TOOLS08

30 Jun 2008, 09:00 → 4 Jul 2008, 14:30 Europe/Berlin

Max-Planck-Institut für Physik (Werner-Heisenberg-Institut)

Ariane Frey (Werner-Heisenberg-Institut), Fawzi Boudjema, G. Belanger (LAPP Annecy), Georg Raffelt (Max-Planck Institut für Physik), Hollik Wolfgang (MPI Munchen), Siegfried Bethke (Max-Planck-Institut fur Physik), Stefan Dittmaier (MPI fuer Physik), Stefano Moretti (Unknown), Thomas Hahn (MPI Munich)

TOOLS 2008, Tools for the New Physics and its Background, will take place from June 30th to July 4th at the Max-Planck-Institut für Physik in Munich, Germany. The aim of the Workshop is to review the main calculational tools, such as generators and Monte Carlos, for searches of the New Physics at present and future colliders as well as in non-collider physics experiments such as dark-matter searches. Issues and codes pertaining to the background will also be covered. The workshop is structured around (i) a series of talks (with and without software demo), (ii) tutorials, and (iii) round-table discussions. The talks give an overview of available tools, the tutorials convey hands-on information of the main packages, and in the round-table discussions we hope to discuss how the existing programs could be improved, how to incorporate different existing constraints, how to best present future data, and how modules from different codes could be sewn together and interchanged.

Slides schuster.pdf

Monday 30 June

09:00 → 10:30 Registration

10:30 → 11:15 Coffee break

11:15 → 13:00 Session 2

Convener: Wolfgang Hollik (MPI Munich)

11:15 Welcome

11:30 Overview talk: Introduction to the conference

Speaker: Michael Peskin (SLAC)

Slides Peskin-Tools08.pdf

12:30 Parameter estimation with Markov Chain Monte Carlo techniques

In the field of cosmology, the analysis of observational data with Bayesian methods is wide-spread. Only fairly recently it was suggested to apply these methods also to particle physics, to constrain the free parameters of supersymmetric models such as the CMSSM. The technical challenge of these analyses lies in the need to accurately sample a multi-dimensional parameter space in a reasonable amount of time. Markov Chain Monte Carlo (MCMC) algorithms offer an elegant solution to this problem. I will give a brief introduction to the theory of MCMC and illustrate its applications with a few examples from the recent literature.

Speaker: Jan Hamann (Unknown)

Slides tools2008_hamann.pdf

13:00 → 14:30 Lunch

14:30 → 15:30 Session 3

Convener: Michael Kraemer (RWTH Aachen)

14:30 Development of CalcHEP program

Talk present recent development of CalcHEP program for automatic calculation of matrix elemnts, integration over phase space and event generation.

Speaker: Alexander Pukhov

Slides pukhov.pdf

15:05 Collider phenomenology of minimal walking technicolor

I present collider phenomenology and LHC signatures of the (Next to) Minimal Walking Technicolor models. The study is based on our implementation of the models into Calchep. I will also comment on work in progress implementing the model in Sherpa.

Speaker: Mads Toudal Frandsen (Unknown)

Slides frandsen.pdf

15:30 → 16:00 Coffee break

16:00 → 18:00 Session 4

Convener: Thomas Hahn (MPI Munich)

16:00 FeynRules - Feynman rules made easy

The hunt for new physics at the LHC will bring up new challenges on both the theoretical and experimental side. Many tools, symbolical and numerical, are available nowadays to facilitate the communication between theorists and experimentalists involved in this hunt. However, the implementation of new physics models into the existing tools is a rather tedious work. I present a new tool called FeynRules, a Mathematica package to derive Feynman rules directly from a lagrangian. I will review the main features of the code and the algorithm, and in particular how the package can be interfaced to other existing tools for phenomenological studies

Speaker: Claude Duhr (UCL)

Slides FeynRules_Duhr.pdf

16:25 BSM phenomenology with FeynRules

As the LHC turns on, and our theoretical models prepare to confront data, we need to be prepared to implement various models in monte carlo event generators for comparison. There is a large number of monte carlo generators on the market including CalcHEP/CompHEP, MadGraph, Sherpa, Herwig, Whizard and others. Each of these tools has different strengths and weaknesses and so it would be ideal if we could use each tool for the job it is best suited. In the recent past implementing a new model in just one of these event generators was a tedious and error prone task, in many cases requiring programming skills. Furthermore, once you finished building a model in one monte carlo package, it was not transferable to another and you had to start nearly from scratch. FeynRules is a Mathematica package which aims to overcome this challenge. The user of FeynRules implements a model in the FeynRules format. The lagrangian can be written in Mathematica notation in a form that is "close" to the way you write the lagrangian on paper. FeynRules then reads this FeynRules model-file, creates the Feynman rules and stores the information in a monte carlo program independent format. This information is then general enough to be used by any monte carlo package as well as symbolic packages and TeX. All that is necessary is a translation to the respective language. Such translation interfaces have been written for TeX, FeynArts, MadGraph, Sherpa, and CalcHEP/CompHEP. We hope to add interfaces to other monte carlos in the future.

