Filtern
Erscheinungsjahr
- 2017 (237) (entfernen)
Dokumenttyp
Volltext vorhanden
- ja (237)
Gehört zur Bibliographie
- nein (237) (entfernen)
Schlagworte
- QCD phase diagram (3)
- Biophysics and structural biology (2)
- Cryo-electron microscopy (2)
- D-wave (2)
- Gabor lens (2)
- Gabor-Linse (2)
- I-wave (2)
- LHC (2)
- QCD (2)
- Research article (2)
- brain stimulation (2)
- compartmental neuron model (2)
- computational model (2)
- heavy-ion collisions (2)
- motor cortex (2)
- multi-scale modeling (2)
- strangeness (2)
- transcranial magnetic stimulation (2)
- AGN jets (1)
- ALICE detector (1)
- Angular distribution (1)
- Anti-nuclei (1)
- Atomic and molecular interactions with photons (1)
- Autophagic cell death (1)
- Beam techniques (1)
- Beschleunigerphysik (1)
- Bhabha (1)
- Bidirectional connections (1)
- Biochemical simulations (1)
- Biochemistry (1)
- Biomedical engineering (1)
- Biophysics (1)
- Boltzmann equation (1)
- Branching fraction (1)
- CO2 emission reduction targets (1)
- Casimir effect (1)
- Charmonium (1)
- Chemical Physics (1)
- Chemical physics (1)
- Chiral symmetry restoration (1)
- Collective flow (1)
- Compressed Baryonic Matter (1)
- Computational Physics (1)
- Cortical circuit (1)
- Cross section (1)
- Cross section measurements (1)
- Detector (1)
- Diabetes (1)
- Doku Mittelstufe (1)
- Dynamical critical phenomena (1)
- Electrical and electronic engineering (1)
- Electromagnetic probes (1)
- Electron-pion identification (1)
- Electronic structure of atoms and molecules (1)
- Elektronenwolke (1)
- Equation of state (1)
- Excluded volume (1)
- FAIR (1)
- FRW spacetime (1)
- Fibre/foam sandwich radiator (1)
- Fission (1)
- Free energy (1)
- Freeze-out (1)
- GSI (1)
- General relativity (1)
- General relativity equations & solutions (1)
- HADES (1)
- Hadron resonance gas (1)
- Hadrons (1)
- Heavy quarks (1)
- Imaginary chemical potential (1)
- Ionisation energy loss (1)
- Jet quenching (1)
- Jet shapes (1)
- Kaons (1)
- LINAC (1)
- Ladder-RFQ (1)
- Ligand-gated ion channel (1)
- Low & intermediate energy heavy-ion reactions (1)
- Magnetic field (1)
- Magnetic properties and materials (1)
- Magnetohydrodynamics (1)
- Md simulations (1)
- Membrane fusion (1)
- Membrane structures (1)
- Membrane transport (1)
- Meson-exchange model (1)
- Molecular dynamics (1)
- Multi-wire proportional drift chamber (1)
- Natural transformation (1)
- Neural network (1)
- Neutron star (1)
- Nonrandom connectivity (1)
- Nuclear astrophysics (1)
- Nuclear modification factor (1)
- Nuclear reactions (1)
- Nucleon induced nuclear reactions (1)
- Nucleosynthesis in explosive environments (1)
- Pb–Pb collisions (1)
- Physik (1)
- Pilus (1)
- Plates fractalization (1)
- Polarization (1)
- Potassium transport (1)
- Protonenplasmen (1)
- Pulsed epr (1)
- QCD-phase diagram (1)
- Quark deconfinement (1)
- Quark-gluon plasma (1)
- R value (1)
- RFQ (1)
- Radiative capture (1)
- Random graph model (1)
- Reconstructed jets (1)
- Relativistic Dissipative Hydrodynamics (1)
- Relativistic Heavy-ion Collisions (1)
- Relativistic heavy-ion collisions (1)
- SIS18 (1)
- Sachunterricht (1)
- Scale invariance (1)
- Schulbuchanalyse (1)
- Secondary beams (1)
- Secretin (1)
- Spin distribution and correlation (1)
- Statistical and Nonlinear Physics (1)
- Strahldynamik (1)
- Superconducting properties and materials (1)
- Surfaces, interfaces and thin films (1)
- TR (1)
- Techniques and instrumentation (1)
- Theoretical physics (1)
- Thermus thermophilus (1)
- Tracking (1)
- Transient & explosive astronomical phenomena (1)
- Transition Radiation Detector (1)
- Transition radiation detector (1)
- Transport model for heavy-ion collisions (1)
- Trigger (1)
- Triple quarkonia (1)
- Unparticles (1)
- Unstable nuclei induced nuclear reactions (1)
- Vesicle fusion (1)
- Vesicles (1)
- Vorticity (1)
- Xenon-based gas mixture (1)
- Y (4260) (1)
- a-induced reactions (1)
- activation (1)
- anisotropic azimuthal correlation (1)
- atomic physics (1)
- beam energy scan (1)
- black holes (1)
- bunch-to-bucket (1)
- central schemes (1)
