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- \title[{\color[rgb]{0, 0, 0}A preview of GAMBIT}]{\textcolor{black}{A preview of GAMBIT}}
- \author[Pat Scott -- April 2015 -- IFT Madrid]{Pat Scott}
- \institute{\small{Imperial College London}}
- \date[April 2015]{\small \centering on behalf of the GAMBIT Collaboration \\\cblue{\href{http://gambit.hepforge.org}{http://gambit.hepforge.org}}}
- \subject{Talks}
- \pgfdeclareimage[height=0.7cm]{university-logo}{Logo2}
- \logo{\pgfuseimage{university-logo}}
-
- \begin{document}
-
- \maketitle
-
- \begin{frame}
- \frametitle{Let's begin with dessert.}
-
- GAMBIT: The \alert{G}lobal \alert{A}nd \alert{M}odular \alert{B}SM \alert{I}nference \alert{T}ool
- \vspace{2mm}
-
- \visible<2->
- {
- \begin{exampleblock}{So what \textit{\textbf{is}} GAMBIT?}
- \visible<3->
- {
- 3 things:
- \visible<4->
- {
- \bi
- \item A collaboration of about thirty theorists and experimentalists
- \visible<5->{
- \item A new public global fitting code
- \visible<6->{
- \item A program of physics analyses that we're carrying out using the code}}
- \ei
- }
- }
- \end{exampleblock}
- }
-
- \visible<7->{
- \vspace{2mm}
- First physics results and code release in a few months\\
- (i.e.\ late summer \alert{this year})
- }
-
- \end{frame}
-
- \begin{frame}
- \frametitle{Outline}
- \begin{columns}[t]
- \column{0.8\textwidth}
- \tableofcontents[sections={1}]
- \vspace{3mm}
- \tableofcontents[sections={2}]
- \vspace{3mm}
- \tableofcontents[sections={3}]
- \end{columns}
- \end{frame}
-
- \section{The problem}
-
- \begin{frame}
- \frametitle{Combining searches {\rm I}}
-
- \begin{exampleblock}{Question}
- How do we know which models are in and which are out?
- \end{exampleblock}
-
- \visible<2->{
- \begin{block}{Answer}
- Combine the results from different searches
- \end{block}
-
- \begin{columns}[c]
- \column{0.5\textwidth}
- \footnotesize
- \begin{itemize}
- \item Simplest method: take different exclusions, overplot them, conclude things are ``allowed'' or ``excluded''
- \item Simplest BSM example: the scalar singlet model
- \vspace{1cm}
- \end{itemize}
- \column{0.45\textwidth}
- \includegraphics[width=\textwidth]{Fig6a}
- \column{0.10\textwidth}
- \end{columns}
- }
-
- \begin{textblock}{80}(10,75)
- \visible<2->{\tiny(Cline, Kainulainen, PS \& Weniger, \textit{PRD}, 1306.4710)}
- \end{textblock}
-
- \end{frame}
-
-
- \begin{frame}
- \frametitle{Combining searches {\rm II}}
-
- That's all well and good if there are only 2 parameters and few searches\ldots\vspace{3mm}
-
- \begin{exampleblock}{Question}
- What if there are many different \alert{constraints}?
- \end{exampleblock}
-
- \visible<2->
- {
- \begin{columns}[c]
- \column{0.4\textwidth}
- \begin{block}{Answer}
- Combine constraints in a statistically valid way \\$\rightarrow$ composite likelihood
- \end{block}\vspace{10mm}
- \column{0.45\textwidth}
- \includegraphics[width=\textwidth]{Fig3b}
- \end{columns}
- }
-
- \begin{textblock}{80}(20,75)
- \visible<2->{\tiny(Cline, Kainulainen, PS \& Weniger, \textit{PRD}, 1306.4710)}
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-
- \end{frame}
-
-
- \begin{frame}
- \frametitle{Combining searches {\rm III}}
-
- That's all well and good if there are only 2 parameters and few searches\ldots\vspace{3mm}
-
- \begin{exampleblock}{Question}
- What if there are many \alert{parameters}?
