Which is exactly why I stole your macro, removed those Fano tensors, and
introduced elastic cuts! :)
Pete
PS I believe my Fano tensors are included in A^{V}_{ed}
On Thu, 29 Apr 2004, vitaliy ziskin wrote:
> John,
> This is exactly what we are doing in the quasi-elastic case. We cancel
> the tensor term by using tensor -2 states information.
>
> Cheers, Vitaliy
>
> jrc@physics.unh.edu wrote:
>
> >I understand why Pete and Genya are getting different results for the
> >vector asymmetry in ed elastic scattering. Below is a note that Genya
> >forwarded to Pete. By only using N1+N2 in the denominator, Genya's
> >asymmetry includes the tensor polarization in the denominator. N1+N2
> >is proportional to the cross section multiplied by (1 + P_T*A_T). The
> >tensor analyzing power is strongly negative, thereby reducing the
> >denominator and making the apparent asymmetry larger.
> >
> >On the other hand, I have Pete dividing the same numerator N1-N2 by
> >the sum of all 6 polarization states, which is just proportional to
> >the cross section and independent of tensor polarization. Since 4
> >polarization states are used in the numerator and 6 in the denominator,
> >the resulting asymmetry is multiplied by 6/4. The reason for extracting
> >the vector asymmetry this way is obvious. It is independent of the
> >tensor asymmetry.
> >
> >
> >---------------------------- Original Message ----------------------------
> >Subject: Re: no timing cuts? (fwd)
> >From: "Peter Karpius" <karpiusp@einstein.unh.edu>
> >Date: Wed, April 28, 2004 1:57 pm
> >To: jrc@einstein.unh.edu
> >--------------------------------------------------------------------------
> >
> >John-
> >
> > Here is what I got from Genya- perhaps we are doing the same thing
> >he just separates tensor with cuts (this is what you said right? Tensor
> >beam-target asym is zero for elastic?)
> >
> > Pete
> >
> >
> >> I calculate asymmentry as (N1 - N2)/(N1+N2),
> >> where N1 = N++ + N--; N2= N+- + N-+, where signs correspond to
> >>target polarization and beam helicity.
> >>
> >>
> >
> >
> >
> >
> >
> >
> >
> >
> >
>
----------------------------------------------
Pete Karpius
Graduate Research Assistant
Nuclear Physics Group
University of New Hampshire
phone: (603)862-1220
FAX: (603)862-2998
email: karpiusp@einstein.unh.edu
http://pubpages.unh.edu/~pkarpius/homepage.htm
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