Yes, that code is meant to return the B-field at a point near the middle.
THe value of the field there is whatever is in the fieldmap - I know
Norman generated the fieldmap by scaling the fieldmap he was given, but I
don't know where he got the scale factor and it may not agree with the
number you're using. Looking at the fieldmap file, the peak field there
appears to be more like 0.240T.
On Wed, 27 Jan 2016, Holly Vance wrote:
> Hello,
>
> I've been calculating the momentum parameters separately offline and
> comparing them to what we get with just the invariant mass from recon.
>
> Does anyone know exactly what B-field value is being used? I see the call
> in TrackUtils:
> public static Hep3Vector getBField(Detector detector) {
> return detector.getFieldMap().getField(new BasicHep3Vector(0., 0.,
> 500.0));
> }
>
> So I assume this is the field value at the middle, but I wanted to check.
> Also do we expect this value to be the same as the one we obtained in mya?
> Does anyone know anything about this? I've been using 0.239T, but I get
> something slightly different (~1 MeV on invariant mass).
>
> Thanks,
> Holly
>
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