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78 results on '"A Baschirotto"'

1. Design of a MEMS Optical Microphone Transducer Based on Light Phase Modulation

Author

de Milleri, Niccolo, Onaran, Guclu A., Wiesbauer, Andreas, and Baschirotto, Andrea

Abstract

Acoustic sensing through optical transduction represents a promising alternative to the conventional capacitive sensing used in MEMS microphones, especially when aiming at ultralow-noise applications. In fact, the traditional acoustic to electrical transduction stages are decoupled by the intermediate conversion of the signal into the optical domain. As a result, the mechanical design of the sensor has no direct influence on the electrical readout performance, and this allows for a significant reduction of the MEMS transducer noise through aggressive acoustically semi-transparent stator designs that represent one of the limits of the standard capacitive technologies. This article reports the design and the modeling of the sensing elements of a MEMS optical microphone. The basic transduction mechanism is presented, and the main design parameters and challenges are explained and analyzed with advanced modeling techniques; the measurement results are finally compared to the expected performance.

Published
2024
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2. A 22-dBA Digital Optical MEMS Microphone

Author

Milleri, Niccolo de, Valli, Luca, Fueldner, Marc, Wiesbauer, Andreas, and Baschirotto, Andrea

Abstract

The market and the applications of micro-electromechanical systems (MEMS)-based microphones have been in continuous growth over the last decades. This article presents a promising acoustic-sensing technology that mixes the consolidated MEMS technology with an innovative optical transduction technique of acoustic signals. The proposed method allows to significantly reduce the intrinsic noise of the system and to increase its signal-to-noise ratio (SNR). The designed digital optical microphone reaches an SNR of 71.6 dBA in a $5{\times } 5{\times } 2$ mm3 package with an output sensitivity of -21 dBFS/Pa. This article describes each section of the system-in-package (SiP) microphone, starting from the physics behind the transduction mechanism, covering the application-specified integrated circuit (ASIC) and package design, and the optical stack structure. A final analysis of the obtained experimental results is provided and compared with the state-of-art reported in the literature.

Published
2024
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3. Design and Evaluation of a 2Mbps SEC Transceiver for Automotive Networks

Author

D'Aniello, Federico, Ott, Andreas, and Baschirotto, Andrea

Abstract

In this brief, a Supply Embedded Communication (SEC) transceiver for automotive networks is proposed. In an SEC approach, power supply and communication take place on the same differential bus and thus the number of required cables is drastically reduced, leading to space, raw material consumption, and cost advantages. The proposed transceiver is realized in 180nm SOI CMOS technology and is capable of implementing 2Mbps high-speed networks. In addition to proving nominal transient operation, some critical aspects for an automotive application are analyzed. Electromagnetic compatibility (EMC) is evaluated by conducting emission tests, and finally, the robustness to external disturbances is tested by direct power injection (DPI) tests.

Published
2024
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4. 2.5A-Constant-Output-Current, Constant-Toff, 1.5 MHz, 89%-Efficiency Switching Converter

Author

Tettamanti, Marcello, Haller, Florian, Pidutti, Albino, Croce, Paolo Del, and Baschirotto, Andrea

Abstract

In this brief, a Constant-Output-Current, constant- $T_{off}$ , buck-mode switching converter is presented. The device uses a Peak Current Mode Control (PCMC) with an integrated High-Side (HS) current sensing and, with typical voltage regulator solutions, delivers a constant output current. The proposed concept is validated by an IC prototype in a $0.35 ~\mu \text{m}$ BCD process with an area of 0.56 mm2. The output current and the off-time values can be modified with external trimmers. It can regulate an output current from a minimum value of 700 mA to a maximum of 2.5 A. The highest current is reached with a switching frequency of 1.5 MHz. A maximum frequency of 3.3 MHz can be reached with an output current of 730 mA. The duty cycle can vary from 20% to 96%. A peak efficiency of 96.4% at 700 mA is obtained.

Published
2024
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5. Essderc–Esscirc 2022 [Conference Reports]

Author

Malcovati, Piero, Pandini, Davide, Puglisi, Francesco Maria, Giacomini, Davide, and Baschirotto, Andrea

Abstract

Provides society information that may include news, reviews or technical notes that should be of interest to practitioners and researchers.

Published
2023
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6. Power metallization degradation monitoring on power MOSFETs by means of concurrent degradation processes

Author

De Gasperi, Sergio, Nelhiebel, Michael, Haerle, Dieter, and Baschirotto, Andrea

Abstract

An on-chip solution for health monitoring of semiconductor power switches subjected to thermo-mechanical metal fatigue degradation is proposed. The fatigue detection relies on the correlation between the progress of the main failure mechanism, which is critical to the functionality of the device, and a parallel degradation of a non-critical sensing structure using a different mechanism. Both mechanisms are driven by the same cyclic thermo-mechanical load. This study specifically develops a sensing structure for detecting power metallization aging through electrically detectable ratcheting behavior in the routing metal layer underneath. Experiments have been carried out on a dedicated test structure with electrical sensing of the health monitoring structure. Meanwhile, the main degradation progress was observed via scanning electron microscopy in regular intervals. Results show that the proposed approach will reliably work only for detecting degradation driven by repeated high overload events.

Published
2022
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7. The GST domain of GDAP1 is a frequent target of mutations in the dominant form of axonal Charcot Marie Tooth type 2K

Author

Crimella, C., Tonelli, A., Airoldi, G., Baschirotto, C., D'Angelo, M.G., Bonato, S., Losito, L., Trabacca, A., Bresolin, N., and Bassi, M.T.

Subjects
Charcot-Marie-Tooth disease -- Genetic aspects, Charcot-Marie-Tooth disease -- Development and progression, Charcot-Marie-Tooth disease -- Research, Gene mutations -- Research, Gangliosides -- Genetic aspects, Gangliosides -- Research, Health
Published
2010

8. A locus on 15q15-15qter influences dyslexia: further support from a transmission/disequilibrium study in an Italian speaking population

Author

Marino, C., Giorda, R., Vanzin, L., Nobile, M., Lorusso, M.L., Baschirotto, C., Riva, L., Molteni, M., and Battaglia, M.

Subjects
Health
Abstract

J Med Genet 2004;41:42-46 Developmental dyslexia (dyslexia) is a heritable condition typically diagnosed in the first school years, characterised by an impairment of reading abilities in spite of normal intelligence [...]

Published
2004

9. A power line FSK transceiver with reduced power consumption

Author

Cappeletti, R. and Baschirotto, A.

Subjects
Power lines -- Models, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

A versatile low-power half-duplex FSK transceiver for power line communication network applications is presented. The proposed Power-Line Modem (PLM) satisfies the requirement of several protocols for power-line communications. The device operation is fully controlled and programmed through an internal 24bit register. It operates from a single 9V supply (5V is possible if no power delivery is required). During transmission, the PLM is able to deliver 1W on 16 [ohm], while during reception it dissipates only 3.5mA. The PLM is realized in a 0.6[micro]m BCD technology.

Published
2001

10. A compact-disc analog-to-digital front-end in BiCMOS technology

Author

Baschirotto, A., Brasca, G., Colonna, V., Cusinato, P., and Gandolfi, G.

Subjects
Consumer electronics -- Research, Electrical engineering -- Research, Chip sets (Computers) -- Research, Analog to digital converters -- Research, BiCMOS -- Research, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

A BiCMOS analog front-end to be used in a complete two-chip set with a digital signal processor for Compact Disc (CD) applications is presented. The proposed device exchanges data with the digital counterpart by means of a 12C-like bus serial interface. Four input signals (currents or voltages) are preamplified with flat group-delay and digitized with 6-bit (for servo path) and 8-bit (for RF path) accuracy. This accuracy is achieved without using an equalizer in the signal path. The system is designed to process CD signal with speed up to 4x (i.e. 3.2MHz bandwidth). The device is realized in a 0.7 [micro]m BiCMOS technology using 21.5[mm.sup.2] chip area.

Published
2000

11. A four-channel transimpedance amplifier for a Compact Disc front-end

Author

Baschirotto, Andrea

Subjects
Bandwidth -- Analysis, Compact disc players and recorders -- Design and construction, Amplifiers, Audio -- Design and construction, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

A four-channel transimpedance amplifier to be used in a Compact Disc front-end is presented. The overall transimpedance gain of the four channels is set by controlling the gain of a gain-controlled buffer. This solution requires for setting the gain of the four channels only one external precise resistor. The system has been realized in a 0.71[micro]m BiCMOS technology. It consumes 40mW from a single 5V supply and achieves 36dB SNR for an input signal with a 0-3.2MHz bandwidth, without requiring an equalizer in the signal path.

Published
2000

12. Proton-Induced Thermoacoustic Process as Linear-Time-Invariant System

Author

De Matteis, Marcello, Baschirotto, Andrea, Vallicelli, Elia, and Zanini, Emanuele

Abstract

This article presents a cross-domain model that defines and sets the acoustic signal generation process due to the fast dose deposition induced by a proton beam penetrating an energy absorber. The proposed model reduces the complex iono-acoustic energy transformation process to a simple impulse-response of a linear-time-invariant (LTI) system and is validated by comparing LTI output simulation results (in both time and frequency domain) with experimental acoustic signals emitted by a physical proton beam at 20 MeV and 70–120-ns pulse time width. Thanks to the intrinsic simplicity of the system, it is possible to predict and estimate the effective acoustic power at the sensor and the resultant beam range measurement precision. More importantly, the information coming from LTI simulations provides well-defined methodologies that allow to increase acoustic signal amplitude from +3 up to +9 dB and to improve the measurement precision of the beam range localization (up to +/ − 0.3 mm versus +/ − 0.6 mm state of the art for 200-MeV energy and 75-mGy total dose).

Published
2022
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13. Acoustic Analog Signal Processing for 20–200 MeV Proton Sound Detectors

Author

De Matteis, Marcello, Baschirotto, Andrea, and Vallicelli, Elia

Abstract

Proton sound detectors rely on sensing the weak thermoacoustic signals emitted by the fast energy deposition at the end of the beam penetration path through the energy absorber. The energy of the ions/protons is first converted into heat, and then, into pressure by a thermodynamic process. The pressure signal propagates through the energy absorber, and it is read by an acoustic sensor, which, in turn, converts the pressure wave into an analog electrical voltage. Such an analog signal is digitalized by the analog front-end. Its digital representation is used for the measurement of the beam depth. This emerging technique attracts attention in both physics experiments and medical applications (hadron therapy). This article investigates the signal-to-noise-ratio performance in proton sound detectors exploring all critical steps that lead to both reduction of the power of the electrical signal and noise power increasing. Nonetheless, this article proposes specific technical solutions to mitigate such signal-to-noise-ratio degradations with particular attention to higher energy (i.e., 200 MeV) proton beams, which are crucial for medical applications, and where the maximum achievable signal-to-noise ratio can be 50/60 dB lower than 20 MeV acoustic pulses.

Published
2022
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14. SC realization of antialiasing CCIR-601 video filters

Author

Cortelazzo, G.M., Malavasi, E., Segato, M., Baschirotto, A., and Biaggioni, G.

Subjects
Switched capacitor circuits -- Research, Video equipment -- Research, Digital filters -- Research, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

Switched-Capacitor circuits as discrete-time analog devices are especially suited for the signal processing tasks occurring when interfacing analog and digital systems. The major obstacle towards the use of standard CMOS technology for SC video filters is the limited speed of high-gain CMOS op-amps. This limitation however can be overcome with some design ingenuity, as in the application considered in this work. Recommendation CCIR-601 prescribes to prefilter luminance and color-difference signals with filters characterized by tight group-delay specifications. In this work we consider the realization of the color difference prefilter [H.sub.a](s), which is currently available only in discrete-component (and therefore very expensive) implementations, with an equivalent system formed by the cascade of two integrated filters, namely a continuous-time filter [H.sub.1](s) and a SC filter H(z). This type of implementation can be applied to the luminance prefilter as well. Since CCIR Recommendation 601 prefilters are at the front-end of every digital television system, there are opportunities for their large-scale production within which the economical advantages of the proposed integrated solution are apparent.

