LHCb RICH Performance in DC04

Introduction

This page presents the LHCb RICH detector performance data for the DC04 Monte Carlo productions. The results shown below were produced using a privately generated sample of 20K B inclusive (event type 10000000) events.

The software versions used where :-

Only a selection of performance figurs 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.

Cherenkov Theta Angle Resolution

The following images show the Cherenkov theta resolutions obtained in the DC04 data production, for forward tracks only (for other track types, see the attached image tar file). 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).

Aerogel CK theta resolution for forward tracks C4F10 CK theta resolution for forward tracks CF4 CK theta resolution for forward 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.

Number of unscattered detected aerogel photons per track for DC04 Number of detected <a class=C4F10 photons per track for DC04" width="567" height="384" /> Number of detected CF4 photons per track for DC04

PID Performance versus Track Momentum

Overall Forward Track Performance

The following figures show the RICH particle identification performance, as a function of momentum. 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 and RichLightID identifications for the 2 to 100 GeV momentum range, and only for forward tracks.

Rich Heavy PID performance versus momentum for DC04 Rich Light PID performance versus momentum for forward tracks in DC04

The following images are for explicitly identifying kaons as kaons and pions as pions.

Rich kaon PID performance versus momentum for forward tracks in DC04

Rich pion PID performance versus momentum for forward tracks in DC04

Positive and Negative Track Comparisions

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.

Comparision of the Heavy ID performance for positive and negative tracks in DC04 Comparision of kaon ID performance for positive and negative tracks in DC04

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.

RICH Heavy ID performance for the aerogel radiator only, for forward tracks in DC04 RICH Heavy ID performance for the <a class=C4F10 radiator only, for forward tracks in DC04" width="567" height="384" /> RICH Heavy ID performance for RICH1 only, forward tracks in DC04 RICH Heavy ID performance for RICH2 only, forward tracks in DC04

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.

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


ChrisRJones - 27 Jul 2005
Topic attachments
I Attachment HistorySorted ascending Action Size Date Who Comment
PNGpng aeroCKRes_forwardTracks_rec-exp.png r1 manage 7.7 K 2005-07-27 - 19:17 ChristopherRJones Aerogel Cherenkov theta resolution for forward tracks in DC04
PNGpng aero_nCKphotons.png r1 manage 7.8 K 2005-07-27 - 18:04 ChristopherRJones Number of unscattered detected aerogel photons per track for DC04
PNGpng c4f10CKRes_forwardTracks_rec-exp.png r1 manage 8.0 K 2005-07-27 - 19:18 ChristopherRJones C4F10 Cherenkov theta resolution for forward tracks in DC04
PNGpng c4f10_nCKphotons.png r1 manage 8.2 K 2005-07-27 - 18:05 ChristopherRJones Number of detected C4F10 photons per track for DC04
PNGpng cf4CKRes_forwardTracks_rec-exp.png r1 manage 7.9 K 2005-07-27 - 19:19 ChristopherRJones CF4 Cherenkov theta resolution for forward tracks in DC04
PNGpng cf4_nCKphotons.png r1 manage 8.3 K 2005-07-27 - 18:06 ChristopherRJones Number of detected CF4 photons per track for DC04
PNGpng dc04_aero_heavyID-frwd_2to100GeV.png r1 manage 20.0 K 2005-08-03 - 12:37 ChristopherRJones RICH Heavy ID performance for the aerogel radiator only, for forward tracks in DC04
PNGpng dc04_c4f10_heavyID-frwd_2to100GeV.png r1 manage 19.0 K 2005-08-03 - 12:38 ChristopherRJones RICH Heavy ID performance for the C4F10 radiator only, for forward tracks in DC04
PNGpng dc04_heavyID-frwd_radCompare.png r1 manage 39.6 K 2005-08-03 - 12:42 ChristopherRJones The Rich Heavy ID performance in each radiator, compared to that obtained overall
PNGpng dc04_rich1_heavyID-frwd_2to100GeV.png r1 manage 19.0 K 2005-08-03 - 12:31 ChristopherRJones RICH Heavy ID performance for RICH1 only, forward tracks in DC04
PNGpng dc04_rich2_heavyID-frwd_2to100GeV.png r1 manage 16.9 K 2005-08-03 - 12:32 ChristopherRJones RICH Heavy ID performance for RICH2 only, forward tracks in DC04
PNGpng heavyID-all_2to100GeV_posneg.png r1 manage 27.2 K 2005-07-29 - 21:44 ChristopherRJones Comparision of Heavy ID performance for positive and negative tracks in DC04
PNGpng kaonID-all_2to100GeV_posneg.png r1 manage 26.5 K 2005-07-29 - 21:54 ChristopherRJones Comparision of kaon ID performance for positive and negative tracks in DC04
PNGpng kaonID-frwd_2to100GeV.png r1 manage 16.9 K 2005-07-27 - 19:25 ChristopherRJones Rich kaon PID performance versus momentum for forward tracks in DC04
PNGpng pionID-frwd_2to100GeV.png r1 manage 17.4 K 2005-07-27 - 19:25 ChristopherRJones Rich pion PID performance versus momentum for forward tracks in DC04
PNGpng lightID-frwd_2to100GeV.png r2 r1 manage 16.8 K 2005-07-27 - 19:22 ChristopherRJones Rich Light PID performance versus momentum for forward tracks in DC04
PNGpng heavyID-frwd_2to100GeV.png r4 r3 r2 r1 manage 17.2 K 2005-08-03 - 11:23 ChristopherRJones Rich Heavy PID performance versus momentum for forward tracks in DC04
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Topic revision: r13 - 2005-08-06 - ChristopherRJones
 
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