Violation in Mixing

3.3 Studies on data 93
Figure 3-13. Values of the Ã Ë efficiency corrections for block 1 (left) and block 2 (right) data. The red dots
represent the corrections with the 1GeV momentum cut, while the black one are the values obtained from the
no momentum-cut sample.
the 2-dimensional flight length. Note that, with respect to Run 1 distributions (see Fig. 3-6), there is not any
more a drop at the end of the SVT (around cm). This should be due to an improved alignment of the
SVT itself.
Fig. 3-17 show the invariant mass and resolution of the reconstructed Ã Ë as function of the Ã Ë momentum.
The high statistics allows for very stable fits in almost all bins and the mass distribution shows a very good
agreement with the PDG mass [14], with the exception of the low momentum values where the Run 1
behaviour with a positive slope is still present (compare to Fig. 3-7).
Ã Ë RECONSTRUCTION AND EFFICIENCY STUDIES