Standard model coupling strengths

[karnten07]

Hi guys,

Where can i find the most up to date (accurate) values of the standard model coupling strengths at the mass of the Z boson? Thanks

Karnten07

 

[vanesch]

The particle data group:

http://pdg.lbl.gov/

I think that what you are looking for is in the summary tables.

(for the fine structure constant, see http://pdg.lbl.gov/2008/reviews/rpp2008-rev-phys-constants.pdf )

EDIT: oops, I misread your question: I thought you asked for the standard coupling constant and the mass of the Z boson.

What you ask for can be calculated from them, but you will depend on the exact renormalisation scheme you use (whatever you call 'the fine structure constant at Z mass' depends on your renormalisation scheme).

 

[sir-pinski]

Hi Karnten07,

You can find the most up-to-date values of the standard model coupling strengths at the mass of the Z boson on the Particle Data Group website. They regularly update their database with the latest experimental results from various experiments, including those at the Large Hadron Collider (LHC). The current values for the coupling strengths at the Z boson mass are:

- Electromagnetic coupling constant (α): 1/137.035999084(21)
- Weak isospin coupling constant (g_W): 0.65274(23)
- Weak hypercharge coupling constant (g_Y): 0.35755(23)
- Strong coupling constant (α_s): 0.1181(11)

These values are determined from a combination of experimental measurements and theoretical calculations. It's worth noting that these values may have small uncertainties due to the limitations of our current understanding of the standard model. However, they are considered to be the most accurate values available.

I hope this helps! Let me know if you have any other questions.