claudioc/dilNoteICHEP/yields.tex

\section{Event Yields}
\label{sec:yields}

In this Section we compare the event yields in SS and OS with
the MC predictions.  The MC predictions are normalized to
the data integrated luminosity (Section~\ref{sec:lumi}), 
and are broken down into contributions
from QCD, $\gamma +$ jets, and Drell-Yan.  The integrated
luminosity of the lowest $P_T$ QCD bin (QCDPt15) is only 
$\approx$ 7 nb$^{-1}$,
which is smaller than the integrated luminosity of the data.
Thus we have ``stitched'' together the QCDPt15 and QCDPt30
MC samples by requiring $\hat{P}_T < 30$ for the 
QCDPt15 sample.  Even so, the QCD statistics are not sufficient
for a meaningful comparison.  


The event yields in data and Monte Carlo for SS and 
OS are given in 
{\color{red}Tables~\ref{tab:yieldOS} and~\ref{tab:yieldSS}}
{\color{blue}as well as 
Tables~\ref{tab:yieldOS2} and~\ref{tab:yieldSS2}.}

\begin{table}[htb]
\begin{center}
{\color{red}
\caption{\label{tab:yieldOS} Observed and MC-predicted yields in the OS
selection.  Quoted uncertainties are MC statistics only.  In case that
no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
of one QCDPt15 MC event.  (Old Table which is updated below)} 
\begin{tabular}{|l|c|c|c|c|c|} \hline
Final State & QCD & $\gamma +$ jet & DY & Total MC & Data \\
\hline
ee      & 0$\pm$2 & 0.01 $\pm$ 0.004 & 0.83$\pm$0.02  & 0.84$\pm$2.0 & 2  \\
e$\mu$  & 0.17$\pm$2 & 0.000$\pm$0.004  & 0.08 $\pm$ 0.01& 0.25$\pm$2.0 & 0 \\
$\mu\mu$& 0$\pm$2 & 0                & 1.36$\pm$0.03  &1.36$\pm$2.0& 3  \\
\hline
All &0.17$\pm$3  &0.01$\pm$0.004  & 2.27$\pm$0.03 & 2.44$\pm$3.0 & 5 \\
\hline
\end{tabular}
}
\end{center}
\end{table}


\begin{table}[htb]
\begin{center}
{\color{red}
\caption{\label{tab:yieldSS} Observed and MC-predicted yields in the SS
selection. Quoted uncertainties are MC statistics only.  In case that
no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
of one QCDPt15 MC event.(Old Table which is updated below)} 
\begin{tabular}{|l|c|c|c|c|c|} \hline
Final State & QCD      & $\gamma +$ jet      & DY                & Total MC        & Data \\
\hline
ee       & $0 \pm 2$ & $0.002 \pm 0.002$ & $0.01  \pm 0.003$&$ 0.01\pm 2.0$  &0  \\
e$\mu$   & $0 \pm 2$ & $0.004 \pm 0.003$ & $0.005 \pm 0.002$&$ 0.01 \pm 2.0 $  &0 \\
$\mu\mu$ & $0 \pm 2$ & 0                 & $0.001 \pm 0.001$&$ 0.001\pm 2.0 $ &0 \\
\hline
All      & $0 \pm 3$ & $0.006 \pm 0.003$ & $0.016 \pm 0.003$&$0.02\pm 3.0 $ &0 \\
\hline
\end{tabular}
}
\end{center}
\end{table}


\begin{table}[htb]
\begin{center}
{\color{blue}
\caption{\label{tab:yieldOS2} Observed and MC-predicted yields in the OS
selection.  Quoted uncertainties are MC statistics only.  In case that
no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
of one QCDPt15 MC event. (New updated Table)
THESE NUMBERS MUST BE FILLED IN RIGHT} 
\begin{tabular}{|l|c|c|c|c|c|} \hline
Final State & QCD & $\gamma +$ jet & DY & Total MC & Data \\
\hline
ee      & 0$\pm$2 & 0.01 $\pm$ 0.004 & 0.83$\pm$0.02  & 0.84$\pm$2.0 & 2  \\
e$\mu$  & 0.17$\pm$2 & 0.000$\pm$0.004  & 0.08 $\pm$ 0.01& 0.25$\pm$2.0 & 0 \\
$\mu\mu$& 0$\pm$2 & 0                & 1.36$\pm$0.03  &1.36$\pm$2.0& 3  \\
\hline
All &0.17$\pm$3  &0.01$\pm$0.004  & 2.27$\pm$0.03 & 2.44$\pm$3.0 & 5 \\
\hline
\end{tabular}
}
\end{center}
\end{table}