- centrality dependence (1)
- charged kaon freeze-out (1)
- confinement (1)
- correlations (1)
- correlations and fluctuations (1)
- critical point (1)
- dE/dx (1)
- density (1)
- detectors (1)
- diphoton (1)
- directed flow (1)
- dissipative fluid dynamics (1)
- e+e− annihilation (1)
- effective temperature (1)
- electromagnetic orbital angular momentum (1)
- electromagnetic vorticity (1)
- electron (1)
- elliptic flow (1)
- energy system design (1)
- entropy limited hydrodynamics (1)
- field-effect transistors (1)
- first order phase transition (1)
- flow anisotropies (1)
- fluctuations (1)
- fluctuations and correlations (1)
- flux limiters (1)
- frequency beating (1)
- global jets (1)
- heat shock protein (1)
- heavy ion collisions (1)
- helical magnetic fields (1)
- high (1)
- hot spots (1)
- initial state (1)
- injection (1)
- instabilities (1)
- ion (1)
- isospin asymmetric matter (1)
- kinetic instabilities (1)
- kink-like instability (1)
- large-scale integration of renewable power generation (1)
- luminosity (1)
- molecular modeling (1)
- near-field microscopy (1)
- net-proton fluctuations (1)
- next-to-leading order perturbative QCD calculations (1)
- numerical methods (1)
- operation (1)
- p-Linac (1)
- particle-in-cell simulations (1)
- phase shift (1)
- phase transition (1)
- plasmonics (1)
- polarization (1)
- polarized radiation (1)
- power transmission (1)
- protein coevolution (1)
- protein complex (1)
- proton flow (1)
- proton-proton (1)
- p¯ + 40Ar → 40 Cl + (1)
- quadrupole (1)
- quark deconfinement (1)
- quark-gluon plasma (1)
- recollimation shocks (1)
- relativistic heavy-ion collisions (1)
- relativistic hydrodynamics (1)
- relativistic jets (1)
- s-SNOM (1)
- saturation (1)
- simulation (1)
- simulations (1)
- soft photons (1)
- strangeness enhancement (1)
- string fragmentation (1)
- sub-threshold (1)
- subthreshold (1)
- surface plasmon polaritons (1)
- surface waves (1)
- synchronization two rings (1)
- synchrotron emission (1)
- terahertz (1)
- thermodynamics (1)
- thermoelectrics (1)
- transient interaction (1)
- transport theory (1)
- van der Waals (1)
- virtual photon emission (1)
- γ-spectroscopy (1)
- κ meson (1)
- φ feed-down (1)
Institut
- Physik (237) (entfernen)
The ALICE experiment has measured the inclusive J/ψ production in Pb-Pb collisions at sNN−−−√=2.76 TeV down to zero transverse momentum in the rapidity range 2.5<y<4. A suppression of the inclusive J/ψ yield in Pb-Pb is observed with respect to the one measured in pp collisions scaled by the number of binary nucleon-nucleon collisions. The nuclear modification factor, integrated over the 0-80% most central collisions, is 0.545±0.032(stat.)±0.083(syst.) and does not exhibit a significant dependence on the collision centrality. These features appear significantly different from measurements at lower collision energies. Models including J/ψ production from charm quarks in a deconfined partonic phase can describe our data.
We report the first observation of the decay Λ+c→Σ−π+π+π0, based on data obtained in e+e− annihilations with an integrated luminosity of 567~pb−1 at s√=4.6~GeV. The data were collected with the BESIII detector at the BEPCII storage rings. The absolute branching fraction B(Λ+c→Σ−π+π+π0) is determined to be (2.11±0.33(stat.)±0.14(syst.))%. In addition, an improved measurement of B(Λ+c→Σ−π+π+) is determined as (1.81±0.17(stat.)±0.09(syst.))%.
Measurements of cross section of e⁺e⁻ → pp¯π⁰ at center-of-mass energies between 4.008 and 4.600 GeV
(2017)
Based on e+e− annihilation data samples collected with the BESIII detector at the BEPCII collider at 13 center-of-mass energies from 4.008 to 4.600 GeV, measurements of the Born cross section of e+e− → pp¯π0 are performed. No significant resonant structure is observed in the measured energy dependence of the cross section. The upper limit on the Born cross section of e+e− → Y (4260) → pp¯π0 at the 90% C.L. is determined to be 0.01 pb. The upper limit on the ratio of the branching fractions B(Y (4260)→pp¯π0) B(Y (4260)→π+π− J/ψ) at the 90% C.L. is determined to be 0.02%.
