Hi, Chi!
Thanks - when you say it is from old copies: we still use the same
criterion to determine helicity and target states, right?
Or, to state my question more clearly: what is (are) the current method(s)
to determine (retrieve) beam helicity, target spin angle etc.?
In V3 lrn it says helicity is determined from coda, not epics etc.
Tracking down stuff I got to the things I mentioned previously (channel
3000 etc.)... don't be shy to give details, if possible. :-)
Thanks!
Adrian
-------------------------------
Adrian Sindile
Research Assistant
Nuclear Physics Group
University of New Hampshire
phone: (603)862-1691
FAX: (603)862-2998
email: asindile@alberti.unh.edu
http://einstein.unh.edu/~adrian/
On Tue, 6 Jan 2004, zhangchi wrote:
>
> Hi
>
> it is an ADC channel number. pedestal is one state and some channel above
> pedestal mark the other state. These are copies of codes from old lrn and
> charge.C so TB should have full explanation in glory detail.
>
> Chi
>
> On Tue, 6 Jan 2004, Adrian T Sindile wrote:
>
> > Hi, Chi (or anybody with two minutes)!
> > What is the 3000 value in TBLEvent we seem to use consistently to define
> > beam helicity, target spin state etc.?
> >
> >
> > fSpinBits = SpinBit((recon.fRaw->GetSHtgtstate1() < 3000) ? 1 : 0,
> > (recon.fRaw->GetSHtgtstate2() < 3000) ? 1 : 0,
> > (recon.fRaw->GetSHtgtstate3() < 3000) ? 1 : 0,
> > (recon.fRaw->GetSHtgtstate4() < 3000) ? 1 : 0,
> > (recon.fRaw->GetSHtgtstate5() < 3000) ? 1 : 0,
> > (recon.fRaw->GetSHtgtstate6() < 3000) ? 1 : 0,
> > (recon.fRaw->GetSHtgtdef() < 3000)? 1 : 0);
> > fBeamHel = (recon.fRaw->GetSHbeamhel() < 3000) ? 1 : -1;
> > fBeamFlip = (recon.fRaw->GetSHhelflip() < 3000) ? -1 : 1;
> >
> >
> > Thanks!
> >
> > Adrian
> >
> > -------------------------------
> > Adrian Sindile
> > Research Assistant
> > Nuclear Physics Group
> > University of New Hampshire
> > phone: (603)862-1691
> > FAX: (603)862-2998
> > email: asindile@alberti.unh.edu
> > http://einstein.unh.edu/~adrian/
> >
>
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