D. Hayakawa
A5108010578- 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
- Neutrino Physics Research
- Medical Imaging Techniques and Applications
- Cosmology and Gravitation Theories
- CCD and CMOS Imaging Sensors
- Computational Physics and Python Applications
- Advanced Optical Sensing Technologies
- Advancements in PLL and VCO Technologies
- Analog and Mixed-Signal Circuit Design
- Astrophysics and Cosmic Phenomena
- Nuclear Physics and Applications
- Structural Analysis of Composite Materials
- Statistical Distribution Estimation and Applications
- Space Science and Extraterrestrial Life
- Thin-Film Transistor Technologies
- Advanced MRI Techniques and Applications
- Radiomics and Machine Learning in Medical Imaging
- Climate Change Communication and Perception
- Science Education and Perceptions
- Radiation Therapy and Dosimetry
Chiba University
2022-2025
Tokyo Institute of Technology
2016-2023
University of Geneva
2018-2019
Kagoshima University
2017-2018
Rutherford Appleton Laboratory
2017
The University of Adelaide
2016-2017
University of California, Santa Cruz
2017
We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in 13.6 TeV center-of-mass energy pp collision dataset 35.4 fb^{-1} using active electronic components FASER detector Large Hadron Collider. The candidates required to have track propagating through entire length and be consistent with muon charged-current interaction. infer 153_{-13}^{+12} significance 16 standard deviations above background-only...
The FASER experiment at the LHC is designed to search for light, weakly-interacting particles produced in proton-proton collisions ATLAS interaction point that travel far-forward direction. first results from a dark photons decaying an electron-positron pair, using dataset corresponding integrated luminosity of 27.0 fb−1 collected center-of-mass energy s=13.6 TeV 2022 Run 3, are presented. No events seen almost background-free analysis, yielding world-leading constraints on with couplings...
Abstract FASER, the ForwArd Search ExpeRiment, is an experiment dedicated to searching for light, extremely weakly-interacting particles at CERN's Large Hadron Collider (LHC). Such may be produced in very forward direction of LHC's high-energy collisions and then decay visible inside FASER detector, which placed 480 m downstream ATLAS interaction point, aligned with beam axis. also includes a sub-detector, ν , designed detect neutrinos LHC study their properties. In this paper, each...
A bstract The first FASER search for a light, long-lived particle decaying into pair of photons is reported. uses LHC proton-proton collision data at $$ \sqrt{s} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msqrt> <mml:mi>s</mml:mi> </mml:msqrt> </mml:math> = 13 . 6 TeV collected in 2022 and 2023, corresponding to an integrated luminosity 57 7 fb − 1 model with axion-like particles (ALPs) dominantly coupled weak gauge bosons the primary target. Signal events are...
The first results of the study high-energy electron neutrino (ν_{e}) and muon (ν_{μ}) charged-current interactions in FASERν emulsion-tungsten detector FASER experiment at LHC are presented. A 128.8 kg subset volume was analyzed after exposure to 9.5 fb^{-1} sqrt[s]=13.6 TeV pp data. Four (eight) ν_{e} interaction candidate events observed with a statistical significance 5.2σ (5.7σ). This is direct observation particle collider includes highest-energy ν_{μ} ever detected from an artificial...
This paper presents the first results of study high-energy electron and muon neutrino charged-current interactions in FASER$\nu$ emulsion/tungsten detector FASER experiment at LHC. A subset volume, which corresponds to a target mass 128.6~kg, was exposed neutrinos from LHC $pp$ collisions with centre-of-mass energy 13.6~TeV an integrated luminosity 9.5 fb$^{-1}$. Applying stringent selections requiring electrons reconstructed above 200~GeV, four interaction candidate events are observed...
The Forward Search Experiment (FASER) at CERN’s Large Hadron Collider (LHC) has recently directly detected the first collider neutrinos. Neutrinos play an important role in all FASER analyses, either as signal or background, and it is therefore essential to understand neutrino event rates. In this study, we update previous simulations present prescriptions for theoretical predictions of fluxes cross sections, together with their associated uncertainties. With these results, discuss potential...
