G. Christodoulou
A5114377228- Neutrino Physics Research
- Particle physics theoretical and experimental studies
- Astrophysics and Cosmic Phenomena
- Dark Matter and Cosmic Phenomena
- Particle Detector Development and Performance
- Muon and positron interactions and applications
- Particle accelerators and beam dynamics
- Radiation Detection and Scintillator Technologies
- Nuclear Physics and Applications
- Planetary Science and Exploration
- Library Science and Information Systems
- Additive Manufacturing Materials and Processes
- Nuclear physics research studies
- Surface Treatment and Coatings
- High Entropy Alloys Studies
- Laser Material Processing Techniques
- Cancer-related cognitive impairment studies
- Brain Metastases and Treatment
- Spectroscopy and Laser Applications
- High-Temperature Coating Behaviors
- Laser and Thermal Forming Techniques
- Radioactivity and Radon Measurements
- Structural Integrity and Reliability Analysis
- Atomic and Subatomic Physics Research
- Metal Alloys Wear and Properties
European Organization for Nuclear Research
2019-2023
University of Liverpool
2011-2019
University of Bern
2011
American Society for Gastrointestinal Endoscopy
2005
Hy-Line (United States)
2005
Eginition Hospital
2000
Imperial Valley College
1982
Imperial College London
1981
Cranfield University
1980
The T2K experiment observes indications of ν(μ) → ν(e) appearance in data accumulated with 1.43×10(20) protons on target. Six events pass all selection criteria at the far detector. In a three-flavor neutrino oscillation scenario |Δm(23)(2)| = 2.4×10(-3) eV(2), sin(2)2θ(23) 1 and sin(2)2θ(13) 0, expected number such is 1.5±0.3(syst). Under this hypothesis, probability to observe six or more candidate 7×10(-3), equivalent 2.5σ significance. At 90% C.L., are consistent 0.03(0.04) < 0.28(0.34)...
The T2K experiment is a long baseline neutrino oscillation experiment. Its main goal to measure the last unknown lepton sector mixing angle θ13 by observing νe appearance in νμ beam. It also aims make precision measurement of known parameters, Δm232 and sin22θ23, via disappearance studies. Other goals include various cross-section measurements sterile searches. uses an intense proton beam generated J-PARC accelerator Tokai, Japan, composed beamline, near detector complex (ND280), far...
The T2K experiment has observed electron neutrino appearance in a muon beam produced 295 km from the Super-Kamiokande detector with peak energy of 0.6 GeV. A total 28 events were detected an distribution consistent signal, corresponding to significance 7.3σ when compared 4.92±0.55 expected background events. In Pontecorvo-Maki-Nakagawa-Sakata mixing model, signal depends on several parameters including three angles θ12, θ23, θ13, mass difference Δm232 and CP violating phase δCP. this...
We report on measurements of neutrino oscillation using data from the T2K long-baseline experiment collected between 2010 and 2013. In an analysis muon disappearance alone, we find following estimates 68% confidence intervals for two possible mass hierarchies: Normal Hierarchy: $\sin^2\theta_{23}=0.514^{+0.055}_{-0.056}$ $\Delta m^2_{32}=(2.51\pm0.10)\times 10^{-3}$ eV$^2$/c$^4$ Inverted $\sin^2\theta_{23}=0.511\pm0.055$ m^2_{13}=(2.48\pm0.10)\times The accounts multi-nucleon mechanisms in...
The Tokai-to-Kamioka (T2K) experiment studies neutrino oscillations using an off-axis muon beam with a peak energy of about 0.6 GeV that originates at the J-PARC accelerator facility. Interactions neutrinos are observed near detectors placed 280 m from production target and far detector -- Super-Kamiokande (SK) located 295 km away. flux prediction is essential part successful interaction rates T2K important input to oscillation cross section measurements. A FLUKA GEANT3 based simulation...