Speaker: Neil Christensen

Slides FeynRules-Interfaces.pdf.pdf

17:00 Tutorial 1: LanHEP

The LanHEP program for Feynman rules generation is presented. It reads the Lagrangian written in the compact form close to one used in publications. It means that Lagrangian terms can be written with summation over indices of broken symmetries and using special symbols for complicated expressions, such as covariant derivative and strength tensor for gauge fields. The output is Feynman rules in terms of physical fields and independent parameters. This output can be written in LaTeX format and in the form of CompHEP model files, which allows one to start calculations of processes in the new physical model. Feynarts format output is also available now.

Speaker: Andrey Semenov (JINR)

Tuesday 1 July

09:00 → 10:40 Session 1

Convener: Stefano Moretti (Southampton Univ.)

09:00 Overview talk: Experimental usage, needs and issues

Speaker: Gustaaf Brooijmans (Columbia University)

Slides experiment.pdf

10:05 BSM physics in Herwig++

I will describe the Beyond the Standard Model physics implemented in the Herwig++ generator including the automatic generation of the hard process, two- and three-body decays and our treatment of off-shell effects.

Speaker: Dr Peter Richardson (Durham University)

Slides Tools08.pdf Tools08.ppt

10:40 → 11:10 Coffee break

11:10 → 13:00 Session 2

Convener: Andre Hoang (MPI Munich)

11:10 SusyBSG: a fortran code for BR[B->Xs gamma] in the MSSM with minimal flavor violation

We present the fortran code SusyBSG version 1.1, which computes the branching ratio for the decay B -> Xs gamma in the MSSM with Minimal Flavor Violation. The computation takes into account all the available NLO contributions, including the complete supersymmetric QCD corrections to the Wilson coefficients of the magnetic and chromomagnetic operators.

Speaker: Pietro Slavich (Unknown)

Slides slavich.pdf

11:35 SuperIso and flavor constraints on supersymmetric models

SuperIso is a program dedicated to indirect constraint calculations in the MSSM, and in particular those associated to b -> s gamma transitions, providing for example the isospin asymmetry associated to these transitions at NLO accuracy and the branching ratio at NNLO. In this talk, I will present the most important features and the new developments of SuperIso, as well as some of the resulting constraints.

Speaker: Dr Farvah Nazila Mahmoudi (Mount Allison University)

Slides nazila.pdf

12:00 HiggsBounds: confronting models with an arbitrary number of neutral Higgs bosons with LEP & Tevatron results

From the Higgs search at LEP and the Tevatron, limits on topological cross sections, which can be applied to a large class of models, have been derived or, in the case of the Tevatron, are still updated. Developed in collaboration with P. Bechtle, S. Heinemeyer, G. Weiglein, K. Williams, our code can decide for models with an arbitrary number of neutral Higgs bosons, with given deviations from the Standard Model Higgs production cross sections and decay branching ratios, whether it is excluded at the 95% C.L. or not. This is a very useful tool for phenomenologists and model builders alike, allowing on the one hand to have easy access to up-to-date parameter restrictions, e.g. for the MSSM, and on the other hand to confront new models of the Higgs sector with detailed constraints. There is a FORTRAN version of the code, useful to obtain individual plots or model parameter scans, and an on-line version which is currently being set up. For the MSSM we also provide interfaces to the spectrum calculators FeynHiggs and CPsuperH.

Speaker: Dr Oliver Brein (IPPP, Durham)

Slides HiggsBounds.pdf

12:35 A framework for consistent combination of indirect constraints on the MSSM

Already today, low-energy data from flavour physics experiments, high precision electroweak observables as well as astrophysical data impose strong constraints on many new physics (NP) scenarios. In order to quantify the agreement of a particular NP model with the existing experimental measurements, a consistent set of theory predictions has to be provided. A common "MasterCode" to combine the different calculations has been set up by a collaboration of experimentalists and theorists from various fields. This package integrates state-of-the-art calculations of low-energy physics, electroweak and astroparticle observables in the minimal supersymmetric standard model (MSSM). It was recently updated to accommodate different constrained versions of the MSSM, while the list of flavour physics observables was significantly enlarged. Using this tool, we carry out multidimensional \chi^2 scans of the MSSM parameter space based on Markov Chain Monte Carlo. The results of this study indicate that already today's experimental data allows to place tight constraints on the MSSM. Furthermore, we evaluate the importance of several observables by investigating how the deviation from the Standard Model expectation and the uncertainty of the experimental measurement influence the allowed MSSM parameter space. In this talk we present the results of the above studies and outline the design and usage of the "MasterCode".

