Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations of Fermion Pair Production / Precision Predictions for (Un)stable W+W- Pairs

2; (2) TH Div.; 3); (3) SLAC; 4; (4) Theory Div.; 5); 5) ((1) Department of Physics; (5) Institute of Nuclear Physics; 6)

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Coherent Exclusive Exponentiation for Precision Monte Carlo Calculations of Fermion Pair Production / Precision Predictions for (Un)stable W+W- Pairs

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arxiv hep-ph/0009352 v1 submitted 2000-09-29 hep-ph

B.F.L. Ward (1 , 2 , 3) , S. Jadach (1 , 4 , 5) , W. P{l}aczek (2 , 6)

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M. Skrzypek (2 Z. Was (2 5) ((1) Department of Physics Astronomy University of Tennessee Knoxville TN USA (2) TH Div. CERN Geneva Switzerland (3) SLAC Stanford University Stanford CA (4) Theory Div. DESY Hamburg Germany (5) Institute of Nuclear Physics Krakow Poland (6) Institute of Computer Science Jagellonian University Poland)

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classification hep-ph

keywords exponentiationexclusiveprecisioncalculationscarlocoherentcomparisonenergies

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We present the new Coherent Exclusive Exponentiation (CEEX), in comparison to the older Exclusive Exponentiation (EEX) and the semi-analytical Inclusive Exponentiation (IEX), for the process e+e- -> f-bar f + n(gamma), f=mu,tau,d,u,s,c,b, with validity for centre of mass energies from tau lepton threshold to 1 TeV. We analyse 2f numerical results at the Z-peak, 189 GeV and 500 GeV. We also present precision calculations of the signal processes e+e- -> 4f in which the double resonant W+W- intermediate state occurs using our YFSWW3-1.14 MC. Sample 4f Monte Carlo data are explicitly illustrated in comparison to the literature at LEP2 energies. These comparisons show that a TU for the signal process cross section of 0.4 percent is valid for the LEP2 200 GeV energy. LC energy results are also shown.

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