Hi Bjorn, others, My purpose for writing is two-fold: 1) to thank Bjorn (sorry for misspelling your name, but it is a US keyboard!) for the very nice documentation on the Vertexing software. It is so good that even I was able to use the BrTPMClusterVertex after reading it! 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? Thanks, --Ian-------------------------------------------------------------------- | I.G. Bearden | | Niels Bohr Institute Tb 3 email: bearden@nbi.dk | | Blegdamsvej 17 phone: (+45) 35 32 53 23 | | København Ø FAX: (+45) 31 42 10 16 | | Danmark | ----------------------------------------------------------------------
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