Published
1994

16. 22 dB Signal-to-Noise Ratio Real-Time Proton Sound Detector for Experimental Beam Range Verification.

Author

Vallicelli, Elia Arturo, Baschirotto, Andrea, Lehrack, Sebastian, Assmann, Walter, Parodi, Katia, Viola, Salvatore, Riccobene, Giorgio, and De Matteis, Marcello

Subjects
*PROTON beams, *SIGNAL-to-noise ratio, *PROTONS, *DETECTORS, *PARTICLE beams, *TANKS, *PROTON-proton interactions
Abstract

This paper presents the design and experimental characterization of a Proton Sound Detector (ProSD), a device that physically captures and senses the weak acoustic signal emitted by the fast energy deposition at the end of the same proton beam range. The measured acoustic signal Time-of-Flight provides a very accurate ($13~\mu \text{m}$ accuracy) measure of the proton beam penetration depth in water, improving the proton range verification accuracy w.r.t. previous works in pre-clinical scenarios. This suggests interesting possibilities for high-accuracy and real-time beam monitoring and calibration in hadron-therapy for cancer treatment. The detector has been fully characterized and tested with a physical 20 MeV proton beam in a water energy absorber. The ProSD and the water tank have been mounted in front of the exit layer of a 20 MeV 120 ns pulse time-width proton beam. A clear sinusoidal-like acoustic signal of 5 Pa and 2.3 MHz frequency has been detected at 12 dB SNR with 0.8 Gy single shot dose. After averaging 10 beam shots the achieved Signal-to-Noise-Ratio is 22 dB allowing a $\pm 7.5~\mu \text{m}$ precision vs. previously reported $\pm 45~\mu \text{m}$ ionoacoustic precision. [ABSTRACT FROM AUTHOR]

Published
2021
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17. Switching opioid-dependent patients in substitution treatment from racemic methadone, levomethadone and buprenorphine to slow-release oral morphine: Analysis of the switching process in routine care

Author

Baschirotto, Cinzia, Lehmann, Kirsten, Kuhn, Silke, Reimer, Jens, and Verthein, Uwe

Abstract

Since 2015 slow-release oral morphine (SROM) is approved for opioid substitution treatment (OST) in Germany. The SROMOS study (efficacy and tolerability of slow-release oral morphine in opioid substitution treatment) evaluates the efficacy and safety of SROM in routine care. This article describes the switching process from racemic methadone, levomethadone and buprenorphine to SROM.

Published
2020
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18. 50-Channel Ionoacoustic Sensor for 60 MeV Proton Beam Characterization in Hadron Therapy Applications

Author

Vallicelli, Elia Arturo, Tambaro, Mattia, Cosmi, Mattia Oliver, Baschirotto, Andrea, and De Matteis, Marcello

Abstract

This paper presents the design of a piezoelectric multichannel sensor optimized for sensing weak ionoacoustic signals generated at the Bragg peak (BP) of pulsed proton beams, with interesting possible applications in real-time monitoring of oncological hadron therapy treatments. To overcome current single-channel detector limitations and acquire the weak acoustic signals of clinical scenarios (60–200 MeV proton energy and few mGy dose deposition), the hereby presented detector overcomes the state-of-the-art approach (based on time-domain correlation i.e., averaging different beam pulses) by using spatial correlation (i.e., averaging signals from different detector channels) to increase the SNR without increasing the delivered dose. The detector design is tailored around the experimental environment characteristics (signal amplitude, signal frequency, relative BP-detector position) of a clinical proton beam (60 MeV, 2 mGy/pulse dose deposition). The detector design was characterized by a complete cross-domain simulation of the physical (proton beam), acoustic (wave propagation) and electrical (sensor and electronics frequency response and noise) environments. It achieves a clear 10 dB single-pulse SNR (2 mGy total dose) and allows to locate the BP with 125 μm precision (< 3% w.r.t. the particle range). Finally, the detector was experimentally validated by a piezoelectric acoustic testbench and has shown the capability to localize an acoustic source in 2D with sub-millimeter accuracy by using a multilateration-based BP detection algorithm.

Published
2024
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19. GPU-based physical cut in interactive haptic simulations

Author

Zerbato, Davide, Baschirotto, Daniele, Baschirotto, Davide, Botturi, Debora, and Fiorini, Paolo

Abstract

Abstract: Purpose: Interactive, physics based, simulations of deformable bodies are a growing research area with possible applications to computer-aided surgery. Their aim is to create virtual environments where surgeons are free to practice. To ensure the needed realism, the simulations must be performed with deformable bodies. The goal of this paper is to describe the approach to the development of a physics-based surgical simulator with haptic feedback. Method: The main development issue is the representation of the organ behavior at the high rates required by haptic realism. Since even high-end computers have inadequate performance, our approach exploits the parallelism of modern Graphics Processing Units (GPU). Particular attention is paid to the simulation of cuts because of their great importance in the surgical practice and the difficulty in handling topological changes in real time. Results: To prove the correctness of our approach, we simulated an interactive, physically based, virtual abdomen. The simulation allows the user to interact with deformable models. Deformable models are updated in real time, thus allowing the rendering of force feedback to the user. The method is optimized to handle high quality scenes: we report results of interactive simulation of two virtual tools interacting with a complex model. Conclusions: The integration of physics-based deformable models in simulations greatly increases the realism of the virtual environment, taking into account real tissue properties and allowing the user to feel the actual forces exerted by organs on virtual tools. Our method proves the feasibility of exploiting GPU to simulate deformable models in interactive virtual environments.

Published
2011
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20. UHF front‐end feeding RFID‐based body sensor networks by exploiting the reader signal

Author

Pasca, M., Colella, R., Catarinucci, L., Tarricone, L., D'Amico, S., and Baschirotto, A.

Abstract

This paper presents an integrated, high‐sensitivity UHF radio frequency identification (RFID) power management circuit for body sensor network applications. The circuit consists of a two‐stage RF‐DC Dickson's rectifier followed by an integrated five‐stage DC‐DC Pelliconi's charge pump driven by an ultralow start‐up voltage LC oscillator. The DC‐DC charge pump interposed between the RF‐DC rectifier and the output load provides the RF to load isolation avoiding losses due to the diodes reverse saturation current. The RF‐DC rectifier has been realized on FR4 substrate, while the charge pump and the oscillator have been realized in 180 nm complementary metal oxide semiconductor (CMOS) technology. Outdoor measurements demonstrate the ability of the power management circuit to provide 400 mV output voltage at 14 m distance from the UHF reader, in correspondence of −25 dBm input signal power. As demonstrated in the literature, such output voltage level is suitable to supply body sensor network nodes. A power management circuit suitable to power body sensor network nodes exploiting the energy from a UHF reader is presentedIt is made by an initial RF‐DC rectifier followed by a charge pump that allows to isolate the output load from the input RF sourceIndoor and outdoor measurements have been performed in order to validate the presented mathematical model of the circuit

Published
2016
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21. A 40-nm CMOS, 1.1-V, 101-dB Dynamic-Range, 1.7-mW Continuous-Time \Sigma\Delta ADC for a Digital Closed-Loop Class-D Amplifier.

Author

Donida, Achille, Cellier, Remy, Nagari, Angelo, Malcovati, Piero, and Baschirotto, Andrea

Subjects
ELECTRONIC modulators, RADIO transmitters & transmission, PULSE circuits, COMPLEMENTARY metal oxide semiconductors, DISTRIBUTED amplifiers, SIGNAL-to-noise ratio
Abstract

This paper presents a continuous-time third-order \Sigma\Delta modulator designed for closing the feedback loop of a digital class-D audio amplifier. The closed-loop digital class-D amplifier fully exploits the potential of the used 40-nm CMOS technology to achieve at the same time the flexibility of digital implementations and the performance of analog solutions. The proposed \Sigma\Delta modulator consumes 1.7 mW from a 1.1-V power supply, achieving 101-dB dynamic-range (DR) and 72-dB peak signal-to-noise and distortion ratio (SNDR). The active-RC implementation allows the 1.1-V \Sigma\Delta modulator inputs to be directly connected to the 5-V class-D amplifier power stage outputs and inherently guarantees third-order anti-aliasing filtering. [ABSTRACT FROM AUTHOR]

Published
2015
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22. A Digitally Modulated Class-E Polar Amplifier in 90 nm CMOS.

Author

Chironi, Vincenzo, Debaillie, Bjorn, D'Amico, Stefano, Baschirotto, Andrea, Craninckx, Jan, and Ingels, Mark

Subjects
ELECTRONIC modulation, POWER amplifiers, AMPLITUDE modulation, AMPLITUDE modulation detectors, MODULATION theory
Abstract

In this paper a digital amplitude modulator for a polar transmitter is presented. The instantaneous output power is modulated by adjusting the amplifiers load through a digitally controlled impedance transformation network. The modulator is suited for modulation schemes with moderate peak-to-average power ratio (PAPR), such as \pi/4 DQPSK. The modulator may also be used for fine gain control in constant envelope modulation schemes. A class E amplifier with digital impedance amplitude modulation is integrated in 90 nm CMOS. It achieves a peak output power of 9 dBm with a PAE of 30% when powered from a 1.2 V supply. The measured EVM is 2.6% for a 6 dBm \pi/4 DQPSK modulated signal with 2 Mb/s signal rate at 2.4 GHz RF frequency. [ABSTRACT FROM PUBLISHER]

Published
2013
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23. A 255 MHz Programmable Gain Amplifier and Low-Pass Filter for Ultra Low Power Impulse-Radio UWB Receivers.

Author

D'Amico, S., De Blasi, M., De Matteis, M., and Baschirotto, A.

Subjects
ELECTRONIC amplifiers, ELECTRONICS, AMPLIDYNES, COMPLEMENTARY metal oxide semiconductors, DIGITAL electronics
Abstract

A 90 nm-CMOS power-optimized analog baseband chain for ultra-low-power impulse-radio ultra-wideband (IR-UWB) receivers is presented. The proposed device merges the functions of a programmable gain amplifier (PGA) and a low-pass filter (LPF). It consists of the cascade of three biquadratic cells made up by opamps in a series-shunt configuration, which features high input impedance, low load effects in the cascade blocks, and better frequency response. The opamp parameters are included in the overall biquad transfer function. This allows getting very low power performance, since the opamp bandwidth is not required to be much larger than the filter cutoff frequency. Moreover, the current consumption is optimized according to the selected gain level (1.3 mA at 0 dB-gain up to 1.9 mA at 40 dB-gain). The PGA features a 0-40 dB programmable gain range with a 5 dB gain-step. The LPF performs a sixth-order 255 MHz low-pass frequency response. For the overall chain the IIP3 is 14 dBm at 0 dB gain, while the input referred noise is 12.5 nV/√Hz at 40 dB gain. [ABSTRACT FROM AUTHOR]

Published
2012
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24. Cryptogenic Epileptic Syndromes Related to SCN1A: Twelve Novel Mutations Identified

Author

Zucca, Claudio, Redaelli, Francesca, Epifanio, Roberta, Zanotta, Nicoletta, Romeo, Antonino, Lodi, Monica, Veggiotti, Pierangelo, Airoldi, Giovanni, Panzeri, Chris, Romaniello, Romina, De Polo, Gianni, Bonanni, Paolo, Cardinali, Simonetta, Baschirotto, Cinzia, Martorell, Loreto, Borgatti, Renato, Bresolin, Nereo, and Bassi, Maria Teresa

Abstract

BACKGROUND Sodium channel alpha 1 subunit gene, SCN1A, is the gene encoding the neuronal voltage-gated sodium channel α 1 subunit (Nav1.1) and is mutated in different forms of epilepsy. Mutations in this gene were observed in more than 70% of patients with severe myoclonic epilepsy of infancy (SMEI) and were also found in different types of infantile epileptic encephalopathy. OBJECTIVE To search for disease-causing mutations in SCN1A in patients with cryptogenic epileptic syndromes (ie, syndromes with an unknown cause). DESIGN Clinical characterization and molecular genetic analysis of a cohort of patients. SETTING University hospitals, rehabilitation centers, and molecular biology laboratories. PATIENTS Sixty unrelated patients with cryptogenic epileptic syndromes. MAIN OUTCOME MEASURES Samples of DNA were analyzed for mutations and for large heterozygous deletions encompassing the SCN1A gene. A search for microdeletions in the SCN1A gene was also performed in the subset of patients with SMEI/SMEI-borderland who had negative results at the point mutation screening. RESULTS No large deletions at the SCN1A locus were found in any of the patients analyzed. In contrast, 13 different point mutations were identified in 12 patients: 10 with SMEI, 1 with generalized epilepsy with febrile seizures plus, and 1 with cryptogenic focal epilepsy. An additional search for SCN1A intragenic microdeletions in the remaining patients with SMEI/SMEI-borderland and no point mutations was also negative. CONCLUSIONS These results confirm the role of the SCN1A gene in different types of epilepsy, including cryptogenic epileptic syndromes. However, large deletions encompassing SCN1A were not common disease-causing rearrangements in this group of epilepsies.Arch Neurol. 2008;65(4):489-494--

Published
2008
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25. Tuning of High-Speed Telecommunication Filters, via I/O Cross-Correlation Evaluation.

