Yannis K. Semertzidis
A5073649257- Dark Matter and Cosmic Phenomena
- Particle physics theoretical and experimental studies
- Atomic and Subatomic Physics Research
- Cosmology and Gravitation Theories
- Particle Detector Development and Performance
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Particle accelerators and beam dynamics
- Muon and positron interactions and applications
- Physics of Superconductivity and Magnetism
- Superconducting Materials and Applications
- Computational Physics and Python Applications
- Neutrino Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum Chromodynamics and Particle Interactions
- Solar and Space Plasma Dynamics
- High-Energy Particle Collisions Research
- Quantum, superfluid, helium dynamics
- Scientific Research and Discoveries
- Superconducting and THz Device Technology
- Advanced NMR Techniques and Applications
- Quantum Information and Cryptography
- Iron-based superconductors research
- Nuclear Physics and Applications
- Magnetic confinement fusion research
Korea Advanced Institute of Science and Technology
2015-2024
Institute for Basic Science
2015-2024
Boğaziçi University
2024
RIKEN
2022
RIKEN Center for Quantum Computing
2022
ORCID
2021
Korea Astronomy and Space Science Institute
2021
Brookhaven National Laboratory
2007-2020
University of Massachusetts Amherst
2019
Korea Research Institute of Standards and Science
2019
We present the final report from a series of precision measurements muon anomalous magnetic moment, ${a}_{\ensuremath{\mu}}=(g\ensuremath{-}2)/2$. The details experimental method, apparatus, data taking, and analysis are summarized. Data obtained at Brookhaven National Laboratory, using nearly equal samples positive negative muons, were used to deduce ${a}_{\ensuremath{\mu}}(\mathrm{\text{Expt}})=11659208.0(5.4)(3.3)\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}10}$, where...
The anomalous magnetic moment of the negative muon has been measured to a precision 0.7 ppm (ppm) at Brookhaven Alternating Gradient Synchrotron. This result is based on data collected in 2001, and over an order magnitude more precise than previous measurement for muon. a(mu(-))=11 659 214(8)(3) x 10(-10) (0.7 ppm), where first uncertainty statistical second systematic, consistent with measurements anomaly positive average a(mu)(exp)=11 208(6) (0.5 ppm).
Hypothetical low-mass particles, such as axions, provide a compelling explanation for the dark matter in universe. Such particles are expected to emerge abundantly from hot interior of stars. To test this prediction, CERN Axion Solar Telescope (CAST) uses 9 T refurbished Large Hadron Collider magnet directed towards Sun. In strong magnetic field, solar axions can be converted X-ray photons which recorded by detectors. 2013–2015 run, thanks low-background detectors and new telescope,...
A precise measurement of the anomalous g value, a(mu) = (g-2)/2, for positive muon has been made at Brookhaven Alternating Gradient Synchrotron. The result a(mu+) 11 659 202(14) (6) x 10(-10) (1.3 ppm) is in good agreement with previous measurements and an error one third that combined data. current theoretical value from standard model a(mu)(SM) 159.6(6.7) (0.57 a(mu)(exp) - 43(16) which world average experimental value.
We have searched for solar axions or similar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup with improved conditions in all detectors. From absence of excess X-rays when magnet was pointing Sun, we set an upper limit on axion-photon coupling 8.8 x 10^{-11} GeV^{-1} at 95% CL m_a <~ 0.02 eV. This result is best experimental over a broad range axion masses and eV also supersedes previous derived from energy-loss arguments globular-cluster stars.
Three independent searches for an electric dipole moment (EDM) of the positive and negative muons have been performed, using spin precession data from muon g-2 storage ring at Brookhaven National Laboratory. Details on experimental apparatus three analyses are presented. Since individual results muon, as well combined result, d=-0.1(0.9)E-19 e-cm, all consistent with zero, we set a new EDM limit, |d| < 1.9E-19 e-cm (95% C.L.). This represents factor 5 improvement over previous best limit EDM.
The International Axion Observatory (IAXO) will be a forth generation axion helioscope. As its primary physics goal, IAXO look for axions or axion-like particles (ALPs) originating in the Sun via Primakoff conversion of solar plasma photons. In terms signal-to-noise ratio, about 4–5 orders magnitude more sensitive than CAST, currently most powerful helioscope, reaching sensitivity to axion-photon couplings down few × 10−12 GeV−1 and thus probing large fraction unexplored ALP parameter space....
This chapter of the report "Flavor in era LHC" Workshop discusses theoretical, phenomenological and experimental issues related to flavor phenomena charged lepton sector conserving CP-violating processes. We review current limits main theoretical models for structure fundamental particles. analyze consequences available data, setting constraints on explicit beyond standard model, presenting benchmarks discovery potential forthcoming measurements both at LHC low energy, exploring options...
Abstract The Physics Beyond Colliders initiative is an exploratory study aimed at exploiting the full scientific potential of CERN’s accelerator complex and infrastructures through projects complementary to LHC other possible future colliders. These will target fundamental physics questions in modern particle physics. This document presents status proposals presented framework Standard Model working group, explore their reach impact that CERN could have next 10–20 years on international landscape.
This paper introduces a new approach to measure the muon magnetic moment anomaly |$a_{\mu} = (g-2)/2$| and electric dipole (EDM) |$d_{\mu}$| at J-PARC facility. The goal of our experiment is |$a_{\mu}$| using an independent method with factor 10 lower momentum, 20 smaller diameter storage-ring solenoid compared previous ongoing |$g-2$| experiments unprecedented quality storage field. Additional significant differences from present experimental include 1000 transverse emittance beam...
