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Comment: 13 pages, 3 figures, Invited talk at the session Very High Energy Phenomena in the Universe of the 36th Rencontres de Moriond Les Arcs, France (January 20-27, 2001). Added references
Comment: 5 pages, 3 figures, Latex file. Contribution to the Proceedings of the International Workshop on Linear Colliders, April 28-May 5, 1999, Sitges (Spain), corrected comments
We have studied the effects of ionizing irradiation from a 60Co source and the effects of neutron irradiation on a Monolithic Active Pixel Sensor Chip(MIMOSA8). A previous report was devoted solely to the neutron-induced effects. We show that extended defects due to the neutron damage changes the distribution of the pixels pedestals. This is mainly due to the increase of the dark generation current due to the presence of deep traps in the depleted zones of the sensors. Alternatively, the exposure to ionizing irradiation increases the pedestals in a more homogeneous way, this coming from the generation of interface states at the Si/SiO2 interface supplemented by the presence of positively charged traps in the oxides. the sensors' leakage current is then increased. We discuss the results in view of increasing the radiation-hardness of ...
Theoretical and phenomenological implications of R-parity violation in supersymmetric theories are discussed in the context of particle physics and cosmology. Fundamental aspects include the relation with continuous and discrete symmetries and the various allowed patterns of R-parity breaking. Recent developments on the generation of neutrino masses and mixings within different scenarios of R-parity violation are discussed. The possible contribution of R-parity- violating Yukawa couplings in processes involving virtual supersymmetric particles and the resulting constraints are reviewed. Finally, direct production of supersymmetric particles and their decays in the presence of R-parity-violating couplings is discussed together with a survey of existing constraints from collider experiments.
Fast Monolithic Active Pixel Sensors (MAPS) are now being studied for the high-spatial resolution and high readout speed vertex detector which will be required for the future International Linear Collider (ILC). A 32×128 pixels prototype chip has been developed on the 0.25 μm CMOS TSMC digital process. Combined with in-pixel amplification, in-pixel correlated double sampling (CDS) operation is realized. An auto-zero discriminator is implemented at the end of each column. The power consumption of each column is about 430 μW (pixel+discriminator). The chip is optimized to operate with a readout speed of 20 μs/frame. Beam tests with high energy electrons show that detection efficiency is around 98%
Theoretical and phenomenological implications of R-parity violation in supersymmetric theories are discussed in the context of particle physics and cosmology. Fundamental aspects include the relation with continuous and discrete symmetries and the various allowed patterns of R-parity breaking. Recent developments on the generation of neutrino masses and mixings within different scenarios of R-parity violation are discussed. The possible contribution of R-parity-violating Yukawa couplings in processes involving virtual supersymmetric particles and the resulting constraints are reviewed. Finally, direct production of supersymmetric particles and their decays in the presence of R-parity-violating couplings is discussed together with a survey of existing constraints from collider experiments.
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