Refine
Year of publication
Document Type
- Article (248)
- Preprint (172)
- Conference Proceeding (2)
Has Fulltext
- yes (422)
Is part of the Bibliography
- no (422)
Keywords
- e +-e − Experiments (11)
- BESIII (10)
- Branching fraction (7)
- Particle and Resonance Production (6)
- Spectroscopy (5)
- Charm Physics (4)
- Heavy-ion collisions (4)
- Lepton colliders (4)
- Quarkonium (4)
- Charmed mesons (3)
- Diffraction (3)
- Elastic scattering (3)
- Electroweak interaction (3)
- Exotics (3)
- Hadronic decays (3)
- Polarization (3)
- e+-e− Experiments (3)
- Beam Energy Scan (2)
- Branching fractions (2)
- Charm physics (2)
- Chiral Magnetic Effect (2)
- Collectivity (2)
- Correlation (2)
- Electroweak Interaction (2)
- Leptonic, semileptonic & radiative decays (2)
- Particle decays (2)
- RHIC (2)
- STAR (2)
- Shear viscosity (2)
- Advanced biliary tract cancer (1)
- Artificial Intelligence (1)
- B-slope (1)
- BESIII detector (1)
- BI1361849 (1)
- BTC (1)
- Beam energy scan (1)
- Bhabha (1)
- Biodiversity Data (1)
- Biogeography (1)
- Biomarkers (1)
- Biomedical engineering (1)
- Biomonitoring (1)
- Bipolar disorder (1)
- Born cross section measurement (1)
- Botanical Collections (1)
- CAKUT (1)
- CBA (1)
- COVID 19 (1)
- COVID-19 (1)
- CP violation (1)
- CRVO (1)
- CV9202 (1)
- Cardiac implantable electronic devices (1)
- Cardiac rehabilitation (1)
- Cardiac resynchronization therapy (1)
- Cardiovascular disease risk (1)
- Cardiovascular diseases (1)
- Charged-particle multiplicity (1)
- Charm quark spatial diffusion coefficient (1)
- Charmonia (1)
- Charmonium (1)
- Charmonium (-like) (1)
- Chiral magnetic effect (1)
- Circadian (1)
- Clinical trial (1)
- Coalescence (1)
- Cold nuclear matter effects (1)
- Consensus document (1)
- Conservation (1)
- Critical point (1)
- Cross section (1)
- D meson (1)
- Dark photon (1)
- Dark sector (1)
- Data Standard (1)
- Data sharing (1)
- Deuteron production (1)
- Di-hadron correlations (1)
- Digital (1)
- Digitization (1)
- Ecology (1)
- Ecophysiology (1)
- Electromagnetic form factor (1)
- Electromagnetic form factors (1)
- Elliptic flow (1)
- Equity (1)
- Exercise training (1)
- Experimental nuclear physics (1)
- Experimental particle physics (1)
- FOS: Physical sciences (1)
- Flavor changing neutral currents (1)
- Flavor symmetries (1)
- Flavour Physics (1)
- Flow (1)
- Form factors (1)
- Forward physics (1)
- Genetics (1)
- Groomed jet radius (1)
- Hadron-Hadron scattering (experiments) (1)
- Hadronization (1)
- Hand-foot syndrome (1)
- Heart failure (1)
- Heavy Ion Experiments (1)
- Heavy Quark Production (1)
- Heavy ion collisions (1)
- Heavy-Ion Collision (1)
- Heavy-flavor decay electron (1)
- Heavy-ion (1)
- Herbaria (1)
- Hif1α (1)
- High Energy Physics - Experiment (hep-ex) (1)
- Higher moments (1)
- Hyperons (1)
- Hypertension (1)
- Hypofractionated radiotherapy (1)
- IHMCIF (1)
- IL-6 (1)
- Immunogenetics (1)
- Immunology (1)
- Immunomonitoring (1)
- Implantable cardioverter-defibrillator (1)
- Inclusive branching fraction (1)
- Inflammation (1)
- Initial state radiation (1)
- Integrative Modeling (1)
- Interference fragmentation function (1)
- Invisible decays (1)
- J/ψ suppression (1)
- Jet substructure (1)
- K0S (1)
- Lifestyle (1)
- MCP-1 (1)
- Multiple parton interactions (1)
- Multivariate analysis (1)
- NMR spectroscopy (1)
- Net-charge correlations (1)
- Net-charge fluctuations (1)
- Neutrinos (1)
- Non-small cell lung cancer (1)
- Nonflow (1)
- Open Access (1)
- PDB-Dev (1)
- PDBx/mmCIF (1)
- PDGFRβ (1)
- Pacemaker (1)
- Particle and resonance production (1)
- Particle phenomena (1)
- Patient safety (1)
- Physical activity (1)
- Poverty (1)
- Preclinical research (1)
- Prevention (1)
- Proton (1)
- Proton-proton collisions (1)
- Proton–proton collisions (1)
- Psychiatric disorders (1)
- Psychiatry (1)
- QCD (1)
- Quantum chromodynamics (1)
- Radiative decay (1)
- Rare decays (1)
- Research Infrastructure (1)
- SARS CoV 2 (1)
- SARS-CoV-2 (1)
- SD-OCT (1)
- SLC20A1 (1)
- Seasonal variation (1)
- Semantics (1)
- Semi-leptonic decays (1)
- Social determinants (1)
- SoftDrop (1)
- Solar insolation (1)
- Sorafenib (1)
- Spin alignment (1)
- Spine care (1)
- Splitting function (1)
