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Parity Violation at E158

 
This forum is locked: you cannot post, reply to, or edit topics.   This topic is locked: you cannot edit posts or make replies.    jcYoon's Physics Forum Index -> Professor Paul Souder
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jcyoon



Joined: 08 Aug 2006
Posts: 213

PostPosted: Tue Oct 24, 2006 1:03 pm    Post subject: Parity Violation at E158 Reply with quote

Fri 2004-10-01 4:18 AM
souder@phy.syr.edu

Dear Professor Souder,

Recently, I have read your paper on “Observation of Parity Nonconservation in Moller Scattering”.
However, there is one thing I could not figure out in this paper. As long as I know, the helicity of a
massive particle is not definite, since we can always find a boosted frame of reference in which
the helicity is the opposite. Therefore, it seems like your measurment of helicity of electron or muons
is only that of laboratory frame. I would like to appreciate if you can explain this issue.

I sincerely apologize for your time and effort if you find it unworthy of your attention.
I am looking forward to hearing from you.

Thanks,
J.C. Yoon
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Paul Souder



Joined: 28 Sep 2006
Posts: 1

PostPosted: Tue Oct 24, 2006 1:04 pm    Post subject: Re: Parity Violation at E158 Reply with quote

Fri 2004-10-01 4:41 AM

If I understand your question correctly, the
answer is the following:

Calculations are done in either the lab frame or the
CM frame. The helicity is defined in either of those frames.

Paul
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jcyoon



Joined: 08 Aug 2006
Posts: 213

PostPosted: Tue Oct 24, 2006 1:05 pm    Post subject: RE: Parity Violation at E158 Reply with quote

Fri 2004-10-01 5:03 AM

Dear Professor Souder,
Thanks your for quick reply and your kindness.
That is exactly what I thought, but the problem bothering me still remains.

Let us say we have physical observations of left-handed and right-handed electrons
in the lab frame. Since it is massive, both could be observed as that of right-handed electron
from a certain frame of refence. Therefore, our analysis is based on a specific frame
of reference does not hold in other frame and this violates Lorentz invariance.

I am not sure how to answer this question.
I would appreciate if you could help me on this.

Thanks,
J.C. Yoon
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