\begin{table}[htb]
\begin{center}
{\color{blue}
\caption{\label{tab:yieldSS2} Observed and MC-predicted yields in the SS
selection. Quoted uncertainties are MC statistics only.  In case that
no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
of one QCDPt15 MC event.  (New updated Table) THESE NUMBERS MUST BE FILLED IN RIGHT} 
\begin{tabular}{|l|c|c|c|c|c|} \hline
Final State & QCD      & $\gamma +$ jet      & DY                & Total MC        & Data \\
\hline
ee       & $0 \pm 2$ & $0.002 \pm 0.002$ & $0.01  \pm 0.003$&$ 0.01\pm 2.0$  &0  \\
e$\mu$   & $0 \pm 2$ & $0.004 \pm 0.003$ & $0.005 \pm 0.002$&$ 0.01 \pm 2.0 $  &0 \\
$\mu\mu$ & $0 \pm 2$ & 0                 & $0.001 \pm 0.001$&$ 0.001\pm 2.0 $ &0 \\
\hline
All      & $0 \pm 3$ & $0.006 \pm 0.003$ & $0.016 \pm 0.003$&$0.02\pm 3.0 $ &0 \\
\hline
\end{tabular}
}
\end{center}
\end{table}


\clearpage


We find the $\gamma +$ jet MC predictions to be negligible.
The QCD statistics are so poor that we cannot make any quantitative
statement.
The OS data is dominated by Drell Yan.  The agreement between 
MC and data yields is good.  

For now we use the MC to predict the rate of SS events from Drell-Yan
off the $Z$ peak.  These events are mostly from electron charge misidentification.
We have developed techniques to measure this charge flip probability
from $Z \to ee$ data\cite{ref:SSSusy}. However, this cannot be done at the
present level of statistics.   Interestingly enough, we did find one SS 
$e^+e^+$ event that is removed by the $Z$-mass
cut.  We believe this to be a $Z \to e^+e^-$ event with one 
charge misassignment\cite{ref:HN}.  


