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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

%\title[GEANT4/EGS5]{GEANT4/EGS5}

\title{SeaQuest dark photon search}

\author{Sho Uemura}
%\institute{bumming around}
\date[March 13, 2019]

%\titlegraphic{
%\includegraphics[height=0.1\textheight]{SLAC_Logo}\hspace*{4.75cm}~
%\includegraphics[height=0.1\textheight]{partner_logo_v2}
%}

\begin{document}

%\setcounter{framenumber}{2} 
\begin{frame}
    \titlepage
\end{frame}

%\begin{frame}{Dark photon plans}
    %\begin{columns}
        %\column{0.65\textwidth}
        %\begin{itemize}
            %\item Parasitic run (alongside E1039)
            %\item EMCal upgrade (after E1039)
            %\item Long-term dark sectors program?
        %\end{itemize}
        %%\begin{center}
        %%\includegraphics[width=0.6\textwidth]{st2_done_1000}
        %%\end{center}
        %\column{0.35\textwidth}
        %%\includegraphics[width=\textwidth]{st1_done_1000}
    %\end{columns}
%\end{frame}

\begin{frame}{The SeaQuest facility}
    %\begin{columns}
    %\column{0.65\textwidth}
    \begin{itemize}
        \item Fixed target muon spectrometer, Fermilab 120 GeV proton beam
        \item E906/SeaQuest ended 2017; E1039/SpinQuest (polarized target) takes first beam this year
        \item Parasitic searches for dark photons approved 2015
            %\item Thin ($\sim$10\%$\lambda_I$) rotating targets: LH2, LD2, C, Fe, W
            %\item Iron-filled dipole magnet serves as beam dump; second dipole magnet is used for momentum measurement
            %\item Drift chambers for tracking, scintillator hodoscopes for trigger
    \end{itemize}
    \begin{center}
        \includegraphics[width=0.7\textwidth]{seaquest_setup}
    \end{center}
    %\column{0.35\textwidth}
    %\includegraphics[width=\textwidth]{st1_done_1000}
    %\end{columns}
\end{frame}

\begin{frame}{Production and signatures at SeaQuest}
    \begin{itemize}
        \item Three dominant production mechanisms: meson decay, proton bremsstrahlung, Drell-Yan
            %\begin{itemize}
        \item Prompt $A' \to \mu^+\mu^-$: bump-hunt
        \item Displaced $A' \to \mu^+\mu^-$: background suppressed by vertexing
        \item Displaced $A' \to e^+e^-$: background absorbed in dump
            %\end{itemize}
    \end{itemize}
    \begin{columns}
        %\column{0.35\textwidth}
        %\begin{center}
        %\includegraphics[width=\textwidth]{ProductionAprime}
        %\end{center}
        \column{0.3\textwidth}
        \includegraphics[width=\textwidth]{meson_decay}

        \includegraphics[width=\textwidth]{proton_bremsstrahlung}

        \includegraphics[width=\textwidth]{drell-yan}

        \column{0.55\textwidth}
        \begin{flushright}
            \includegraphics[width=\textwidth]{ProductionAprime}
        \end{flushright}

        %\includegraphics[width=\textwidth]{darkphoton-BR-1-3000-LOG}
    \end{columns}
\end{frame}

\begin{frame}{SeaQuest search for dark photons}
    \begin{columns}
        \column{0.7\textwidth}
        \begin{itemize}
            \item Dimuons in main SeaQuest dataset
                \begin{itemize}
                    \item Bump-hunt at high mass (ongoing effort)
                \end{itemize}
            \item Dimuon displaced-vertex trigger
                \begin{itemize}
                    \item Commissioned 2017, physics data soon
                \end{itemize}
            \item Dielectron trigger
                \begin{itemize}
                    \item EMCal for electron PID (in planning)
                \end{itemize}
                \begin{center}
                    \includegraphics[width=0.9\textwidth]{trigger_schematic}
                \end{center}
        \end{itemize}
        \column{0.3\textwidth}