Speaker: Dr Henning Flaecher (Royal Holloway, University of London)

Slides flaecher.pdf

13:00 → 14:30 Lunch

14:30 → 15:30 Session 3

Convener: Thorsten Ohl (Univ. Wuerzburg)

14:30 The OPP method - towards NLO automation

I will briefly review the OPP method for the reduction of one loop amplitudes at the integrand level. As a first application the full NLO corrections to tri-boson production at the LHC will be presented, based on CuTTools and HELAC-PHEGAS matrix element generator. Finally I will discuss the different strategies towards an automatic generator at the NLO level.

Speaker: Costas Papadopoulos (Institute of Nuclear Physics)

Slides tools2008.pdf

15:00 BSM with CompHEP

New options of the CompHEP package for computing and simulating processes in models beyond SM are discussed.

Speaker: Eduard Boos (Institute for Nuclear Physics)

Slides boos.pdf

15:30 → 16:00 Coffee break

17:15 → 18:15 Colloquium

17:15 Neutrinos: Results and Future

We will review what has been learned about neutrino mass and mixing, including the latest results. We will then discuss some of the major open neutrino questions, explaining why they are interesting, and describing strategies for answering them through future experiments. The question of whether neutrinos are their own antiparticles, and the related search for neutrinoless double beta decay, will receive heavy emphasis.

Speaker: Boris Kayser

Wednesday 2 July

09:00 → 10:30 Session 1

Convener: Stefan Dittmaier (MPI Munich)

09:00 Overview talk: Backgrounds and SM Tools at the LHC

Speaker: Michael Kraemer (Particle Physics)

Slides kraemer.pdf

10:05 MC for BSM with Pythia 8

This presentation will give a status report of the BSM processes available in Pythia 8. The features most relevant for BSM physics are summarized and a graviton study will be discussed as an example of how a so-called semi-internal process can be used to implement a new BSM process.

Speaker: Stefan Ask (European Organization for Nuclear Research (CERN))

Slides Ask_Tools08.pdf

10:30 → 11:00 Coffee break

11:00 → 13:00 Session 2

Convener: Sven Heinemeyer (IFCA (CSIC-UC), Santander)

11:00 Status and new features of the event generator WHIZARD

We give a status report on the new WHIZARD version 2.0.0, along with a tutorial on the installation and usage of the program. The WHIZARD event generator is a multi-purpose event generator for multi-particle reactions at future colliders, especially for the LHC. We review both technical details of the most recent version and show its versatility with an overview over the most recent applications of the program.

Speaker: Prof. Juergen Reuter (University of Freiburg)

Slides tools08.pdf

11:35 NLO event generation for chargino production at the ILC

We present an extension of the Monte Carlo Event Generator Whizard which includes chargino production at the ILC at NLO. We include photons using both a fixed order and a resummation approach. While the fixed order approach suffers from negative event weights, the resummation method solves this problem and automatically includes leading higher order corrections. We present results for cross sections and event generation for both methods and evaluate the systematic errors due to soft and collinear approximations. In the resummation approach, the residual uncertainty can be brought down to the per-mil level.

Speaker: Dr Tania Robens (RWTH Aachen, Institut fuer Theoretische Physik E)

Slides tr_tools08.pdf

12:00 Round table: Colliders

13:00 → 14:30 Lunch

14:30 → 15:30 Session 3

Convener: Thomas Hahn (MPI Munich)

14:30 Tutorial 2: Madgraph

Speaker: Fabio Maltoni (Unknown)

Slides maltoni-tools-2008.pdf

15:30 → 16:00 Coffee break

16:00 → 18:00 Session 4

Convener: Juergen Reuter (Univ. Freiburg)

16:00 BSM physics with Sherpa

I will review the capabilities of the Sherpa Monte Carlo generator for simulating beyond the Standard Model physics. Special emphasis will be given to the newly developed interface to the FeynRules packages. This allows to input model parameters and interaction vertices, needed for matrix element calculations, in a very simple way.

