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Pion Beam Experiment Page

Analysis of exclusive channels we moved to:

This page contains all informations about preparation to pion experiment: physics simulations, beam optics calculations and detector development.

People involved

IPN, Orsay
  • Beatrice Ramstein
  • Hubert Kuc
  • Thierry Hennino
  • Ermias Atomssa
TU Muenchen
  • Laura Fabbietti
  • Rafal Lalik
  • Eliane Epple
  • Johannes Siebenson
  • Robert Muenzer
  • Joana Wirth
  • Tobias Schmitt
  • Ludwig Maier
GSI Darmstadt
  • Wolfgang Koenig
  • Jerzy Pietraszko
  • Michael Traxler

Pion Beam Physics

Pion Beam Optics

The good starting point is the paper

Design and commissioning of the GSI pion beam.

Simulation of pion beam optics

Pion beam - TDR - Document with the status of the preparation of the pion tracker and evaluation of the beam optics.

  • Git repository (read only access) can be fetch from
    or from the git web interface.
    For RW access to the git repository, please send your ssh key (which will you use for the ssh connection) to Rafal Lalik. If you are not familiar with the git you can download the git repository with the following command:
    git clone git://saturn.e12.ph.tum.de/HADESCerberosTDR.git
    edit your changes and send edited files to Rafal Lalik by e-mail.

Pion Beam Tracker Development

This page contains information about development of Pion Tracker detector for HADES pion experiments.

Cerberos info

Detector and DAQMiscellaneous

Tests results


Counting rates & Physics predictions

Counting rate estimates for different channels and possible beam request presented at the HADES CM in november 2012

Predictions for two pion production from Bonn-Gatchina group (curtesy of a.Sarantsev)

  • download root macro (attached and look into plots)

pipi_hades.cpp: root macro for 2pi
utility_general.cpp: utility_general.cpp

Beam time GSI 1.07-16.07.2014

  • two pion count rates from preliminary analysis on date 186 (46 MLN of events roughly 7 hours of running, 217 files) PionBeamGSI2014
  • Proton-pion and two-pion correlations from 2 MLN events collected for 0.7 GeV /c pions on Carbon and Polyethylene targets

07GeVCarbon.pdf: proton-pion and 2pion correlations from 0.7GeV/c pion induced reactions

Beam time GSI 18.08-11.09.2014

Beam energy scan around second resonance region. * indicate that at this momentum Cristal Ball@ BNL took also data in pi-p -> pi0pi0 n channel- PHYSICAL REVIEW C 69, 045202 (2004) -(complementary channel - very important for PWA analysis because in this channel rho meson MUST be absent). At central value of our measurement 0.69 GeV /c we will have enough statistics to make additional 2 bins in momentum +- 2% (0.703 and 0.677 GeV /c b.t.w also measured by CB)

Runs with PE target

pion momentum [GeV/c] Centrum of mass Energy Number of events
0.8 1.556 >= 40 MLN (measured 52.4 MLN)
0.748* 1.526 >= 40 MLN (measured 76.5 MLN)
0.69 * 1.49 measured 774.7 MLN
0.656* 1.468 >= 40 MLN (measured 42.4 MLN)
0.612* 1.441 >= 40 MLN

For bakcground subtraction we need at least same statistics (40 MLN) in each momenty bin with Carbon target.

Thus, in total we need at least 9 good shifts (4 momentum scan and 5 carbon) to cover this program.

Runs with C target

pion momentum [GeV/c] Centrum of mass Energy Number of events
0.8 1.556 measured 41.2 MLN
0.748* 1.526 measured 42.2 MLN
0.69 * 1.49 measured 115.7 MLN
0.656* 1.468 measured 41.9 MLN
0.612* 1.441 measured 47.8 MLN

Dilepton analysis (Sept 2017):

