Introduction to the demo Dark Matter Tool on the Web - PowerPoint PPT Presentation

TOOLS 2008 New physics and its background June 30 - July 4, 2008 MPI Munich, Germany Introduction to the demo “Dark Matter Tool on the Web” http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS-N3 Dark Matter Network / CEA Saclay

A word on ILIAS Integrated Large Infrastructures for Astroparticle Science European tool : I3 structure (Integrated Infrastructure Initiative) of FP6 Participants: 21 Contractors (70 laboratories), 14 European Countries Start date ; April 1st 2004 for 5 years Web site : ilias.in2p3.fr Prime areas : Double Beta Decay, Dark Matter, Gravitational Waves Infrastructures : - Deep Underground Laboratories - Gravitational Wave Interferometers “ … to produce a focused, coherent and integrated project to improve the existing infrastructures and their operation as well as to organise and structure the scientific community to prepare the best infrastructures for the future.” http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

A word on ILIAS-N3 Dark Matter Network Web site : http://ilias-darkmatter.uni-tuebingen.de/ Working groups → Input for ASPERA Roadmap http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Web tool : Purpose - Build a web interface for dark matter calculations : Expected spectra, limits extraction, … - Handling different detection techniques - Handling different theoretical assumptions - Cross check methods and codes - Available to the whole dark matter community - Allowing comparisons of experimental strategies using the same theoretical inputs and varying them Nothing to install. The calculations are done online with a web browser. http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Homepage http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

List of available pages I will focuse on these 2 webpages - expected experimental signal for given WIMP - Deriving limits on WIMP-nucleon cross section from experiments http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Direct Search for WIMPs WIMP nature : ie Neutralino Galactic Halo = density = WIMP-nucleus cross section (point-like) ρ = σ = f(v) = = velocity distribution m χ = WIMP mass = = WIMP-nucleus reduced mass) ( ( µ µ = Nucleus Detection rate : F = Nuclear form factor V esc µ = WIMP-nucleus reduced mass µ ∫ dN f(v) = σ ρ F 2 dv 2µ 2 m χ dE v 2µ V min (E r ) Detection X ε (E) / q (E) ⊗ r (E) q (E) = quenching ε (E) = efficiency r (E) = resolution J. D. Lewin and P. F. Smith, Astropart. Phys. 6 , (1996)87 http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Experimental Spectra 1 2 3 4 5 Add, Combine, reset 1 Label of the produced figure WIMP mass (GeV) 2 A of Target : defines nucleus form factor, WIMP-nucleon reduced mass 3 Exposure (kg.days) : mass of detector x acquisition time 4 WIMP-nucleon cross-section (pb) 5 Default values are “standard” for galactic halo, nuclear form factors and recoil spectra are without experimental parameters http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Ex. : Dependence on WIMP Mass All parameters are entered in a form : The outputs are figures and tables Using ddmc tool (by J. Gascon, V. Sanglard and R.L.) http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

How it works Input PHP form Session variables parameters with a bit of Javascript for ergonomy calls Temporary directory Shell script creates contains calls Root Results : Physics program figures, tables creates When leaving the webpage or starting new figures the session is destroyed → before leaving copy the created figures and tables http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Galactic Halo 0 = WIMP density (GeV/cm 3 ) ρ 0 V esc V 0 defines velocity distribution f(v) maxwellian ∫ f(v) dv Galactic escape velocity V esc = upper bound on integral v V min (E r ) http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Nuclear Form Factors Two form factors function of A of target http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Experimental Parameters Experimental parameters default values : Quenching = 1 Resolution = 0 Efficiency = 1 http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Efficiency Explained in next slide http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Entering binned values N bins Bins edges Efficiencies (N bins +1 numbers) (N bins numbers) eff 1 Example : 1 0 200 1 0 200 E eff 1 Example : 2 0 100 200 0.5 1 0.5 0 E 100 200 http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Quenching Type : a) Lindhard parametrisation aE r b b) binned Type a) parameters a and b Type b) binned http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Resolution Type : a) parametrisation a+b √ E r b) binned Type a) parameters a and b Type b) binned http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Effect of resolution/quenching Effect of resolution Low resolution => flattens the spectra quenching=0.36->0.3 An error on quenching estimation but worsens efficiency changes the recoil energy threshold (discrimination) http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

LIMITS on WIMP-nucleon cross-section http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

LIMITS on WIMP-nucleon cross-section 1 2 3 4 5 Method : 1. Poisson enter also number of Observed events 2 2. Feldman-Cousins/Cousins-Highland 2 enter also number of Observed events and Expected background events 3 4 and uncertainty on background (Feldman-Cousins for poisson process with a perfectly known background Cousins-Highland if uncertainty on background) 3. Enter directly predetermined limit on rate 2 2 4. Yellin method : enter number of observed events and their energy 5 (uses optimal interval method) http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany

Demo The webpage address is : http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ Some examples can be found in : http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/examples.html All contributions, suggestions, cross-checks, feedback to enrich, improve the tool are very welcome http://pisrv0.pit.physik.uni-tuebingen.de/darkmatter/ R. Lemrani, ILIAS N3 / CEA Saclay TOOLS for the new physics and its background , June 30- July 4 2008, MPI, Munich, Germany