FASER is searching for light, weakly-interacting particles at the Large Hadron Collider. The first search Axion-like (ALPs) decaying to a photon pair using data collected in 2022 and 2023 was performed successfully excluded regions not previously ruled out. To further reduce neutrino background, new preshower detector will be installed by end of 2024. based on monolithic active pixel sensor 130 nm SiGe BiCMOS, which allow resolving pairs interacting detector. final ASICs have been produced...
Abstract The DsTau(NA65) experiment at CERN was proposed to measure an inclusive differential cross-section of $$D_s$$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msub> <mml:mi>D</mml:mi> <mml:mi>s</mml:mi> </mml:msub> </mml:math> production with decay tau lepton and neutrino in p – A interactions. DsTau detector is based on the nuclear emulsion technique, which provides excellent spatial resolution for detecting short-lived particles like charmed hadrons. This paper...
This Letter presents the measurement of energy-dependent neutrino-nucleon cross section in tungsten and differential flux muon neutrinos antineutrinos. The analysis is performed using proton-proton collision data at a center-of-mass energy 13.6 TeV corresponding to an integrated luminosity <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mrow><a:mo stretchy="false">(</a:mo><a:mn>65.6</a:mn><a:mo>±</a:mo><a:mn>1.4</a:mn><a:mo stretchy="false">)</a:mo><a:mtext>...
FASER, the ForwArd Search ExpeRiment, is an experiment dedicated to searching for light, extremely weakly-interacting particles at CERN's Large Hadron Collider (LHC). Such may be produced in very forward direction of LHC's high-energy collisions and then decay visible inside FASER detector, which placed 480 m downstream ATLAS interaction point, aligned with beam axis. also includes a sub-detector, FASER$\nu$, designed detect neutrinos LHC study their properties. In this paper, each component...
The TT-PET collaboration is developing a small animal TOF-PET scanner based on monolithic silicon pixel sensors in SiGe BiCMOS technology. demonstrator chip, small-scale version of the final detector ASIC, consists 3 x 10 matrix integrated with front-end, 50 ps binning TDC and read out logic. thinned down to 100 {\mu}m backside metallized, was operated at voltage 180 V. tests beam line minimum ionizing particles show detection efficiency greater than 99.9 % time resolution 110 ps.
Abstract Tau neutrino is the least studied lepton of Standard Model (SM). The NA65/DsTau experiment targets to investigate D s , parent particle ν τ using nuclear emulsion-based detector and decrease systematic uncertainty flux prediction from over 50 % 10 for future beam dump experiments. In experiment, emulsion detectors are exposed CERN SPS 400 GeV proton beam. To provide optimal conditions reconstruction interactions, protons required be uniformly distributed detector's surface with an...
In this paper, we propose a time-based analog-to-digital converter (ADC) architecture combining flash ADC and vernier time-to-digital (TDC) to achieve both high speed resolution. The TDC are pipelined increase the conversion speed. A charge-steering amplifier is used for low-power residue transfer. common level adjuster added output stage of stabilize against process, voltage, temperature variation. Moreover, using dynamic delayer enables operation. An 8-bit test chip fabricated with 65-nm...
Time-of-flight measurement is an important advancement in PET scanners to improve image reconstruction with a lower delivered radiation dose. This article describes the monolithic ASIC for TT-PET project, novel idea high-precision scanner small animals. The chip uses SiGe Bi-CMOS process timing measurements, integrating fully-depleted pixel matrix low-power BJT-based front-end per channel, integrated on same 100 μm thick die. target resolution of 30 ps RMS electrons from conversion 511 keV...
A monolithic pixelated silicon detector designed for high time resolution has been produced in the SG13G2 130 nm SiGe BiCMOS technology of IHP. This proof-of-concept chip contains hexagonal pixels 65 μm and side. The front-end electronics implemented provides an equivalent noise charge 90 160 e− a pixel capacitance 70 220 fF, respectively, total walk less than 1 ns. Lab measurements with 90Sr source show order 50 ps. result is competitive technologies that integrate avalanche gain mechanism.