An axion dark matter search with the CAPP-8TB haloscope is reported. Our results are sensitive to axion-photon coupling g_{aγγ} down QCD band over mass range between 6.62 and 6.82 μeV at a 90% confidence level, which most result in date.
The Center for Axion and Precision Physics Research at the Institute Basic Science is searching axion dark matter using ultralow temperature microwave resonators. We report exclusion of mass range $10.7126--10.7186\text{ }\text{ }\ensuremath{\mu}\mathrm{eV}$ with near Kim-Shifman-Vainshtein-Zakharov (KSVZ) coupling sensitivity $10.16--11.37\text{ about 9 times larger 90% confidence level. This first search result in these ranges. It also a resonator physical less than 40 mK.
We report an axion dark matter search at Dine-Fischler-Srednicki-Zhitnitskii sensitivity with the CAPP-12TB haloscope, assuming axions contribute 100% of local density. The excluded axion-photon coupling g_{aγγ} down to about 6.2×10^{-16} GeV^{-1} over mass range between 4.51 and 4.59 μeV a 90% confidence level. achieved experimental can also exclude Kim-Shifman-Vainshtein-Zakharov that makes up just 13% haloscope will continue wide masses.
A higher precision measurement of the anomalous g value, a(mu)=(g-2)/2, for positive muon has been made at Brookhaven Alternating Gradient Synchrotron, based on data collected in year 2000. The result a(mu(+))=11 659 204(7)(5)x10(-10) (0.7 ppm) is good agreement with previous measurements and an error about one-half that combined data. present world average experimental value a(mu)(expt)=11 203(8)x10(-10) ppm).
Hypothetical axionlike particles with a two-photon interaction would be produced in the sun by Primakoff process. In laboratory magnetic field ("axion helioscope"), they transformed into x-rays energies of few keV. Using decommissioned Large Hadron Collider test magnet, CERN Axion Solar Telescope ran for about 6 months during 2003. The first results from analysis these data are presented here. No signal above background was observed, implying an upper limit to axion-photon coupling...
We have searched for light scalar and/or pseudoscalar particles that couple to two photons by studying the propagation of a laser beam ($\ensuremath{\lambda}=514$ nm) through transverse magnetic field. A limit 3.5\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}10}$ rad was set on possible optical rotation polarization an effective path length 2.2 km in 3.25 T find coupling...
We report preliminary results from a search for galactic axions in the frequency range 1.09${f}_{a}$1.22 GHz. For an axion linewidth ${\ensuremath{\Gamma}}_{a}$\ensuremath{\le}200 Hz we obtain experimental limit (${g}_{a\ensuremath{\gamma}\ensuremath{\gamma}}$/${m}_{a}$${)}^{2}$${\ensuremath{\rho}}_{a}$1.4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}41}$. The theoretical prediction is...
A microwave cavity experiment designed to search for the signal from cosmic axions converting in an external magnetic field covered mass range (4.5-16.3)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}6}$ eV, corresponding frequency 1.09 3.93 GHz. Upper limits on coupling and abundance of nonrelativistic galactic have been measured; these yield a which is 1-2 orders magnitude higher than that predicted by Dine-Fischler-Srednicki model. Also presented are with continuum spectrum,...
A new highly sensitive method of looking for electric dipole moments charged particles in storage rings is described. The major systematic errors inherent the are addressed and ways to minimize them suggested. It seems possible measure muon EDM levels that test speculative theories beyond standard model.
We have searched for solar axions or other pseudoscalar particles that couple to two photons by using the CERN Axion Solar Telescope (CAST) setup. Whereas we previously reported results from CAST with evacuated magnet bores (Phase I), setting limits on lower mass axions, here report where were filled 4He gas II) of variable pressure. The introduction generates a refractive photon mγ, thereby achieving maximum possible conversion rate those axion masses ma match mγ. With 160 different...
A new experiment is described to detect a permanent electric dipole moment of the proton with sensitivity $10^{-29}e\cdot$cm by using polarized "magic" momentum $0.7$~GeV/c protons in an all-electric storage ring. Systematic errors relevant are discussed and techniques address them presented. The measurement sensitive physics beyond Standard Model at scale 3000~TeV.
We present the first results of a search for invisible axion dark matter using multiple-cell cavity haloscope. This concept was proposed to provide highly efficient approach high mass regions compared conventional multiple-cavity design, with larger detection volume, simpler detector setup, and unique phase-matching mechanism. Searches double-cell superseded previous reports axion-photon coupling over range between 13.0 13.9$\,\mu$eV. result not only demonstrates novelty high-mass searches,...
Abstract Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the of topological defects that could concentrate matter density into many distinct, compact spatial regions small compared with Galaxy but much larger than Earth. Here we report results search transient signals from domain walls by using global network optical magnetometers exotic (GNOME) physics searches. We data, consisting correlated...
A bstract We present results of the Relic Axion Dark-Matter Exploratory Setup (RADES), a detector which is part CERN Solar Telescope (CAST), searching for axion dark matter in 34.67 μ eV mass range. radio frequency cavity consisting 5 sub-cavities coupled by inductive irises took physics data inside CAST dipole magnet first time using this filter-like haloscope geometry. An exclusion limit with 95% credibility level on axion-photon coupling constant g aγ ≳ 4 × 10 − 13 GeV 1 over range 34 ....