- Standardization (1)
- Suicide (1)
- Sunlight (1)
- Taxonomy (1)
- Techniques Electromagnetic calorimeters (1)
- Thermal model (1)
- Transversity (1)
- VEGF (1)
- VEGFR-2 (1)
- VEGFR-3 (1)
- Vitreous samples (1)
- Worldwide Protein Data Bank (1)
- Y states (1)
- accessory proteins (1)
- bladder exstrophy-epispadias complex (1)
- c-kit (1)
- cell-free protein synthesis (1)
- center-of-mass energy (1)
- charmonium-like states (1)
- cloacal malformation (1)
- dimuon (1)
- e+e − annihilation (1)
- e+e⁻ − Experiments (1)
- e+e− Experiments (1)
- ectosomes (1)
- electron-positron collision (1)
- exosomes (1)
- extracellular vesicles (1)
- functional genetics (1)
- global change (1)
- guidelines (1)
- habitat destruction (1)
- hadron spectroscopy (1)
- hadronic events (1)
- heavy-ion collisions (1)
- helicity amplitude analysis (1)
- inclusive J/ψ decays (1)
- intrinsically disordered region (1)
- kidney formation (1)
- land use (1)
- mRNA active cancer immunotherapy (1)
- microparticles (1)
- microvesicles (1)
- minimal information requirements (1)
- nonstructural proteins (1)
- number of J/ψ events (1)
- p+p collisions (1)
- reproducibility (1)
- rigor (1)
- standardization (1)
- structural proteins (1)
- tetraquark (1)
- trigger efficiency (1)
- urinary tract development (1)
- wwPDB (1)
- zebrafish development (1)
- Λ+c baryon (1)
- Σ hyperon (1)
- Υ suppression (1)
- ψ(3686) (1)
Institute
- Physik (311)
- Frankfurt Institute for Advanced Studies (FIAS) (79)
- Medizin (13)
- Geowissenschaften (8)
- Biodiversität und Klima Forschungszentrum (BiK-F) (2)
- Biowissenschaften (2)
- Institut für Ökologie, Evolution und Diversität (2)
- Senckenbergische Naturforschende Gesellschaft (2)
- Biochemie und Chemie (1)
- Biochemie, Chemie und Pharmazie (1)
Understanding gluon density distributions and how they are modified in nuclei are among the most important goals in nuclear physics. In recent years, diffractive vector meson production measured in ultra-peripheral collisions (UPCs) at heavy-ion colliders has provided a new tool for probing the gluon density. In this Letter, we report the first measurement of J/ψ photoproduction off the deuteron in UPCs at the center-of-mass energy sNN−−−√=200 GeV in d+Au collisions. The differential cross section as a function of momentum transfer −t is measured. In addition, data with a neutron tagged in the deuteron-going Zero-Degree Calorimeter is investigated for the first time, which is found to be consistent with the expectation of incoherent diffractive scattering at low momentum transfer. Theoretical predictions based on the Color Glass Condensate saturation model and the gluon shadowing model are compared with the data quantitatively. A better agreement with the saturation model has been observed. With the current measurement, the results are found to be directly sensitive to the gluon density distribution of the deuteron and the deuteron breakup, which provides insights into the nuclear gluonic structure.
Understanding gluon density distributions and how they are modified in nuclei are among the most important goals in nuclear physics. In recent years, diffractive vector meson production measured in ultra-peripheral collisions (UPCs) at heavy-ion colliders has provided a new tool for probing the gluon density. In this Letter, we report the first measurement of J/ψ photoproduction off the deuteron in UPCs at the center-of-mass energy sNN−−−√=200 GeV in d+Au collisions. The differential cross section as a function of momentum transfer −t is measured. In addition, data with a neutron tagged in the deuteron-going Zero-Degree Calorimeter is investigated for the first time, which is found to be consistent with the expectation of incoherent diffractive scattering at low momentum transfer. Theoretical predictions based on the Color Glass Condensate saturation model and the gluon shadowing model are compared with the data quantitatively. A better agreement with the saturation model has been observed. With the current measurement, the results are found to be directly sensitive to the gluon density distribution of the deuteron and the deuteron breakup, which provides insights into the nuclear gluonic structure.
