Low p_T development

QM'06 Posters

• CMS posters
• CMS HI posters
  F. Siklér: Low p_T Hadronic Physics with CMS

CMSSW Software

Minimizers

• http://seal.web.cern.ch/seal/MathLibs/5_0_8/Minuit2/html/classROOT_1_1Minuit2_1_1VariableMetricMinimizer.html
• http://seal.web.cern.ch/seal/MathLibs/5_0_8/Minuit2/html/classROOT_1_1Minuit2_1_1FunctionMinimum.html

Low p_T tracking

• RecoTracker/TkTrackingRegions
  GlobalTrackingRegion.h is modified to lower ptMin
  

  GlobalTrackingRegion ( float ptMin = 0.075, float originRadius = 0.2,

• RecoPixelVertexing/PixelTriplets
• RecoPixelVertexing/PixelLowPtUtilities
• RecoPixelVertexing/PixelTrackFitting
  PixelFitterByHelixProjections.{cc,h} is modified for correct calculation of cotθ
  

float PixelFitterByHelixProjections::cotTheta
  (const vector<GlobalPoint> & points,
   float radius, float phi, float d0, float& zip) const
...
   float chi = phi - M_PI_2;
   GlobalPoint IP(d0*cos(chi), d0*sin(chi),zip);

   float phi1 = 2*asin(0.5*(gp1 - IP).perp()/radius);
   float phi2 = 2*asin(0.5*(gp2 - IP).perp()/radius);

   float dr = radius*(phi2 - phi1);
   float dz = gp2.z()-gp1.z();

   // Recalculate ZIP
   zip = (gp1.z()*phi2 - gp2.z()*phi1)/(phi2 - phi1);

V0

• DataFormats/VZero
• RecoVZero/VZeroFinding

dE/dx

• RecoPixelVertexing/PixelLowPtUtilities

Association

• SimTracker/TrackerHitAssociation
  get from cvs
• SimTracker/TrackAssociation
  get from cvs

Vertices

LowPtVertices

Event galleries

EventGallery EventGalleryDijet BatchUploadPlugin dev

Links

• CMSSW source browser (1_2_0_pre1)
• Instructions
• LiveGraphics3D Tutorial
• Big pixels

Unfolding

• András László: A robust iterative unfolding method for signal processing math-ph/0601017 J Phys A
• András László: Deconvolution method, its application for photons, pi0s

Installation

Standalone install on debian

SLC3 machine:

% setenv VO_CMS_SW_DIR <directory>
% setenv SCRAM_ARCH slc3_ia32_gcc323
% mkdir $VO_CMS_SW_DIR
% wget -O $VO_CMS_SW_DIR/aptinstaller.sh \
  http://cmsdoc.cern.ch/cms/cpt/Software/download/cms/aptinstaller.sh
% chmod +x $VO_CMS_SW_DIR/aptinstaller.sh
% $VO_CMS_SW_DIR/aptinstaller.sh setup -unsupported_distribution_hack \
  -repository cms -path $VO_CMS_SW_DIR
% eval `$VO_CMS_SW_DIR/aptinstaller.sh config -path $VO_CMS_SW_DIR -csh`
% apt-get update
% apt-cache search cmssw
% apt-get install cms+cmssw+CMSSW_1_2_0_pre1

Debian machine:

% setenv SCRAM_ARCH slc3_ia32_gcc323
% setenv VO_CMS_SW_DIR <directory>
% source $VO_CMS_SW_DIR/cmsset_default.csh
% scramv1 project CMSSW CMSSW_1_2_0_pre1

• Install libboost-dev.

Pixel clusters

Pixel digitizer

CMSSW/SimTracker/SiPixelDigitizer/data/PixelDigi.cfi

int32 AddPixelInefficiency = 0 // static loss only, v.low lumi
bool AddNoisyPixels = true
bool !MissCalibrate = true

Pixel clusterizer

CMSSW/RecoLocalTracker/SiPixelClusterizer/src/PixelThresholdClusterizer.cc
in make_cluster change

268     for ( int r = curpix.row()-2; r <= curpix.row()+2; r++) {
269       for ( int c = curpix.col()-2; c <= curpix.col()+2; c++) {

Cluster shape

Hit triplets

-- FerencSikler - 16 Oct 2006