Author

Corsi, Francesco, Matarrese, Gianvito, Marzocca, Cristoforo, Dragone, Angelo, Baschirotto, Andrea, and D'Amico, Stefano

Subjects
CONTINUOUS-time filters, SIGNAL processing, SIGNAL theory, INTEGRATED circuits, ELECTRIC filters, TELECOMMUNICATION
Abstract

Continuous-time (CT) filters are widely used in signal processing but, owing to the large spread in the process parameters which determine their time constants, they require a tuning system to align their frequency characteristics. Several techniques have already been proposed in the literature and are commonly employed, but usually they require either a doubling of the filter circuitry or some complex self-calibration scheme, resulting in sensible area overhead or high computational complexity. Here, we present a novel tuning approach which can be applied to both master-slave and self-calibration arrangements and is based on the evaluation of a few samples of the input-output cross-correlation function of the filter, when the input signal is a finite length sequence of pseudorandom pulses. The key advantages of the proposed technique are basically the ease of generation of the input bit-stream and the simplicity of the circuitry required to sample the filter output and to perform the cross-correlation operation. As a consequence, the area overhead associated to the tuning circuitry is kept very small. Some simulation results of the application to the tuning of a low-Q telecommunication filter are given and an extension to the tuning of high-Q active filters is also explored in order to assess the effectiveness and robustness of the proposed technique. [ABSTRACT FROM AUTHOR]

Published
2007
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26. A 1.2- V 30.4-dBm OIP3 Reconfigurable Analog Baseband Channel for UMTS/WLAN Transmitters.

Author

Ghittori, Nicola, Vigna, Andrea, Malcovati, Piero, D'Amico, Stefano, and Baschirotto, Andrea

Subjects
MOBILE communication systems, TELECOMMUNICATION systems, WIRELESS LANs, LOCAL area networks, WIRELESS communications, DIGITAL-to-analog converters, DIGITAL electronics, RADIO transmitter-receivers
Abstract

This paper presents a reconfigurable universal mobile telecommunication systems [(UMTS) and wireless local area network (WLAN) mode)] analog baseband transmitter channel composed of a current steering digital-analog converter (DAC), a transimpedance stage, and a low-pass reconstruction filter. The device operates from a single 1.2-V supply voltage while guaranteeing the high-linearity UMTS/WLAN standard requirements. It can be digitally programmed to process WLAN 802.11a/b/g and UMTS signals, by adjusting the DAC conversion frequency and the low-pass filter cutoff frequency. For the WLAN mode, the DAC operating frequency and the filter bandwidth are set to 100 and 11 MHz, respectively, while for the UMTS mode, they are equal to 50 and 2.11 MHz. The device is realized in a 1.2-V 0.13-μm standard CMOS technology. The die area occupation, equal to 0.9 mm², has been minimized by optimizing the component sharing for the two operation modes. The proposed circuit achieves a 30.4 dBm third-order output referred intermodulation intercept point (OIP3) for the WLAN mode, and a 31.5 dBm-OIP3 when configured for the UMTS mode, while the spurious-free dynamic range is 58 dB for WLAN mode, and 60 dB for UMTS mode. The power consumption is optimized according to the operation mode and is 19.44 mW in WLAN mode and 16.8 mW in UMTS mode. [ABSTRACT FROM AUTHOR]

Published
2006
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27. Eight Novel Mutations in SPG4 in a Large Sample of Patients With Hereditary Spastic Paraplegia

Author

Crippa, Francesca, Panzeri, Chris, Martinuzzi, Andrea, Arnoldi, Alessia, Redaelli, Francesca, Tonelli, Alessandra, Baschirotto, Cinzia, Vazza, Giovanni, Mostacciuolo, Maria Luisa, Daga, Andrea, Orso, Genny, Profice, Paolo, Trabacca, Antonio, D’Angelo, Maria Grazia, Comi, Giacomo Pietro, Galbiati, Sara, Lamperti, Costanza, Bonato, Sara, Pandolfo, Massimo, Meola, Giovanni, Musumeci, Olimpia, Toscano, Antonio, Trevisan, Carlo Pietro, Bresolin, Nereo, and Bassi, Maria Teresa

Abstract

BACKGROUND Hereditary spastic paraplegia (HSP) is a group of genetically heterogeneous disorders characterized by progressive spasticity of the lower limbs. Mutations in the SPG4 gene, which encodes spastin protein, are responsible for up to 45% of autosomal dominant cases. OBJECTIVE To search for disease-causing mutations in a large series of Italian patients with HSP. DESIGN Samples of DNA were analyzed by direct sequencing of all exons in SPG4. Samples from a subset of patients were also analyzed by direct sequencing of all exons in SPG3A, SPG6, SPG10, and SPG13. SETTING Molecular testing facility in Italy. PATIENTS Sixty unrelated Italian patients with pure (n = 50) and complicated (n = 10) HSP. MAIN OUTCOME MEASURES Mutations in SPG4, SPG3A, SPG6, SPG10, and SPG13. RESULTS We identified 12 different mutations, 8 of which were novel, in 13 patients. No mutations of any of the other HSP genes tested were found in 15 patients with sporadic pure HSP who did not have mutations in the SPG4 gene. CONCLUSIONS The overall rate of mutation in the SPG4 gene within our sample was 22%, rising to 26% when only patients with pure HSP were considered. The negative result obtained in 15 patients without mutations in SPG4 in whom 4 other genes were analyzed (SPG3A, SPG6, SPG10, and SPG13) indicate that these genes are not frequently mutated in sporadic pure HSP.Arch Neurol. 2006;63:750-755 --

Published
2006
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28. A Low-Power Reconfigurable Analog Filter for UMTS/WLAN Receivers

Author

D'amico, Stefano, Giannini, Vito, and Baschirotto, Andrea

Abstract

A low-power analog filter able to be reconfigured in order to be used in UMTS and WLAN applications is reported. The 4th order low-pass continuous-time filter is going to be included in the receiver path of a reconfigurable terminal. The filter is made up by the cascade of two Active-G$_m$-RC low-pass biquadratic cells. The unity-gain-bandwidth of the opamps embedded in the Active-G$_m$-RC cells is comparable to the filter cut-off frequency. Thus, the power consumption of the opamp can be strongly reduced. In addition, the filter can be programmed in order to process UMTS and WLAN signals, while a little area overhead is required since the filter can share capacitors as well as opamps in both operations modes. The cut-off frequency deviation due to the technological spread, aging and temperature variation is adjusted by using a tuning circuit.The full device in a 0.13 μ$m CMOS technology occupies a 2.8 mm2area.

Published
2006
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29. Active-Gm-RC Continuous-Time Biquadratic Cells

Author

D'Amico, Stefano and Baschirotto, Andrea

Abstract

Abstract An analog CMOS low-pass Active-Gm-RC biquadratic cell is presented. The cell combines the advantage of GM-C filters (no parasitic poles) with the advantages of Active-RC filter (large linear range). Two additional digital-based circuits allow to control the pole frequency and to reduce the effects of the non-dominant poles. A 4th order low-pass Butterworth filter with a 2.11 MHz cut-off frequency and a DC-gain of 32 dB for UMTS receiver has been designed in a 0.18 μm CMOS technology with 1.8 V supply voltage. The filter exhibits a −93 dBV input-referred noise with a power consumption of 2.16 mW while the linearity performances corresponds to an in-band IIP3 of 4 dBm and an out-of-band IIP3 of 35 dBm. An Active Gm-RC band-pass cell is presented as possible alternative application.

Published
2005
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30. A novel mutation in KCNQ2 associated with BFNC, drug resistant epilepsy, and mental retardation

Author

Borgatti, R., Zucca, C., Cavallini, A., Ferrario, M., Panzeri, C., Castaldo, P., Soldovieri, M.V., Baschirotto, C., Bresolin, N., Bernardina, B. Dalla, Taglialatela, M., and Bassi, M.T.

Abstract

Benign familial neonatal convulsion (BFNC) is a rare autosomal dominant disorder caused by mutations in two genes, KCNQ2 and KCNQ3, encoding for potassium channel subunits underlying the M-current. This current limits neuronal hyperexcitability by causing spike-frequency adaptation.

Published
2004

31. Self-Tuning Algorithms for High-Performance Bandpass Switched-Capacitor ΣΔ Modulators.

Author

Gandolfi, G., Colonna, V., Annovazzi, M., Stefani, E, and Baschirotto, A.

Subjects
SWITCHED capacitor circuits, CAPACITORS, BANDWIDTHS, ELECTRONIC circuits, ALGORITHMS, DIGITAL communications
Abstract

Switched-capacitor high-frequency bandpass ΣΔ modulators could suffer from capacitor mismatch, finite opamp de gain, and finite opamp bandwidth. These problems make the notch frequency and the quality factor of the zeros of the noise transfer function to deviate from their nominal values, strongly affecting the modulator dynamic range (DR). In order to avoid this situation, two sampled-data algorithms have been developed which allow to self-calibrate the bandpass ΣΔ modulators. They use 3500 gate and 0.043 mm² area and consume power only when they are active, while, when the system is on, they are off and do not interfere with standard operation. The validity of the proposal Is demonstrated by a silicon prototype in which the proposed solution allows to guarantee a 75-dB DR performance also under worst case conditions. In the particular case, it allows for the recovery of 3 dB in the SNR for the 200-kHz FM band (from 73 to 76 dB). [ABSTRACT FROM AUTHOR]

Published
2004
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32. Technology-Driven Alternatives for Smart Sensor Interfaces

Author

Baschirotto, A. and Malcovati, P.

Abstract

The importance of integrated microsystems is continuously growing because of the combination of two trends: the progress of silicon sensor technology and the introduction of new techniques for interface circuits. In this chapter we show how different approaches to the implementation of smart sensor systems, basically driven by the available fabrication technologies, can lead to successful designs. Three examples are presented: a fully integrated current monitor, a biaxial accelerometer, and a rotational accelerometer. The current monitor is an example of single chip implementation. It supports two different operating ranges (20 A and 200 A full scale), provides digitally programmable gain and offset with an on-chip PROM, and achieves 9 bits of resolution and ± 0.6 LSB of linearity. The biaxial accelerometer and the rotational accelerometer are examples of implementations based on two chips in the same package. They achieve 80 dB of dynamic range with ± 1 g full-scale signal over a 30 Hz bandwidth and 38 dB of dynamic range with 200 rad/s2 full-scale signal over an 800 Hz bandwidth.

