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\author{ {\fontspec{Trebuchet MS}Marcin Chrz\k{a}szcz} (Universit\"{a}t Z\"{u}rich, IFJ PAN)}
\institute{UZH}
\title[Introduction to GAMBIT]{Introduction to GAMBIT}



\begin{document}
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{
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\begin{center}
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			\flushright\fontspec{Trebuchet MS}\bfseries \Huge {Introduction to GAMBIT}
		\end{column}
                \begin{column}{0.02\textwidth}
                  {~}
                  \end{column}
                \begin{column}{0.23\textwidth}
                 % \hspace*{-1.cm}
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                  \includegraphics[width=0.6\textwidth]{lhcb-logo}
                  \end{column}
	        
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	\quad
	\vspace{3em}
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\begin{column}{0.44\textwidth}
\flushright \vspace{-1.8em} {\fontspec{Trebuchet MS} \Large Marcin Chrząszcz\\\vspace{-0.1em}\small \href{mailto:mchrzasz@cern.ch}{mchrzasz@cern.ch}}

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\vspace{1em}
		\footnotesize\textcolor{gray}{Universit\"{a}t Z\"{u}rich, \\ Institute of Nuclear Physics, Polish Academy of Science}\normalsize\\
\vspace{0.5em}

	\textcolor{normal text.fg!50!Comment}{KEK meeting, KEK\\October 29, 2015}
\end{center}
\end{frame}
}




\begin{frame}
\frametitle{The GAMBIT Collaboration}

26 Members, 15 institutions, 9 countries \\
8 Experiments, 4 major theory codes \vspace{2mm}

\scriptsize
\begin{columns}
\column{0.7\textwidth}
\begin{tabular}{l l}
\textbf{Fermi-LAT} &  J.\ Conrad, J.\ Edsj\"o, G.\ Martinez\\
                   & P.\ Scott\vspace{0.5mm}\\
\textbf{ATLAS} &  A.\ Buckley, P.\ Jackson, C.\ Rogan,\\
               & A.\ Saavedra, M.\ White\vspace{0.5mm}\\
\textbf{CTA} &  C. Bal\'azs, T.\ Bringmann, \\
             & J.\ Conrad, M.\ White\vspace{0.5mm}\\
\textbf{HESS} &  J.\ Conrad \vspace{0.5mm}\\
\textbf{LHCb} &  M.\ Chrzaszcz, N.\ Serra\vspace{0.5mm}\\
\textbf{IceCube} &  J.\ Edsj\"o, C.\ Savage, P.\ Scott\vspace{0.5mm}\\
\textbf{AMS-02} &  A.\ Putze\vspace{0.5mm}\\
\textbf{CDMS, DM-ICE} &  L. Hsu\vspace{0.5mm}\\
\textbf{XENON/DARWIN} &  J.\ Conrad\vspace{0.5mm}\\
\textbf{Theory} &  P.\ Athron, C. Bal\'azs, T.\ Bringmann, \\
                & J.\ Cornell, L.\ Dal, J.\ Edsj\"o, B.\ Farmer,\\
                & A.\ Krislock, A.\ Kvellestad, M.\ Pato, \\
                & F.\ Mahmoudi, A.\ Raklev, C.\ Savage,\\
                & P.\ Scott, C.\ Weniger, M.\ White \\	
\end{tabular}
\column{0.4\textwidth}



  \includegraphics[width=\linewidth]{Logo2full}\\	
  \includegraphics[width=\linewidth]{images/GroupPhoto.jpg}

\end{columns}
\end{frame}

\begin{frame}
\frametitle{Modules}

Physics Modules
\begin{itemize}
\corange{\item ColliderBit} ATLAS and CMS likelihoods
\corange{\item DarkBit} Dark Matter searches
\corange{\item FlavBit} -- flavour physics inc. $g-2$, $b\rightarrow s\gamma$, $B$ decays (new channels, theory uncerts, LHCb likelihoods)
\corange{\item SpecBit} -- generic BSM spectrum object, providing RGE running, masses, mixings, etc via interchangeable interfaces to different RGE codes
\corange{\item DecayBit} -- decay widths for all relevant SM \& BSM particles
\corange{\item EWPOBit} -- precision tests (mostly by interface to FeynHiggs, alt. SUSY-POPE)
\end{itemize}

