Measurement of the Higgs mass via the channel : e+e- -> ZH -> e+e- + X

In this communication, the mass declined for the decay channel, e+e- -> ZH -> e+e- + X, as measured by the ILD detector was studied. The Higgs mass is assumed to be 120 GeV and the center of mass energy is 250 GeV. For an integrated luminosity of 250 fb-1, the accuracy of the reconstruction and the good knowledge of the initial state allow for the measurement of the Higgs boson mass with a precision of about 100 MeV.Comment: 7 pages, 14 figures, LCWS/ILC 2010 (International Linear Collider Workshop 2010 LCWS10 and ILC10

Study of the energy resolution in the electromagnetic end-caps of the future LDC detector for the ILC

The electromagnetic end-caps of the future LDC detector for the ILC ("International Linear Collider") have been simulated with the MOKKA software. The goal of this study is to determine the energy resolution with the classical method, i.e. the energy deposited in 30 + 10 active silicon layers, preceded by 1.4 and 4.2 mm of tungsten placed perpendicularly to the beam axis, respectively. The energy resolution has been fitted by the function $\Delta E/E = a/\sqrt {E} c$ and it was found that a = 12.69 +- 0.17 % GeV$^{1/2}$ and c = 0.839 +- 0.026 % for incident electrons at $\theta$=21.80 degrees and a = 13.33 +- 0.24 % GeV$^{1/2}$ and c = 0.968 +- 0.050 % for incident photons with the same polar angle

A Digitally Calibrated 12 bits 25 MS/s Pipelined ADC with a 3 input multiplexer for CALICE Integrated Readout

The necessity of full integrated electronics readout for the next ILC ECAL presents many challenges for low power mixed signal design. The analog to digital converter is a critical stage for the system going from the very front-end stages to digital memories. We present here a high speed converter configuration designed to multiplex 3 analog channels through one analog to digital converter. It is a first step for a multiplexed 64 channel design. A CMOS 0.35μm process is used. The dynamic range is 2V over a 3.3V power supply, and the total power dissipation at 25 MHz is approximately 40mW. An analog power management is included to allow a fast switching into a standby mode that reduces the DC power dissipation by a ratio of three orders of magnitude (1/1000)

A low power and low signal 4 bit 50MS/s double sampling pipelined ADC for monolithie active pixel sensors

A 4 bit very low power and low incoming signal analog to digital converter (ADC) using a double sampling switched capacitor technique, designed for use in CMOS monolithic active pixels sensor readout, has been implemented in 0.35μm CMOS technology. A non-resetting sample and hold stage is integrated to amplify the incoming signal by 4. This first stage compensates both the amplifier offset effect and the input common mode voltage fluctuations. The converter is composed of a 2.5 bit pipeline stage followed by a 2 bit flash stage. This prototype consists of 4 ADC double-channels; each one is sampling at 50MS/s and dissipates only 2.6mW at 3.3V supply voltage. A bias pulsing stage is integrated in the circuit. Therefore, the analog part is switched OFF or ON in less than 1μs. The size for the layout is 80μm*0.9mm. This corresponds to the pitch of 4 pixel columns, each one is 20μm wide

Design of High Dynamic Range Digital to Analog Converters for the Calibration of the CALICE Si-W Ecal readout electronics

The ILC ECAL front-end chip will integrate many functions of the readout electronics including a DAC dedicated to calibration. We present two versions of DAC with respectively 12 and 14 bits, designed in a CMOS 0.35μm process. Both are based on segmented arrays of switched capacitors controlled by a Dynamic Element Matching (DEM) algorithm. A full differential architecture is used, and the amplifiers can be turned into a standby mode reducing the power dissipation. The 12 bit DAC features an INL lower than 0.3 LSB at 5MHz, and dissipates less than 7mW. The 14 bit DAC is an improved version of the 12 bit design

Fluorination influences the bioisostery of myo-inositol pyrophosphate analogs

Inositol pyrophosphates (PP-IPs) are densely phosphorylated messenger molecules involved in numerous biological processes. PP-IPs contain one or two pyrophosphate group(s) attached to a phosphorylated myo-inositol ring. 5PP-IP5 is the most abundant PP-IP in human cells. To investigate the function and regulation by PP-IPs in biological contexts, metabolically stable analogs have been developed. Here, we report the synthesis of a new fluorinated phosphoramidite reagent and its application for the synthesis of a difluoromethylene bisphosphonate analog of 5PP-IP5. Subsequently, the properties of all currently reported analogs were benchmarked using a number of biophysical and biochemical methods, including co-crystallization, ITC, kinase activity assays and chromatography. Together, the results showcase how small structural alterations of the analogs can have notable effects on their properties in a biochemical setting and will guide in the choice of the most suitable analog(s) for future investigations

A very low power and low signal 5 bit 50 M samples/s double sampling pipelined ADC for Monolithic Active Pixel Sensors in high energy physics and biomedical imaging applications

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