Published
2003
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33. Digital Technique for Instability Detection and Saturation Recovery in High-Order SC ΣΔ Modulators

Author

Cusinato, P., Pasolini, F., Stefani, F., and Baschirotto, A.

Abstract

Stability and saturation recovery are a key concern in High-order Switched Capacitor (SC) ΣΔ modulators, since they are conditionally stable architectures. A novel digital technique, which allows to detect instability in the digital domain, a fast recover of high-order modulators from instability and guarantees a minimum of Signal-to-Noise Ratio (SNR) also when the architecture gets unstable, is proposed. This technique operates in two steps: first, the instability is detected in the digital domain and the system is recovered to a proper operation and then a digital post-processing is performed in order to achieve a residual SNR also in the instability condition. This strategy has been applied to a 6th-order SC bandpass ΣΔ modulator operating at 42.8 MHz and featuring 74 dB Dynamic Range (DR) in a 200 kHz bandwidth. The benchmark modulator has been integrated in a standard double-poly 0.35 μm 3.3 V CMOS technology with five metal layers.

Published
2003
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34. Effective Retrovirus-Mediated Gene Transfer in Normal and Mutant Human Melanocytes

Author

Schiaffino, Maria Vittoria, Dellambra, Elena, Cortese, Katia, Baschirotto, Cinzia, Bondanza, Sergio, Clementi, Maurizio, Nucci, Paolo, Ballabio, Andrea, Tacchetti, Carlo, and De Luca, Michele

Abstract

Melanocytes represent the second most important cell type in the skin and are primarily responsible for the pigmentation of skin, hair, and eyes. Their function may be affected in a number of inherited and acquired disorders, characterized by hyperpigmentation or hypopigmentation, consequent aesthetic problems, and increased susceptibility to sun-mediated skin damage and photocarcinogenesis. Nevertheless, the possibility of genetically manipulating human melanocytes has been hampered so far by a number of limitations, including their resistance to retroviral infection. To address the problem of human melanocyte transduction, we generated a melanocyte culture from a patient affected with ocular albinism type 1 (OA1), an X-linked pigmentation disorder, characterized by severe reduction of visual acuity, retinal hypopigmentation, and the presence of macromelanosomes in skin melanocytes and retinal pigment epithelium (RPE). The cultured patient melanocytes displayed a significant impairment in replication ability and showed complete absence of endogenous OA1 protein, thus representing a suitable model for setting up an efficient gene transfer procedure. To correct the genetic defect in these cells, we used a retroviral vector carrying the OA1 cDNA and exploited a melanocyte-keratinocyte coculturing approach. Despite their lower replication rate with respect to wildtype cells, the patient melanocytes were efficiently transduced and readily selected in vitro, and were found to express, process, and properly sort large amounts of recombinant OA1 protein. These results indicate the feasibility of efficiently and stably transducing in vitro not only normal neonatal, but also mutant adult, human melanocytes with nonmitogenic genes.

Published
2002
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35. Low-voltage rail-to-rail switched buffer topologies

Author

Ferri, Giuseppe and Baschirotto, Andrea

Abstract

This paper presents some CMOS rail-to-rail low-voltage (1.2 V) switched buffer topologies, to be used as input stages in switched-opamp circuits. The main buffer is based on the use of an op-amp featuring rail-to-rail input and output swing with constant transconductance over the input common mode voltage. The designed buffer exhibits a total harmonic distortion of about -61 dB for 5 MHz clock frequency with 2 Vpp input amplitude. Its characteristics have been compared with those of other rail-to-rail switched buffers, based on the main CMOS OTA (simple, symmetrical, Miller), showing good distortion even at frequencies in the MHz range and satisfying the requirements for the series switches. Copyright © 2001 John Wiley & Sons, Ltd.

Published
2001

39. Low-voltage fully differential switched-opamp bandpass ΣΔ modulator

Author

Baschirotto, A. and Castello, R.

Abstract

The paper deals with the design of a low-voltage bandpass ΣΔ modulator implemented with the switched-capacitor technique. To use standard technology (no low-threshold devices) and without an on-chip voltage multiplier, the switched-opamp technique has been adopted. The basic building blocks for the construction of a ΣΔ modulator (SC integrator, quantiser, and feedback DAC) are proposed in a fully differential version. In addition, they have been improved with respect to those previously reported to give a larger output swing at a higher sampling frequency and without any voltage reference. The validity of the proposed circuits is demonstrated by the realisation of a second-order bandpass ΣΔ modulator operating with a single 1 V supply within a standard 0.5 µm CMOS technology (VTHn = 0.65 V, VTHp = 0.7 V). The modulator operates at a sampling frequency of 1.8 MHz with a full-scale input range of 2 Vpk-pk and achieves a 45 dB dynamic range in a 20 kHz bandwidth.

Published
1999

40. Measurement of cross sections and leptonic forward-backward asymmetries at theZ pole and determination of electroweak parameters

Author

Acciarri, M., Adam, A., Adriani, O., Aguilar-Benitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M. G., Ambrosi, G., An, Q., Anderhub, H., Anderson, A. L., Andreev, V. P., Angelescu, T., Antonov, L., Antreasyan, D., Alkhazov, G., Arce, P., Arefiev, A., Azemoon, T., Aziz, T., Baba, P. V. K. S., Bagnaia, P., Bakken, J. A., Baksay, L., Ball, R. C., Banerjee, S., Banicz, K., Bao, J., Barillère, R., Barone, L., Baschirotto, A., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Bencze, Gy. L., Berdugo, J., Berges, P., Bertucci, B., Betev, B. L., Biasini, M., Biland, A., Bilei, G. M., Bizzarri, R., Blaising, J. J., Bobbink, G. J., Bock, R., Böhm, A., Borgia, B., Bourilkov, D., Bourquin, M., Boutigny, D., Bouwens, B., Brambilla, E., Branson, J. G., Brigljevic, V., Brock, I. C., Brooks, M., Bujak, A., Burger, J. D., Burger, W. J., Burgos, C., Busenitz, J., Buytenhuijs, A., Bykov, A., Cai, X. D., Capell, M., Caria, M., Carlino, G., Cartacci, A. M., Casaus, J., Castello, R., Cavallo, N., Cerrada, M., Cesaroni, F., Chamizo, M., Chang, Y. H., Chaturvedi, U. K., Chemarin, M., Chen, A., Chen, C., Chen, G., Chen, G. M., Chen, H. F., Chen, H. S., Chen, M., Chiefari, G., Chien, C. Y., Choi, M. T., Chung, S., Civinini, C., Clare, I., Clare, R., Coan, T. E., Cohn, H. O., Coignet, G., Colino, N., Contin, A., Costantini, S., Cotorobai, F., de la Cruz, B., Cui, X. T., Cui, X. Y., Dai, T. S., D'Alessandro, R., de Asmundis, R., Degré, A., Deiters, K., Dénes, E., Denes, P., DeNotaristefani, F., DiBitonto, D., Diemoz, M., Dimitrov, H. R., Dionisi, C., Dittmar, M., Djambazov, L., Dova, M. T., Drago, E., Duchesneau, D., Duinker, P., Duran, I., Easo, S., Mamouni, H. El, Engler, A., Eppling, F. J., Erné, F. C., Extermann, P., Fabbretti, R., Fabre, M., Falciano, S., Fan, S. J., Favara, A., Fay, J., Felcini, M., Ferguson, T., Fernandez, D., Fernandez, G., Ferroni, F., Fesefeldt, H., Fiandrini, E., Field, J. H., Filthaut, F., Fisher, P. H., Forconi, G., Fredj, L., Freudenreich, K., Friebel, W., Fukushima, M., Gailloud, M., Galaktionov, Yu., Gallo, E., Ganguli, S. N., Garcia-Abia, P., Gentile, S., Gheordanescu, N., Giagu, S., Goldfarb, S., Gong, Z. F., Gonzalez, E., Gougas, A., Goujon, D., Gratta, G., Gruenewald, M. W., Gu, C., Guanziroli, M., Guo, J. K., Gupta, V. K., Gurtu, A., Gustafson, H. R., Gutay, L. J., Hangarter, K., Hasan, A., Hauschildt, D., He, C. F., He, J. T., Hebbeker, T., Hebert, M., Hervé, A., Hilgers, K., Hofer, H., Hoorani, H., Hou, S. R., Hu, G., Hu, G. Q., Ille, B., Ilyas, M. M., Innocente, V., Janssen, H., Jin, B. N., Jones, L. W., Josa-Mutuberria, I., Kasser, A., Khan, R. A., Kamyshkov, Yu., Kapinos, P., Kapustinsky, J. S., Karyotakis, Y., Kaur, M., Khokhar, S., Kienzle-Focacci, M. N., Kim, J. K., Kim, S. C., Kim, Y. G., Kinnison, W. W., Kirkby, A., Kirkby, D., Kirsch, S., Kittel, W., Klimentov, A., König, A. C., Koffeman, E., Kornadt, O., Koutsenko, V., Koulbardis, A., Kraemer, R. W., Kramer, T., Krastev, V. R., Krenz, W., Kuijten, H., Kumar, K. S., Kunin, A., Ladron de Guevara, P., Landi, G., Lanske, D., Lanzano, S., Lebedev, A., Lebrun, P., Lecomte, P., Lecoq, P., Le Coultre, P., Lee, D. M., Lee, J. S., Lee, K. Y., Leedom, I., Leggett, C., Le Goff, J. M., Leiste, R., Lenti, M., Leonardi, E., Levtchenko, P., Li, C., Li, H. T., Li, P. J., Liao, J. Y., Lin, W. T., Lin, Z. Y., Linde, F. L., Lindemann, B., Lista, L., Liu, Y., Lohmann, W., Longo, E., Lu, W., Lu, Y. S., Lubbers, J. M., Lübelsmeyer, K., Luci, C., Luckey, D., Ludovici, L., Luminari, L., Lustermann, W., Ma, J. M., Ma, W. G., MacDermott, M., Malgeri, L., Malik, R., Malinin, A., Maña, C., Maolinbay, M., Marchesini, P., Marion, F., Marin, A., Martin, J. P., Marzano, F., Massaro, G. G. G., Mazumdar, K., McBride, P., McMahon, T., McNally, D., Merk, M., Merola, L., Meschini, M., Metzger, W. J., Mi, Y., Mihul, A., Mills, G. B., Mir, Y., Mirabelli, G., Mnich, J., Möller, M., Monteleoni, B., Morand, R., Morganti, S., Moulai, N. E., Mount, R., Müller, S., Nagy, E., Napolitano, M., Nessi-Tedaldi, F., Newman, H., Niaz, M. A., Nippe, A., Nowak, H., Organtini, G., Pandoulas, D., Paoletti, S., Paolucci, P., Pascale, G., Passaleva, G., Patricelli, S., Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Pei, Y. J., Pensotti, S., Perret-Gallix, D., Perrier, J., Pevsner, A., Piccolo, D., Pieri, M., Pinto, J. C., Piroué, P. A., Plasil, F., Plyaskin, V., Pohl, M., Pojidaev, V., Postema, H., Qi, Z. D., Qian, J. M., Qureshi, K. N., Raghavan, R., Rahal-Callot, G., Rancoita, P. G., Rattaggi, M., Raven, G., Razis, P., Read, K., Redaelli, M., Ren, D., Ren, Z., Rescigno, M., Reucroft, S., Ricker, A., Riemann, S., Riemers, B. C., Riles, K., Rind, O., Rizvi, H. A., Ro, S., Robohm, A., Rodriguez, F. J., Roe, B. P., Röhner, M., Röhner, S., Romero, L., Rosier-Lees, S., Rosmalen, R., Rosselet, Ph., van Rossum, W., Roth, S., Rubbia, A., Rubio, J. A., Rykaczewski, H., Sachwitz, M., Salicio, J., Salicio, J. M., Sanchez, E., Sanders, G. S., Santocchia, A., Sarakinos, M. S., Sartorelli, G., Sassowsky, M., Sauvage, G., Schäfer, C., Schegelsky, V., Schmitz, D., Schmitz, P., Schneegans, M., Scholz, N., Schopper, H., Schotanus, D. J., Shotkin, S., Schreiber, H. J., Shukla, J., Schulte, R., Schultze, K., Schwenke, J., Schwering, G., Sciacca, C., Scott, I., Sehgal, R., Seiler, P. G., Sens, J. C., Servoli, L., Sheer, I., Shen, D. Z., Shevchenko, S., Shi, X. R., Shumilov, E., Shoutko, V., Son, D., Sopczak, A., Soulimov, V., Spartiotis, C., Spickermann, T., Spillantini, P., Starosta, R., Steuer, M., Stickland, D. P., Sticozzi, F., Stone, H., Strauch, K., Sudhakar, K., Sultanov, G., Sun, L. Z., Susinno, G. F., Suter, H., Swain, J. D., Syed, A. A., Tang, X. W., Taylor, L., Ting, S. C. C., Ting, S. M., Toker, O., Tonutti, M., Tonwar, S. C., Tóth, J., Tsaregorodtsev, A., Tsipolitis, G., Tully, C., Tung, K. L., Tuuva, T., Ulbricht, J., Urbán, L., Uwer, U., Valente, E., Van de Walle, R. T., Vetlitsky, I., Viertel, G., Vikas, P., Vikas, U., Vivargent, M., Vogel, H., Vogt, H., Vorobiev, I., Vorobyov, A. A., Vorobyov, An. A., Vuilleumier, L., Wadhwa, M., Wallraff, W., Wang, J. C., Wang, C. R., Wang, X. L., Wang, Y. F., Wang, Z. M., Weber, A., Weber, J., Weill, R., Wenninger, J., White, M., Willmott, C., Wittgenstein, F., Wright, D., Wu, S. X., Wynhoff, S., Wyslouch, B., Xie, Y. Y., Xu, J. G., Xu, Z. Z., Xue, Z. L., Yan, D. S., Yang, B. Z., Yang, C. G., Yang, G., Ye, C. H., Ye, J. B., Ye, Q., Yeh, S. C., Yin, Z. W., You, J. M., Yunus, N., Yzerman, M., Zaccardelli, C., Zemp, P., Zeng, M., Zeng, Y., Zhang, D. H., Zhang, Z. P., Zhou, B., Zhou, G. J., Zhou, J. F., Zhu, R. Y., Zichichi, A., and van der Zwaan, B. C. C.