Speaker: Steffen Schumann

Slides schumann.pdf

16:30 Weighting di-boson Monte Carlo events in hadron colliders

A detailed study of the di-boson Monte Carlo programs Pythia, MC@NLO and the program of Baur, Han and Ohnemus (BHO) is performed. None of these programs cover all aspects of di-boson production. The BHO code is used to produce event weights emulating anomalous triple gauge couplings in Pythia and MC@NLO events. In the same way, boson spin information which is missing for most di-boson channels in MC@NLO can be introduced as well. This weighting code can be used to study systematic effects related to various aspects of the Monte Carlo generators, e.g. parton distribution functions. A detailed study comparing distributions of event samples generated with these three generators shows a nice agreement for events without jets. Some differences between the three samples are observed for events with jets. Most of these differences can be attributed to the different ways of jet production in the three programs.

Speaker: Gideon Bella (High Energy Physics Department)

Slides dibosmc.pdf dibosmc.ppt

17:00 Tutorial 3: Sherpa

Speaker: frank krauss (Durham University)

Slides krauss_showers.pdf krauss_start.pdf

Thursday 3 July

09:00 → 10:30 Session 1

Convener: Fabio Maltoni (Louvain Univ.)

09:00 Overview talk: Dark Matter

Speaker: Paolo Gondolo

Slides gondolo.pdf

10:05 Dark-matter tools

Speaker: Fiorenza Donato

Slides donato.pdf donato.ppt

10:30 → 11:00 Coffee break

11:00 → 13:00 Session 2

Convener: Michael Peskin (SLAC)

11:00 DarkSUSY 5.0

DarkSUSY is a program package to perform calculations of relic density and various signals for direct and indirect searches, especially for supersymmetric dark matter. The new release of DarkSUSY with many improvements will be released and discussed.

Speaker: Joakim Edsjo

DarkSUSY Online http://copsosx03.physto.se/dsweb42.html

DarkSUSY web http://www.physto.se/~edsjo/darksusy

Slides 080703-DarkSUSY-tools.pdf

WimpSim converstion scripts http://copsosx03.physto.se/cgi-bin/edsjo/wimpsim/flxconv.cgi

WimpSim Web http://www.physto.se/~edsjo/wimpsim

11:35 Direct detection module in micrOMEGAs program

Speaker: Alexander Pukhov

Slides pukhov.pdf

12:00 Round table: DM

13:00 → 14:30 Lunch

14:30 → 15:30 Session 3

Convener: Joakim Edsjo (Stockholm Univ.)

14:30 Developing tools for Galactic Cosmic Ray transport: Dark Matter Annihilation in the light of EGRET, HEAT, WMAP, INTEGRAL and ROSAT

The excess of diffuse galactic gamma rays above 1 GeV, as observed by the EGRET telescope on the NASA Compton Gamma Ray Observatory, shows all the key features from Dark Matter (DM) annihilation: 1) the energy spectrum of the excess is the same in all sky directions and is consistent with the gamma rays expected for the annihilation of WIMPs with a mass between 50-100 GeV; 2) the intensity distribution of the excess in the sky is used to determine the halo profile, which was found to correspond to the usual profile from N-body simulations with additional substructure in the form of two doughnut-shaped structures at radii of 4 and 13 kpc; 3) recent N-body similations of the tidal disruption of the Canis Major dwarf galaxy show that it is a perfect progenitor of the ringlike Monoceros tidal stream of stars at 13 kpc with ring parameters in excellent agreement with the EGRET data; 4) the mass of the outer ring is so large, that its gravitational effects influence both the gas flaring and the rotation curve of the Milky Way. Both effects are clearly observed in agreement with the DMA interpretation of the EGRET excess; Although the EGRET excess of gamma rays provides an intriguing hint for DMA, its connection to the search for signals in antimatter particles is hampered by the propagation model uncertainties, which determine the local fluxes of charged species for a given source distribution. There are two main tools in order to determine the local and interstellar fluxes of Cosmic Rays: DarkSUSY, using a simple, but fast analytical approach and GALPROP, which solves the transport equation for Cosmic Rays numerically. In the standard propagation models there is no preferred propagation direction. In such models the Galaxy acts as a large storage box for charged particles, thus leading to a strong enhancement of the particle fluxes from the halo. However, present data from INTEGRAL and ROSAT strongly suggest that convection dominates over diffusion at low energies and in the source region, implying that particles produced by DMA in the halo have little probability to arrive at the detector. We present an anisotropic convection-dominated model for Cosmic Ray transport and show that the EGRET gamma ray excess, the HEAT positron excess, the INTEGRAL positron annihilation signal, the PAMELA antiproton fluxes and the WMAP-haze are consistent with each other in such models.