The T2K experiment measures muon neutrino disappearance and electron appearance in accelerator-produced antineutrino beams. With an exposure of 14.7(7.6)×1020 protons on target the (antineutrino) mode, 89 νe candidates seven anti-νe are observed, while 67.5 9.0 expected for δCP=0 normal mass ordering. obtained 2σ confidence interval CP-violating phase, δCP, does not include CP-conserving cases (δCP=0, π). best-fit values other parameters sin2θ23=0.526+0.032−0.036 Δm232=2.463+0.071−0.070×10−3...
New data from the T2K neutrino oscillation experiment produce most precise measurement of mixing parameter ${\ensuremath{\theta}}_{23}$. Using an off-axis beam with a peak energy 0.6 GeV and set corresponding to $6.57\ifmmode\times\else\texttimes\fi{}1{0}^{20}$ protons on target, has fit energy-dependent ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ probability determine parameters. The 68% confidence limit ${\mathrm{sin}}^{2}({\ensuremath{\theta}}_{23})$ is...
The T2K experiment reports updated measurements of neutrino and antineutrino oscillations using both appearance disappearance channels. This result comes from an exposure $14.9(16.4)\ifmmode\times\else\texttimes\fi{}1{0}^{20}$ protons on target in (antineutrino) mode. Significant improvements have been made to the interaction model far detector reconstruction. An extensive set simulated data studies also performed quantify effect uncertainties oscillation parameter sensitivity. performs...
T2K reports its first results in the search for CP violation neutrino oscillations using appearance and disappearance channels neutrino- antineutrino-mode beams. The data include all runs from January 2010 to May 2016 comprise 7.482×10^{20} protons on target mode, which yielded far detector 32 e-like 135 μ-like events, 7.471×10^{20} antineutrino 4 66 events. Reactor measurements of sin^{2}2θ_{13} have been used as an additional constraint. one-dimensional confidence interval at 90% phase...
The T2K collaboration: reports evidence for electron neutrino appearance at the atmospheric mass splitting, |\Delta m_{32}^2|=2.4x10^{-3} eV^2. An excess of interactions over background is observed from a muon beam with peak energy 0.6 GeV Super-Kamiokande (SK) detector 295 km beam's origin. Signal and predictions are constrained by data near detectors located 280 m production target. We observe 11 candidate events SK when 3.3\pm0.4(syst.) expected. background-only hypothesis rejected...
The T2K experiment reports an updated analysis of neutrino and antineutrino oscillations in appearance disappearance channels. A sample electron candidates at Super-Kamiokande which a pion decay has been tagged is added to the four single-ring samples used previous oscillation analyses. Through combined analyses these five samples, simultaneous measurements parameters, $|\Delta m^2_{32}|$, $\sin^2(\theta_{23})$, $\sin^2(\theta_{13})$, $\delta_{CP}$ mass ordering are made. set studies...
T2K has performed the first measurement of ${\ensuremath{\nu}}_{\ensuremath{\mu}}$ inclusive charged current interactions on carbon at neutrino energies $\ensuremath{\sim}1\text{ }\text{ }\mathrm{GeV}$ where is reported as a flux-averaged double differential cross section in muon momentum and angle. The flux predicted by beam Monte Carlo external data, including results from NA61/SHINE experiment. data used for this were taken 2010 2011, with total...
We report the measurement of muon neutrino charged-current interactions on carbon without pions in final state at T2K beam energy using $5.734\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons target. For first time is reported as a flux-integrated, double-differential cross section kinematic variables ($\mathrm{cos}{\ensuremath{\theta}}_{\ensuremath{\mu}}$, ${p}_{\ensuremath{\mu}}$), correcting for events where pion produced and then absorbed by interactions. Two analyses are performed...
