Hi Ian and others,
On Wed, 27 Sep 2000, Ian Bearden wrote:
> 2) to ask what the sign convention is on the z-position. I think this
> was discussed in an earlier mail, but
> cannot find it at the moment. I am trying to compare the vertex
> position using the vertexing method and
> the vertex I would guess by projecting FFS tracks back to the nominal
> beam line. I'd like to make sure
> that we call the same thing positive z. So: is + z to the right if you
> stand in the parking lot and face the IR?
Yes, positive z as defined by BrTPMClusterVertex is to the right seen
from the parking lot (in the direction of FS.)
Trine
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