A. Ramusino

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Radiation hardness of the CLARO-CMOS, a prototype ASIC for low power and fast single-photon counting in 0.35 micron CMOS technology

by R. Malaguti, A. Ramusino, and M. Andreotti

First-year experience with the BaBar silicon vertex tracker

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

Within its first year of operation, the BaBar Silicon Vertex Tracker (SVT) has accomplished its p... more Within its first year of operation, the BaBar Silicon Vertex Tracker (SVT) has accomplished its primary design goal, measuring the z vertex coordinate with sufficient accuracy as to allow the measurement of the time-dependent CP asymmetry in the neutral B-meson system. The SVT consists of five layers of double-sided, AC-coupled silicon-strip detectors of 300 μm thickness with a readout strip pitch of 50–210 μm and a stereo angle of 90° between the strips on the two sides. Detector alignment and performance with respect to spatial ...

$Research paper thumbnail of First Observation and Measurement of the Decay K$^{+-}$ $\to\pi^{+-}e^{+}e^{-}\gamma$$

First Observation and Measurement of the Decay K$^{+-}$ $\to\pi^{+-}e^{+}e^{-}\gamma$

by Ferruccio Petrucci and A. Ramusino

Using the full data set of the NA48/2 experiment, the decay K+- -> pi+- e+ e- gamma is observe... more Using the full data set of the NA48/2 experiment, the decay K+- -> pi+- e+ e- gamma is observed for the first time, selecting 120 candidates with 7.3 +- 1.7 estimated background events. With K+- -> pi+- pi0D as normalisation channel, the branching ratio is determined in a model-independent way to be Br(K+- -> pi+- e+ e- gamma, m_eegamma >

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READOUT ELECTRONICS OF THE NA62 GIGATRACKER SYSTEM

by A. Ramusino and A. Ceccucci

Astroparticle, Particle and Space Physics, Detectors and Medical Physics Applications - Proceedings of the 11th Conference, 2010

A crucial detector of the NA62 experiment is the beam spectrometer named Gigatracker. It consists... more A crucial detector of the NA62 experiment is the beam spectrometer named Gigatracker. It consists of three stations of hybrid silicon pixels sensors with 150 ps (rms) of time resolution and 100 µm (rms) of space resolution. In addition the system operates under a high radiation environment and a high density of particles (up to 1.5 MHz/mm 2 in the centre and 0.8 -1 GHz in total). To meet these requirements the readout electronics must compensate the discriminators time-walk and the dead time should be below 1%. In order to evaluate the best solution, two readout chips have been developed. One is based on the constant-fraction discriminator technique and the other one is based on the use of a time-over-threshold circuit. The global architectures of both the front-end ASIC will be discussed.

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An ultra fast silicon pixel detector for the NA62 experiment: the Gigatracker

The beam spectrometer of the NA62 experiment has to sustain high and non-uniform beam rate (∼1.5 ... more The beam spectrometer of the NA62 experiment has to sustain high and non-uniform beam rate (∼1.5 MHz/mm2 in the hot center and 0.8-1.0 GHz in total, hence the name Gigatracker) and should preserve beam divergence and limit beam hadronic interactions. The Gigatracker has to provide precise momentum, time and angular measurements on every single track of the sec- ondary 75 GeV/c hadron beam with a timing precision of 150 ps (rms). To meet these require- ments, three hybrid silicon pixel detector stations will be installed in vacuum. An adequate strat- egy to compensate the discriminator time-walk must be implemented and R&D investigating two different options is ongoing. Two prototypes have been designed in order to have an experi- mental comparison of the performances: one approach is based on the use of a constant-fraction discriminator followed by an on-pixel TDC, while the other one is based on the use of a Time- over-Threshold circuit followed by a TDC shared by a group of pixels.

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The BaBar Silicon Vertex Tracker

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001

The BaBar Silicon Vertex Tracker (SVT) is designed to provide the high-precision vertexing necess... more The BaBar Silicon Vertex Tracker (SVT) is designed to provide the high-precision vertexing necessary for making measurements of CP violation at the SLAC B-Factory PEP-II. The instrument consists of five layers of double-sided silicon strip detectors and has been installed in the BaBar experiment and taking colliding beam data since May 1999. An overview of the design as well as performance and experience from the initial running will be presented.

Search for direct CP violating charge asymmetries in K±→π±π+π- and K±→π±π0π0 decays

by A. Ramusino, R. Arcidiacono, and E. Swallow

The European Physical Journal C, 2007

... L. Widhalm15 1 Cavendish Laboratory, University of Cambridge, Cambridge, CB3 0HE, UKb 2 CERN,... more

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Recent NA48/2 and NA62 results

by Ferruccio Petrucci, A. Gianoli, M. Savrie, Massimiliano Fiorini, A. Ramusino, and Vito Palladino

The NA48/2 Collaboration at CERN has accumulated and analysed unprecedented statistics of rare ka... more The NA48/2 Collaboration at CERN has accumulated and analysed unprecedented statistics of rare kaon decays in the Ke4 modes: Ke4(+−) (K ± → π + π − e ± ν) and Ke4(00) (K ± → π 0 π 0 e ± ν) with nearly one percent background contamination. It leads to the improved measurement of branching fractions and detailed form factor studies. New final results from the analysis of 381 K ± → π ± γγ rare decay candidates collected by the NA48/2 and NA62 experiments at CERN are presented. The results include a decay rate measurement and fits to Chiral Perturbation Theory (ChPT) description.

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