LHCb RICH Performance in Brunel Development Version v27r3

Introduction

This page presents the LHCb RICH detector performance data for the development version of Brunel v27r3. This version is similar to the RTTC05 compatibile production, but is the first version to incorporate a new tuning of the RICH offline reconstruction (see here for details).

The results shown below were produced using a privately generated sample of 20K B inclusive (event type 10000000) events.

The software versions used where :-

Raw ROOT files and Figures for download

Only a selection of performance figures are shown on this page. All figures are though available for download, in both png and eps formats. In addition the raw ROOT histogram files are also available. See here for available data files. The ROOT macros used to produce the images are also available.

Core Track Resolutions

These section contains some figures showing the resolutions obtained from the various Track types at the entrance and exit points to each of the RICH radiator media. These resolutions feed directly in the Cherenkov theta resolutions shown in the proceeding sections.

Cherenkov Theta Angle Resolution

Forward Tracks CK Theta Resolution

The following images show the Cherenkov theta resolutions obtained in the RTTC05 data production, for forward tracks only (for other track types, see the attached image tar files). The resolution is defined as the difference between the reconstruction cherenkov theta angle for a given track and pixel pair, and the expected Cherenkov angle for the given track in the radiator medium (based on the reconstructed track parameters).

Note, if you require eps format images, these can be found in the image tar files available here.

Aerogel Cherenkov theta resolution for forward tracks C4F10 Cherenkov theta resolution for forward tracks CF4 Cherenkov theta resolution for forward tracks

VeloTT Tracks CK Theta Resolution

For comparison, the same plots for VTT tracks (in aerogel and C4F10 only).

Aerogel Cherenkov theta resolution for <nox>VeloTT tracks C4F10 Cherenkov theta resolution for <nox>VeloTT tracks

Cherenkov Photon Yields

The following figures show the distributions for the number of detected unscattered Cherenkov photons in each of the radiator media. Only saturated tracks (beta>0.99) were used.

Note, if you require eps format images, these can be found in the image tar files available here.

Number of unscattered detected aerogel photons per track Number of detected <a class=C4F10 photons per track" width="567" height="384" /> Number of detected CF4 photons per track

PID Performance versus Track Momentum

Overall Track Performance

The following figures show the RICH particle identification performance, as a function of momentum, for forward tracks and match tracks. No cuts on the delta Log-Likelihood values are applied; tracks are ID using the "best" measure, i.e. the mass hypothesis that gave the minimum overall likelihood. The figures of merit used are the RichHeavyID, RichLightID, RichKaonID and RichPionID identifications for the 2 to 100 GeV momentum range.

For images for other track types, see the attached image tar files.

Forward Tracks PID Performance

Heavy and Light ID :-

Rich Heavy ID performance for forward tracks RICH Light ID performance for forward tracks

The following images are for explicitly identifying kaons as kaons and pions as pions :-

Rich kaon PID performance for forward tracks Rich pion PID performance for forward tracks

Match Tracks PID Performance

Heavy and Light ID :-

brv27r3_heavyID-match_2to100GeV.png brv27r3_lightID-match_2to100GeV.png

The following images are for explicitly identifying kaons as kaons and pions as pions :-

brv27r3_kaonID-match_2to100GeV.png brv27r3_pionID-match_2to100GeV.png

Positive and Negative Track Comparisons

The following images gives a comparison of the RichHeavyID and kaon performance for positive and negative tracks. The figures was produced for all track types combined. Currently the comparision is statistics limited; No difference can be seen between the positive and negative tracks. However, a small difference is expected and thus larger statistics studies will follow.

Note, if you require eps format images, these can be found in the image tar files available here.

Comparision of Heavy ID performance for positive and negative tracks (all track types combined) Comparision of kaon ID performance for positive and negative tracks (all track types combined)

Individual Performance in each RICH Detector and Radiator Media

The following figures given the RichHeavyID performance as a function of track momentum when only one of the two RICH detectors are used and for RICH1 when only aerogel or the C4F10 radiators are considered. The information from the other radiators are simply ignored. As with the previous performance curves, only forward tracks are included.

Note, if you require eps format images, these can be found in the image tar files available here.

RICH Heavy ID performance for the aerogel radiator only, for forward tracks RICH Heavy ID performance for the <a class=C4F10 radiator only, for forward tracks" width="567" height="384" /> RICH Heavy ID performance for RICH1 only, forward tracks RICH Heavy ID performance for RICH2 only, forward tracks

Breakdown of Performance by Radiator Medium

The following figure compares the individual performance in each radiator medium with that obtained overall when the information from all radiators are combined.

The red points are the K->K,Pr efficiency whilst the blue points represent the pi->K,Pr mis-identification rate. The solid points give the overall performance when all radiators are combined, whilst the open crosses, squares and triangles give the individual performance in the aerogel, C4F10 and CF4 radiators respectively.

Note, if you require eps format images, these can be found in the image tar files available here.

The Rich Heavy ID performance in each radiator, compared to that obtained overall

Reference Log Files

The following are reference logs files from the RICH reconstruction.