This paper reports measurements of final-state proton multiplicity, muon and kinematics, their correlations in charged-current pionless neutrino interactions, measured by the T2K ND280 near detector its plastic scintillator (C8H8) target. The data were taken between years 2010 2013, corresponding to approximately 6×1020 protons on Thanks exploration kinematics imbalances results offer a novel probe nuclear-medium effects most pertinent (sub-)GeV neutrino-nucleus interactions that are used...
This paper reports on the search for heavy neutrinos with masses in range $140 < M_N 493$ MeV/c$^2$ using off-axis near detector ND280 of T2K experiment. These particles can be produced from kaon decays standard neutrino beam and then subsequently decay ND280. The modes under consideration are $N \to \ell^{\pm}_{\alpha} \pi^{\mp}$ \ell^+_{\alpha} \ell^-_{\beta} \nu (\bar\nu)$ ($\alpha,\beta=e,\mu$). A such events has been made Time Projection Chambers ND280, where background reduced to less...
We report a measurement of muon-neutrino disappearance in the T2K experiment. The 295-km beam from Tokai to Kamioka is first implementation off-axis technique long-baseline neutrino oscillation With data corresponding $1.43\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target, we observe 31 fully-contained single $\ensuremath{\mu}$-like ring events Super-Kamiokande, compared with an expectation $104\ifmmode\pm\else\textpm\fi{}14\text{ }(\mathrm{syst})$ without oscillations. best-fit...
The T2K Collaboration reports a precision measurement of muon neutrino disappearance with an off-axis beam peak energy 0.6 GeV. Near detector measurements are used to constrain the flux and cross section parameters. Super-Kamiokande far detector, which is 295 km downstream production target, collected data corresponding $3.01\ifmmode\times\else\texttimes\fi{}{10}^{20}$ protons on target. In absence oscillations, $205\ifmmode\pm\else\textpm\fi{}17$ (syst) events expected be detected while...
The preponderance of matter over antimatter in the early Universe, dynamics supernova bursts that produced heavy elements necessary for life and whether protons eventually decay --- these mysteries at forefront particle physics astrophysics are key to understanding evolution our its current state eventual fate. Long-Baseline Neutrino Experiment (LBNE) represents an extensively developed plan a world-class experiment dedicated addressing questions. LBNE is conceived around three central...
The observation of the recent electron neutrino appearance in a muon beam and high-precision measurement mixing angle |$\theta _{13}$| have led to re-evaluation physics potential T2K long-baseline oscillation experiment. Sensitivities are explored for CP violation neutrinos, non-maximal |$\sin ^22\theta _{23}$|, octant mass hierarchy, addition measurements |$\delta _{{\rm CP}}$|, ^2\theta |$\Delta m^2_{32}$|, various combinations |$\nu$|-mode |$\bar {\nu }$|-mode data-taking. With an...
In this document, we present the Technical Design Report of Upgrade T2K Near Detector ND280. The goal upgrade is to improve performance measure neutrino interaction rate and constrain cross-sections so that uncertainty in number predicted events at Super-Kamiokande reduced about 4%. This will allow physics reach T2K-II project. achieved by modifying upstream part detector, adding a new highly granular scintillator detector (Super-FGD), two TPCs (High-Angle TPC) six TOF planes. Details...
The T2K experiment studies oscillations of an off-axis muon neutrino beam between the J-PARC accelerator complex and Super-Kamiokande detector. Special emphasis is placed on measuring mixing angle theta_13 by observing electron appearance via sub-dominant to oscillation, searching for CP violation in lepton sector. includes a sophisticated, off-axis, near detector, ND280, situated 280 m downstream production target order measure properties understand better interactions at energy scale below...
The next generation neutrino observatory proposed by the LBNO collaboration will address fundamental questions in particle and astroparticle physics. experiment consists of a far detector, its first stage 20 kt LAr double phase TPC magnetised iron calorimeter, situated at 2300 km from CERN near detector based on highpressure argon gas TPC. long baseline provides unique opportunity to study flavour oscillations over their 1st 2nd oscillation maxima exploring L/E behaviour, distinguishing...