        \includegraphics[width=\textwidth]{IMG_2459_1000}
    \end{columns}
    %\begin{center}
        %%\includegraphics[width=0.7\textwidth]{trigger_sketch}
        %%\includegraphics[width=0.7\textwidth]{st2_done_1000}
        %\includegraphics[width=0.7\textwidth]{displaced}
    %\end{center}
\end{frame}

\begin{frame}{Why SeaQuest?}
    \begin{columns}
        \column{0.6\textwidth}
        \begin{itemize}
            \item Most fixed-target dark photon experiments have thin targets or thick beam dumps (100s of meters)
            \item SeaQuest has:
                \begin{itemize}
                    \item Thin dump, just thick enough to absorb beam backgrounds
                    \item High beam energy (boosts the $A'$, so $\gamma c\tau$ gets through the dump)
                    \item Proton beam: many production channels and wide mass coverage
                \end{itemize}
            \item Strong support from theory groups for a broad dark sectors program at SeaQuest (arXiv:1804.00661)
        \end{itemize}
        %\begin{center}
        %\end{center}
        \column{0.4\textwidth}
        \includegraphics[width=\textwidth]{ProductionAprime}

        \includegraphics[width=\textwidth]{reach_differentchannels}
    \end{columns}
    %\begin{center}
    %\includegraphics[width=0.7\textwidth]{displaced}
    %\end{center}
\end{frame}

%dimuon commissioning run
\begin{frame}{Trigger logic}
    \begin{columns}
        \column{0.6\textwidth}
        \begin{itemize}
            \item Two levels of CAEN V1495 FPGA boards: identify displaced tracks, trigger on pairs
            \item L1: three-way coincidence within each quadrant
                \begin{itemize}
                    \item Identify displaced tracks ($z_0 \in [400,650]$ cm) in each quadrant using roads
                \end{itemize}
            \item L2: two-out-of-four coincidence between opposite-sign quadrants
            %\item In 2017, we wired this to NIM2
                %\begin{itemize}
                %\item Require pairs of displaced tracks, opposite sign
                %\item $z_0$ matching possible
                %\end{itemize}
                % acceptance: z=400 to 650 cm
                %\item Extruded scintillator bars detect charged particles, wavelength-shifting fibers collect light and transport it to the SiPMs
                %\item Station 1: four boxes, 80 1-cm bars each
                %\item Station 2: four boxes, 50 2-cm bars each
        \end{itemize}
        \begin{center}
            %\includegraphics[width=0.7\textwidth]{trigger_sketch}
            \includegraphics[width=0.8\textwidth]{trigger_schematic}
            %\includegraphics[width=0.7\textwidth]{st2_done_1000}
        \end{center}
        \column{0.4\textwidth}
        \includegraphics[width=\textwidth]{trigger_roads}
    \end{columns}
\end{frame}

\begin{frame}{Installation and commissioning}
    \begin{columns}
        \column{0.5\textwidth}
        \begin{itemize}
            \item Trigger hodoscopes installed spring 2017
            \item Detectors and trigger electronics tested and timed in
            \item 5 days of data taken with the displaced vertex trigger before summer shutdown
                \begin{itemize}
                    \item Confirmed expected trigger rate, and got lots of random-triggered data for trigger optimization
                    \item Incorrect trigger delay: no drift chamber tracks
                \end{itemize}
                %\item Expect O($10^{18}$) POT over the next two years, parasitic with new SeaQuest polarized target run
                % 8e15 protons on target
        \end{itemize}
        %\begin{center}
        %    \includegraphics[width=0.4\textwidth]{coincidence_2017-06-16}
        %    \hspace{0.1\textwidth}
        %    \includegraphics[width=0.4\textwidth]{triggerrate_ratio}
        %\end{center}
        \column{0.25\textwidth}
        \includegraphics[width=\textwidth]{IMG_2459_1000}

        \column{0.25\textwidth}
        \includegraphics[width=\textwidth]{IMG_2539_1000}
    \end{columns}
\end{frame}

\begin{frame}{Displaced dimuon plans}
    \begin{columns}
        \column{0.65\textwidth}
        \begin{itemize}
            \item Bad hodoscope channels repaired last year, hardware is ready to go
            \item Trigger logic should be optimized using real background data and improved signal MC
            \item Run dimuon dark photon search during E1039 commissioning and running
            \item Analysis should get a result quickly
                \begin{itemize}
                    \item Shoot for initial result (from first year's data) late 2019/early 2020
                \end{itemize}
        \end{itemize}
        %\begin{center}
        %\includegraphics[width=0.6\textwidth]{st2_done_1000}
        %\end{center}
        \column{0.35\textwidth}
        \includegraphics[width=\textwidth]{DSCN3836}
    \end{columns}
\end{frame}