+\corange{ScannerBit}: manages statistics, parameter sampling and optimisation algorithms

\end{frame}


\begin{frame}
\frametitle{Backends: mix and match}

\begin{itemize}

\item GAMBIT modules consist of a number of standalone \textbf{module functions}
\item Module functions can depend on each other, or they can require specific functions from \textbf{backends}
\item Backends are external code libraries (DarkSUSY, FeynHiggs, etc) that include different functions 
\item GAMBIT automates and abstracts the interfaces to backends $\rightarrow$ backend functions are tagged according to \alert{what they calculate}
\item $\rightarrow$ with appropriate module design, \alert{different backends and their functions can be used interchangeably}
\item GAMBIT dynamically adapts to use whichever backends are actually present on a user's system (+ provides details of wtf it did of course)
\end{itemize}

\only<2>{
\begin{textblock}{110}(10,30)
\includegraphics[width=\textwidth]{backendshot}
\end{textblock}
}

\end{frame}

\begin{frame}
\frametitle{GAMBIT: a toy example}
\centering
\includegraphics[width=0.9\textwidth]{coreChainDiagram_example_wlogo}	
\end{frame}

\begin{frame}
\frametitle{Dependency Resolution}


 \begin{itemize}
    \item Module functions and backend functions get arranged into a \textbf{dependency tree}
    \item Starting with requested observables and likelihoods, fills each dependency and backend requirement
    \item Obeys rules at each step: allowed models, allowed backends, constraints from input file, etc
    \item $\rightarrow$ tree constitutes a directed acyclic graph
    \item $\rightarrow$ GAMBIT uses graph-theoretic methods to `solve' the graph to determine function evaluation order
\end{itemize}





\only<2>{
\begin{textblock}{73}(45,17)
\includegraphics[width=\textwidth, trim = 0 0 8000 0, clip=true]{GAMBIT_active_functor_graph}
\end{textblock}
}

\end{frame}


\begin{frame}
\frametitle{Hierarchical Model Database}

\begin{itemize}
  \item Models are defined by their parameters and relations to each other
  \item Models can inherit from \textbf{parent models}
  \item Points in child models can be \textbf{automatically translated} to ancestor models
  \item \textbf{Friend models} also allowed (cross-family translation)
  \item Model dependence of every module/backend function is tracked $\implies$ \alert{maximum safety, maximum reuse}
\end{itemize}

\includegraphics[width=0.8\textwidth]{GAMBIT_model_hierarchy}

\end{frame}



\begin{frame}
\frametitle{Expansion: adding new functions}

Adding a new module function is easy:
\begin{enumerate}
\item Declare the function to GAMBIT in a module's \textbf{rollcall header}\begin{itemize}
  \item Choose a capability
  \item Declare any \textbf{dependencies}
  \item Declare any \textbf{backend requirements}
  \item Declare any specific \textbf{allowed models}
  \item other more advanced declarations also available
\end{itemize}
\includegraphics[width=\textwidth]{rollcallshot}
\item Write the function as a simple C$++$ function\\(one argument: the result)
\end{enumerate}


\end{frame}

\begin{frame}
\frametitle{Other nice technical features}
\begin{itemize}
\item \textbf{Scanners}: MultiNest, Diver (diff.\ evolution), PIKAIA (genetic algorithms), GreAT (MCMC)
\item \textbf{Statistics}: Bayesian, Profile Likelihood, later full Neyman
\item Mixed-mode \textbf{MPI + openMP}, mostly automated
\item diskless generalisation of various Les Houches Accords
\item \textbf{BOSS}: dynamic loading of C++ classes from backends (!)
\item \textbf{all-in or module standalone} modes -- easily implemented from single cmake script
\item \textbf{automatic getters} for obtaining, configuring + compiling backends\footnote{if a backend breaks, won't compile and/or kills your dog, blame the\\\protect{\hspace{5mm}} authors (not us\ldots unless we \textbf{are} the authors\ldots)}  
\item \textbf{flexible output streams} (ASCII, databases, binary, \ldots)
\item more more more\ldots
\end{itemize}
\end{frame}