Abstract

We report on the measurement of the leptonic and hadronic cross sections and leptonic forward-backward asymmetries at theZ peak with the L3 detector at LEP. The total luminosity of 40.8 pb-1 collected in the years 1990, 1991 and 1992 corresponds to 1.09·106 hadronic and 0.98·105 leptonicZ decays observed. These data allow us to determine the electroweak parameters. From the cross sections we derive the properties of theZ boson: $$\begin{gathered} M_Z = 91195 \pm 9MeV\Gamma _{\rm Z} = 2494 \pm 10MeV \hfill \\ \Gamma _{had} = 1748 \pm 10MeV\Gamma _\ell = 83.49 \pm 0.46MeV \hfill \\ \end{gathered} $$ assuming lepton universality. We obtain an invisible width of Ginv=496.5±7.9 MeV which, in the Standard Model, corresponds to a number of light neutrino species ofNv=2.981±0.050.

Published
1994
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41. Search for non-minimal Higgs bosons inZ0 decays

Author

Adriani, O., Aguilar-Benitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M. G., Ambrosi, G., An, Q., Anderhub, H., Anderson, A. L., Andreev, V. P., Antonov, L., Antreasyan, D., Arce, P., Arefiev, A., Atamanchuk, A., Azemoon, T., Aziz, T., Baba, P. V. K. S., Bagnaia, P., Bakken, J. A., Baksay, L., Ball, R. C., Banerjee, S., Bao, J., Barillère, R., Barone, L., Baschirotto, A., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Behrens, J., Bencze, Gy. L., Berdugo, J., Berges, P., Bertucci, B., Betev, B. L., Biasini, M., Biland, A., Bilei, G. M., Bizzarri, R., Blaising, J. J., Bobbink, G. J., Bock, R., Böhm, A., Borgia, B., Boseti, M., Bourilkov, D., Bourquin, M., Boutigny, D., Bouwens, B., Brambilla, E., Branson, J. G., Brock, I. C., Brooks, M., Bujak, A., Burger, J. D., Burger, W. J., Busenitz, J., Cai, X. D., Capell, M., Caria, M., Carlino, G., Cartacci, A. M., Castello, R., Cerrada, M., Cesaroni, F., Chang, Y. H., Chaturvedi, U. K., Chemarin, M., Chen, A., Chen, C., Chen, G. M., Chen, H. F., Chen, H. S., Chen, M., Chen, W. Y., Chiefari, G., Chien, C. Y., Choi, M. T., Chung, S., Civinini, C., Clare, I., Clare, R., Coan, T. E., Cohn, H. O., Coignet, G., Colino, N., Contin, A., Cui, X. T., Cui, X. Y., Dai, T. S., D'Alessandro, R., de Asmundis, R., Degré, A., Deiters, K., Dénes, E., Denes, P., DeNotaristefani, F., Dhina, M., DiBitonto, D., Diemoz, M., Dimitrov, H. R., Dionisi, C., Djambazov, L., Dova, M. T., Drago, E., Driever, T., Duchesneau, D., Duinker, P., Duran, I., Easo, S., El Mamouni, H., Engler, A., Eppling, F. J., Erné, F. C., Extermann, P., Fabbretti, R., Fabre, M., Falciano, S., Fan, S. J., Fackler, O., Fay, J., Felcini, M., Ferguson, T., Fernandez, D., Fernandez, G., Ferroni, F., Fesefeldt, H., Fiandrini, E., Field, J., Filthaut, F., Ginocchiaro, G., Fisher, P. H., Forconi, G., Foreman, T., Freudenreich, K., Friebel, W., Fukushima, M., Gailloud, M., Galaktionov, Yu., Gallo, E., Ganguli, S. N., Garcia-Abia, P., Gele, D., Gentile, S., Goldfarb, S., Gong, Z. F., Gonzalez, E., Gougas, A., Goujon, D., Gratta, G., Gruenewald, M., Gu, C., Guanziroli, M., Guo, J. K., Gupta, V. K., Gurtu, A., Gustafson, H. R., Gutay, L. J., Hangarter, K., Hasan, A., Hauschildt, D., He, C. F., He, J. T., Hebbeker, T., Hebert, M., Herten, G., Hervé, A., Hilgers, K., Hofer, H., Hoorani, H., Hu, G., Hu, G. Q., Ille, B., Ilyas, M. M., Innocente, V., Janssen, H., Jezequel, S., Jin, B. N., Kasser, A., Khan, R. A., Kamyshkov, Yu., Kapinos, P., Kapustinsky, J. S., Karyotakis, Y., Kaur, M., Khokhar, S., Kienzle-Focacci, M. N., Kim, J. K., Kim, S. C., Kim, Y. G., Kinnison, W. W., Kirkby, D., Kirsch, S., Kittel, W., Klimentov, A., König, A. C., Koffeman, E., Kornadt, O., Koutsenko, V., Koulbardis, A., Kraemer, R. W., Kramer, T., Krastev, V. R., Krenz, W., Krivshich, A., Kuijten, H., Kumar, K. S., Kunin, A., Landi, G., Lanske, D., Lanzano, S., Lebrun, P., Lecomte, P., Lecoq, P., Le Coultre, P., Lee, D. M., Leedom, I., Leggett, C., Le Goff, J. M., Leiste, R., Lenti, M., Leonardi, E., Leytens, X., Li, C., Li, H. T., Li, P. J., Liao, J. Y., Lin, W. T., Lin, Z. Y., Linde, F. L., Lindemann, B., Lista, L., Liu, Y., Lohmann, W., Longo, E., Lu, Y. S., Lubbers, J. M., Lübelsmeyer, K., Luci, C., Luckey, D., Ludovici, L., Luminari, L., Lustermann, W., Ma, J. M., Ma, W. G., MacDermott, M., Malhotra, P. K., Malik, R., Malinin, A., Maña, C., Maolinbay, M., Marchesini, P., Marion, F., Marin, A., Martin, J. P., Martinez-Laso, L., Marzano, F., Massaro, G. G. G., Mazumdar, K., McBride, P., McMahon, T., McNally, D., Merk, M., Merola, L., Meschini, M., Metzger, W. J., Mi, Y., Mills, G. B., Mir, Y., Mirabelli, G., Mnich, J., Möller, M., Monteleoni, B., Morand, R., Morganti, S., Moulai, N. E., Mount, R., Müller, S., Nadtochy, A., Nagy, E., Napolitano, M., Newman, H., Neyer, C., Niaz, M. A., Nippe, A., Nowak, H., Organtini, G., Pandoulas, D., Paoletti, S., Paolucci, P., Pascala, G., Passaleva, G., Patricelli, S., Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Pei, Y. J., Pensotti, S., Perret-Gallix, D., Perrier, J., Pevsner, A., Piccolo, D., Pieri, M., Pitoué, P. A., Plasil, F., Plyaskin, V., Pohl, M., Pojidaev, V., Postema, H., Qi, Z. D., Qian, J. M., Qureshi, K. N., Raghavan, R., Rahal-Callot, G., Rancoita, P. G., Rattaggi, M., Raven, G., Razis, P., Read, K., Ren, D., Ren, Z., Rescigno, M., Reucroft, S., Ricker, A., Riemann, S., Riemers, W., Rind, O., Rizvi, H. A., Rodriguez, F. J., Röhner, M., Röhner, S., Romero, L., Rose, J., Rosier-Lees, S., Rosmalen, R., Rosselet, Ph., Rubbia, A., Rubio, J. A., Rykaczewski, H., Sachwitz, M., Sajan, E., Salicio, J., Salicio, J. M., Sanders, G. S., Santocchia, A., Sarakinos, M. S., Sartorelli, G., Sassowsky, M., Sauvage, G., Schegelsky, V., Schmitz, D., Schmitz, P., Schneegans, M., Schopper, H., Schotanus, D. J., Shotkin, S., Schreiber, H. J., Shukla, J., Schulte, R., Schulte, S., Schultze, K., Schwenke, J., Schwering, G., Sciacca, C., Scott, I., Sehgal, R., Seiler, P. G., Sens, J. C., Servoli, L., Sheer, I., Shen, D. Z., Shevchenko, S., Shi, X. R., Shumilov, E., Shoutko, V., Son, D., Sopczak, A., Spartiotis, C., Spickermann, T., Spillantini, P., Starosta, R., Steuer, M., Stickland, D. P., Sticozzi, F., Stone, H., Strauch, K., Stringfellow, B. C., Sudhakar, K., Sultanov, G., Sun, L. Z., Suter, H., Swain, J. D., Syed, A. A., Tang, X. W., Taylor, L., Terzi, G., Ting, Samuel C. C., Ting, S. M., Tonutti, M., Tonwar, S. C., Tóth, J., Tsaregorodtsev, A., Tsipolitis, G., Tully, C., Tung, K. I., Ulbricht, J., Urbán, L., Uwer, U., Valente, E., Van de Walle, R. T., Vetlitsky, I., Viertel, G., Vikas, P., Vikas, U., Vivargent, M., Vogel, H., Vogt, H., Vorobiev, I., Voroboyov, A. A., Vuilleumier, L., Wadhwa, M., Wallraff, W., Wang, C., Wang, C. R., Wang, G. H., Wang, X. L., Wang, Y. F., Wang, Z. M., Weber, A., Weber, J., Weill, R., Wenaus, T. J., Wenninger, J., White, M., Willmott, C., Wittgenstein, F., Wright, D., Wu, S. X., Wyslouch, B., Xie, Y. Y., Xu, J. G., Xu, Z. Z., Xue, Z. L., Yan, D. S., Yang, B. Z., Yang, C. G., Yang, L. G., Ye, C. H., Ye, J. B., Ye, Q., Yeh, S. C., Yin, Z. W., You, J. M., Yunus, N., Yzerman, M., Zaccardelli, C., Zemp, P., Zeng, M., Zeng, Y., Zhang, D. H., Zhang, Z. P., Zhou, B., Zhou, G. J., Zhu, R. Y., Zichichi, A., and van der Zwaan, B. C. C.