Speaker: Iris Gebauer (Universitaet Karlsruhe)

Slides gebauer.pdf

14:55 A dark matter tool on the web

Evidences for Dark Matter existence have been increasingly compeling. Current and future direct and indirect searches and results from LHC will provide a wealth of new constraints on the nature of Dark Matter. A web page initiated by the ILIAS network has been set-up to provide the community with a developping tool to evaluate the sensitivities and complementarities of different experiments under different assumptions, theoretical and experimental. The status of this tool will be presented and examples of analysis shown.

Speaker: Dr Rachid LEMRANI (CEA/DAPNIA/SPP)

online tool http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/

Slides lemrani_tools2008.pdf

15:30 → 16:00 Coffee break

16:00 → 18:00 Session 4

Convener: Genevieve Belanger (Annecy, LAPTH)

16:00 POLXINO: Neutralino, chargino, and gluino two-loop pole mass calculator

POLXINO is a C-program for the numerical evaluation of the pole masses of neutralinos, charginos and the gluino in the MSSM with the full set of complex input parameters. The renormalization is performed in the DR-bar' scheme as proposed in the SPA convention. Up to now it contains the full one-loop level and the two-loop SUSY-QCD as well the leading two-loop Yukawa coupling corrections. Currently, it is the only publicly available program for the calculation of even the one-loop chargino and neutralino pole masses with complex parameters. For the calculation of the two-loop self-energy integrals it uses the TSIL library. For convenience, it provides also an SLHA-interface.

Speaker: Helmut Eberl

Slides he_tools08.pdf

16:20 Benchmarking the NMSSM with NMSSMTools

I'll present the latest version of NMSSMTools, a package that computes the NMSSM sparticle and Higgs spectrum and checks all available experimental as well as theoretical constraints.

Speaker: Cyril Hugonie

Slides hugonie.pdf

17:00 Tutorial 4: Marmoset

Speaker: Philip Schuster (SLAC)

Slides schuster.pdf

Friday 4 July

09:00 → 10:30 Session 1

Convener: Pietro Slavich (CERN & Annecy, LAPTH)

09:00 Overview talk: BSM Physics

Speaker: Thorsten Ohl

Slides ohl.pdf

10:05 Automatic calculation of SUSY particle production and decay with GRACE/SUSY-loop

We present results of the investigation on production and decay of neutralino with the automatic calculation system, GRACE/SUSY-loop.

Speaker: Masato Jimbo

Slides Jimbo_TOOLS2008.pdf

10:30 → 11:00 Coffee break

11:00 → 13:05 Session 2

Convener: Fawzi Boudjema (LAPTH CNRS, Annecy)

11:00 FeynHiggs: the swiss army knife for MSSM Higgs physics

Speaker: Sven Heinemeyer (CERN)

Slides heinemeyer.pdf

11:35 Bayesian inference for supersymmetric parameter constraints

I will present an up-to-date analysis of the Constrained MSSM, performed using Bayesian inference techniques to perform a global scan of the relevant parameter space. This allows for the first time to derive constraints accounting for all sources of uncertainties and all relevant data, from accelerator bounds to cosmological and astrophysical observations, including direct and indirect detection methods. I will discuss prospects of direct dark matter detection and forecasts for the most probable regions for the neutralino scattering cross sections, showing that a direct detection is feasible with the next generation of dark matter searches. The complementarity of direct searches to collider experiments will be highlighted, and prospects for indirect detection using gamma rays and positron annihilation signatures will be presented. A new publicly available code (see superbayes.org) for a Bayesian analysis of SUSY models will be presented and illustrated with a demo.

Speaker: Roberto Trotta

Slides Tools08_CMSSM_Trotta.pdf

12:10 SFitter: a tool to determine model parameters from observables

If physics beyond the standard model are discovered, an important goal will be to determine the fundamental parameters of the underlying model from numerous highly correlated observables in a rigorous treatment of the experimental as well as the theoretical errors. SFitter provides a comprehensive bottom-up approach by combining tools to fit models to collider observables and indirect constraints. Several minimization techniques can be used to reconstruct the best parameter set and estimate the errors on its determination. We present the features of SFitter and illustrate its techniques in several supersymmetric scenarios.

Speaker: Emmanuel Turlay (LAL Orsay)

Slides SFITTER_TURLAY.pdf

12:35 Summary

Speaker: Stavros KATSANEVAS (CNRS/IN2P3)

Slides katsanevas.pdf katsanevas.pptx

13:05 → 14:35 Lunch