Using data samples collected with the BESIII detector at the BEPCII collider at six center-of-mass energies between 4.008 and 4.600 GeV, we observe the processes e+e− → φφω and e+e− → φφφ. The Born cross sections are measured and the ratio of the cross sections σ(e+e− → φφω)/σ(e+e− → φφφ) is estimated to be 1.75 ± 0.22 ± 0.19 averaged over six energy points, where the first uncertainty is statistical and the second is systematic. The results represent first measurements of these interactions.
We report the first measurement of the absolute branching fraction for Λ+c→Λμ+νμ. This measurement is based on a sample of e+e− annihilation data at a center-of-mass energy of s√=4.6 GeV collected with the BESIII detector at the BEPCII storage rings. The sample corresponds to an integrated luminosity of 567 pb−1. The branching fraction is determined to be B(Λ+c→Λμ+νμ)=(3.49±0.46(stat)±0.27(syst))%. In addition, we calculate the ratio B(Λ+c→Λμ+νμ)/B(Λ+c→Λe+νe) to be 0.96±0.16(stat)±0.04(syst).
The decays of χc2→K+K−π0, KSK±π∓ and π+π−π0 are studied with the ψ(3686) data samples collected with the Beijing Spectrometer (BESIII). For the first time, the branching fractions of χc2→K∗K¯¯¯¯¯, χc2→a±2(1320)π∓/a02(1320)π0 and χc2→ρ(770)±π∓ are measured. Here K∗K¯¯¯¯¯ denotes both K∗±K∓ and K∗0K¯¯¯¯¯0+c.c., and K∗ denotes the resonances K∗(892), K∗2(1430) and K∗3(1780). The observations indicate a strong violation of the helicity selection rule in χc2 decays into vector and pseudoscalar meson pairs. The measured branching fractions of χc2→K∗(892)K¯¯¯¯¯ are more than 10 times larger than the upper limit of χc2→ρ(770)±π∓, which is so far the first direct observation of a significant U-spin symmetry breaking effect in charmonium decays.
The decays of χc2→K+K−π0, KSK±π∓ and π+π−π0 are studied with the ψ(3686) data samples collected with the Beijing Spectrometer (BESIII). For the first time, the branching fractions of χc2→K∗K¯¯¯¯¯, χc2→a±2(1320)π∓/a02(1320)π0 and χc2→ρ(770)±π∓ are measured. Here K∗K¯¯¯¯¯ denotes both K∗±K∓ and K∗0K¯¯¯¯¯0+c.c., and K∗ denotes the resonances K∗(892), K∗2(1430) and K∗3(1780). The observations indicate a strong violation of the helicity selection rule in χc2 decays into vector and pseudoscalar meson pairs. The measured branching fractions of χc2→K∗(892)K¯¯¯¯¯ are more than 10 times larger than the upper limit of χc2→ρ(770)±π∓, which is so far the first direct observation of a significant U-spin symmetry breaking effect in charmonium decays.
We study the decays of J/ψ and ψ(3686) to the final states Σ(1385)0Σ¯(1385)0 and Ξ0Ξ¯0 based on a single baryon tag method using data samples of (1310.6±7.0)×106 J/ψ and (447.9±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider. The decays to Σ(1385)0Σ¯(1385)0 are observed for the first time. The measured branching fractions of J/ψ and ψ(3686)→Ξ0Ξ¯0 are in good agreement with, and much more precise, than the previously published results. The angular parameters for these decays are also measured for the first time. The measured angular decay parameter for J/ψ→Σ(1385)0Σ¯(1385)0, α=−0.64±0.03±0.10, is found to be negative, different to the other decay processes in this measurement. In addition, the "12\% rule" and isospin symmetry in the J/ψ and ψ(3686)→ΞΞ¯ and Σ(1385)Σ¯(1385) systems are tested.
By analyzing the large-angle Bhabha scattering events e+e− → (γ)e+e− and diphoton events e+e− → (γ)γγ for the data sets collected at center-of-mass (c.m.) energies between 2.2324 and 4.5900 GeV (131 energy points in total) with the upgraded Beijing Spectrometer (BESIII) at the Beijing Electron-Positron Collider (BEPCII), the integrated luminosities have been measured at the different c.m. energies, individually. The results are important inputs for the R value and J/ψ resonance parameter measurements.
Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe
(2017)
We use angle-resolved photo-emission spectroscopy (ARPES) to explore the electronic structure of single crystals of FeSe over a wide range of binding energies and study the effects of strong electron-electron correlations. We provide evidence for the existence of "Hubbard-like bands" at high binding energies consisting of incoherent many-body excitations originating from Fe 3d states in addition to the renormalized quasiparticle bands near the Fermi level. Many high energy features of the observed ARPES data can be accounted for when incorporating effects of strong local Coulomb interactions in calculations of the spectral function via dynamical mean-field theory, including the formation of a Hubbard-like band. This shows that over the energy scale of several eV, local correlations arising from the on-site Coulomb repulsion and Hund's coupling are essential for a proper understanding of the electronic structure of FeSe and other related iron based superconductors.