Abstract

We report on a search for the neutral and charged Higgs bosons predicted by models of spontaneous symmetry breaking with more than one Higgs doublet field. No signals are observed. We set model-independent limits on masses or branching ratios of singly and pair-produced neutral and charged Higgs bosons. In addition, we interpret our results in the framework of a general two-doublet Higgs model and the Minimal Supersymmetric extension of the Standard Model.

Published
1993
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43. The L3 silicon microvertex detector

Author

Acciarri, M., Adam, A., Adriani, O., Ahlen, S., Alcaraz, J., Ambrosi, G., Babucci, E., Baksay, L., Baschirotto, A., Battiston, R., Baur, W., Bay, A., Bencze, Gy.L., Bertucci, B., Biasini, M., Bilei, G.M., Bobbink, G.J., Boissevain, J.G., Bosetti, M., Brooks, M.L., Burger, W.J., Busenitz, J., Camps, C., Caria, M., Castellini, G., Castello, R., Checcuccl, B., Chen, A., Coan, T.E., Commichau, V., DiBitonto, D., Ding, J., Duinker, P., Djambazov, L., Easo, S., Extermann, P., Fiandrini, E., Gabbanini, A., Goldstein, J., Gougas, A., Hangarter, K., Hauviller, C., Herve, A., Hofer, M., Hofer, T., Hou, S., Josa, M.I., Kapustinsky, J.S., Kim, D., Kinnison, W.W., Kirst, H., Kornis, J., Krastev, V.R., Ladron, P., Landi, G., Lebeau, M., Lecomte, P., Lee, D.M., Leiste, R., Lejeune, E., Lin, W.T., Lohmann, W., Marin, A., Massetti, R., Mills, G.B., Nowak, H., Okle, M., Passaleva, G., Paul, T., Pauluzzi, M., Pensotti, S., Perrin, E., Produit, N., Rancoita, P.G., Rattaggi, M., Richeux, J.-P., Santocchia, A., Siedling, R., Sachwitz, M., Schmitz, P., Schöneich, B., Servoli, L., Subham, K., Susinno, G.F., Terza, G., Tesi, M., Thompson, T., Tonisch, F., Toth, J., Trowitzsch, G., Viertel, G., Tuchscherer, H., Vogt, H., Wang, S., Waldmeier, S., Weill, R., Xu, J., Yeh, S.C., Zhou, B., and Zilizi, G.

Abstract

The design and construction of the silicon strip microvertex detector (SMD) of the L3 experiment at LEP are described. We present the sensors, readout electronics, data acquisition system, mechanical assembly and support, displacement monitoring systems and radiation monitoring system of the recently installed double-sided, double-layered SMD. This detector utilizes novel and sophisticated techniques for its readout.

Published
1994
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44. Observation of multiple hard photon final states at s= 130 − 140GeV at LEP

Author

Acciarri, M., Adam, A., Adriani, O., Aguilar-Benitez, M., Ahlen, S., Alpat, B., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, A., Alverson, G., Alviggi, M.G., Ambrosi, G., Anderhub, H., Andreev, V.P., Angelescu, T., Antreasyan, D., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Baksay, L., Ball, R.C., Banerjee, S., Banicz, K., Barillère, R., Barone, L., Bartalini, P., Baschirotto, A., Basile, M., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Berdugo, J., Berges, P., Bertucci, B., Betev, B.L., Biasini, M., Biland, A., Bilei, G.M., Blaising, J.J., Blyth, S.C., Bobbink, G.J., Bock, R., Böhm, A., Borgia, B., Boucham, A., Bourilkov, D., Bourquin, M., Brambilla, E., Branson, J.G., Brigljevic, V., Brock, I.C., Buijs, A., Bujak, A., Burger, J.D., Burger, W.J., Busenitz, J., Buytenhuijs, A., Cai, X.D., Campanelli, M., Capell, M., Cara Romeo, G., Caria, M., Carlino, G., Cartacci, A.M., Casaus, J., Castellini, G., Castello, R., Cavallari, F., Cavallo, N., Cecchi, C., Cerrada, M., Cesaroni, F., Chamizo, M., Chan, A., Chang, Y.H., Chaturvedi, U.K., Chemarin, M., Chen, A., Chen, G., Chen, G.M., Chen, H.F., Chen, H.S., Chereau, X., Chiefari, G., Chien, C.Y., Choi, M.T., Cifarelli, L., Cindolo, F., Civinini, C., Clare, I., Clare, R., Cohn, H.O., Coignet, G., Colijn, A.P., Colino, N., Commichau, V., Costantini, S., Cotorobai, F., de la Cruz, B., Dai, T.S., D'Alessandro, R., de Asmundis, R., De Boeck, H., Degré, A., Deiters, K., Denes, P., DeNotaristefani, F., DiBitonto, D., Diemoz, M., van Dierendonck, D., Di Lodovico, F., Dionisi, C., Dittmar, M., Dominguez, A., Doria, A., Dorne, I., Dova, M.T., Drago, E., Duchesneau, D., Duinker, P., Duran, I., Dutta, S., Easo, S., Efremenko, Yu., El Mamouni, H., Engler, A., Eppling, F.J., Erné, F.C., Ernenwein, J.P., Extermann, P., Fabre, M., Faccini, R., Falciano, S., Favara, A., Fay, J., Felcini, M., Furetta, C., Ferguson, T., Fernandez, D., Ferroni, F., Fesefeldt, H., Fiandrini, E., Field, J.H., Filthaut, F., Fisher, P.H., Forconi, G., Fredj, L., Freudenreich, K., Galaktionov, Yu., Ganguli, S.N., Gau, S.S., Gentile, S., Gerald, J., Gheordanescu, N., Giagu, S., Goldfarb, S., Goldstein, J., Gong, Z.F., Gougas, A., Gratta, G., Gruenewald, M.W., Gupta, V.K., Gurtu, A., Gutay, L.J., Hangarter, K., Hartmann, B., Hasan, A., Hebbeker, T., Hervé, A., van Hoek, W.C., Hofer, H., Hoorani, H., Hou, S.R., Hu, G., Ilyas, M.M., Innocente, V., Janssen, H., Jin, B.N., Jones, L.W., de Jong, P., Josa-Mutuberria, I., Kasser, A., Khan, R.A., Kamyshkov, Yu., Kapinos, P., Kapustinsky, J.S., Karyotakis, Y., Kaur, M., Kienzle-Focacci, M.N., Kim, D., Kim, J.K., Kim, S.C., Kim, Y.G., Kinnison, W.W., Kirkby, A., Kirkby, D., Kirkby, J., Kittel, W., Klimentov, A., König, A.C., Köngeter, A., Korolko, I., Koutsenko, V., Koulbardis, A., Kraemer, R.W., Kramer, T., Krenz, W., Kuijten, H., Kunin, A., Ladron de Guevara, P., Landi, G., Lapoint, C., Lassila-Perini, K., Lebeau, M., Lebedev, A., Lebrun, P., Lecomte, P., Lecoq, P., Le Coultre, P., Lee, J.S., Lee, K.Y., Le Goff, J.M., Leiste, R., Lenti, M., Leonardi, E., Levtchenko, P., Li, C., Lieb, E., Lin, W.T., Linde, F.L., Lindemann, B., Lista, L., Liu, Z.A., Lohmann, W., Longo, E., Lu, W., Lu, Y.S., Lübelsmeyer, K., Luci, C., Luckey, D., Ludovici, L., Luminari, L., Lustermann, W., Ma, W.G., Macchiolo, A., Maity, M., Majumder, G., Malgeri, L., Malinin, A., Maña, C., Mangla, S., Marchesini, P., Marin, A., Martin, J.P., Marzano, F., Massaro, G.G.G., Mazumdar, K., McNally, D., McNeil, R.R., Mele, S., Merola, L., Meschini, M., Metzger, W.J., von der Mey, M., Mi, Y., Mihul, A., van Mil, A.J.W., Mirabelli, G., Mnich, J., Möller, M., Monteleoni, B., Moore, R., Morganti, S., Mount, R., Müller, S., Muheim, F., Nagy, E., Nahn, S., Napolitano, M., Nessi-Tedaldi, F., Newman, H., Nippe, A., Nowak, H., Organtini, G., Ostonen, R., Pandoulas, D., Paoletti, S., Paolucci, P., Park, H.K., Pascale, G., Passaleva, G., Patricelli, S., Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Peach, D., Pei, Y.J., Pensotti, S., Perret-Gallix, D., Petrak, S., Pevsner, A., Piccolo, D., Pieri, M., Pinto, J.C., Piroué, P.A., Pistolesi, E., Plyaskin, V., Pohl, M., Pojidaev, V., Postema, H., Produit, N., Raghavan, R., Rahal-Callot, G., Rancoita, P.G., Rattaggi, M., Raven, G., Razis, P., Read, K., Ren, D., Rescigno, M., Reucroft, S., van Rhee, T., Ricker, A., Riemann, S., Riemers, B.C., Riles, K., Ro, S., Robohm, A., Rodin, J., Rodriguez, F.J., Roe, B.P., Röhner, S., Romero, L., Rosier-Lees, S., Rosselet, Ph., van Rossum, W., Roth, S., Rubio, J.A., Rykaczewski, H., Salicio, J., Sanchez, E., Santocchia, A., Sarakinos, M.E., Sarkar, S., Sassowsky, M., Schäfer, C., Schegelsky, V., Schmidt-Kaerst, S., Schmitz, D., Schmitz, P., Schneegans, M., Schoeneich, B., Scholz, N., Schopper, H., Schotanus, D.J., Schulte, R., Schultze, K., Schwenke, J., Schwering, G., Sciacca, C., Sciarrino, D., Sens, J.C., Servoli, L., Shevchenko, S., Shivarov, N., Shoutko, V., Shukla, J., Shumilov, E., Siedenburg, T., Son, D., Sopczak, A., Smith, B., Spillantini, P., Steuer, M., Stickland, D.P., Sticozzi, F., Stone, H., Stoyanov, B., Straessner, A., Strauch, K., Sudhakar, K., Sultanov, G., Sun, L.Z., Susinno, G.F., Suter, H., Swain, J.D., Tang, X.W., Tauscher, L., Taylor, L., Ting, Samuel C.C., Ting, S.M., Toker, O., Tonisch, F., Tonutti, M., Tonwar, S.C., Tóth, J., Tsaregorodtsev, A., Tully, C., Tuchscherer, H., Tung, K.L., Ulbricht, J., Uwer, U., Valente, E., Van de Walle, R.T., Vetlitsky, I., Viertel, G., Vivargent, M., Völkert, R., Vogel, H., Vogt, H., Vorobiev, I., Vorobyov, A.A., Vorobyov, An.A., Vorvolakos, A., Wadhwa, M., Wallraff, W., Wang, J.C., Wang, X.L., Wang, Y.F., Wang, Z.M., Weber, A., Wittgenstein, F., Wu, S.X., Wynhoff, S., Xu, J., Xu, Z.Z., Yang, B.Z., Yang, C.G., Yao, X.Y., Ye, J.B., Yeh, S.C., You, J.M., Zaccardelli, C., Zalite, An., Zemp, P., Zeng, Y., Zhang, Z., Zhang, Z.P., Zhou, B., Zhou, Y., Zhu, G.Y., Zhu, R.Y., and Zichichi, A.

