .Physics Letters B. -
Article: Energy-energy correlations in hadronic final states from Z0 decays
[show abstract] [hide abstract]
ABSTRACT: We have studied the energy-energy angular correlations in hadronic final states from Z0 decay using the DELPHI detector at LEP. From a comparison with Monte Carlo calculations based on the exact second order QCD matrix element and string fragmentation we find that . MeV, which corresponds to αs(91 GeV)=0.106±0.003(stat.)±0.003(syst.)+0.003-0.000(theor). The theoretical error stems from different choices for the renormalization scale of αs. In the Monte Carlo simulation the scale of αs as well as the fragmentation parameters have been optimized to described reasonably well all aspects of multihadron production.Physics Letters B. -
Article: Search for pair production of neutral Higgs bosons in Z0 decays
[show abstract] [hide abstract]
ABSTRACT: The pair production of the lightest scalar Higgs boson, h, and a pseudoscalar Higgs boson, A, was searched for in a data sample containing 10 000 hadronic Z0 decays. The search involved both leptonic and purely hadronic decay channels of each Higgs boson. No signal was found, and limits on the Higgs boson masses, in the framework of the minimal supersymmetric extension of the standard model, ar reported up to 35 GeV/c2 at 95% CL, for both tan β1 and tan β<1, where tan β is the ratio of the vacuum expectation values of the two Higgs doublets.Physics Letters B. -
Article: A study for intermittency in hadronic Z0 decays
-
Article: Measurement of the partial width of the decay of the Z0 into charm quark pairs
-
Article: A comparison of jet production rates on the Z0 resonance to perturbative QCD
-
Article: Energy-energy correlations in hadronic final states from Z0 decays
-
Article: Search for pair production of neutral Higgs bosons in Z0 decays
-
Article: Study of hadronic decays of the Z0 boson
-
Article: Search for scalar quarks in Z0 decays
-
Article: Experimental study of the triple-gluon vertex
-
Article: A search for sleptons and gauginos in Z0 decays
-
Article: Measurement of the partial width of the decay of the Z0 into charm quark pairs
[show abstract] [hide abstract]
ABSTRACT: A determination of the partial width of the Z0 boson into charm quark pairs is presented, based on a total sample of 36 900 Z0 hadronic decays measured with the DELPHI detector at the LEP collider. The production rate of cc̄ events is derived from the inclusive analysis of charged pions coming from the decay of charmed meson is constrained by kinematics to have a low pT with respect to the axis. The probability to produce these π± from D∗± decay in cc̄ events is taken to be 0.31 ±_0.05 as measured at √s=10.55 GeV. The measured relative partial width is in good agreement with the standard moel value of 0.171. Together with our previous measurement of the total hadronic width Γh this implies .Physics Letters B.
Top co-authors
Top Journals
Institutions
-
1991
-
Università degli studi di Udine
Udine, Friuli Venezia Giulia, Italy
-