- \end{exampleblock}
-
- \visible<2->{
- \begin{block}{Answer}
- Need to
- \begin{itemize}
- \item scan the parameter space (smart numerics)
- \item interpret the combined results (Bayesian / frequentist)
- \item project down to parameter planes of interest (marginalise / profile)
- \end{itemize}
- $\rightarrow$ \alert{global fits}
- \end{block}}\vspace{3mm}
-
- \end{frame}
-
-
-
- \begin{frame}
- \frametitle{Beyond-the-Standard-Model Scanning}
-
- \alert{Goals:}
- \begin{enumerate}
- \item Given multiple theories, determine which fit the data better, and quantify how much better \visible<2->{\cblue{$\implies$ model comparison}}
- \item Given a particular theory, determine which parameter combinations fit all experiments, and how well \visible<2->{\\\hspace{5.15cm}\cblue{$\implies$ parameter estimation}}
- \end{enumerate}
- \vspace{4mm}
-
- \visible<3>{
- Why simple IN/OUT analyses are not enough\ldots
- \vspace{2mm}
- \small
- \begin{itemize}
- \item Only partial goodness of fit, no measure of convergence, no idea how to generalise to regions or whole space.
- \item Frequency/density of models in IN/OUT scans is \\\alert{not} proportional to probability $\implies$ no statistical meaning.
- \item $\rightarrow$ statements about a theory's general ability to do one thing or another, based on such scans, are statistically invalid
- \end{itemize}
- \vspace{2mm}
- }
-
- \end{frame}
-
-
-
- \section{Future challenges}
-
- \begin{frame}
- \frametitle{The LHC likelihood monster}
-
- \begin{textblock}{30}(80.6,10.2)
- \includegraphics[width=\linewidth]{LHCmonster}
- \end{textblock}
-
- \visible<1->{
- \begin{exampleblock}{Time per point:}
- $\mathcal{O}(minute)$ in \alert{best} cases
- \end{exampleblock}
- }
-
- \visible<2->{
- \begin{exampleblock}{Time per point for global fits to converge:}
- $\mathcal{O}(seconds)$ in \alert{worst} cases
- \end{exampleblock}
- }
-
- \visible<3->{
- \begin{exampleblock}{Challenge:}
- About 2 orders of magnitude too slow to actually include LHC data in global fits properly
- \end{exampleblock}
- }
-
- \visible<4->{
- \vspace{2mm}
- \alert{$\rightarrow$ More in Martin's presentation}
- }
-
- \end{frame}
-
- \begin{frame}
- \frametitle{Doing genuinely `model-independent' DM pheno}
-
- \visible<1->{
- \begin{exampleblock}{All experimental limits in terms of simplified models: effective WIMP, one annihilation channel, etc}
- $\implies$ need something to apply limits to arbitrary DD couplings and ID decay/annihilation branching fractions\\
- $\implies$ must include accurate treatment of experimental effects
- \end{exampleblock}
- }
-
- \visible<2->{
- \begin{exampleblock}{Impacts of new unstable particles (e.g. extra Higgs) are hard}
- $\implies$ need to simulate decays `on the fly'
- \end{exampleblock}
- }
-
- \visible<3->{
- \begin{exampleblock}{Calculating relic densities for general models also challenging}
- $\implies$ want to feed in partial annihilation rates, co-annihilations, resonances, etc (not only set up model in LanHEP)
- \end{exampleblock}
- }
-
- \visible<4->{
- \vspace{2mm}
- \alert{$\rightarrow$ nulike, gamlike, DDcalc, cascade sim $\rightarrow$ Christoph's talk}
- }
-
- \end{frame}
-
-
- \begin{frame}
- \frametitle{Parameter space $\rightarrow$ Theory space}
-
- \alert{CMSSM, MSSM, Simplified Models $\ne$ BSM}
- \vspace{3mm}
-
- Want to do model comparison to actually work out which theory is the best\ldots
- \vspace{3mm}
-
- \begin{exampleblock}{Challenge:}
- How do I easily adapt a global fit to different BSM theories?
- \end{exampleblock}
-
- \visible<2>{
- Somehow, we must recast things quickly to a new theory
- \begin{itemize}
- \item data
- \item likelihood functions
- \item scanning code `housekeeping'
- \item even predictions
- \end{itemize}
- $\implies$ a new, very abstract global fitting framework
- }
-
- \end{frame}
-
- \begin{frame}
- \frametitle{Hitting the wall}
-
- Issues with current global fit codes:
- \begin{itemize}
- \item Strongly wedded to a few theories (e.g. constrained MSSM / mSUGRA)
- \item Strongly wedded to a few theory calculators
- \item All datasets and observables basically hardcoded
- \item Rough or non-existent treatment of most experiments (astroparticle + collider especially)
- \item Sub-optimal statistical methods / search algorithms
- \item $\implies$ \textit{already hitting the wall on theories, data \& computational methods}
- \end{itemize}
-
- \end{frame}
-
- \section{Future solutions}
-
- \begin{frame}
- \frametitle{\textbf{GAMBIT}: a \textit{second-generation} global fit code}
-
- GAMBIT: \alert{G}lobal \alert{A}nd \alert{M}odular \alert{B}SM \alert{I}nference \alert{T}ool
- \vspace{5mm}
-
- Overriding principles of GAMBIT: flexibility and modularity
- \begin{itemize}
- \item General enough to allow fast definition of new datasets and theoretical models
- \item Plug and play scanning, physics and likelihood packages
- \item Extensive model database -- not just small modifications to constrained MSSM (NUHM, etc), and not just SUSY!
