Violation in Mixing
Violation in Mixing
Violation in Mixing
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142 Measurement of Branch<strong>in</strong>g Fractions for � ¦ � Ã � ¦ decays<br />
Table 5-9. Systematics errors for Ã Ë � asymmetry<br />
Ñ�Ë (Signal) Mean Ñ�Ë (Signal)<br />
Ñ�Ë (Bkg)<br />
�Ñ�Ë (Signal)<br />
¡� (Signal) Mean ¡� (Signal)<br />
�¡� (Signal)<br />
� Ë<br />
� Ë<br />
Ã Ë �<br />
ÃË� �<br />
� � �<br />
�<br />
�<br />
� � �<br />
�<br />
�<br />
�<br />
�<br />
�<br />
� � �<br />
�<br />
�<br />
� � �<br />
¡� (Bkg) ¦ �<br />
Fisher Fisher (Signal) ¦ � � �<br />
Fisher (Bkg) ¦ � � � �<br />
� � : Frac Sat Peak<br />
�<br />
� �<br />
� : Resolution ¦ �<br />
Total<br />
� : Offset -<br />
� : charge dependent PDFs ¦ � ¦ �<br />
¯ Fisher Output: The uncerta<strong>in</strong>ty due to the shape of � <strong>in</strong> signal events is determ<strong>in</strong>ed by us<strong>in</strong>g the<br />
shape obta<strong>in</strong>ed from � � � � decays <strong>in</strong> data. For background, alternative parameterizations are<br />
obta<strong>in</strong>ed from the fit done with off-resonance data and cont<strong>in</strong>uum Monte Carlo.<br />
¯ PID: The � parameterization offset and resolution have both been changed of ¦ � ÑÖ��. The<br />
fraction of the satellite peak has been varied from to � <strong>in</strong>dependently for � and K. Another<br />
systematic cross-check we have performed is us<strong>in</strong>g separate �ÁÊ� PDFs for positive and negative<br />
charged kaons or pions: this gives no change <strong>in</strong> the Ã Ë � yield and a �� difference <strong>in</strong> the asymmetry.<br />
When just one systematic check is tried, the error is assumed to be symmetric. The systematic uncerta<strong>in</strong>ties<br />
<strong>in</strong> the fit results are summarized <strong>in</strong> Table 5-8 for the Ã Ë � yield and <strong>in</strong> Table 5-9 for the asymmetry <strong>in</strong> the<br />
Ã Ë � mode. The systematics due to this method for the Ã Ë Ã mode is .<br />
5.5.5 ¡� distribution from on-resonance data<br />
We looked at the ¡� distribution the Ñ�Ë signal band: figure 5-14 shows the fit of the signal with a<br />
fixed background shape taken from Ñ�Ë side-band. Fitted ¡� mean and resolution are <strong>in</strong> good agreement<br />
with the ones estimated from � � control sample and used <strong>in</strong> the global likelihood fit. The mean value is<br />
�� ¦ ���Å�Î, the resolution is � ¦ ���Å�Îand the area gives �� ¦ � events: the � �Ò�� of the fit<br />
is � ���. Leav<strong>in</strong>g the background float<strong>in</strong>g the result is compatible with the quoted one.<br />
MARCELLA BONA<br />
�<br />
� �<br />
� �<br />
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