A5032670568- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Particle Detector Development and Performance
- Quantum Chromodynamics and Particle Interactions
- Computational Physics and Python Applications
- Dark Matter and Cosmic Phenomena
- Cosmology and Gravitation Theories
- Neutrino Physics Research
- Radiation Detection and Scintillator Technologies
- Black Holes and Theoretical Physics
- Medical Imaging Techniques and Applications
- Nuclear physics research studies
- Particle Accelerators and Free-Electron Lasers
- Astrophysics and Cosmic Phenomena
- Distributed and Parallel Computing Systems
- Atomic and Subatomic Physics Research
- Nuclear Physics and Applications
- Superconducting Materials and Applications
- advanced mathematical theories
- Quantum and electron transport phenomena
- Galaxies: Formation, Evolution, Phenomena
- Muon and positron interactions and applications
- X-ray Spectroscopy and Fluorescence Analysis
- Relativity and Gravitational Theory
- Advanced Differential Geometry Research
Institut de Recherche sur les Lois Fondamentales de l'Univers
2015-2024
CEA Paris-Saclay
2015-2024
Commissariat à l'Énergie Atomique et aux Énergies Alternatives
2015-2024
The University of Adelaide
2016-2024
Université Paris-Saclay
2018-2024
University of California, Irvine
2021
Lund University
2020
Johannes Gutenberg University Mainz
2019
Center for NanoScience
2014-2017
Ludwig-Maximilians-Universität München
2014-2017
We present the first measurement of photoproduction J/ψ and two-photon production high-mass e+e− pairs in electromagnetic (or ultra-peripheral) nucleus–nucleus interactions, using Au + data at sNN=200 GeV. The events are tagged with forward neutrons emitted following Coulomb excitation one or both Au⋆ nuclei. event sample consists 28 me+e−>2 GeV/c2 zero like-sign background. measured cross sections midrapidity dσ/dy(J/ψ+Xn,y=0)=76±33(stat)±11(syst) μb...
We present inclusive charged hadron elliptic flow (${v}_{2}$) measured over the pseudorapidity range $|\ensuremath{\eta}|<0.35$ in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathit{NN}}}=200$ GeV. Results for ${v}_{2}$ are presented a broad of transverse momentum $({p}_{T}=0.2\text{\ensuremath{-}}8.0$ GeV/$c$) and centrality (0--60%). To study nonflow effects that correlations other than collective flow, as well fluctuations ${v}_{2}$, we compare two different analysis methods: (1)...
Measurements of the azimuthal anisotropy high-${p}_{T}$ neutral pion (${\ensuremath{\pi}}^{0}$) production in $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{{}_{\mathit{NN}}}}=200$ GeV by PHENIX experiment are presented. The data included this article were collected during 2004 Relativistic Heavy Ion Collider running period and represent approximately an order magnitude increase number analyzed events relative to previously published results. Azimuthal angle distributions...
We study the renormalization group running of cosmological and Newton constants, where scale is given by inverse radius event horizon. In this framework, we discuss future evolution universe, find stable de Sitter solutions, but also 'big crunch'-like rip'-like events, depending on choice parameters in model.
We demonstrate that there exists a large class of action functionals the scalar curvature and Gauss-Bonnet invariant which are able to relax dynamically cosmological constant (CC), whatever it be its starting value in early universe. Hence, is possible understand, without fine-tuning, very small current CC as compared theoretically expected quantum field theory string theory. In our framework, this relaxation appears pure gravitational effect, where no ad hoc fields needed. The involves...
A three-dimensional correlation function obtained from midrapidity, low p(T), pion pairs in central Au+Au collisions at sqrt[s(NN)]=200 GeV is studied. The extracted model-independent source indicates a long range tail the directions of pair transverse momentum (out) and beam (long). proper breakup time tau(0) ~ 9 fm/c mean emission duration Delta tau 2 fm/c, leading to sizable differences ({|Delta t(LCM)|} approximately 12 fm/c), are required allow models be successfully matched these...
Excitation functions A(N)(p(p),Theta(c.m.)) of the analyzing power in pp--> elastic scattering have been measured with a polarized atomic hydrogen target for projectile momenta p(p) between 1000 and 3300 MeV/ c. The experiment was performed angles 30 degrees </=Theta(c.m.)</=90 using recirculating beam proton storage ring COSY during acceleration. resulting excitation angular distributions high internal consistency significant impact on recent phase shift solution SAID SP99, particular, spin...
