- #1
Ahmes
- 78
- 1
Hi,
We were told in a very-elementary elementary particles course, that a neutral current event was first observed in the following process:
[tex]\bar{\nu}_\mu + n \longrightarrow \bar{\nu}_\mu + X[/tex]
were X is "something other than muon" (n was a neutron).
I thought about it, and I don't know how X can be something other than a n, a neutron. The interaction between the neutrino and one of the neutron's quark is second order and flavor conserving, so only the momentum changes and not the particle identity.
Yet, I've searched the internet and found that it can also be:
[tex]X=n + \pi^0[/itex]
Where did the pion come from? there should be a photon or a gluon involved if it is to appear from the vacuum. How will the correct diagram look like? And what other things could X be?
And maybe even a more important question - the experiment was said to be done inside of a bubble chamber - BUT WE CAN ONLY SEE CHARGED PARTICLES THERE, NOT NEUTRONS, NEUTRINOS & NEUTRAL PIONS...
Can someone help?
Thanks!
We were told in a very-elementary elementary particles course, that a neutral current event was first observed in the following process:
[tex]\bar{\nu}_\mu + n \longrightarrow \bar{\nu}_\mu + X[/tex]
were X is "something other than muon" (n was a neutron).
I thought about it, and I don't know how X can be something other than a n, a neutron. The interaction between the neutrino and one of the neutron's quark is second order and flavor conserving, so only the momentum changes and not the particle identity.
Yet, I've searched the internet and found that it can also be:
[tex]X=n + \pi^0[/itex]
Where did the pion come from? there should be a photon or a gluon involved if it is to appear from the vacuum. How will the correct diagram look like? And what other things could X be?
And maybe even a more important question - the experiment was said to be done inside of a bubble chamber - BUT WE CAN ONLY SEE CHARGED PARTICLES THERE, NOT NEUTRONS, NEUTRINOS & NEUTRAL PIONS...
Can someone help?
Thanks!
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