Y. Kuno
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View article: <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mi>μ</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mo stretchy="false">→</mml:mo><mml:msup><mml:mi>e</mml:mi><mml:mo>−</mml:mo></mml:msup><mml:mi>γ</mml:mi></mml:math> in a muonic atom as a probe for effective lepton-flavor-violating operators involving photon fields
in a muonic atom as a probe for effective lepton-flavor-violating operators involving photon fields Open
We propose the μ−→e−γ process in a muonic atom as a novel means to investigate charged lepton flavor violation (CLFV). We demonstrate its sensitivity in probing effective CLFV operators associated with both single and double photon fields.…
View article: $μ^- \to e^-γ$ in a muonic atom as a probe for effective lepton flavor violating operators involving photon fields
$μ^- \to e^-γ$ in a muonic atom as a probe for effective lepton flavor violating operators involving photon fields Open
We propose the $μ^-\to e^-γ$ process in a muonic atom as a novel means to investigate charged lepton flavor violation (CLFV). We demonstrate its sensitivity in probing effective CLFV operators associated with both single and double photon …
View article: Publisher Correction: Transverse emittance reduction in muon beams by ionization cooling
Publisher Correction: Transverse emittance reduction in muon beams by ionization cooling Open
Accelerated muon beams have been considered for the next-generation studies of high-energy lepton–antilepton collisions and neutrino oscillations. However, high-brightness muon beams have not yet been produced. The main challenge for muon …
View article: Transverse Emittance Reduction in Muon Beams by Ionization Cooling
Transverse Emittance Reduction in Muon Beams by Ionization Cooling Open
Accelerated muon beams have been considered for next-generation studies of high-energy lepton-antilepton collisions and neutrino oscillations. However, high-brightness muon beams have not yet been produced. The main challenge for muon acce…
View article: Charged Lepton Flavour Violation
Charged Lepton Flavour Violation Open
Charged lepton flavour violation (CLFV) represents a tantalizing window into physics beyond the Standard Model (SM). This manuscript highlights the significance of CLFV, in particular with muons, and their experimental searches.
View article: Multiple Coulomb scattering of muons in lithium hydride
Multiple Coulomb scattering of muons in lithium hydride Open
Multiple Coulomb scattering (MCS) is a well-known phenomenon occurring when charged particles traverse materials. Measurements of muons traversing low Z materials made in the MuScat experiment showed that theoretical models and simulation …
View article: Measurement of proton, deuteron, triton, and <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mi>α</mml:mi></mml:math> particle emission after nuclear muon capture on Al, Si, and Ti with the AlCap experiment
Measurement of proton, deuteron, triton, and particle emission after nuclear muon capture on Al, Si, and Ti with the AlCap experiment Open
Heavy charged particles after nuclear muon capture are an important nuclear physics background to the muon-to-electron conversion experiments Mu2e and COMET, which will search for charged lepton flavor violation at an unprecedented level o…
View article: A Measurement of Proton, Deuteron, Triton and Alpha Particle Emission after Nuclear Muon Capture on Al, Si and Ti with the AlCap Experiment
A Measurement of Proton, Deuteron, Triton and Alpha Particle Emission after Nuclear Muon Capture on Al, Si and Ti with the AlCap Experiment Open
Heavy charged particles after nuclear muon capture are an important nuclear physics background to the muon-to-electron conversion experiments Mu2e and COMET, which will search for charged lepton flavor violation at an unprecedented level o…
View article: Performance of the MICE diagnostic system
Performance of the MICE diagnostic system Open
Muon beams of low emittance provide the basis for the intense, well-characterised neutrino beams of a neutrino factory and for multi-TeV lepton-antilepton collisions at a muon collider. The international Muon Ionization Cooling Experiment …
View article: An FPGA-Based Trigger System With Online Track Recognition in COMET Phase-I
An FPGA-Based Trigger System With Online Track Recognition in COMET Phase-I Open
An FPGA-based online trigger system has been developed for the COMET Phase-I experiment. This experiment searches for muon-to-electron conversion, which has never been observed yet. A drift chamber and trigger counters detect a mono-energe…
View article: Development of a Cylindrical Drift Chamber for the COMET Phase-I Experiment
Development of a Cylindrical Drift Chamber for the COMET Phase-I Experiment Open
A search for \(\mu \)–e conversion, the COMET experiment, will be conducted at J-PARC. The experiment has two phases. Phase-I aims to measure the background directly and search for \(\mu \)–e conversion with a sensitivity of 10^−15. Phase-…
View article: Investigation of the Light Yield Distribution in LYSO Crystals by the Optical Spectroscopy Method for the Electromagnetic Calorimeters of the COMET Experiment
Investigation of the Light Yield Distribution in LYSO Crystals by the Optical Spectroscopy Method for the Electromagnetic Calorimeters of the COMET Experiment Open
The distribution of the light yield and luminescence intensity along LYSO:Ce crystal length is investigated. These distributions, determined by different defects and emission centers of the dopant in the crystalline structure and its distr…
