The particle identification capabilities of the HERA-B RICH are presented on the measured data from the latest run period.

Particle identification with HERA-B RICH

The particle identification performance of the HERA-B RICH is presented The results are based on the measured data acquired in the last running period 2002–2003

Particle identification performance of the HERA-B RICH

ASD8 is the analog front end chosen to read out the photodetectors of the HERA-B RICH. A test of 1791 boards was performed to study which were the best operating conditions, to make a quality assessment and to optimize the distribution of the boards on the RICH focal plane. Nevertheless, some drawbacks are apparent when a board designed for tracker detectors is employed to convert a photomultiplier signal.

Using ASD8 as readout of multianode photomultipliers for single photoelectron discrimination in the HERA-B RICH detector

References

The Ring Imaging Cherenkov detector of the HERA-B experiment at DESY has been completed in January of 1999. Data in its final configuration were taken recently. The HERA-B RICH uses C4F10 as radiator gas and a large 24 m 2 spherical mirror for imaging. The photon detector employs 2240 Hamamatsu multi-anode photomultipliers with a total of 27 000 channels. To match anode dimension (4.5 mm) and dispersion error and to solve the PMT packing problem we used a 2 : 1 reducing two-lens telescope in front of each PMT. The design performance of the RICH was fully reached: the average number of photons for a β=1 particle detected in the RICH was found to be 35.4; a single-photon resolution of 0.65 mrad was reached. We used stand-alone ring finding algorithms to measure the angle and β of tracks. With the position information of the target and that of clusters in the electromagnetic calorimeter we were able to identify electrons, pions, kaons and protons.

The HERA-B ring imaging Cherenkov system – design and performance

The performance of the ring imaging Cherenkov counter (RICH) for the HERA-B experiment has been evaluated. The measured values of the basic parameters such as the number of detected photons per ring and Cherenkov angle resolution are found to agree with a priori estimates. Also at higher track densities, the detector is capable of identifying individual rings. Particle identification has been achieved by determining the momentum from tracks in the vertex detector and main tracking system, hits in the electromagnetic calorimeter and track directions as measured by the RICH.

The performance of the HERA-B RICH at high track densities

The physics potential of the RICH counter of the HERA-B experiment is illustrated in several MC simulated examples. In particular, we discuss its performance as an auxiliary tracking device.

/pdf/the-physics-potential-of-the-hera-b-rich-535vxk9046.pdf

The physics potential of the HERA-B RICH

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The performance of the HERA-B RICH at high track densities

The physics potential of the HERA-B RICH