منابع مشابه
Recent Results from LEP and Comparisons with Υ(4S) Experiments
Semileptonic (s.l.) B decays represent a favorable laboratory to study the dynamics of heavy quark decays, to determine the size of the |Vub| and |Vcb| CKM mixing matrix elements, crucial in the unitarity triangle test of the Standard Model, and to acquire informations on the structure of the B meson itself. The Aleph, Delphi, L3 and Opal experiments have analyzed together about 1.5 M s.l. B de...
متن کاملLineshape Results from Lep - 1993
In 1993 LEP performed a scan at three energy points around the Z 0 mass, with the primary aim of substantially improving the errors on M Z and ? z. The results of the preliminary lineshape analyses of the 4 LEP experiments are presented here, together with the combined LEP averages. The Z 0 mass and width are determined as M Z = 91:1899 0:0017 exp 0:004 lep Gev and ? z = 2:4971 0:0027 exp 0:002...
متن کاملResults from LEP High Energy
In November 1995 for the rst time LEP provided e + e ? collisions well above Z 0 peak. The luminosity of 6 pb ?1 per experiment at energies 130-140 GeV was provided. In this report preliminary results of four LEP experiments on Electro Weak model tests and searches for New Phenomena are presented.
متن کامل(some Of) Recent Γγ Measurements from Lep
Inclusive measurement of J/Ψ (DELPHI), search for η b (ALEPH) and measurement of the cross-section of the double-tagged γγ events (ALEPH) are briefly overviewed. 1 Measurement of inclusive J/Ψ production in γγ events (DELPHI) The measurement of J/Ψ production in γγ interactions provides an insight into heavy quark production and also a possibility to study the gluon parton density of a resolved...
متن کامل4 Final QCD results from LEP
Recent results on QCD studies in e + e − annihilations at LEP are presented. Data recorded by the LEP experiments at centre-of-mass energies between 91.2 to 206 GeV are included. The main topic is the measurement of αs from event shape variables and associated aspects like the energy evolution or non-perturbative power-law corrections. These 'standard' measurements are complemented by new deter...
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ژورنال
عنوان ژورنال: Pramana
سال: 2000
ISSN: 0304-4289,0973-7111
DOI: 10.1007/s12043-000-0143-9