We present a simple method for analyzing the impact of precision electroweak data above and below the Z peak on flavor-conserving, heavy new physics. We find that experiments have probed about ten combinations of new-physics effects, which to a good approximation can be condensed into the effective oblique parameters S, T, U, V, X, W, Y (we prove positivity constraints W,Y >= 0) and three combinations of quark couplings (including a distinct parameter for the bottom). We apply our method to generic extra Z(') vectors.
The minimal set of electroweak precision parameters
STRUMIA, ALESSANDRO
2006-01-01
Abstract
We present a simple method for analyzing the impact of precision electroweak data above and below the Z peak on flavor-conserving, heavy new physics. We find that experiments have probed about ten combinations of new-physics effects, which to a good approximation can be condensed into the effective oblique parameters S, T, U, V, X, W, Y (we prove positivity constraints W,Y >= 0) and three combinations of quark couplings (including a distinct parameter for the bottom). We apply our method to generic extra Z(') vectors.File in questo prodotto:
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