  • 3-dim acceptance and efficiency matrices calculated from GEANT4 simulations of electrons/positrons with flat momentum distributions (p<700 MeV /c).X=theta (deg) 45 bins (0.,90.) ;Y=phi (deg) 90 bins (0.,360.); Z=p (MeV /c) 40 bins (0.,800.);
  • data and simulation (using PLUTO ρ and old RICH digitizer) events for extraction of Spin Density Matrix coefficients (Andrey's procedure)
  • tar file with Andrey's code. Instructions can be found in the README.
  • files with events generated with the GSI model (old version) in 4π N1440,N1520,N1520+N1440,N1520-N1440: original files and files with appropriate format to be used by the fitting code.
  • Federico's talk in ECT 2017 F_Scozzi_trento.pdf: F_Scozzi_trento.pdf

Dilepton cocktail (Sept 2017):

  • dilepton cocktail based on incoherent sum of contribution of known cross sections: PLUTO simulation. Normalization and C subtraction: pion_dilep_normXS.pdf

Pion beam normalization (Sept 2017):

One pion and two pion production (Sept 2017):

More complete information with start and end run numbers, detailed statistical information can be found here:


-excell table with run info data_august2014.xlsx

On-line analysis of the beam momentum scan

Liquid Hydrogen target

A repair action on the LH2 target is underway. Tests are being conducted with a proton beam at the Orsay Tandem. See the presentation THennino_pactandem_140213.pdf at the PAC meeting on the 14/2/13.

The test at the Orsay tandem was conducted from 6th to 8th of january 2014. See the presentation TEST_LH2_tandem_150114.pdf

segmented Start Detector

The Start detector consists of 9 diamonds each with 4 pads. In runs with the LH2 target, it will be located 40 cm upstream of the target center and about 80 cm inside the support pipe (downstream) of the target. The estimated heat injection after shielding start detector and support rods with aluminized mylar foils (low emissivity of 5% each layer) will amount to several 10 mW. The effect of this heat injection onto liquid stability will be tested as soon as the LN2 target is operational.
Some details of the design can be found in PionBeamStartDetector.pdf. It will be updated regularly.

