H. F-W. Sadrozinski
A5077298972- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Dark Matter and Cosmic Phenomena
- Radiation Detection and Scintillator Technologies
- Astrophysics and Cosmic Phenomena
- Computational Physics and Python Applications
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- CCD and CMOS Imaging Sensors
- Radiation Effects in Electronics
- Radiation Therapy and Dosimetry
- Nuclear Physics and Applications
- Medical Imaging Techniques and Applications
- Pulsars and Gravitational Waves Research
- Black Holes and Theoretical Physics
- Radio Astronomy Observations and Technology
- Particle Accelerators and Free-Electron Lasers
- Atomic and Subatomic Physics Research
- Astrophysical Phenomena and Observations
- Distributed and Parallel Computing Systems
- Advancements in Semiconductor Devices and Circuit Design
- Silicon and Solar Cell Technologies
University of California, Santa Cruz
2016-2025
The University of Adelaide
2014-2023
European Organization for Nuclear Research
2010-2023
Sapienza University of Rome
2023
Institute of Particle Physics
2022
Centre de Calcul de l’Institut National de Physique Nucléaire et de Physique des Particules
2020
Beijing Normal University
2020
Beijing Haidian Hospital
2020
University of Manchester
2019
Centro Nacional de Microelectrónica
2014-2018
The evolution of particle detectors has always pushed the technological limit in order to provide enabling technologies researchers all fields science. One archetypal example is silicon detectors, from a system with few channels 30 years ago, tens millions independent pixels currently used track charged particles major physics experiments. Nowadays, are ubiquitous not only research laboratories but almost every high-tech apparatus, portable phones hospitals. In this contribution, we present...
We report a revised determination of charmed-D-meson absolute branching fractions based on complete reconstruction DD¯ events at the ψ(3770). Two backgrounds, Cabibbo-suppressed and multi-π0 D decays, are addressed in detail. The first measurement decay D0→K−π+π0π0 establishes sensitivity to hitherto unobserved modes. Removal both backgrounds reduces values our previously reported by (21-24)%, leaving their ratios largely unchanged. new unable account fully for deficit charm production...
Proton computed tomography (pCT) has the potential to improve accuracy of dose calculations for proton treatment planning, and will also be useful pretreatment verification patient positioning relative beam. A design study was performed define optimal approach a pCT system based on specifications applications in therapy. Conceptual detailed is presented; consists silicon-based particle tracking crystal calorimeter measure energy loss individual protons. We discuss formation images...
In this paper we report on the timing resolution of first production 50 micro-meter thick Ultra-Fast Silicon Detectors (UFSD) as obtained in a beam test with pions 180 GeV/c momentum. UFSD are based Low-Gain Avalanche (LGAD) design, employing n-on-p silicon sensors internal charge multiplication due to presence thin, low-resistivity diffusion layer below junction. The used belongs thin (50 μm) sensors, an pad area 1.4 mm2. gain was measured vary between 5 and 70 depending bias voltage....
A new technique is applied to data collected at the $\ensuremath{\psi}(3770)$ resonance derive charmed-$D$-meson branching fractions without relying on measurement of $D$-production cross sections. Measurements are presented for three decay modes ${D}^{0} ({K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}, {D}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}, \mathrm{and} {K}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}$ and four...
Novel silicon detectors with charge gain were designed (Low Gain Avalanche Detectors - LGAD) to be used in particle physics experiments, medical and timing applications. They are based on a n++-p+-p structure where appropriate doping of multiplication layer (p^+) is needed achieve high fields impact ionization. Several wafers processed different junction parameters resulting gains up 16 at voltages. In order study radiation hardness LGAD, which one key requirements for future energy several...
The Crystal Ball detector at SPEAR has been used to investigate the decays ψ′→γγJψ, Jψ→(e+e− or μ+μ−) resulting from production of 8×105ψ′. From this selection data we measure branching ratios for processes ψ′→(η π0)Jψ and ψ′→γχ, χ→γJψ. An analysis angular correlations in latter process furnishes measurements χ(3.55) χ(3.51) spins multipole structure radiative transitions.Received 9 December 1981DOI:https://doi.org/10.1103/PhysRevD.25.2259©1982 American Physical Society
Evidence for a new resonance $\ensuremath{\theta}\ensuremath{\rightarrow}\ensuremath{\eta}\ensuremath{\eta}$ in the process $\frac{J}{\ensuremath{\psi}}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\eta}\ensuremath{\eta}$ is presented. The parameters of $\ensuremath{\theta}$ are $M=1640\ifmmode\pm\else\textpm\fi{}50$ MeV and $\ensuremath{\Gamma}={220}_{\ensuremath{-}70}^{+100}$ MeV. ${J}^{\mathrm{PC}}={2}^{++}$ preferred over ${0}^{++}$.