Abstract

We have studied the process e+e−→ nγ(n≥ 2) at an average center-of-mass energy of 133 GeV using the L3 detector at LEP. For an integrated luminosity of 4.95 pb−1we find one γγγγ(γ) final state with only hard photons. The rates of both γγγ and γγ events are consistent with QED expectations. The cross section of the reaction e+e−→ γγ(γ) in the polar range 16° < θγ< 164° is measured to be 22.6 ± 2.2 pb. Decays into photons of narrow scalar resonances with masses between 90 and 130 GeV are not observed. The observation of the event with four energetic photons is consistent with QED although the kinematic configuration of the photons is atypical.

Published
1996
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45. Search for lepton flavour violation in Z decays

Author

Adriani, O., Aguilar-Benitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M.G., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Angelescu, T., Antonov, L., Antreasyan, D., Arce, P., Arefiev, A., Atamanchuk, A., Azemoon, T., Aziz, T., Baba, P.V.K.S., Bagnaia, P., Bakken, J.A., Ball, R.C., Banerjee, S., Bao, J., Barillère, R., Barone, L., Baschirotto, A., Battiston, R., Bay, A., Becattini, F., Bechtluft, J., Becker, R., Becker, U., Behner, F., Behrens, J., Bencze, Gy.L., Berdugo, J., Berges, P., Bertucci, B., Betev, B.L., Biasini, M., Biland, A., Bilei, G.M., Bizzarri, R., Blaising, J.J., Bobbink, G.J., Bock, R., Böhm, A., Borgia, B., Bosetti, M., Bourilkov, D., Bourquin, M., Boutigny, D., Bouwens, B., Brambilla, E., Branson, J.G., Brock, I.C., Brooks, M., Bujak, A., Burger, J.D., Burger, W.J., Busenitz, J., Buytenhuijs, A., Cai, X.D., Capell, M., Caria, M., Carlino, G., Cartacci, A.M., Castello, R., Cerrada, M., Cesaroni, F., Chang, Y.H., Chaturvedi, U.K., Chemarin, M., Chen, A., Chen, C., Chen, G., Chen, G.M., Chen, H.F., Chen, H.S., Chen, M., Chen, W.Y., Chiefari, G.V., Chien, C.Y., Choi, M.T., Chung, S., Civinini, C., Clare, I., Clare, R., Coan, T.E., Cohn, H.O., Coignet, G., Colino, N., Contin, A., Cotorobai, F., Cui, X.T., Cui, X.Y., Dai, T.S., D'Alessandro, R., de Asmundis, R., Degré, A., Deiters, K., Dénes, E., Denes, P., DeNotaristefani, F., Dhina, M., DiBitonto, D., Diemoz, M., Dimitrov, H.R., Dionisi, C., Dittmar, M., Djambazov, L., Dova, M.T., Drago, E., Duchesneau, D., Duinker, P., Duran, I., Easo, S., El Mamouni, H., Engler, A., Eppling, F.J., Erné, F.C., Extermann, P., Fabbretti, R., Fabre, M., Falciano, S., Fan, S.J., Fackler, O., Fay, J., Felcini, M., Ferguson, T., Fernandez, D., Fernandez, G., Ferroni, F., Fesefeldt, H., Fiandrini, E., Field, J.H., Filthaut, F., Fisher, P.H., Forconi, G., Fredj, L., Freudenreich, K., Friebel, W., Fukushima, M., Gailloud, M., Galaktionov, Yu., Gallo, E., Ganguli, S.N., Garcia-Abia, P., Gele, D., Gentile, S., Gheordanescu, N., Giagu, S., Goldfarb, S., Gong, Z.F., Gonzalez, E., Gougas, A., Goujon, D., Gratta, G., Gruenewald, M., Gu, C., Guanziroli, M., Guo, J.K., Gupta, V.K., Gurtu, A., Gustafson, H.R., Gutay, L.J., Hangarter, K., Hartmann, B., Hasan, A., Hauschildt, D., He, C.F., He, J.T., Hebbeker, T., Hebert, M., Hervé, A., Hilgers, K., Hofer, H., Hoorani, H., Hu, G., Hu, G.Q., Ille, B., Ilyas, M.M., Innocente, V., Janssen, H., Jezequel, S., Jin, B.N., Jones, L.W., Josa-Mutuberria, I., Kasser, A., Khan, R.A., Kamyshkov, Yu., Kapinos, P., Kapustinsky, J.S., Karyotakis, Y., Kaur, M., Khokhar, S., Kienzle-Focacci, M.N., Kim, J.K., Kim, S.C., Kim, Y.G., Kinnison, W.W., Kirkby, A., Kirkby, D., Kirsch, S., Kittel, W., Klimentov, A., Klöckner, R., König, A.C., Koffeman, E., Kornadt, O., Koutsenko, V., Koulbardis, A., Kraemer, R.W., Kramer, T., Krastev, V.R., Krenz, W., Krivshich, A., Kuijten, H., Kumar, K.S., Kunin, A., Landi, G., Lanske, D., Lanzano, S., Lebedev, A., Lebrun, P., Lecomte, P., Lecoq, P., Le Coultre, P., Lee, D.M., Lee, J.S., Lee, K.Y., Leedom, I., Leggett, C., Le Goff, J.M., Leiste, R., Lenti, M., Leonardi, E., Li, C., Li, H.T., Li, P.J., Liao, J.Y., Lin, W.T., Lin, Z.Y., Linde, F.L., Lindemann, B., Liu, Y., Liu, Y., Lohmann, W., Longo, E., Lu, Y.S., Lubbers, J.M., Lübelsmeyer, K., Luci, C., Luckey, D., Ludovici, L., Luminari, L., Lustermann, W., Ma, J.M., Ma, W.G., MacDermott, M., Malik, R., Malinin, A., Maña, C., Maolinbay, M., Marchesini, P., Marion, F., Marin, A., Martin, J.P., Martinez-Laso, L., Marzano, F., Massaro, G.G.G., Mazumdar, K., McBride, P., McMahon, T., McNally, D., Merk, M., Merola, L., Meschini, M., Metzger, W.J., Mi, Y., Mihul, A., Mills, G.B., Mir, Y., Mirabelli, G., Mnich, J., Möller, M., Monteleoni, B., Morand, R., Morganti, S., Moulai, N.E., Mount, R., Müller, S., Nadtochy, A., Nagy, E., Napolitano, M., Nessi-Tedaldi, F., Newman, H., Neyer, C., Niaz, M.A., Nippe, A., Nowak, H., Organtini, G., Pandoulas, D., Paoletti, S., Paolucci, P., Pascale, G., Passaleva, G., Patricelli, S., Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Pei, Y.J., Pensotti, S., Perret-Galliz, D., Perrier, J., Pevsner, A., Piccolo, D., Pieri, M., Piroué, P.A., Plasil, F., Plyaskin, V., Pohl, M., Pojidaev, V., Postema, H., Qi, Z.D., Qian, J.M., Qureshi, K.N., Raghavan, R., Rahal-Callot, G., Rancoita, P.G., Rattaggi, M., Raven, G., Razis, P., Read, K., Ren, D., Ren, Z., Rescigno, M., Reucroft, S., Ricker, A., Riemann, S., Riemers, B.C., Riles, K., Rind, O., Rizvi, H.A., Ro, S., Rodriguez, F.J., Roe, B.P., Röhner, M., Romero, L., Rosier-Lees, S., Rosmalen, R., Rosselet, Ph., van Rossum, W., Roth, S., Rubbia, A., Rubio, J.A., Rykaczewski, H., Sachwitz, M., Salico, J., Salicio, J.M., Sanders, G.S., Santocchia, A., Sarakinos, M.S., Sartorelli, G., Sassowsky, M., Sauvage, G., Schegelsky, V., Schmitz, D., Schmitz, P., Schneegans, M., Schopper, H., Schotanus, D.J., Shotkin, S., Schreiber, H.J., Shukla, J., Schulte, R., Schulte, S., Schultze, K., Schwenke, J., Schwering, G., Sciacca, C., Scott, I., Sehgal, R., Seiler, P.G., Sens, J.C., Servoli, L., Sheer, I., Shen, D.Z., Shevchenko, S., Shi, X.R., Shumilov, E., Shoutko, V., Son, D., Sopczak, A., Soulimov, V., Spartiotis, C., Spickermann, T., Spillantini, P., Starosta, R., Steuer, M., Stickland, D.P., Sticozzi, F., Stone, H., Strauch, K., Stringfellow, B.C., Sudhakar, K., Sultanov, G., Sun, L.Z., Susinno, G.F., Suter, H., Swain, J.D., Syed, A.A., Tang, X.W., Taylor, L., Terzi, G., C.C. Ting, Samuel, Ting, S.M., Tonutti, M., Tonwar, S.C., Tóth, J., Tsaregorodtsev, A., Tsipolitis, G., Tully, C., Tung, K.L., Ulbricht, J., Urbán, L., Uwer, U., Valente, E., Van de Walle, R.T., Vetlitsky, I., Viertel, G., Vikas, P., Vikas, U., Vivargent, M., Vogel, H., Vogt, H., Vorobiev, I., Vorobyov, A.A., Vuilleumier, L., Wadhwa, M., Wallraff, W., Wang, C., Wang, C.R., Wang, X.L., Wang, Y.F., Wang, Z.M., Warner, C., Weber, A., Weber, J., Weill, R., Wenaus, T.J., Wenninger, J., White, M., Willmott, C., Wittgenstein, F., Wright, D., Wu, S.X., Wynhoff, S., Wysłouch, B., Xie, Y.Y., Xu, J.G., Xu, Z.Z., Xue, Z.L., Yan, D.S., Yang, B.Z., Yang, C.G., Yang, G., Ye, C.H., Ye, J.B., Ye, Q., Yeh, S.C., Yin, Z.W., You, J.M., Yunus, N., Yzerman, M., Zaccardelli, C., Zaitsev, N., Zemp, P., Zeng, M., Zeng, Y., Zhang, D.H., Zhang, Z.P., Zhou, B., Zhou, G.J., Zhou, J.F., Zhu, R.Y., Zichichi, A., and van der Zwaan, B.C.C.

Abstract

We have searched for lepton flavour violation in Zboson decays into lepton pairs using all data collected with the L3 detector during the 1990, 1991 and 1992 runs on an event sample corresponding to 1 500 000 Z's produced. At the 95% confidence level the upper limits on the branching ratio for Z→eμ is 0.6×10−5and for Z→μτ this is 1.9×10−5.

Published
1993
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46. Test system for an optical readout chain of a silicon microstrip detector

Author

Acciarri, M, Arcesi, B, Baschirotto, A, Castello, R, Furetta, C, Pensotti, S, Rancoita, P.G, Rattaggi, M, Redaelli, M, and Seidman, A

Abstract

A test system, for an optical readout chain of a double-sided silicon microstrip detector, is presented. The system can be used for a quick but complete test of the working performance of the optical readout chain, and for finding exactly the faulty part of the readout chain, in case that an error is detected. It was designed, developed, and built for a silicon microvertex detector used at the LEP collider. A description, of both the hardwave and software of the system, is given. Finally, experimental results, of laboratory tests, are shown.

