A5035367751- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Quantum Chromodynamics and Particle Interactions
- Particle Detector Development and Performance
- Dark Matter and Cosmic Phenomena
- Pulsars and Gravitational Waves Research
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Gamma-ray bursts and supernovae
- Computational Physics and Python Applications
- Geophysics and Gravity Measurements
- Astrophysics and Cosmic Phenomena
- Black Holes and Theoretical Physics
- Astrophysical Phenomena and Observations
- Atomic and Subatomic Physics Research
- Cold Atom Physics and Bose-Einstein Condensates
- High-pressure geophysics and materials
- Medical Imaging Techniques and Applications
- Radio Astronomy Observations and Technology
- Radiation Detection and Scintillator Technologies
- Distributed and Parallel Computing Systems
- Particle Accelerators and Free-Electron Lasers
- Superconducting Materials and Applications
- Seismic Waves and Analysis
- Muon and positron interactions and applications
University of Amsterdam
2014-2024
National Institute for Subatomic Physics
2015-2024
Amsterdam University of the Arts
2005-2020
Istituto Nazionale di Fisica Nucleare, Sezione di Perugia
2019
University of Perugia
2019
Stanford University
2018
The University of Adelaide
2013-2016
Uppsala University
2014-2016
Lund University
2015-2016
University of Liverpool
2015-2016
DARk matter WImp search with liquid xenoN (DARWIN) will be an experiment for the direct detection of dark using a multi-ton xenon time projection chamber at its core. Its primary goal to explore experimentally accessible parameter space Weakly Interacting Massive Particles (WIMPs) in wide mass-range, until neutrino interactions target become irreducible background. The prompt scintillation light and charge signals induced by particle observed VUV sensitive, ultra-low background photosensors....
We perform a low-mass dark matter search using an exposure of $30\text{ }\text{ }\mathrm{kg}\ifmmode\times\else\texttimes\fi{}\mathrm{yr}$ with the XENON100 detector. By dropping requirement scintillation signal and only ionization to determine interaction energy, we lowered energy threshold for detection 0.7 keV nuclear recoils. No can be claimed because complete background model cannot constructed without primary signal. Instead, compute upper limit on WIMP-nucleon scattering cross section...
We report measurements of π±K±, and p, ¯p inclusive cross sections fractions in e+e− annihilation at √s=29 GeV, for the momentum interval 0.01<z=ppbeam<0.90. The analysis is based on approximately 70 pb−1 data collected with TPC2γ detector facility SLAC storage ring PEP. Detector upgrades result significantly improved coverage precision data, compared to previous measurements.Received 9 May 1988DOI:https://doi.org/10.1103/PhysRevLett.61.1263©1988 American Physical Society
We report measurements of the two-photon processes ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ and ${e}^{+}{e}^{\ensuremath{-}}\ensuremath{\rightarrow}{e}^{+}{e}^{\ensuremath{-}}{K}^{+}{K}^{\ensuremath{-}}$, at an ${e}^{+}{e}^{\ensuremath{-}}$ center-of-mass energy 29 GeV. In ${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ data a high-statistics analysis $f(1270)$ results in...
The TPC/Two-Gamma facility at the SLAC e+e− storage ring PEP was used to study reactions γγ*→η and γγ*→η'. ηγ*γ η'γ*γ transition form factors were measured as functions of Q2, negative invariant mass squared tagged photon, in range 0.1<Q2<7 GeV2. These determinations electromagnetic structure η η' mesons are consistent with both vector-meson dominance QCD. They also provide new measurements pseudoscalar mixing angle decay constants.Received 21 August...
We have observed the formation of two spin-one mesons in \ensuremath{\gamma}\ensuremath{\gamma} fusion reactions which one photon was highly virtual. The first, consistent with being ${J}^{\mathrm{PC}}$${=1}^{++}$ ${f}_{1}$(1285), seen final state \ensuremath{\eta}${\ensuremath{\pi}}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$ (\ensuremath{\eta}\ensuremath{\rightarrow}\ensuremath{\gamma}\ensuremath{\gamma}), as \ensuremath{\eta}'(958). previously reported observation second state,...
Two-photon production of KS0K±π∓ states has been studied by the TPC/Two-Gamma experiment at SLAC storage ring PEP. A resonance mass 1.42 GeV was seen when one photons quite virtual but not both were nearly real. Production a spin-1 meson, which cannot be made two real photons, would fit these observations. The Q2 dependence data in region agrees with this spin assignment and is incompatible spin-0 hypothesis. width are similar to those E assigned JP=0− JP=1+ different experiments.Received 14...