Evidence is presented for a narrow state, called \ensuremath{\xi}, in the decay modes J/\ensuremath{\psi}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\xi}, \ensuremath{\xi}\ensuremath{\rightarrow}${K}^{+}$${K}^{\mathrm{\ensuremath{-}}}$, and \ensuremath{\xi}\ensuremath{\rightarrow}${K}_{S}^{0}$${K}_{S}^{0}$. In ${K}^{+}$${K}^{\mathrm{\ensuremath{-}}}$ mode, \ensuremath{\xi} has mass of 2.230\ifmmode\pm\else\textpm\fi{}0.006\ifmmode\pm\else\textpm\fi{}0.014 GeV/${c}^{2}$, width...
Measurements of the semileptonic branching ratios charmed ${D}^{+}$ and ${D}^{0}$ mesons are presented, from data collected at $\ensuremath{\psi}(3770)$ in Mark III detector SPEAR. From a sample events kinematically selected as ${D}^{+}{D}^{\ensuremath{-}}$ or ${D}^{0}{\overline{D}}^{0}$ pairs, $R({D}^{+}\ensuremath{\rightarrow}{e}^{+}+X)=(17.0\ifmmode\pm\else\textpm\fi{}1.9\ifmmode\pm\else\textpm\fi{}0.7)%$...
Results from a detailed study using the Crystal Ball detector at SLAC e+e− storage ring SPEAR of inclusive photon spectra 1.8×106 ψ’ and 2.2×106 J/ψ decays are presented. Radiative transitions to χ2,1,0 states observed with energies 126.0±0.2±4, 169.6±0.3±4, 258.4±0.4±4 MeV branching ratios B(ψ’→γχ2,1,0) =(8.0±0.5±0.7)%, (9.0±0.5±0.7)%, (9.9±0.5±0.8)%, respectively. Values for natural linewidths χ obtained: Γ(χ2,1,0)=0.8–4.9, <3.8, 13–21 MeV, respectively (90% C.L.). Improved values found...
From a partial-wave analysis of the $K\overline{K}\ensuremath{\pi}$ system in decay $\frac{J}{\ensuremath{\psi}}\ensuremath{\rightarrow}\ensuremath{\gamma}{K}^{+}{K}^{\ensuremath{-}}{\ensuremath{\pi}}^{0}$, it is determined that quantum numbers resonance at 1440 MeV, previously identified as $E(1420)$, are ${J}^{\mathrm{PC}}={0}^{\ensuremath{-}+}$. This new particle has been named $\ensuremath{\iota}$.
Measurements of the exclusive branching fractions B(D0→π−e+νe) and B(D0→K−e+νe), using data collected at ψ(3770) with Mark III detector SLAC e+e− storage ring SPEAR, are used to determine ratio Kobayashi-Maskawa matrix elements ‖Vcd/Vcs∥2 =0.057±+0.0380.015±0.005.Received 30 December 1988DOI:https://doi.org/10.1103/PhysRevLett.62.1821©1989 American Physical Society
We report on the design, fabrication, and first tests of a tomographic scanner developed for proton computed tomography (pCT) head-sized objects. After extensive preclinical testing, pCT is intended to be employed in support therapy treatment planning pre-treatment verification patients undergoing particle-beam therapy. The consists two silicon-strip telescopes that track individual protons before after phantom, novel multistage scintillation detector measures combination residual energy...
This paper reports the latest technological development on Low Gain Avalanche Detector (LGAD) and introduces a new architecture of these detectors called inverse-LGAD (iLGAD). Both approaches are based standard Photo Diodes (APD) concept, commonly used in optical X-ray detection applications, including an internal multiplication charge generated by radiation. The is inherent to basic n++–p+–p structure, where doping profile p+ layer optimized achieve high field impact ionization at junction....
Purpose: Proton computed tomography (pCT) will enable accurate prediction of proton and ion range in a patient while providing the benefit lower radiation exposure than x‐ray CT. The accuracy is essential for treatment planning or therapy depends upon detector used to evaluate water‐equivalent path length (WEPL) passing through object. A novel approach presented an inexpensive WEPL pCT radiography. Methods: multistage with aperture 10 × 37.5 cm was designed optimize measurements simplifying...
In this contribution we will review the progresses toward construction of a tracking system able to measure passage charged particles with combined precision ∼10 ps and μm, either using single type sensor, concurrently position time, or combination time sensors.