Bose-Einstein correlations of charged kaons are used to probe $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{\mathrm{NN}}}=200\text{ }\text{ }\mathrm{GeV}$ and compared pion probes, which have a larger hadronic scattering cross section. Three-dimensional Gaussian source radii extracted, along with one-dimensional kaon emission function. The centrality dependences the three well described by single linear function ${N}_{\mathrm{part}}^{1/3}$ zero intercept. Imaging analysis shows...
Recently, a mechanism for relaxing large cosmological constant (CC) has been proposed [arxiv:0902.2215], which permits solutions with low Hubble rates at late times without fine-tuning. The setup is implemented in the LXCDM framework, and we found reasonable background evolution similar to LCDM model fine-tuned CC. In this work analyse analytically perturbations relaxation model, show that their also especially matter era. Some tracking properties of vacuum energy are discussed, too.
At the Cooler Synchrotron COSY/J\"ulich spin-correlation parameters in elastic proton-proton ($pp$) scattering have been measured with a 2.11 GeV polarized proton beam and hydrogen atomic target. We report results for ${A}_{NN}$, ${A}_{SS}$, ${A}_{SL}$ c.m. angles between $30\ifmmode^\circ\else\textdegree\fi{}$ $90\ifmmode^\circ\else\textdegree\fi{}$. Our data on ${A}_{SS}$---the first measurement of this observable above 800 MeV---clearly disagrees predictions available $pp$ phase-shift...
Measurements of the eta meson production with a polarised proton beam in reaction p(pol) p --> have been carried out at an excess energy Q = 40 MeV. The dependence analysing power A_y on polar angle theta^*_q center mass system (CMS) has studied. data indicate possibility influence p- and d-waves to close threshold production.
Measurements in Au+Au collisions at sqrt[s_{NN}]=200 GeV of jet correlations for a trigger hadron intermediate transverse momentum (p_{T,trig}) with associated mesons or baryons lower p_{T,assoc} indicate strong modification the away-side jet. The ratio jet-associated to increases centrality and p_{T,assoc}. For most central collisions, is similar that inclusive measurements. This trend incompatible in-vacuum fragmentation but could be due jetlike contributions from correlated soft partons,...
Excitation functions of the spin correlation coefficients ${A}_{\mathit{NN}}({p}_{\mathrm{lab}},{\ensuremath{\theta}}_{c.m.}),{A}_{\mathit{SS}}({p}_{\mathrm{lab}},{\ensuremath{\theta}}_{c.m.})$, and ${A}_{\mathit{SL}}({p}_{\mathrm{lab}},{\ensuremath{\theta}}_{c.m.})$ have been measured with polarized proton beam Cooler Synchrotron an internal atomic target. Data were taken continuously during acceleration for momenta ${p}_{\mathrm{lab}}$ ranging from 1000 to 3300 MeV/c (kinetic energies...
We establish an indirect link between relic neutrinos and the dark energy sector which originates from vacuum contributions of neutrino quantum fields. Via renormalization group effects they induce a running cosmological constant with time dynamically influences evolution cosmic background. demonstrate that resulting reduction abundance allows us to largely evade current mass bounds discuss how scenario might be probed help future large scale structure surveys Planck data.
In the recently proposed cosmological constant (CC) filter mechanism based on modified gravity in Palatini formalism, radiation, matter and late-time de Sitter eras is insensitive to energy sources with equation of state -1. This implies that finite vacuum shifts from phase transitions are filtered out, too. this work we investigate CC model at very early times. We find initial big bang singularity replaced by a cosmic bounce, where density curvature finite. certain case finiteness can be...
The monitored drift tube (MDT) chambers for the muon spectrometer of ATLAS detector at Large Hadron Collider (LHC) consist three or four layers pressurised tubes on either side a space frame carrying an optical deformation monitoring system. have to provide track position resolution 40 /spl mu/m with single-tube least 80 and sense wire positioning accuracy 20 (rms). feasibility was demonstrated full-scale prototype one largest MDT 432 3.8 m length. For spectrometer, 88 this type be built....