What is the significance of global fit in EW precision tests?

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Discussion Overview

The discussion revolves around the concept of "global fit" in electroweak (EW) precision tests, exploring its significance and implications in the context of experimental data and theoretical parameters.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant expresses a general understanding of "global fit" but seeks further clarification on its meaning and significance.
  • Another participant requests more precise language and examples to better understand the term.
  • One participant suggests that "global fit" refers to the fitting of data from various experiments conducted worldwide.
  • A different participant elaborates that it can also involve fitting multiple experimentally-measured quantities, such as the masses of W and Z bosons and their decay properties, to derive theoretical parameters like the Peskin-Takeuchi S and T parameters.

Areas of Agreement / Disagreement

The discussion does not appear to reach a consensus, as participants express varying levels of understanding and provide different interpretations of what "global fit" entails.

Contextual Notes

Some assumptions about the familiarity with electroweak precision tests and the specific parameters involved may not be explicitly stated, which could affect the clarity of the discussion.

fortuneteller
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I always hear that the "global fit" EW precision test. It seems that I understand it a little. But I am still very clear. Who can shed light on it?
 
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Can you expand a bit, your language is not quite correct.

Do you have some examples on where you have read this?
 
afaik "global fit" means fitting data of different experiments from all over the world
 
It can also refer to fitting several different experimentally-measured quantities (for example, masses of the W and Z bosons, Z boson partial decay widths and decay asymmetries) to extract parameters that appear in theoretical calculations of all of these quantities (such as the Peskin-Takeuchi S and T parameters).
 

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