ChrisRJones - 12 Nov 2005
Topic attachments
I Attachment History Action Size Date Who Comment
Unknown file formatlog allrads-newTune-10000000.log r1 manage 519.7 K 2005-08-16 - 18:01 ChristopherRJones Log file for RICH reconstruction. All radiators Brunel v27r3.
PNGpng brv27r3_aeroCKRes_forwardTracks_rec-exp.png r1 manage 8.3 K 2005-08-05 - 13:12 ChristopherRJones Aerogel Cherenkov theta resolution for forward tracks
PNGpng brv27r3_aeroCKRes_veloTTTracks_rec-exp.png r1 manage 8.3 K 2006-08-15 - 10:58 UnknownUser Aerogel Cherenkov theta resolution for VeloTT tracks
PNGpng brv27r3_aero_heavyID-frwd_2to100GeV.png r1 manage 19.1 K 2005-08-03 - 18:05 ChristopherRJones RICH Heavy ID performance for the aerogel radiator only, for forward tracks
PNGpng brv27r3_aero_nCKphotons.png r1 manage 7.8 K 2005-08-05 - 13:14 ChristopherRJones Number of unscattered detected aerogel photons per track
PNGpng brv27r3_c4f10CKRes_forwardTracks_rec-exp.png r1 manage 8.2 K 2005-08-05 - 13:12 ChristopherRJones C4F10 Cherenkov theta resolution for forward tracks
PNGpng brv27r3_c4f10CKRes_veloTTTracks_rec-exp.png r1 manage 8.4 K 2006-08-15 - 10:59 UnknownUser C4F10 Cherenkov theta resolution for VeloTT tracks
PNGpng brv27r3_c4f10_heavyID-frwd_2to100GeV.png r1 manage 19.0 K 2005-08-03 - 18:06 ChristopherRJones RICH Heavy ID performance for the C4F10 radiator only, for forward tracks
PNGpng brv27r3_c4f10_nCKphotons.png r1 manage 9.0 K 2005-08-05 - 13:15 ChristopherRJones Number of detected C4F10 photons per track
PNGpng brv27r3_cf4CKRes_forwardTracks_rec-exp.png r1 manage 8.2 K 2005-08-05 - 13:12 ChristopherRJones CF4 Cherenkov theta resolution for forward tracks
PNGpng brv27r3_cf4_nCKphotons.png r1 manage 8.3 K 2005-08-05 - 13:15 ChristopherRJones Number of detected CF4 photons per track
PNGpng brv27r3_heavyID-all_2to100GeV_posneg.png r1 manage 26.8 K 2005-08-03 - 17:53 ChristopherRJones Comparision of Heavy ID performance for positive and negative tracks (all track types combined)
PNGpng brv27r3_heavyID-frwd_2to100GeV.png r1 manage 17.3 K 2005-08-03 - 17:47 ChristopherRJones Rich Heavy ID performance for forward tracks
PNGpng brv27r3_heavyID-frwd_radCompare.png r1 manage 38.6 K 2005-08-03 - 18:09 ChristopherRJones The Rich Heavy ID performance in each radiator, compared to that obtained overall
PNGpng brv27r3_heavyID-match_2to100GeV.png r3 r2 r1 manage 19.0 K 2006-08-17 - 13:16 UnknownUser Rich Heavy ID performance for match tracks
PNGpng brv27r3_kaonID-all_2to100GeV_posneg.png r1 manage 26.5 K 2005-08-03 - 17:54 ChristopherRJones Comparision of kaon ID performance for positive and negative tracks (all track types combined)
PNGpng brv27r3_kaonID-frwd_2to100GeV.png r1 manage 17.1 K 2005-08-03 - 17:50 ChristopherRJones Rich kaon PID performance for forward tracks
PNGpng brv27r3_kaonID-match_2to100GeV.png r1 manage 18.6 K 2006-08-17 - 12:46 UnknownUser Rich kaon ID performance for match tracks
PNGpng brv27r3_lightID-frwd_2to100GeV.png r1 manage 17.1 K 2005-08-03 - 17:48 ChristopherRJones RICH Light ID performance for forward tracks
PNGpng brv27r3_lightID-match_2to100GeV.png r1 manage 18.7 K 2006-08-17 - 12:46 UnknownUser Rich Light ID performance for match tracks
PNGpng brv27r3_pionID-frwd_2to100GeV.png r1 manage 17.3 K 2005-08-03 - 17:51 ChristopherRJones Rich pion PID performance for forward tracks
PNGpng brv27r3_pionID-match_2to100GeV.png r1 manage 17.9 K 2006-08-17 - 12:46 UnknownUser Rich Pion ID performance for match tracks
PNGpng brv27r3_rich1_heavyID-frwd_2to100GeV.png r1 manage 18.8 K 2005-08-03 - 18:07 ChristopherRJones RICH Heavy ID performance for RICH1 only, forward tracks
PNGpng brv27r3_rich2_heavyID-frwd_2to100GeV.png r1 manage 16.6 K 2005-08-03 - 18:08 ChristopherRJones RICH Heavy ID performance for RICH2 only, forward tracks
Unknown file formatlog rich1-newTune-10000000.log r1 manage 512.4 K 2005-08-16 - 18:02 ChristopherRJones Log file for RICH reconstruction. RICH1 only Brunel v27r3.
Unknown file formatlog rich2-newTune-10000000.log r1 manage 515.3 K 2005-08-16 - 18:02 ChristopherRJones Log file for RICH reconstruction. RICH2 only Brunel v27r3.
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