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Old May 30th 2019, 04:35 PM   #31
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Talking pig vs pig

A thread talking a super collider plan in China got more than 30 replys, nearly all are objections. The thread is in guokr.com. It's 中国花360亿建造大型对撞机,到底值不值?
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Old Jul 2nd 2019, 07:57 PM   #32
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Talking not anti vs anti

@dragon:
What' the identification property between electron and positron?
And What's the identification property between neutrino and anti neutrino?
By the way, how to speak "not anti" exactly in English?
Thank you.
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Old Jul 2nd 2019, 09:01 PM   #33
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Originally Posted by neila9876 View Post
@dragon:
What' the identification property between electron and positron?
And What's the identification property between neutrino and anti neutrino?
By the way, how to speak "not anti" exactly in English?
Thank you.
The term for "not anti" is simply to not say "anti." For example an electron is just electron, not a "not anti" anti-electron. I'm not sure of what you are asking?

The difference between an electron and an "anti-electron" (in other words, a positron) is that electrons carry a negative charge whereas a positron carries a positive charge. Also, a collision between an electron and positron gives two photons. The photon emission is characteristic for matter/anti-matter collisions. (It's not the only possible channel but it is typically the one that happens.)

The difference between a neutrino and anti-neutrino is a bit more subtle. Again we have the neutrino/anti-neutrino collision collision giving off two photons. In this case, though, the neutrinos interact only by the weak nuclear force and the collision is also likely to give out two Z particles, for instance, or even two W's. (I haven't looked up the exchange rates to find out if the weak bosons or photons are more likely. At higher energies. near the Z pole, the Z particles are more likely.) Also, neturinos are left handed and anti-neutrinos are right handed. This is independent of the reference frame you are using. (Electrons have either left or right handed spin, depending on what your reference frame is.)

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Old Jul 3rd 2019, 12:05 AM   #34
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Talking

@dragon:
Oh, just not say "anti"...good, that's a simpler method of representation.
In my own method of representation, even the identification property for charge and "anti" charge is chirality too...
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Old Jul 3rd 2019, 01:51 AM   #35
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Originally Posted by neila9876 View Post
@dragon:
Oh, just not say "anti"...good, that's a simpler method of representation.
In my own method of representation, even the identification property for charge and "anti" charge is chirality too...
How are you defining "chirality?" A particle's chirality has nothing to do with charge.

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Old Jul 3rd 2019, 03:29 AM   #36
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Red face

@dragon:
Yes, Sir. Nothing to do with, Sir.
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Old Jul 3rd 2019, 03:44 AM   #37
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Please do not call me "sir." Nor am I currently a professor. I prefer a more casual approach. However if you need something more formal you can call me by my degree: I hold a MS from Binghamton University. So please feel free to call me "Master." (I also respond to calls of "Hey you!" down a crowded hallway.)

-Dan
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Old Jul 3rd 2019, 06:51 AM   #38
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Red face language difference

I would rather you are a PHD in heaven............................
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Old Jul 4th 2019, 04:41 AM   #39
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Anti Analogies

I have been thinking about analogies for particle to anti-particle interactions.

Imagine setting up two vortices spinning in a fluid,
one going clockwise the other anti-clockwise.

Imagine these two vortices meeting, they will cancel each other out.
However you will be left with an increase in the energy of the fluid,
(it will get hotter).

This is analogous to a particle meeting its anti-particle
they will cancel each other, but their energy will remain (in the form of photons).

However the analogy rather falls down for Majorana Particles,
where a particle is its own anti-particle.

But where an analogy fails can be as illuminating as where it works.
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Old Jul 4th 2019, 04:03 PM   #40
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Talking

@Woody:
Vivid analogy. But it is so simple that it will render modern physics lose the sense of mystery. haha...
Even some famous scientists feel that neutrino is mysterious...
...............
Did anyone observe the annihiration between neutrion and anti neutrino in experiment?
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