The LHCb detector will be upgraded to make more efficient use of the available luminosity at the LHC in Run III and extend its potential for discovery. The Ring Imaging Cherenkov detectors are key ...components of the LHCb detector for particle identification. In this paper we describe the setup and the results of tests in a charged particle beam, carried out to assess prototypes of the upgraded opto-electronic chain from the Multi-Anode PMT photosensor to the readout and data acquisition system.
Studies of D + → { η ′ , η , ϕ } e + ν e Yelton, J.; Rubin, P.; Lowrey, N. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
08/2011, Letnik:
84, Številka:
3
Journal Article
We report the first observation of the decay D⁺→η'e⁺νe in two analyses, which combined provide a branching fraction of B(D⁺→η'e⁺νe)=(2.16±0.53±0.07)×10⁻⁴. We also provide an improved measurement of ...B(D⁺→ηe⁺νe)=(11.4±0.9±0.4)×10⁻⁴, provide the first form factor measurement, and set the improved upper limit B(D⁺→Φe⁺νe)<0.9×10⁻⁴ (90%C.L.).
Amplitude analysis of D 0 → K + K − π + π Artuso, M.; Blusk, S.; Mountain, R. ...
Physical review. D, Particles, fields, gravitation, and cosmology,
06/2012, Letnik:
85, Številka:
12
Journal Article
The BABAR Silicon Vertex Tracker has been in operation for four years at the PEP-II electron-positron storage ring. During this time the SVT modules have accumulated a radiation dose up to 2 MRad. We ...study the degradation in the performance of the SVT due to this accumulated dose which is highly non uniform across the detector and also within the single crystals. To extrapolate the performance of the detector to the future we study separately the effect of the irradiation on silicon wafers, front end integrated circuits and on a complete detector module under controlled radiation conditions, using a /sup 60/Co source and a 0.9 GeV e- beam. We compare the results to the data from the SVT. In particular we show the dependence of the charge collection efficiency on the radiation dose even when a small stripe of the module is irradiated up to bulk type inversion. Since the modules that lay in the plane of the beams will suffer significant radiation damage, we will describe our plans for their replacement in 2005 and for the operation of the SVT through the lifetime of the BABAR experiment.
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