Hadident task home page

This page collects the information on the hadron identification task i.e. pion, kaon and proton identification with the ionization loss measured in the TPC or the vertex detector and the Cherenkov photons detected in the RICHes. If you want to contribute, in case of problems or questions contact P. Kluit

dE/dx

RICH and dE/dx

• NEW! 183 GeV data: a plot for the dE/dx and RICHes used in the search for heavy long-lived sleptons. The analysis is extended to heavy long-lived squarks.
• A plot for the dE/dx and RICHes used in the search for heavy particles at 172 GeV can be found here.
• A note - updated for the 94C processing - COMBINE is available on the RICH, TPC and combined RICH/TPC tags, with examples and a description of the tagging commons, efficiencies and comparison of data and simulation for the 94C2 processing.
• The status of the new processing 94C can be found in status94c. A plot for the 94C combined dE/dx and RICH heavy particle tag is available. The upper part shows the number of tagged events vs the momentum in data and simulation. The green area corresponds to the pions in the sample. The lower plot gives the efficiency vs the momentum: blue points for the protons, red for the kaons and green for the pions. A plot for the mean Cherenkov angle in the BRICH gas radiator (94C) for high momentum tracks above 7 GeV/c before and after a heavy TPC tag, shows clearly the proton and kaon bands.

RICH

• NEW! RICH plots for the 1997 data can be found for the 183 GeV hadronic data , and a plot of the mass squared distibution for fast kaons in the BRICH and FRICH.
• Two DELPHI notes give a description of the reconstruction algorithm RIBMEAN DELPHI 96-133 RICH 90 - updated for the 94C data - and of the tagging routine NEWTAG DELPHI 96-103 RICH 89. Both notes give extensive information, examples and comparison of data and simulation (measured misidentification rates, efficiencies etc.) for the 94B3 processing.
• Plots for the 94C2 data and simulation for RIBMEAN: the Cherenkov angle and number of photons for both RICHes. The scanned transparencies of the talk on the performance and improvements of the RICHes in 94C can be found on the DELPHI FORUM page.
• A small note has been written for user who want to use RIBMEAN tagging routines for high efficiency kaon or proton tagging. It is explained how similar efficiencies and purities as HADSIGN can be reached.
• Some RICH results for the 1996 data can be found for the hadronic Z data period 2, and a plot of the mass squared distibution for Z and 172 GeV data showing kaons.
• To get started, read the user guide of the hadident/rich software: doc.html or doc.ps (14-Jun-1996). Examples and instructions can also be found in the dstana writeup and in the DELPHI notes on RIBMEAN and NEWTAG and the note COMBINE.
• Some news items are in the status1.ps and status2.ps files.
• You can find some RICH colour plots 94C for fast kaons and for the liquid radiator. More hadron identification plots can be found in figures.
• Plots and notes were made in summer 1995, using the 94B2 processing. They are obsolete both for RIBMEAN and HADSIGN, but you can still find them for vzero's and identified muons .
• Users can find information about ringscan , based on 94B2.
• The new rich fullDST format .
• Other information on the RICH, as e.g. physics publications, can be found on the DELPHI rich page.