- \item Extensive observable/data libraries (likelihood modules)
- \item Many statistical options -- Bayesian/frequentist, likelihood definitions, scanning algorithms
- \item A smart and \textit{fast} LHC likelihood calculator
- \item Massively parallel
- \item Full open-source code release
- \end{itemize}
-
- \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\\
- & \alert<2>{P.\ Scott}\vspace{0.5mm}\\
- \textbf{ATLAS} & A.\ Buckley, P.\ Jackson, C.\ Rogan,\\
- & A.\ Saavedra, \alert<2>{M.\ White}\vspace{0.5mm}\\
- \textbf{CTA} & C. Bal\'azs, T.\ Bringmann, \\
- & J.\ Conrad, \alert<2>{M.\ White}\vspace{0.5mm}\\
- \textbf{HESS} & J.\ Conrad \vspace{0.5mm}\\
- \textbf{LHCb} & M.\ Chrz\c{a}szcz, N.\ Serra\vspace{0.5mm}\\
- \textbf{IceCube} & J.\ Edsj\"o, C.\ Savage, \alert<2>{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, \\
- & \alert<2>{J.\ Cornell}, L.\ Dal, J.\ Edsj\"o, \alert<2>{B.\ Farmer},\\
- & A.\ Krislock, A.\ Kvellestad, M.\ Pato, \\
- & F.\ Mahmoudi, A.\ Raklev, C.\ Savage,\\
- & \alert<2>{P.\ Scott}, \alert<2>{C.\ Weniger}, \alert<2>{M.\ White} \\
- \end{tabular}
- \column{0.4\textwidth}
- \end{columns}
-
- \begin{textblock}{45}(73,13)
- \includegraphics[width=\linewidth]{Logo2full}\\
- \includegraphics[width=\linewidth]{GroupPhoto}
- \end{textblock}
-
- \end{frame}
-
- \begin{frame}
- \frametitle{Modules}
-
- Physics Modules
- \begin{itemize}
- \corange{\item ColliderBit} (Martin's talk)
- \corange{\item DarkBit} (Christoph's talk)
- \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}
-
- \bi
- \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)
- \ei
-
- \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}
-
- \uncover<1>
- {
- \bi
- \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
- \ei
- }
-
- \visible<1>
- {
- \includegraphics[width=\textwidth]{GAMBIT_active_functor_graph}
- }
-
- \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}
-
- \bi
- \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}
- \ei
-
- \includegraphics[width=0.8\textwidth]{GAMBIT_model_hierarchy}
-
- \end{frame}
-
- \begin{frame}
- \frametitle{Interface: yaml file}
-
- Basic interface for a scan is a YAML initialisation file
- \begin{columns}
- \column{0.6\linewidth}
- \bi
- \item[-] \alert<2>{specify parameters, ranges, priors}
- \item[-] \alert<3>{select likelihood components}
- \item[-] \alert<3>{select other observables to calculate}
- \item[-] \alert<4>{define generic rules for how to fill dependencies}
- \item[-] \alert<4>{define generic rules for options to be passed to module functions}
- \item[-] \alert<5>{set global options (scanner, errors/warnings, logging behaviour, etc)}
- \ei
- \column{0.5\linewidth}
- \includegraphics[width=1.2\textwidth]{yamlshot}
- \end{columns}
-
- \begin{textblock}{20}(55,20)
- \visible<2>
- {
- \begin{tikzpicture}
- \draw[color=red,line width=0.07cm]
- (0,0) ellipse (3.0 and 0.8);
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-
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- \visible<3>
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- \begin{tikzpicture}
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- (0,0) ellipse (3.0 and 1.2);
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- }
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-
- \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}\bi
- \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
- \ei
- \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}
- \bi
- \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
- \ei
- \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}
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- \end{frame}
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- \begin{frame}
- \frametitle{Closing remarks}
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- \begin{itemize}
- \item{Robust analysis of dark matter and BSM physics requires multi-messenger global fits}
- \item{GAMBIT is coming:}\bi
- \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}
- \ei
- \end{itemize}
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- \end{frame}
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- \begin{frame}
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- \begin{textblock}{100}(0,-0.5)
- \includegraphics[width=1.19\linewidth]{GAMBIT_wordle}
- \end{textblock}
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- \end{frame}
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- \end{document}
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