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Interpretation of Gargamelle Experiment Photos

I have been trying to understand the Gargamelle experiment, but would like some clarification. I understand the apparatus is designed to cause charged particles to generate bubbles which are visible ...
user62783's user avatar
  • 291
1 vote
0 answers
54 views

Why is the fermionic sector of Standard Model the way it is? [closed]

"Because it works!" will be considered too broad an answer. I want to precisely know which experiments forced to consider the model construction the way it is. For example, I can see Wu's ...
Sanjana's user avatar
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1 vote
1 answer
185 views

Gamma Ray Emission in the Wu Experiment

In the classic Wu experiment (https://doi.org/10.1103/PhysRev.105.1413) parity violation was discovered in the weak interaction through the asymmetry in the distribution of electrons in the beta decay ...
jkcwioqnkfdsoia's user avatar
2 votes
1 answer
171 views

What is a CP number? In terms of CP-Symmetry and CP-Violation?

When researching the origins of CP-symmetry and CP-violation, and the Fitch-Cronin experiment demonstrating 'indirect' CP-violation, I came across these statements: https://www2.lbl.gov/abc/wallchart/...
Kurt Hikes's user avatar
  • 4,709
1 vote
1 answer
112 views

What are the weak force and strong force and higgs constants?

We use the SI System of measurement which is a human made system. In order to accurately describe forces/fields in nature we need to use certain experimentally determined constants to "scale"...
Sidharth Ghoshal's user avatar
0 votes
0 answers
48 views

Presenting Numbers in Particle Physics

We got some data from the OPAL-detector at CERN and were supposed to analyze the decay of the $Z^0$-particle. In order to do so, we had to write a Python-scriptum. Now, in Python, we obtained the ...
user avatar
6 votes
2 answers
917 views

A proton's weak charge is .0719. Is this dimensionless? A ratio?

A recent piece of major news in the physics world is that the proton's weak-force charge was measured to be .0719. Is that a ratio? A dimensionless number, with no units? The articles I read ...
Kurt Hikes's user avatar
  • 4,709
0 votes
1 answer
85 views

Why $\nu_ee^-$ has a larger scattering cross-section than $\nu_\mu e^-$ cross-section?

Why is the scattering cross-section of $\nu_\mu$'s with the electron $e^-$ much smaller than the scattering cross-section of $\nu_ee^-$ scattering both of which take place through charged current weak ...
SRS's user avatar
  • 27.2k
1 vote
1 answer
490 views

Wu experiment beta decay

maybe it's a stupid question. But in Wu experiment she showed that parity in not conserved in beta decay. So how to say on general that this is true for any weak force interaction?
Saladinos's user avatar
  • 123
1 vote
0 answers
50 views

What were the immediate consequences Yang-Lee work on Weak Interaction?

I am studying the history of Modern Physics and Yang-Lee earned their Nobel the next year after the Cobalt experiments. I am familiar with the chronology, but am not clear what those findings meant to ...
Ronald Yu's user avatar
9 votes
1 answer
2k views

Weinberg angle measurement methods

I was reading up on the history of $W/Z$ bosons today and I got a little puzzled. I always assumed that people measured $M_Z$ and $M_W$ and then derived the Weinberg angle. But it appears that they ...
user788171's user avatar
4 votes
2 answers
641 views

How many sigma did the discovery of the W boson have?

When the W boson was discovered in the 1980s, nobody spoke of sigmas. How many sigmas was it at that time?
Clara's user avatar
  • 427
3 votes
3 answers
985 views

Energy of the electron-muon reaction

Lets see the reaction: $e^- \mu^- \to e^- \pi^- \nu_\mu \;\;\;\;\;\;\;\;\;\;\; {(1)}$ I suppose, that this reaction occurs as follows $e^- \mu^- \to e^- \mu^- \pi^+ \pi^- \to e^- \pi^- \nu_\mu$ Is ...