SELEX RICH performance and physics results

SELEX RICH Performance and Physics Results ∗

SELEX took data in the 1996/7 Fixed Target Run at Fermilab. The excellent performance parameters of the SELEX RICH Detector had direct influence on the quality of the obtained physics results.

Recent Results on Charm and Hyperon Physics from Selex

Physics Results from RICH Detectors

RICH detectors have become extraordinarily useful. Results include measurement of solar neutrino rates, evidence for neutrino oscillations, measurement of TeV γ-rays from gravitational sources, properties of QCD, charm production and decay, and measurement of the CKM matrix elements Vcs, Vcb and Vub. A new value |Vub/Vcb| = 0.087 ± 0.012 is determined. . . . . . . . . . . . . . . . . . . . . . ...

The SELEX Phototube RICH Detector

In this article, construction, operation, and performance of the RICH detector of Fermilab experiment 781 (SELEX) are described. The detector utilizes a matrix of 2848 phototubes for the photocathode to detect Cherenkov photons generated in a 10m Neon radiator. For the central region an N0 of 104 cm , corresponding to 13.6 hits on a β = 1 ring, was obtained. The ring radius resolution measured ...

Recent results from Selex

The SELEX experiment (E781) is a 3-stage magnetic spectrometer for a high statistics study of hadroproduction of charm baryons out to large xF using 650 GeV Σ,π and p beams. The main features of the spectrometer are: a high precision silicon vertex system; powerful particle identification provided by TRD and RICH; forward Λs decay spectrometer; and 3-stage lead glass photon detector. Preliminar...