\begin{frame}
\frametitle{GAMBIT vs the rest -- in a nutshell}

\begin{columns}
\column{1.13\linewidth}

\tiny
\begin{tabular}{p{12mm}|p{36mm}|p{13mm}|p{13mm}|p{12mm}|p{12mm}}
\hline
Aspect & GAMBIT & MasterCode & SuperBayeS & Fittino & Rizzo et al. \\
\hline
\corangewhen{Design}{<2>} & \corangewhen{Modular, Adaptive}{<2>} & Monolithic & Monolithic & ($\sim$)Monolithic & Monolithic \\
\corangewhen{Statistics}{<3>} & \corangewhen{Frequentist, Bayesian}{<3>} & Frequentist & Freq./Bayes. & Frequentist & None \\
\corangewhen{Scanners}{<4>} & \corangewhen{Differential evolution, genetic algorithms, random forests, t-walk, t-nest, particle swarm, nested sampling, MCMC, gradient descent}{<4>} & Nested sampling, MCMC, grad.\ descent & Nested sampling, MCMC & MCMC & None (random) \\
\corangewhen{Theories}{<5>} & \corangewhen{(p)MSSM-25, CMSSM$\pm$$\epsilon$, GMSB, AMSB, gaugino mediation, E6MSSM, NMSSM, BMSSM, PQMSSM, effective operators, iDM, XDM, ADM, UED, Higgs portals/extended Higgs sectors}{<5>} & CMSSM$\pm$$\epsilon$ & (p)MSSM-15, CMSSM$\pm$$\epsilon$, mUED & CMSSM$\pm$$\epsilon$ & (p)MSSM-19 \\
\corangewhen{Astroparticle}{<6>} & \corangewhen{Event-level: IceCube, Fermi, LUX, XENON, CDMS, DM-ICE. Basic: $\Omega_{\rm DM}$, AMS-02, COUPP, KIMS, CRESST, CoGeNT, SIMPLE, PAMELA, Planck, HESS. Predictions: CTA, DARWIN, GAPS}{<6>}  & Basic: $\Omega_{\rm DM}$, LUX, XENON & Basic: $\Omega_{\rm DM}$, Fermi, IceCube, XENON & Basic: $\Omega_{\rm DM}$, Fermi, HESS, XENON & Event-level: Fermi.\newline Basic: $\Omega_{\rm DM}$, IceCube, CTA \\
\corangewhen{LHC}{<7>} & \corangewhen{ATLAS+CMS multi-analysis with neural net and fast detector simulation.  Higgs multi-channel with correlations and no SM assumptions. Full flavour inc. complete $B\to X_sll$ and $B\to K^*ll$ angular set.}{<7>} & ATLAS resim, HiggsSignals, basic flavour. & ATLAS direct sim, Higgs mass only, basic flavour. & ATLAS resim, HiggsSignals, basic flavour. & ATLAS+CMS\newline+Tevatron direct sim, basic flavour. \\
\corangewhen{SM, theory and related uncerts.}{<8>} & \corangewhen{$m_t$, $m_b$, $\alpha_{\rm s}$, $\alpha_{\rm EM}$, DM halo, hadronic matrix elements, detector responses, QCD+EW corrections (LHC+DM signal+BG), astro BGs, cosmic ray hadronisation, coalescence and p'gation.}{<8>} & $m_t$, $m_Z$, $\alpha_{\rm EM}$, hadronic matrix elements & $m_t$, $m_b$, $\alpha_{\rm s}$, $\alpha_{\rm EM}$, DM halo, hadronic matrix elems. & $m_t$ & None \\
\hline
\end{tabular}
\end{columns}

\end{frame}

\begin{frame}
\frametitle{Closing remarks}

\begin{itemize}
\item{Robust analysis of dark matter and BSM physics requires multi-messenger global fits}
\item{GAMBIT is coming:}\begin{itemize}
\item[$\rightarrow$]{Global fits to many models for the first time}
\item[$\rightarrow$]{Better global fits to familiar ones}
\item[$\rightarrow$]{Highly modular, usable and extendable public code}
\item[$\rightarrow$]{Faster, more complete and more consistent theory explorations + experimental analysis prototyping} 
\end{itemize}
\end{itemize}

\end{frame}


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