Frank L. H. Wolfs
Department of Physics and Astronomy, University of Rochester
T0 Vertex Studies
¥How can we explain this?
¥
¥Bug in software when T0 event is created? 
¥ Not very likely since it was written by a Dutchman, but investigated anyway by looking at the raw FB data.  Correlations are also clearly visible in these data.
¥
¥Effect of magnetic field?
¥ No; runs with no magnetic field show the same effect.
¥
¥Conclusion: this is a real effect.