Results are presented on the exclusive production of four-prong final states in photon-photon collisions from TPC/Two-Gamma detector at SLAC ${e}^{+}$${e}^{\mathrm{\ensuremath{-}}}$ storage ring PEP. Measurement dE/dx and momentum time-projection chamber (TPC) provides identification 2${\ensuremath{\pi}}^{+}$2${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$, ${K}^{+}$${K}^{\mathrm{\ensuremath{-}}}$${\ensuremath{\pi}}^{+}$${\ensuremath{\pi}}^{\mathrm{\ensuremath{-}}}$,...
By observing the reaction γγ→Ks0K±π∓, TPC/Two-Gamma experiment at SLAC e+e− storage ring PEP has obtained a 95%-confidence-level limit of Γι→γγB(ι→KK¯π)<1.6 keV for ι(1450) meson. If, as is likely, ι decays predominantly into KK¯π, resulting Γι→γγ appears to conflict with previous assignments an observed ργ decay and also many analyses η-η’-ι mixing. The contrast this small γγ width large rate J/ψ→γι evidence that glueball little admixture qq¯ states.Received 6 March...
We compare the particle flow in event plane of three-jet $q\overline{q}g$ (quark-antiquark-gluon) events with radiative annihilation $q\overline{q}\ensuremath{\gamma}$ (quark-antiquark-photon) for similar kinematic configurations. In angular region between quark and antiquark jet, we find a significant decrease density as compared to $q\overline{q}\ensuremath{\gamma}$. This effect is predicted QCD result destructive interference soft-gluon radiation from quark, antiquark, hard gluon.
We report measurements of two-particle correlations in rapidity space between a p¯ or Λ¯ and an additional p, p¯, Λ, Λ¯. find evidence for local conservation baryon number, the first time observe pronounced anticorrelation baryons with same value number. Such is expected fragmentation models where order particles closely reflects their ''color order,'' as case, example, recent versions Lund string model.Received 14 October 1986DOI:https://doi.org/10.1103/PhysRevLett.57.3140©1986 American...
The structure function Fγ2 for a quasireal photon has been measured in the reaction ee→eeX Q2 range 0.2<Q2<7 GeV2, by use of 9200 multihadron events obtained with TPC/Two-Gamma detector at SLAC storage ring PEP. data have corrected effects regularized unfolding procedure and are presented as Fγ2(x,Q2). shows scaling region 0.3<Q2<1.6 x<0.3, rises higher x>0.1. Below Q2=0.3 breaks down accordance finite cross-section bound real photons.Received 3 September...
The measurement of the magnetic field in tracking volume inside superconducting coil Compact Muon Solenoid (CMS) detector under construction at CERN is done with a fieldmapper designed and produced Fermilab. uses 10 3-D B-sensors (Hall probes) developed NIKHEF calibrated to precision 0.05% for nominal 4 T field. precise measurements are 33840 points cylinder 1.724 m radius 7 long central fields 2, 3, 3.5, 3.8, T. Three components flux density CMS maximum excitation remanent on steel-air...
We present a measurement of the total cross section for γγ→hadrons, with one photon quasireal and other spacelike mass squared −Q2. Results are presented as function Q2 γγ center-of-mass energy W, range extending from 0.2 to 60 GeV2, W in 2 10 GeV. The data were taken TPC/Two-Gamma facility at SLAC e+e− storage ring PEP, which was operated beam 14.5 exhibits gentle falloff increasing W. Its dependence is shown be well described by an incoherent sum vector-meson pointlike scattering over most...
We have searched for the two-photon production of ηc, χ0, and χ2 charmonium states at SLAC e+e− collider PEP in channels γγ→K±K0Sπ∓, γγ→K+K−π+π−, γγ→π+π−π+π−, γγ→K+K−K+K−. identify four ηc candidates K+K−K+K− channel on a negligible background; one φφ event among them implies 95%-confidence-level (C.L.) lower limit Γγγ(ηc) 1.7 keV. In other we find no evidence any three states. establish 95%-C.L. upper limits Γγγ(ηc)<15.5 keV, Γγγ(χ0)<17.0 Γγγ(χ2)<4.2 From all combined, obtain value...