\begin{frame}{EMCal upgrade for dielectron trigger}
    \begin{columns}
        \column{0.65\textwidth}
        \begin{itemize}
            \item One PHENIX EMCal sector: $2\times4$ m$^2$ wall of Pb-scintillator shashlyks
            \item Simple energy threshold can trigger on non-MIP particles
            \item Track matching enables electron ID (reject $K^0_L\to\pi^\pm e^\mp\nu_e$ mis-ID background)
            \item Requires some spectrometer reconfiguration --- must be installed after E1039 is done
        \end{itemize}
        \begin{center}
            \includegraphics[width=\textwidth]{emcal_location}
        \end{center}
        \column{0.35\textwidth}
        \includegraphics[width=\textwidth]{phenix_emcal}

        %\column{0.35\textwidth}
        %\includegraphics[width=\textwidth]{Visible_Aprime_Future}
    \end{columns}
\end{frame}

\begin{frame}{SeaQuest after E1039}
    \begin{center}
        \includegraphics[width=\textwidth]{fermilab_schedule}
    \end{center}
    \begin{itemize}
        \item NM4 is unscheduled after E1039: new NP program possible, or dedicated HEP dark sectors program?
        \item Dark photon searches can run in either scenario
    \end{itemize}
\end{frame}

%2020 - 2021 Planning for the EMCal upgrade (1 staff + 1 postdoc)
\begin{frame}{EMCal hardware status}
    \begin{columns}
        \column{0.65\textwidth}
        \begin{itemize}
            \item The two best sectors have been transferred (on paper) to LANL
            \item We have the full PHENIX readout system; investigating whether it can be directly reused for SeaQuest
                \begin{itemize}
                    \item Time structure (10 MHz vs. 53 MHz) is the main concern, but pileup is negligible
                    \item Alternative: STAR is developing an SiPM-based readout system with the same modules
                \end{itemize}
            \item We have a set of EMCal modules, with the full electronics chain, at LANL
                %\item HV uses LeCroy mainframes, will be loaned by BNL
                %\item LV used custom PHENIX supplies which are gone, looking at other options
                %\item Monitoring system: fibers and splitters are in place, probably use an LED light source in place of laser
                %\begin{itemize}
                %\item P
                %\end{itemize}
        \end{itemize}
        %\begin{center}
        %    \includegraphics[width=\textwidth]{emcal_location}
        %\end{center}
        \column{0.35\textwidth}
        \includegraphics[width=\textwidth]{phenix_emcal_module}

        \includegraphics[width=\textwidth]{star_electronics}
    \end{columns}
\end{frame}

\begin{frame}{EMCal upgrade plans}
    \begin{columns}
        \column{0.65\textwidth}
        \begin{itemize}
            \item Install a small number of modules in SeaQuest to measure background rates
            \item Develop MC to understand our efficiency for triggering on electrons
            \item Brainstorm additional dark sector searches possible at SeaQuest, possibly with additional hardware or spectrometer reconfiguration
            \item Work on a letter of intent, gather HEP collaborators
        \end{itemize}
        %\begin{center}
        %    \includegraphics[width=\textwidth]{emcal_location}
        %\end{center}
        \column{0.35\textwidth}
            \includegraphics[width=\textwidth]{loi}
    \end{columns}
\end{frame}

\begin{frame}{Help!}
        \begin{itemize}
            \item ``Our'' theorists are very excited about SeaQuest and will support us, but the experimental side needs help
            \item I'm going to SENSEI (direct detection, low-mass DM), E1039 is already very tight on manpower
            \item Our immediate need is manpower for dimuon trigger optimization and analysis, then EMCal studies
                \begin{itemize}
                    \item Half a grad student would make a big difference, with an immediate payoff
                \end{itemize}
            \item E1039 would love it if someone could help with detector commissioning while working on dark sector physics
            \item LANL group has no funding to work on this right now, though we have proposals in the pipe:
                \begin{itemize}
                    \item LANL LDRD
                    \item DOE HEP US-Japan program
                \end{itemize}
        \end{itemize}
        %\begin{center}
        %    \includegraphics[width=\textwidth]{emcal_location}
        %\end{center}
\end{frame}





\end{document}
