Violation in Mixing

90 Ã Ë reconstruction and efficiency studies
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Ks reconstruction efficiency
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flight length (cm)
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Ks reconstruction efficiency
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Figure 3-10. On resonance data: Ã Ë reconstruction efficiency as function of decay length of the Ã Ë ’s in
both block 1 (left) and 2 (right) samples. The data-Monte Carlo comparison is presented: the empty dots
come from the Monte Carlo sample and the black points come from the on resonance data.
where �� � Æ��ÆØÓØ� , Æ� is the number of ÃË in the bin number �, ÆØÓØ� is the total number of ÃË candidates
in the � sample and � � are the correction values for the � sample. The error �� � on the correction is then
given by:
� � � �
× �
�
��� ¡ × � � ℄
where × � �
1 and block 2), the final correction should be calculated from a weighted average of �� and �� where the weights should be the relative luminosities of the two samples.
values
are the errors on the correction values for the � sample. Taking into account both samples (block
An example of the final correction can come from the analysis � ¦ � Ã Ë � ¦ : from the first set of
corrections, one gets � ¦ � � while from second set of corrections with the momentum cut, one gets
� � ¦ � �. The final correction would be:
�ÃË� � � � ¦ � �(stat) ¦ � (syst)
3.3.5 Run 2 data sample: first look at the Ã Ë reconstruction
These runs correspond to a subsample of the so-called block 1 data set in Run 2. The data sample consists
of:
MARCELLA BONA