Published
1996
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48. Measurement of the branching ratiosb→e ν X, μ ν X, τ ν Xandν X

Author

Acciarri, M., Adam, A., Adriani, O., Aguilar-Benitez, M., Ahlen, S., Alpat, B., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, A., Alverson, G., Alviggi, M. G., Ambrosi, G., Anderhub, H., Andreev, V. P., Angelescu, T., Antreasyan, D., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Baksay, L., Ball, R. C., Banerjee, S., Banicz, K., Barillère, R., Barone, L., Bartalini, P., Baschirotto, A., Basile, M., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Berdugo, J., Berges, P., Bertucci, B., Betev, B. L., Biasini, M., Biland, A., Bilei, G. M., Blaising, J. J., Blyth, S. C., Bobbink, G. J., Bock, R., Böhm, A., Borgia, B., Boucham, A., Bourilkov, D., Bourquin, M., Boutigny, D., Brambilla, E., Branson, J. G., Brigljevic, V., Brock, I. C., Buijs, A., Bujak, A., Burger, J. D., Burger, W. J., Busenitz, J., Buytenhuijs, A., Cai, X. D., Campanelli, M., Capell, M., Romeo, G. Cara, Caria, M., Carlino, G., Cartacci, A. M., Casaus, J., Castellini, G., Castello, R., Cavallari, F., Cavallo, N., Cecchi, C., Cerrada, M., Cesaroni, F., Chamizo, M., Chan, A., Chang, Y. H., Chaturvedi, U. K., Chemarin, M., Chen, A., Chen, G., Chen, G. M., Chen, H. F., Chen, H. S., Chen, M., Chiefari, G., Chien, C. Y., Choi, M. T., Cifarelli, L., Cindolo, F., Civinini, C., Clare, I., Clare, R., Cohn, H. O., Coignet, G., Colijn, A. P., Colino, N., Costantini, S., Cotorobai, F., de al Cruz, B., Csilling, A., Dai, T. S., D’Alessandro, R., de Asmundis, R., De Boeck, H., Degré, A., Deiters, K., Denes, P., DeNotaristefani, F., DiBitonto, D., Diemoz, M., van Dierendonck, D., Di Lodovico, F., Dionisi, C., Dittmar, M., Dominguez, A., Doria, A., Dorne, I., Dova, M. T., Drago, E., Duchesneau, D., Duinker, P., Duran, I., Dutta, S., Easo, S., Efremenko, Yu., El Mamouni, H., Engler, A., Eppling, F. J., Erné, F. C., Ernenwein, J. P., Extermann, P., Fabre, M., Faccini, R., Falciano, S., Favara, A., Fay, J., Felcini, M., Furetta, C., Ferguson, T., Fernandez, D., Ferroni, F., Fesefeldt, H., Fiandrini, E., Field, J. H., Filthaut, F., Fisher, P. H., Forconi, G., Fredj, L., Freudenreich, K., Galaktionov, Yu., Ganguli, S. N., Gau, S. S., Gentile, S., Gerald, J., Gheordanescu, N., Giagu, S., Goldfarb, S., Goldstein, J., Gong, Z. F., Gougas, A., Gratta, G., Gruenewald, M. W., Gupta, V. K., Gurtu, A., Gutay, L. J., Hangarter, K., Hartmann, B., Hasan, A., Hebbeker, T., Hervé, A., van Hoek, W. C., Hofer, H., Hoorani, H., Hou, S. R., Hu, G., Ilyas, M. M., Innocente, V., Janssen, H., Jin, B. N., Jones, L. W., de Jong, P., Josa-Mutuberria, I., Kasser, A., Khan, R. A., Kamyshkov, Yu., Kapinos, P., Kapustinsky, J. S., Karyotakis, Y., Kaur, M., Kienzle-Focacci, M. N., Kim, D., Kim, J. K., Kim, S. C., Kim, Y. G., Kinnison, W. W., Kirkby, A., Kirkby, D., Kirkby, J., Kiss, D., Kittel, W., Klimentov, A., König, A. C., Korolko, I., Koutsenko, V., Koulbardis, A., Kraemer, R. W., Kramer, T., Krenz, W., Kuijten, H., Kunin, A., Ladron de Guevara, P., Landi, G., Lapoint, C., Lassila-Perini, K., Laurikainen, P., Lebeau, M., Lebedev, A., Lebrun, P., Lecomte, P., Lecoq, P., Le Coultre, P., Lee, J. S., Lee, K. Y., Leggett, C., Le Goff, J. M., Leiste, R., Lenti, M., Leonardi, E., Levtchenko, P., Li, C., Lieb, E., Lin, W. T., Linde, F. L., Lista, L., Liu, Z. A., Lohmann, W., Longo, E., Lu, W., Lu, Y. S., Lübelsmeyer, K., Luci, C., Luckey, D., Ludovici, L., Luminari, L., Lustermann, W., Ma, W. G., Macchiolo, A., Maity, M., Majumder, G., Malgeri, L., Malinin, A., Maña, C., Mangla, S., Marchesini, P., Marin, A., Martin, J. P., Marzano, F., Massaro, G. G. G., Mazumdar, K., McNally, D., Mele, S., Merola, L., Meschini, M., Metzger, W. J., von der Mey, M., Mi, Y., Mihul, A., van Mil, A. J. W., Mirabelli, G., Mnich, J., Monteleoni, B., Moore, R., Morganti, S., Mount, R., Müller, S., Muheim, F., Nagy, E., Nahn, S., Napolitano, M., Nessi-Tedaldi, F., Newman, H., Nippe, A., Nowak, H., Organtini, G., Ostonen, R., Pandoulas, D., Paoletti, S., Paolucci, P., Park, H. K., Pascale, G., Passaleva, G., Patricelli, S., Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Peach, D., Pei, Y. J., Pensotti, S., Perret-Gallix, D., Petrak, S., Pevsner, A., Piccolo, D., Pieri, M., Pinto, J. C., Piroué, P. A., Pistolesi, E., Plyaskin, V., Pohl, M., Pojidaev, V., Postema, H., Produit, N., Raghavan, R., Rahal-Callot, G., Rancoita, P. G., Rattaggi, M., Raven, G., Razis, P., Read, K., Ren, D., Rescigno, M., Reucroft, S., van Rhee, T., Riemann, S., Riemers, B. C., Riles, K., Rind, O., Ro, S., Robohm, A., Rodin, J., Rodriguez, F. J., Roe, B. P., Röhner, S., Romero, L., Rosier-Lees, S., Rosselet, Ph., van Rossum, W., Roth, S., Rubio, J. A., Rykaczewski, H., Salicio, J., Sanchez, E., Santocchia, A., Sarakinos, M. E., Sarkar, S., Sassowsky, M., Sauvage, G., Schneegans, M., Schoeneich, B., Scholz, N., Schopper, H., Schotanus, D. J., Schwenke, J., Schwering, G., Sciacca, C., Sciarrino, D., Sens, J. C., Servoli, L., Shevchenko, S., Shivarov, N., Shoutko, V., Shukla, J., Shumilov, E., Siedenburg, T., Son, D., Sopczak, A., Soulimov, V., Smith, B., Spillantini, P., Steuer, M., Stickland, D. P., Sticozzi, F., Stone, H., Stoyanov, B., Straessner, A., Strauch, K., Sudhakar, K., Sultanov, G., Sun, L. Z., Susinno, G. F., Suter, H., Swain, J. D., Tang, X. W., Tauscher, L., Taylor, L., Ting, Samuel C. C., Ting, S. M., Tonisch, F., Tonutti, M., Tonwar, S. C., Tóth, J., Tsaregorodtsev, A., Tully, C., Tuchscherer, H., Tung, K. L., Ulbricht, J., Uwer, U., Valente, E., Van de Walle, R. T., Vesztergombi, G., Vetlitsky, I., Viertel, G., Vivargent, M., Völkert, R., Vogel, H., Vogt, H., Vorobiev, I., Vorobyov, A. A., Vorobyov, An. A., Vorvolakos, A., Wadhwa, M., Wallraff, W., Wang, J. C., Wang, X. L., Wang, Y. F., Wang, Z. M., Weber, A., Wittgenstein, F., Wu, S. X., Wynhoff, S., Xu, J., Xu, Z. Z., Yang, B. Z., Yang, C. G., Yao, X. Y., Ye, J. B., Yeh, S. C., You, J. M., Zaccardelli, C., Zalite, An., Zemp, P., Zeng, Y., Zhang, Z., Zhang, Z. P., Zhou, B., Zhou, Y., Zhu, G. Y., Zhu, R. Y., and Zichichi, A.

Abstract

The inclusive semileptonic branching ratios b→eνX,μ νX,τ νX andνX have been measured at LEP with the L3 detector. The analysis is based on 2-jet hadronic Z decays obtained in the data collected between 1991 and 1992. Three separate event samples are analysed, containing electrons, muons and large missing energy (neutrinos), respectively. From the electron sample, we measure Br(b→eνX)=(10.89±0.20±0.51)% and, from the muon sample, Br(b→μ νX)=(10.82±0.15±0.59)%, where the first error is statistical and the second is systematic. From the missing energy sample, we measure Br(b→νX)=(23.08±0.77±1.24)%, assuming the relative semileptonic decay rates e:μ:τ=1:1:(0.25±0.05), according to theoretical expectations. From a combined analysis of all three samples and constraining the relative semileptonic rates, we measure Br(b→eνX)=Br(b→μ νX)=(10.68±0.11±0.46)%. Alternatively, we can remove the constraint on the relative semileptonic rates and measure Br(b→τ νX)=(1.7±0.5±1.1)%.

Published
1996
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49. The L3 Silicon Microvertex Detector: installation and results on 1993 performance

Author

Acciarri, M., Adam, A., Adriani, O., Ahlen, S., Alcaraz, J., Ambrosi, G., Andersson, H., Andreev, V.P., Babucci, E., Baksay, L., Baschirotto, A., Battiston, R., Bay, A., Bencze, Gv.L., Bertucci, B., Biasini, M., Bilei, G.M., Bobbink, G.J., Bosetti, M., Brigljevic, V., Brooks, M.L., Burger, W.J., Busenitz, J., Camps, C., Caria, M., Castellini, G., Checcucci, B., Chen, A., Choumilov, E., Choutko, V., Coan, T.E., Cotorobai, F., Commichau, V., DiBitonto, D., Ding, D., Duinker, P., Easo, S., Extermann, P., Fiandrini, E., Gabbanini, A., Goldstein, J., Gougas, A., Hangarter, K., Hauviller, C., Hervé, A., Hofer, H., Hou, S.R., Josa-Mutuberria, I., Kapustinsky, J.S., Kim, D., Kinnison, W.W., Kornis, J., Krastev, V.R., ladron de Guevara, P., Landi, G., Lebeau, M., Lee, D.M., Levtchenko, P., Leiste, R., Lejeune, E., Lin, W.T., Lohmann, W., Marin, A., Mills, G.B., Nowak, H., Passaleva, G., Paul, T., Pauluzzi, M., Pensotti, S., Perrin, E., Pinto, J.C., Pohl, M., Produit, N., Rancoita, P.G., Rattaggi, M., Richeux, J.P., Santocchia, A., Schmitz, P., Schöneich, B., Servoli, L., Shevchenko, S., Sopczak, A., Terzi, G., Tonisch, F., Toth, J., Trowitzsch, G., Tuchscherer, H., Van Hoek, M., Vogt, H., Weill, R., Xu, J., Yeh, S.C., Zhou, B., and Zilizi, G.

Abstract

The status of the Silicon Microvertex Detector (SMD) and its installation into the LEP-L3 experiment are presented, highlighting novel features and sophisticated techniques. Preliminary results based on 1993 data are given and compared with Monte Carlo predictions, to understand the detector performances and its tracking capabilities.

Published
1995
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50. The readout and DAQ system of the L3 silicon microstrip detector

Author

Ambrosi, G., Acciarri, M., Adriani, O., Baschirotto, A., Battiston, R., Bay, A., Bertucci, B., Bilei, G.M., Bosetti, M., Brooks, M.L., Burger, W.J., Camps, C., Castellini, G., Castello, R., Checcucci, B., Coan, T.E., Commichau, V., Extermann, P., Gabbanini, A., Hangarter, K., Kapustinsky, J.S., Kinnison, W.W., Landi, G., Lee, D.M., Leiste, R., Lohmann, W., Mills, G.B., Nowak, H., Passaleva, G., Pensotti, S., Rancoita, P.G., Rattaggi, M., Siedling, R., Sachwitz, M., Schmitz, P., Schöneich, B., Terzi, G., Tesi, M., Tonisch, F., Trowitzsch, G., and Vogt, H.

Abstract

In 1993 the L3 detector at LEP has been equipped with a Silicon Microstrip Detector (SMD). In this paper we give a full description of the various components of the SMD readout and DAQ system.

Published
1995
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