The time-based ADC (TB-ADC) is gaining attention as a key technology to solve challenges concerning CMOS scaling; however, it cannot achieve high speeds and resolution at the same time. We proposed TB-ADC architecture combining flash TDC both resolution. using VTC are pipelined enhance conversion speed. charge steering amplifier used for low-power residue transfer. Moreover, Vernier dynamic delayer enables operation. An 8-bit test chip fabricated 65-nm demonstrated sampling frequency of 900...
We report the first direct observation of neutrino interactions at a particle collider experiment. Neutrino candidate events are identified in 13.6 TeV center-of-mass energy $pp$ collision data set 35.4 fb${}^{-1}$ using active electronic components FASER detector Large Hadron Collider. The candidates required to have track propagating through entire length and be consistent with muon charged-current interaction. infer $153^{+12}_{-13}$ significance 16 standard deviations above...
The TT-PET project aims at developing a compact Time-of-flight PET scanner with 30ps time resolution, capable of withstanding high magnetic fields and allowing for integration in traditional MRI scanner, providing complimentary real-time images. very timing resolution the is achieved thanks to new generation Silicon-Germanium (Si-Ge) amplifiers, which are embedded monolithic pixel sensors. composed 16 detection towers as well cooling blocks, arranged ring structure. multiple ultra-thin...
The TT-PET collaboration is developing a PET scanner for small animals with 30 ps time-of-flight resolution and sub-millimetre 3D detection granularity. sensitive element of the monolithic silicon pixel detector based on state-of-the-art SiGe BiCMOS technology. first ASIC prototype was produced tested in laboratory minimum ionizing particles. electronics exhibit an equivalent noise charge below 600 e− RMS pulse rise time less than 2 ns , accordance simulations. pixels capacitance 0.8 pF were...
The TT-PET collaboration is developing a small animal TOF-PET scanner based on silicon detectors featuring 30 ps RMS time resolution and intended to be inserted in an existing MRI scanner. makes use of stack layers high-Z photon-converter 100 $\mathrm{μm}$ thick sensors, achieve with 0.5 $\mathrm{\times}$ 0.2 $\mathrm{mm^{3}}$ granularity, precise depth-of-interaction measurement. In this paper we present the results Monte Carlo studies for expected data rate, TOF measurements, spatial image...
The TT-PET collaboration is developing an MRI-compatible small animal PET scanner in which the sensitive element a monolithic silicon pixel ASIC targeting 30 ps RMS time resolution. photon-detection technique based on stack of alternating layers high-Z photon converter and 100 $\mathrm{μm}$ sensors, to produce with 0.5 $\mathrm{\times}$ 0.2 $\mathrm{mm^{3}}$ granularity for precise depth-of-interaction measurement. In this paper we present results simulation studies expected data rate,...
This paper describes a novel energy-efficient, high-speed ADC architecture combining flash and TDC. A high conversion rate can be obtained owing to the coarse ADC, low-power dissipation attained using TDC as fine ADC. Moreover, capacitive coupled ramp circuit is proposed achieve linearity. test chip was fabricated 65-nm digital CMOS technology. The demonstrated sampling frequency of 500 MHz 2.0 mW, resulting in low FOM 32 fJ/conversion-step.
The first FASER search for a light, long-lived particle decaying into pair of photons is reported. uses LHC proton-proton collision data at $\sqrt{s}=13.6~\text{TeV}$ collected in 2022 and 2023, corresponding to an integrated luminosity $57.7\text{fb}^{-1}$. A model with axion-like particles (ALPs) dominantly coupled weak gauge bosons the primary target. Signal events are characterised by high-energy deposits electromagnetic calorimeter no signal veto scintillators. One event observed,...
This letter presents the measurement of energy-dependent neutrino-nucleon cross section in tungsten and differential flux muon neutrinos anti-neutrinos. The analysis is performed using proton-proton collision data at a center-of-mass energy $13.6 \, {\rm TeV}$ corresponding to an integrated luminosity $(65.6 \pm 1.4) \mathrm{fb^{-1}}$. Using active electronic components FASER detector, $338.1 21.0$ charged current neutrino interaction events are identified, with backgrounds from other...