Re: [BLAST_ANAWARE] Deuterium target angle

From: jrc@physics.unh.edu
Date: Mon Feb 02 2004 - 09:14:33 EST


I am at UT right now ... will see how it affects the elastic vector
asymmetry when I get back.

> I was looking into blastmc for the GeN experiment and my conclusion is
> that to do a best low Q^2 GeN experiment we need to move a target angle
> from 45 degrees to 35-30 degrees. Consider the following at Q^2 = 0.1
> and target angle at 45 degrees the difference between GeN Galster and
> GeN=0 is 0.02 !!!! A difference between Galster and 0.85*Galster is even
> smaller. Where as at Q^2 = 0.4 and target at 45 degrees the difference
> is 0.08. This is because at this target angle Q^2 = 0.1 gives thetad of
> about 120 degrees (cos = -0.5) and Q^2=0.4 gives about 90 degrees (cos =
> 0). Moving the target angle will improve a low Q^2 situation while
> making high Q^2 situation slightly worse. It's a trade-off that will
> allow me graduate soonner rather than later. Can some of the T20 people
> (and other effected parties) tell me what they think about this.
>
> Vitaliy
>
>

-- 
John R. Calarco
Dept. of Physics
Univ. of New Hampshire
Durham, NH 03824
email: calarco@unh.edu
phone: 603-862-2088
fax:   603-862-2998



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