View article: An FPGA-based Trigger System with Online Track Recognition in COMET\n Phase-I
An FPGA-based Trigger System with Online Track Recognition in COMET\n Phase-I Open
An FPGA-based online trigger system has been developed for the COMET Phase-I\nexperiment. This experiment searches for muon-to-electron conversion, which has\nnever been observed yet. A drift chamber and trigger counters detect a\nmono-ene…
View article: Commissioning of the Cylindrical Drift Chamber for the COMET experiment
Commissioning of the Cylindrical Drift Chamber for the COMET experiment Open
A cylindrical drift chamber (CDC) has been developed for the COMET Phase-I experiment. To search for the muon-to-electron conversion with a sensitivity of $3 \\times 10^{-15}$, the CDC is required to have momentum resolution of 200 keV/$c$…
View article: Precision experiments with muons and neutrons
Precision experiments with muons and neutrons Open
The precision experiments with muons and neutrons are described. The topics selected cover the anomalies of the muon and the neutron lifetime, and searches for charged lepton flavour violation CLFV of transition and the neutron ele…
View article: First Demonstration of Ionization Cooling by the Muon Ionization Cooling Experiment
First Demonstration of Ionization Cooling by the Muon Ionization Cooling Experiment Open
Muon colliders have the potential to carry the search for new phenomena to energies well beyond the reach of the LHC in the same or smaller footprint. Muon beams may be created through the decay of pions produced in the interaction of a pr…
View article: Recent Probes of Standard and Non-standard Neutrino Physics With Nuclei
Recent Probes of Standard and Non-standard Neutrino Physics With Nuclei Open
We review standard and non-standard neutrino physics probes that are based on nuclear measurements. We pay special attention on the discussion of prospects to extract new physics at prominent rare event measurements looking for neutrino-nu…
View article: COMET Phase-I technical design report
COMET Phase-I technical design report Open
The Technical Design for the COMET Phase-I experiment is presented in this paper. COMET is an experiment at J-PARC, Japan, which will search for neutrinoless conversion of muons into electrons in the field of an aluminum nucleus ($\mu$–$e$…
View article: Distinguishing muon LFV effective couplings using $\mu+e^-\rightarrow e^-+e^-$
Distinguishing muon LFV effective couplings using $\mu+e^-\rightarrow e^-+e^-$ Open
A search for $\mu+e^-\rightarrow e^-+e^-$ process in a muonic atom is one of the promising probe for charged lepton flavor violation (CLFV). In this work, we investigate an asymmetry of the emitted electrons when the initial muon bound by …
View article: GPU Tracking in the COMET Phase-I Cylindrical Drift Chamber
GPU Tracking in the COMET Phase-I Cylindrical Drift Chamber Open
The GPU-accelerated track finding method is investigated to track electrons from neutrinoless muon decay in the COMET Phase-I experiment. Inside the cylindrical drift chamber, one third of the signal electron trajectories are composed of m…
View article: GPGPU Tracking in the COMET Phase-I Cylindrical Drift Chamber
GPGPU Tracking in the COMET Phase-I Cylindrical Drift Chamber Open
The GPU-accelerated track finding method is investigated to track electrons from neutrinoless muon decay in the COMET Phase-I experiment. Inside the cylindrical drift chamber, one third of the signal electron trajectories are composed of m…
View article: GPU-implemented Tracking in a COMET Drift Chamber
GPU-implemented Tracking in a COMET Drift Chamber Open
Track finding with GPU-implemented fourth order Runge-Kutta (RK) method is investigated\nto track electrons from muon decay in the COMET drift chamber. In the COMET\ndrift chamber, about 30-40 \\% of signal events are composed of multiple …
View article: Construction and performance tests of the COMET CDC
Construction and performance tests of the COMET CDC Open
A cylindrical drift chamber (CDC) has been constructed for the COMET Phase-I experiment where a lepton flavor violating process, the muon-to-electron conversion, is searched for with a sensitivity of $3 \\times 10^{-15}$ at J-PARC. The CDC…
View article: Selecting μ → e conversion targets to distinguish lepton flavour-changing operators
Selecting μ → e conversion targets to distinguish lepton flavour-changing operators Open
The experimental sensitivity to $\\mu \\to e$ conversion on nuclei is set to\nimprove by four orders of magnitude in coming years. However, various operator\ncoefficients add coherently in the amplitude for $\\mu \\to e$ conversion,\nweigh…
View article: First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment
First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment Open
The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, the technique by which it is proposed to cool the muon beam at a future neutrino factory or muon collider. The emittanc…
View article: COMET - A submission to the 2020 update of the European Strategy for Particle Physics on behalf of the COMET collaboration
COMET - A submission to the 2020 update of the European Strategy for Particle Physics on behalf of the COMET collaboration Open
The search for charged lepton flavour violation (CLFV) has enormous discovery potential in probing new physics Beyond the Standard Model (BSM). Among the muonic CLFV processes, $μ\to e$ conversion is one of the most important processes, ha…