1,721,171 research outputs found
Final Meeting of the Network Particle Physics Phenomenology at High Energy Colliders
No full textWork on electroweak precision calculations and event generators for electroweak physics studies at current and future colliders is summarize
Complete electroweak one loop radiative corrections to top pair production at TESLA: A Comparison
No full textFleischer J, Hahn T, Hollik W, Riemann T, Schappacher C. Complete electroweak one loop radiative corrections to top pair production at TESLA: A Comparison. 2002
Towards High-Precision Predictions for the MSSM Higgs Sector
Full text linkThe status of the evaluation of the MSSM Higgs sector is reviewed. The
phenomenological impact of recently obtained corrections is discussed. In
particular it is shown that the upper bound on m_h within the MSSM is shifted
upwards. Consequently, lower limits on tan beta obtained by confronting the
upper bound as function of tan beta with the lower bound on m_h from Higgs
searches are significantly weakened. Furthermore, the region in the M_A-tan
beta-plane where the coupling of the lightest Higgs boson to down-type fermions
is suppressed is modified. The presently not calculated higher-order
corrections to the Higgs-boson mass matrix are estimated to shift the mass of
the lightest Higgs boson by up to 3 GeV
Electroweak physics
Full text linkHollik W, Accomando A, del Aguila F, et al. Electroweak physics. Acta Physica Polonica B. 2004;35(11):2533-2555
Top Dipole Form Factors and Loop-induced CP-violation in Supersymmetry
No full textThe one-loop Minimal Supersymmetric Standard Model (MSSM) contributions to the weak and electromagnetic dipole form factors of the top quark are presented. Far from the Z peak, they are not sufficient to account for all the new physics effects. In the context of the calculation of the process e^+e^- -> t tbar to one loop in the MSSM, we compare the impact on the phenomenology of the CP-violating dipole form factors of the top quark with the contribution from CP-violating box graphs. Some exemplificative observables are analyzed and the relevance of both the contributions is pointed out. The one-loop expressions for the electromagnetic and weak dipole form factors in a general renormalizable theory and the SM and MSSM couplings and conventions are also given
One-loop MSSM contribution to the weak magnetic dipole moments of heavy fermions
No full textThe MSSM predictions at the one-loop level for the weak-magnetic dipole moments of the lepton and the quark are analysed. The entire supersymmetric parameter space is scannedwith the usual GUT constraint and common squark and slepton mass parameters. The real part of is dominated by the chargino contribution, being the same order as the SM one or even larger in the high region whereas the imaginary part, due to Higgs boson diagrams, is negligible comparedto the SM value. The real part of is controlled mainly by charginos andalso by gluinos, when the mixing in the bottom squark sector is large, to yield, for high , a contribution one order of magnitude largerthan the pure electroweak SM value but a factor five smaller than the standard QCD contribution. The imaginary part of is the same order as in the SM
Weak electric dipole moments of heavy fermions in the MSSM
No full textA minimal supersymmetric version of the Standard Model with complex parameters allows contributions to the weak-electric dipole moments of fermions at the one-loop level. Assuming generation-diagonal trilinear soft-susy-breaking terms and the usual GUT constraint, a set of CP-violating physical phases can be introduced. In this paper the general expressions for the one-loop contribution to the WEDM in a generic renormalizable theory are given and the size of the WEDM of the tau lepton and the b quark in such a supersymmetric model is discussed
Two-loop electroweak top corrections: are they under control?
No full textThis Report summarizes the results of 12 months' activities of the Working
Group on Precision Calculations for the Z Resonance, run at CERN in 1994.
The main goal of the Working Group was to present an update of studies on radiative corrections for the Z-resonance processes, integrating all new results
that had appearead since the previous Workshop on 'Z Physics at LEP 1', held in 1989.
The Report is, however, more than a mere collection of the proceedings of the three general meetings held on January 14, March 31 and June 13, 1994. Three subgroups have been working in the three related fields: electroweak physics, QCD at the Z resonance and Bhabha scattering in the luminosity region. An attempt has been made to present the final reports from these subgroups in a complete and homogeneous form. The subgroupgs' contributions in the three fields correspondingly comprise the three main parts of the Report
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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