Violation in Mixing

86 Ã Ë reconstruction and efficiency studies
0.508
0.506
0.504
0.502
0.5
0.498
0.496
0.494
observed Ks candidate masses
0.492
0 5 10 15 20 25 30 35 40
flight length (cm)
0.012
0.01
0.008
0.006
0.004
0.002
observed Ks candidate mass resolution
0
0 5 10 15 20 25 30 35 40
flight length (cm)
0.508
0.506
0.504
0.502
0.5
0.498
0.496
0.494
observed Ks candidate masses
0.492
0 5 10 15 20 25 30 35 40
flight length (cm)
0.012
0.01
0.008
0.006
0.004
0.002
observed Ks candidate mass resolution
0
0 5 10 15 20 25 30 35 40
flight length (cm)
Figure 3-6. Top plots: invariant mass as function of the 2-dimensional decay length in block 1 (left) and
block 2 (right) of the on-resonance data. Bottom plots: invariant mass resolution as function of the 2dimensional
decay length. 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.
¯ on-resonance data: block 1
– Monte Carlo: ��� � ¦ � �(stat) ¦ � �(MCstat)
– Data: ��� ¦ �� (stat) ¦ � �(MCstat) ¦ ���(lumi)
¯ on-resonance data: block 2
– Monte Carlo: ����� ¦ � �(stat) ¦ � �(MCstat)
– Data: ����� ¦ � �(stat) ¦ � �(MCstat) ¦ ���(lumi)
Efficiency in Monte Carlo sample is slightly below the data values. The absolute efficiency is therefore
��� in the block 1 on-resonance sample and ���� in the block 2 sample. We have also evaluated the
efficiency on Monte Carlo: in block 1 MC sample, the efficiency is ��� , while in block 2 MC sample, it
is the ���� .
MARCELLA BONA