ISorted ascendingAttachmentActionSizeDateWhoComment
pipi_hades.cppcpppipi_hades.cppmanage 6.3 K 12 Mar 2014 - 14:09PiotrSalabura root macro for 2pi
utility_general.cppcpputility_general.cppmanage 2.5 K 12 Mar 2014 - 14:11PiotrSalabura  
07GeVCarbon.pdfpdf07GeVCarbon.pdfmanage 233.3 K 16 Jul 2014 - 17:15PiotrSalabura proton-pion and 2pion correlations from 0.7GeV/c pion on Carbon
F_Scozzi_trento.pdfpdfF_Scozzi_trento.pdfmanage 3005.7 K 18 Oct 2017 - 09:52PiotrSalabura  
GSI2012.pdfpdfGSI2012.pdfmanage 2574.6 K 26 Feb 2013 - 22:33BeatriceRamstein presentation at the HADES CM in nov. 2012
Lara_Hijazi.Master2-NPAC.pdfpdfLara_Hijazi.Master2-NPAC.pdfmanage 1872.1 K 25 Aug 2014 - 09:46BeatriceRamstein Master2 internship presentation of Lara Hijazi (analysis of May2014 test beam data)
PHN-NQM-HADES-09.pdfpdfPHN-NQM-HADES-09.pdfmanage 115.0 K 26 Nov 2012 - 09:28ElianeEpple GSI Report 2010 about CERBEROS
PHN-NQM-HADES-14.pdfpdfPHN-NQM-HADES-14.pdfmanage 169.8 K 26 Nov 2012 - 09:31ElianeEpple GSI Report 2011 - Status of the Pion Beam Tracker
PHN-NQM-HADES-15.pdfpdfPHN-NQM-HADES-15.pdfmanage 87.3 K 26 Nov 2012 - 09:31ElianeEpple GSI Report 2011 - Simulation for the L1405 in pion reactions
PionBeamCalibration_Apr26.pdfpdfPionBeamCalibration_Apr26.pdfmanage 355.9 K 14 May 2014 - 08:25BeatriceRamstein preliminary analysis of APR2014 measurements
PionBeamStartDetector.pdfpdfPionBeamStartDetector.pdfmanage 189.8 K 03 Apr 2013 - 08:41WolfgangKoenig Pion Beam Start Detector design & simulation
TEST_LH2_tandem_150114.pdfpdfTEST_LH2_tandem_150114.pdfmanage 833.0 K 15 Jan 2014 - 14:11ThierryHennino result of the LH2 test at the Orsay tandem
THennino_pactandem_140213.pdfpdfTHennino_pactandem_140213.pdfmanage 760.2 K 15 Feb 2013 - 09:08ThierryHennino LH2 target test proposal
chamber.pdfpdfchamber.pdfmanage 831.7 K 08 Mar 2013 - 13:42LauraFabbietti Solid Work drawings of the final detector assembly
epjconf_meson2016_witek.pd.pdfpdfepjconf_meson2016_witek.pd.pdfmanage 174.9 K 18 Oct 2017 - 10:00PiotrSalabura Meson2016_proceedings
hades_beam_settings.pdfpdfhades_beam_settings.pdfmanage 60.6 K 30 Apr 2014 - 18:51PiotrSalabura settings of magnets and file names for the measurement of the beam transmission (pdf and excel file)
pion_beam_epem.pdfpdfpion_beam_epem.pdfmanage 297.7 K 27 Aug 2014 - 17:34WitoldPrzygoda Pion beam e+e- (ver 27.08.14 evening)
pion_dilep_normXS.pdfpdfpion_dilep_normXS.pdfmanage 985.7 K 18 Oct 2017 - 10:35PiotrSalabura cocktail
pions_from_august.pdfpdfpions_from_august.pdfmanage 299.2 K 30 Aug 2014 - 07:15PiotrSalabura one,two pion events from day 232/233-pdf file
piontracker-30-08-2014.pdfpdfpiontracker-30-08-2014.pdfmanage 1493.5 K 01 Sep 2014 - 16:11JoanaWirthPionTracker:Hitfinder
salabura_ect_PION.pdfpdfsalabura_ect_PION.pdfmanage 1033.8 K 18 Oct 2017 - 10:03PiotrSalabura presentation ECT
witek_cm_2016_paris.pdfpdfwitek_cm_2016_paris.pdfmanage 582.7 K 18 Oct 2017 - 09:56PiotrSalabura Witek prezentation in CM2016 Paris
pt_0.pngpngpt_0.pngmanage 19.0 K 06 Jul 2014 - 17:54KirillLapidus it is very preliminary
pion_intro_hades.pptpptpion_intro_hades.pptmanage 5956.0 K 02 Sep 2014 - 07:50PiotrSalabura introduction to HADES pion physics programme
pion_exp_target_consid.pptxpptxpion_exp_target_consid.pptxmanage 1051.1 K 02 Sep 2014 - 07:56PiotrSalabura consideration on targets for pion experiment and update on count estimates
pions_from_august.pptxpptxpions_from_august.pptxmanage 248.8 K 30 Aug 2014 - 07:17PiotrSalabura one,two pion events from day 232/233
Efficiency.rootrootEfficiency.rootmanage 787.2 K 19 Sep 2017 - 15:28BeatriceRamstein efficiency matrices for electrons and positrons
acceptance_electrons.rootrootacceptance_electrons.rootmanage 313.3 K 19 Sep 2017 - 15:29BeatriceRamstein acceptance matrix for electrons
acceptance_positrons.rootrootacceptance_positrons.rootmanage 329.2 K 19 Sep 2017 - 15:29BeatriceRamstein acceptance matrix for positrons
data_august2014.xlsxxlsxdata_august2014.xlsxmanage 11.0 K 11 Sep 2014 - 08:47ThierryHennino data summary september 2014
hades_beam_settings.xlsxxlsxhades_beam_settings.xlsxmanage 10.7 K 30 Apr 2014 - 18:53PiotrSalabura  
summary_data_300414.xlsxxlsxsummary_data_300414.xlsxmanage 11.7 K 01 May 2014 - 11:35ThierryHennino summary of settings for transport coefficients measurements
GSImodel_oldfiles_saranformat.zipzipGSImodel_oldfiles_saranformat.zipmanage 14435.9 K 29 Sep 2017 - 15:40BeatriceRamstein  

Revision r96 - 19 Apr 2018 - 13:20 - PiotrSalabura
Revision r95 - 27 Nov 2017 - 14:06 - PiotrSalabura
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