| 13 |
|
|
| 14 |
|
\subsection{Lepton Selection} |
| 15 |
|
|
| 16 |
< |
Because Z $\rightarrow\ell\ell$ ($\ell=e,\mu$) is a final state with very little |
| 17 |
< |
background after a Z mass requirement is applied to the leptons, |
| 16 |
> |
Because Z $\rightarrow\ell\ell$ ($\ell=e,\mu$) is a final state with very little background, |
| 17 |
|
we restrict ourselves to events in which the Z boson decays to electrons or muons only. |
| 18 |
< |
Therefore two same flavor, opposite sign leptons passing the ID described below are required in each event. |
| 18 |
> |
Therefore opposite sign leptons passing the identification and isolation requirements described below are required in each event. |
| 19 |
|
|
| 20 |
|
\begin{itemize} |
| 21 |
|
\item \pt $> 20$~GeV and $|\eta|<2.4$; |
| 22 |
< |
\item Opposite-sign SF lepton pairs (OF e$\mu$ events are retained in a control |
| 22 |
> |
\item Opposite-sign same-flavor (SF) ee and $\mu\mu$ lepton pairs (opposite-flavor (OF) e$\mu$ lepton pairs are retained in a control |
| 23 |
|
sample used to estimate the FS contribution); |
| 24 |
|
\item For SF events, the dilepton invariant mass is required to be consistent with the Z mass; namely $81<m_{\ell\ell}<101$ GeV. |
| 25 |
|
\end{itemize} |
| 27 |
|
\subsubsection{Electron Selection} |
| 28 |
|
|
| 29 |
|
The electron selection is the loose working point recommended by the E/gamma POG, as documented at~\cite{ref:Egamma}. |
| 30 |
+ |
Electrons with \pt $>$ 20 GeV and $|\eta|<2.4$ are considered. |
| 31 |
|
We use PF-based isolation with a cone size of $\Delta R<0.3$, using the effective area rho corrections documented at~\cite{ref:Egammaiso}, |
| 32 |
|
and we require a relative isolation $<$ 0.15. |
| 33 |
|
Electrons in the transition region defined by $1.4442 < |\eta_{SC}| < 1.566$ are rejected. |
| 34 |
+ |
Electrons with a selected muon with \pt $>$ 10 GeV within $\Delta R<0.1$ are rejected. |
| 35 |
|
The electron selection requirements are listed in Table~\ref{table:electrons} for completeness. |
| 36 |
|
|
| 37 |
|
\begin{table}[htb] |
| 58 |
|
|
| 59 |
|
\subsubsection{Muon Selection} |
| 60 |
|
|
| 61 |
< |
We use the tight muon selection recommended by the muon POG, as documented at~\cite{ref:muon}. We use PF-based isolation with a cone size |
| 61 |
> |
We use the tight muon selection recommended by the muon POG, as documented at~\cite{ref:muon}. |
| 62 |
> |
Muons with \pt $>$ 20 GeV and $|\eta|<2.4$ are considered. We use PF-based isolation with a cone size |
| 63 |
|
of $\Delta R<0.3$, using the $\Delta\beta$ PU correction scheme, and we require a relative isolation of $<$ 0.15. |
| 64 |
|
The muon selection requirements are listed in Table~\ref{table:muons} for completeness. |
| 65 |
|
|
| 102 |
|
This removes a few rare cases in which ``overcleaning" of a |
| 103 |
|
%ECAL recHit |
| 104 |
|
pfjet |
| 105 |
< |
generated fake MET. |
| 105 |
> |
generates fake MET. |
| 106 |
|
|
| 107 |
|
\item We also match photons to calojets and require (calojet \pt - photon \pt) $>$ -5~GeV |
| 108 |
|
(the same requirement used for pfjets). This is to remove other rare cases in which fake |
| 125 |
|
\label{sec:jetsel} |
| 126 |
|
|
| 127 |
|
\begin{itemize} |
| 128 |
< |
\item PF jets with L1FastL2L3 corrections (MC), L1FastL2L3residual corrections (data) |
| 128 |
> |
\item PF jets with L1FastL2L3 corrections (MC), L1FastL2L3residual corrections (data), using the 52X jet energy corrections |
| 129 |
|
\item $|\eta| < 2.5$ |
| 130 |
|
\item Passes loose PFJet ID |
| 131 |
|
\item \pt $ > 30$ GeV for determining the jet multiplicity, \pt $ > 15$ GeV for calculation of \Ht |
| 132 |
|
\item For the creation of photon templates, the jet matched to the photon passing the photon selection described above is vetoed |
| 133 |
|
\item For the dilepton sample, jets are vetoed if they are within $\Delta R < 0.4$ from any lepton \pt $ > 20$~GeV passing analysis selection |
| 134 |
+ |
\item To reject PU jets, we require the jets to satisfy $\beta>0.2$, defined for each jet using the $d_Z$ of the tracks in the jet with |
| 135 |
+ |
respect to the primary vertex. To calculate $\beta$ we take the sum of the $p_{T}^{2}$ of the tracks associated to PFCandidates in the jet |
| 136 |
+ |
that are consistent with originating from the primary vertex ($d_Z<0.5$~cm), and divide by the sum $p_{T}^{2}$ of all the tracks: |
| 137 |
+ |
\begin{equation} |
| 138 |
+ |
\beta = \frac{\Sigma_{i}^{\rm{d_z<0.5~cm}} (p_{T}^{i})^2}{\Sigma_{i}^{\rm{all}} (p_{T}^{i})^2} |
| 139 |
+ |
\end{equation} |
| 140 |
|
\end{itemize} |
| 141 |
|
|
