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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 Emlyn W. Hughes
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jcyoon



Joined: 08 Aug 2006
Posts: 213

PostPosted: Mon Oct 23, 2006 8:53 pm    Post subject: Parity Violation at E158 Reply with quote

emlyn@its.caltech.edu
Fri 2004-10-01 4:18 AM

Dear Professor Hughes,

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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Emlyn W. Hughes



Joined: 28 Sep 2006
Posts: 1

PostPosted: Mon Oct 23, 2006 8:55 pm    Post subject: Re: Parity Violation at E158 Reply with quote

Sat 2004-10-02 7:55 AM

The helicity is relevant for the laboratory frame. The physics asymmetry
that we are measuring is best understood in the lab frame in fact.

...although we measure it in the lab frame, of course.

Emlyn Hughes
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jcyoon



Joined: 08 Aug 2006
Posts: 213

PostPosted: Mon Oct 23, 2006 8:56 pm    Post subject: RE: Parity Violation at E158 Reply with quote

emlyn@slac.stanford.edu
Sat 2004-10-02 8:38 AM

Dear Professor Hughes,
That is exactly what I thought, but I am not sure how to answer the following argument.

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 explanation violates Lorentz invariance,
since it is not a frame-independent intrinsic property.

I would appreciate if you help on this.

Thanks,
J.C. Yoon


Last edited by jcyoon on Mon Oct 23, 2006 8:59 pm; edited 1 time in total
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jcyoon



Joined: 08 Aug 2006
Posts: 213

PostPosted: Mon Oct 23, 2006 8:57 pm    Post subject: RE: Parity Violation at E158 Reply with quote

Sat 2004-11-13 8:47 AM

Dear Professor Hughes,
I am afraid if you find this email annoying and sincerely apologize
for bothering you, but I would like to let you know I am still waiting for
you response.

I would be grateful if you can share your opinion with me.

Thanks,
J.C. Yoon
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