1,721,107 research outputs found
WWGENPV: a Monte Carlo event generator for four-fermion production in e+e- --> WW --> 4f
No full textThe Monte Carlo program {\tt WWGENPV}, designed for computing distributions and generating events for the four-fermion process e^+ e^- \to W^+ W^- \to 4f, is described. It is based on the calculation of the exact tree-level matrix element of the four-fermion reaction and includes initial-state radiation in the leading-log approximation within the structure function approach. The program can be used in a two-fold way: as a Monte Carlo integrator for weighted events, providing predictions for the total cross section, the W invariant-mass distribution, the radiative energy and invariant-mass loss; as a true event generator of unweighted events, useful for simulation purposes.The Monte Carlo program {\tt WWGENPV}, designed for computing distributions and generating events for the four-fermion process , is described. It is based on the calculation of the exact tree-level matrix element of the four-fermion reaction and includes initial-state radiation in the leading-log approximation within the structure function approach. The program can be used in a two-fold way: as a Monte Carlo integrator for weighted events, providing predictions for the total cross section, the invariant-mass distribution, the radiative energy and invariant-mass loss; as a true event generator of unweighted events, useful for simulation purposes
Higgs boson production in e+e- --> b
No full textThe production of the Standard Model Higgs boson in the four-fermion reaction e^+ e^- \to \mu^+ \mu^- b \bar b is studied. The complete tree-level matrix element, including signal and backgrounds in the standard electroweak theory, is computed and initial state radiation is taken into account in the leading-log approximation. A Monte Carlo event generator has been built and numerical results for some distributions of experimental interest for the search of the Higgs particle at future electron-positron colliders are shown, compared with those existing in the literature and commented.The production of the Standard Model Higgs boson in the four-fermion reaction is studied. The complete tree-level matrix element, including signal and backgrounds in the standard electroweak theory, is computed and initial state radiation is taken into account in the leading-log approximation. A Monte Carlo event generator has been built and numerical results for some distributions of experimental interest for the search of the Higgs particle at future electron-positron colliders are shown, compared with those existing in the literature and commented.The production of the Standard Model Higgs boson in the four-fermion reaction is studied. The complete tree-level matrix element, including signal and backgrounds in the standard electroweak theory, is computed and initial state radiation is taken into account in the leading-log approximation. A Monte Carlo event generator has been built and numerical results for some distributions of experimental interest for the search of the Higgs particle at future electron-positron colliders are shown, compared with those existing in the literature and commented.The production of the Standard Model Higgs boson in the four-fermion reaction e + e − → μ + μsu−b b is studied. The complete tree-level matrix element, including signal and backgrounds in the standard electroweak theory, is computed and initial state radiation is taken into account in the leading-log approximation. A Monte Carlo event generator has been built, and numerical results for some distributions of experimental interest in the search for the Higgs particle at future electron-positron colliders are shown, compared with those existing in the literature and commented.The production of the Standard Model Higgs boson in the four-fermion reaction is studied. The complete tree-level matrix element, including signal and backgrounds in the standard electroweak theory, is computed and initial state radiation is taken into account in the leading-log approximation. A Monte Carlo event generator has been built and numerical results for some distributions of experimental interest for the search of the Higgs particle at future electron-positron colliders are shown, compared with those existing in the literature and commented
On Large-Angle Bhabha Scattering at LEP
No full textThe theoretical accuracy of the program TOPAZ0 in the large-angle Bhabha channel is estimated. The physical error associated with the full Bhabha cross section and its forward and backward components separately is given for some event selections and several energy points of interest for LEP1 physics, both for the and non- contributions to the cross section
PHIPHI - A program for computing radiative Bhabha scattering cross sections at DAΦNE
No full textDescription of the code PHIPHI for simulation of the radiative Bhabha scattering processes in QED, including the region of very forward dynamics
Hard photon next-to-leading corrections to two-fermion production in e+e- collisions above the Z0 peak
No full textComplete next-to-leading order calculation of the initial-state O(alpha) photonic corrections to hadron and lepton-pair production in e+e- collisions. Phenomenological application to LEP2 physics
Structure function formulation of e+ e- -> f fbar around the the Z0 resonance in a realistic setup
No full textDevelopment of a structure function approach to e+e- annihilation into fermion pairs and to large-angle Bhabha scattering in the presence of realistic experimental cuts
On the QED radiator at order alpha^3
No full textCalculation of the O(alpha^3) leading logarithmic corrections to the QED radiator function. Application to precision physics at LEP1 and LEP2
SABSPV: a Monte Carlo integrator for small-angle Bhabha scattering
No full textSABSPV is a code designed to perform a theoretical evaluation of small-angle Bhabha scattering cross sections by suitably matching fixed-order perturbative calculations and structure-function techniques. The implementation of realistic experimental triggering conditions is achieved by using Monte Carlo integration.SABSPV is a code designed to perform a theoretical evaluation of small-angle Bhabha scattering cross sections by suitably matching fixed-order perturbative calculations and structure-function techniques. The implementation of realistic experimental triggering conditions is achieved by using Monte Carlo integration
The top quark and the Higgs-boson masses from LEP, SLC and CDF data
No full textAbstract: The impact of the new experimental data from LEP, SLC and CDF on the top quark mass and the Higgs boson mass is investigated. The determinations of m_{top} and of an upper bound on m_{Higgs} are given, taking into account the experimental error on the QED coupling constant \alpha_{em} and on the b-quark mass m_b. The relevance of higher order theoretical uncertainties is pointed out. briefly reviewed
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