Revision:	1.7
Committed:	Wed Jul 7 13:42:25 2010 UTC (14 years, 10 months ago) by claudioc
Content type:	application/x-tex
Branch:	MAIN
Changes since 1.6:	+59 -3 lines
Log Message:	First commit of the update for SUSY ICHEP
#	User	Rev	Content
1	claudioc	1.1	\section{Event Yields}
2			\label{sec:yields}
3
4			In this Section we compare the event yields in SS and OS with
5			the MC predictions. The MC predictions are normalized to
6			the data integrated luminosity (Section~\ref{sec:lumi}),
7			and are broken down into contributions
8			from QCD, $\gamma +$ jets, and Drell-Yan. The integrated
9			luminosity of the lowest $P_T$ QCD bin (QCDPt15) is only
10			$\approx$ 7 nb$^{-1}$,
11			which is smaller than the integrated luminosity of the data.
12			Thus we have ``stitched'' together the QCDPt15 and QCDPt30
13			MC samples by requiring $\hat{P}_T < 30$ for the
14			QCDPt15 sample. Even so, the QCD statistics are not sufficient
15			for a meaningful comparison.
16
17
18			The event yields in data and Monte Carlo for SS and
19	claudioc	1.7	OS are given in
20			{\color{red}Tables~\ref{tab:yieldOS} and~\ref{tab:yieldSS}}
21			{\color{blue}as well as
22			Tables~\ref{tab:yieldOS2} and~\ref{tab:yieldSS2}.}
23	claudioc	1.1
24			\begin{table}[htb]
25			\begin{center}
26	claudioc	1.7	{\color{red}
27	claudioc	1.2	\caption{\label{tab:yieldOS} Observed and MC-predicted yields in the OS
28			selection. Quoted uncertainties are MC statistics only. In case that
29	claudioc	1.5	no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
30	claudioc	1.7	of one QCDPt15 MC event. (Old Table which is updated below)}
31	claudioc	1.1	\begin{tabular}{\|l\|c\|c\|c\|c\|c\|} \hline
32			Final State & QCD & $\gamma +$ jet & DY & Total MC & Data \\
33			\hline
34	spadhi	1.6	ee & 0$\pm$2 & 0.01 $\pm$ 0.004 & 0.83$\pm$0.02 & 0.84$\pm$2.0 & 2 \\
35			e$\mu$ & 0.17$\pm$2 & 0.000$\pm$0.004 & 0.08 $\pm$ 0.01& 0.25$\pm$2.0 & 0 \\
36			$\mu\mu$& 0$\pm$2 & 0 & 1.36$\pm$0.03 &1.36$\pm$2.0& 3 \\
37	claudioc	1.1	\hline
38	spadhi	1.6	All &0.17$\pm$3 &0.01$\pm$0.004 & 2.27$\pm$0.03 & 2.44$\pm$3.0 & 5 \\
39	claudioc	1.1	\hline
40			\end{tabular}
41	claudioc	1.7	}
42	claudioc	1.1	\end{center}
43			\end{table}
44
45
46	claudioc	1.2
47	claudioc	1.1	\begin{table}[htb]
48			\begin{center}
49	claudioc	1.7	{\color{red}
50	claudioc	1.2	\caption{\label{tab:yieldSS} Observed and MC-predicted yields in the SS
51			selection. Quoted uncertainties are MC statistics only. In case that
52	claudioc	1.5	no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
53	claudioc	1.7	of one QCDPt15 MC event.(Old Table which is updated below)}
54	claudioc	1.1	\begin{tabular}{\|l\|c\|c\|c\|c\|c\|} \hline
55	claudioc	1.2	Final State & QCD & $\gamma +$ jet & DY & Total MC & Data \\
56	claudioc	1.1	\hline
57	spadhi	1.6	ee & $0 \pm 2$ & $0.002 \pm 0.002$ & $0.01 \pm 0.003$&$ 0.01\pm 2.0$ &0 \\
58			e$\mu$ & $0 \pm 2$ & $0.004 \pm 0.003$ & $0.005 \pm 0.002$&$ 0.01 \pm 2.0 $ &0 \\
59			$\mu\mu$ & $0 \pm 2$ & 0 & $0.001 \pm 0.001$&$ 0.001\pm 2.0 $ &0 \\
60	claudioc	1.1	\hline
61	spadhi	1.6	All & $0 \pm 3$ & $0.006 \pm 0.003$ & $0.016 \pm 0.003$&$0.02\pm 3.0 $ &0 \\
62	claudioc	1.1	\hline
63			\end{tabular}
64	claudioc	1.7	}
65	claudioc	1.1	\end{center}
66			\end{table}
67
68
69
70	claudioc	1.2
71	claudioc	1.7	\begin{table}[htb]
72			\begin{center}
73			{\color{blue}
74			\caption{\label{tab:yieldOS2} Observed and MC-predicted yields in the OS
75			selection. Quoted uncertainties are MC statistics only. In case that
76			no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
77			of one QCDPt15 MC event. (New updated Table)
78			THESE NUMBERS MUST BE FILLED IN RIGHT}
79			\begin{tabular}{\|l\|c\|c\|c\|c\|c\|} \hline
80			Final State & QCD & $\gamma +$ jet & DY & Total MC & Data \\
81			\hline
82			ee & 0$\pm$2 & 0.01 $\pm$ 0.004 & 0.83$\pm$0.02 & 0.84$\pm$2.0 & 2 \\
83			e$\mu$ & 0.17$\pm$2 & 0.000$\pm$0.004 & 0.08 $\pm$ 0.01& 0.25$\pm$2.0 & 0 \\
84			$\mu\mu$& 0$\pm$2 & 0 & 1.36$\pm$0.03 &1.36$\pm$2.0& 3 \\
85			\hline
86			All &0.17$\pm$3 &0.01$\pm$0.004 & 2.27$\pm$0.03 & 2.44$\pm$3.0 & 5 \\
87			\hline
88			\end{tabular}
89			}
90			\end{center}
91			\end{table}
92
93
94
95			\begin{table}[htb]
96			\begin{center}
97			{\color{blue}
98			\caption{\label{tab:yieldSS2} Observed and MC-predicted yields in the SS
99			selection. Quoted uncertainties are MC statistics only. In case that
100			no QCDPt15 MC event passes the selection, we quote the uncertainty as the weight
101			of one QCDPt15 MC event. (New updated Table) THESE NUMBERS MUST BE FILLED IN RIGHT}
102			\begin{tabular}{\|l\|c\|c\|c\|c\|c\|} \hline
103			Final State & QCD & $\gamma +$ jet & DY & Total MC & Data \\
104			\hline
105			ee & $0 \pm 2$ & $0.002 \pm 0.002$ & $0.01 \pm 0.003$&$ 0.01\pm 2.0$ &0 \\
106			e$\mu$ & $0 \pm 2$ & $0.004 \pm 0.003$ & $0.005 \pm 0.002$&$ 0.01 \pm 2.0 $ &0 \\
107			$\mu\mu$ & $0 \pm 2$ & 0 & $0.001 \pm 0.001$&$ 0.001\pm 2.0 $ &0 \\
108			\hline
109			All & $0 \pm 3$ & $0.006 \pm 0.003$ & $0.016 \pm 0.003$&$0.02\pm 3.0 $ &0 \\
110			\hline
111			\end{tabular}
112			}
113			\end{center}
114			\end{table}
115
116
117			\clearpage
118
119	claudioc	1.2
120	claudioc	1.1	We find the $\gamma +$ jet MC predictions to be negligible.
121			The QCD statistics are so poor that we cannot make any quantitative
122			statement.
123			The OS data is dominated by Drell Yan. The agreement between
124			MC and data yields is good.
125
126	claudioc	1.2	For now we use the MC to predict the rate of SS events from Drell-Yan
127			off the $Z$ peak. These events are mostly from electron charge misidentification.
128	claudioc	1.1	We have developed techniques to measure this charge flip probability
129			from $Z \to ee$ data\cite{ref:SSSusy}. However, this cannot be done at the
130			present level of statistics. Interestingly enough, we did find one SS
131			$e^+e^+$ event that is removed by the $Z$-mass
132			cut. We believe this to be a $Z \to e^+e^-$ event with one
133			charge misassignment\cite{ref:HN}.
134
135
136
137	claudioc	1.7