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- W43408204 abstract "We discuss the constraints on the Z ′ model parameters coming from Z-pole and low-energy νμ − e scattering data in the frame work of GUT-motivated models. We find that when the coupling constant of the extra U(1) is small (large) the parameter space is mainly determined by the Z-pole (the low-energy νμ − e scattering) data. Introduction Deviations of the precisely measured electroweak observables from the predictions of the SM [1] enable one to search for the existence of new physics. Although there are various possibilities for extending the SM, one of the simplest and well-motivated extension is the addition of an extra U(1) to its SU(3)C×SU(2)L×U(1)Y gauge structure [2]. The Z-pole and neutral current data can be used to search for and set limits on the existence of the Z′ models [3]. The Z-pole observables are sensitive only to the Z − Z′ mixing angle due to the modifications in the vector and axial couplings of the fermions to the Z-boson. On the other hand, off-Z-pole e+−e− data, and low energy νμ−e, v-hadron and parity-violating e-hadron scattering experiments are sensitive to both Z−Z′ mixing and Z′ mass [3]. Therefore, accompanying the Z-pole data, the low-energy observables are particularly useful in establishing the constraints on the Z′ physics. For example, atomic parity violation experiments (particularly for cesium) has already been analyzed in this direction [4, 5]. In this work we investigate the implications of ∆ρ and CHARM II data [6] on the Z′ models by comparing them with the SM predictions [7, 8, 9]. In the analysis, we illustrate two GUT-motivated models and reach conclusions of general applicability. In Sec. 2 we give the relevant formulae for the effective vector and axial couplings in the frame work of the Z′ models. Moreover, we list SM expressions and derscribe the ∗e-mail:ddemir@ictp.trieste.it Present Address: ICTP, Trieste, Italy" @default.
- W43408204 created "2016-06-24" @default.
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- W43408204 date "1998-09-13" @default.
- W43408204 modified "2023-09-27" @default.
- W43408204 title "Implications of Deltarho and Charm II data for Z' Physics" @default.
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