Elliptic flow of heavy-flavor decay electrons in Au+Au collisions at √sNN = 27 and 54.4 GeV at RHIC
(2023)
We report on new measurements of elliptic flow (v2) of electrons from heavy-flavor hadron decays at mid-rapidity (|y|<0.8) in Au+Au collisions at sNN−−−√ = 27 and 54.4 GeV from the STAR experiment. Heavy-flavor decay electrons (eHF) in Au+Au collisions at sNN−−−√ = 54.4 GeV exhibit a non-zero v2 in the transverse momentum (pT) region of pT< 2 GeV/c with the magnitude comparable to that at sNN−−−√=200 GeV. The measured eHF v2 at 54.4 GeV is also consistent with the expectation of their parent charm hadron v2 following number-of-constituent-quark scaling as other light and strange flavor hadrons at this energy. These suggest that charm quarks gain significant collectivity through the evolution of the QCD medium and may reach local thermal equilibrium in Au+Au collisions at sNN−−−√=54.4 GeV. The measured eHF v2 in Au+Au collisions at sNN−−−√= 27 GeV is consistent with zero within large uncertainties. The energy dependence of v2 for different flavor particles (π,ϕ,D0/eHF) shows an indication of quark mass hierarchy in reaching thermalization in high-energy nuclear collisions.
Elliptic flow measurements from two-, four- and six-particle correlations are used to investigate flow fluctuations in collisions of U+U at sNN−−−√= 193 GeV, Cu+Au at sNN−−−√= 200 GeV and Au+Au spanning the range sNN−−−√= 11.5 - 200 GeV. The measurements show a strong dependence of the flow fluctuations on collision centrality, a modest dependence on system size, and very little if any, dependence on particle species and beam energy. The results, when compared to similar LHC measurements, viscous hydrodynamic calculations, and T$\mathrel{\protect\raisebox{-2.1pt}{R}}$ENTo model eccentricities, indicate that initial-state-driven fluctuations predominate the flow fluctuations generated in the collisions studied.
In relativistic heavy-ion collisions, a global spin polarization, PH, of Λ and Λ¯ hyperons along the direction of the system angular momentum was discovered and measured across a broad range of collision energies and demonstrated a trend of increasing PH with decreasing sNN−−−√. A splitting between Λ and Λ¯ polarization may be possible due to their different magnetic moments in a late-stage magnetic field sustained by the quark-gluon plasma which is formed in the collision. The results presented in this study find no significant splitting at the collision energies of sNN−−−√=19.6 and 27 GeV in the RHIC Beam Energy Scan Phase II using the STAR detector, with an upper limit of PΛ¯−PΛ<0.24% and PΛ¯−PΛ<0.35%, respectively, at a 95% confidence level. We derive an upper limit on the naïve extraction of the late-stage magnetic field of B<9.4⋅1012 T and B<1.4⋅1013 T at sNN−−−√=19.6 and 27 GeV, respectively, although more thorough derivations are needed. Differential measurements of PH were performed with respect to collision centrality, transverse momentum, and rapidity. With our current acceptance of |y|<1 and uncertainties, we observe no dependence on transverse momentum and rapidity in this analysis. These results challenge multiple existing model calculations following a variety of different assumptions which have each predicted a strong dependence on rapidity in this collision-energy range.
We present the first measurements of transverse momentum spectra of π±, K±, p(p¯) at midrapidity (|y|<0.1) in U+U collisions at √sNN = 193 GeV with the STAR detector at the Relativistic Heavy Ion Collider (RHIC). The centrality dependence of particle yields, average transverse momenta, particle ratios and kinetic freeze-out parameters are discussed. The results are compared with the published results from Au+Au collisions at sNN−−−−√= 200 GeV in STAR. The results are also compared to those from A Multi Phase Transport (AMPT) model.
Measurement of cold nuclear matter effects for inclusive J/ψ in p+Au collisions at √sNN = 200 GeV
(2022)
Measurement by the STAR experiment at RHIC of the cold nuclear matter (CNM) effects experienced by inclusive J/ψ at mid-rapidity in 0-100% p+Au collisions at √sNN = 200 GeV is presented. Such effects are quantified utilizing the nuclear modification factor, RpAu, obtained by taking a ratio of J/ψ yield in p+Au collisions to that in p+p collisions scaled by the number of binary nucleon-nucleon collisions. The differential J/ψ yield in both p+p and p+Au collisions is measured through the dimuon decay channel, taking advantage of the trigger capability provided by the Muon Telescope Detector in the RHIC 2015 run. Consequently, the J/ψ RpAu is derived within the transverse momentum (pT) range of 0 to 10 GeV/c. A suppression of approximately 30% is observed for pT < 2 GeV/c, while J/ψ RpAu becomes compatible with unity for pT greater than 3 GeV/c, indicating the J/ψ yield is minimally affected by the CNM effects at high pT. Comparison to a similar measurement from 0-20% central Au+Au collisions reveals that the observed strong J/ψ suppression above 3 GeV/c is mostly due to the hot medium effects, providing strong evidence for the formation of the quark-gluon plasma in these collisions. Several model calculations show qualitative agreement with the measured J/ψ RpAu, while their agreement with the J/ψ yields in p+p and p+Au collisions is worse.
We report on the measurements of directed flow v1 and elliptic flow v2 for hadrons (π±, K ±, K0 S , p, φ, Λ and ) from Au+Au collisions at √sN N = 3 GeV and v2 for (π±, K ±, p and p) at 27 and 54.4 GeV with the STAR experiment. While at the two higher energy midcentral collisions the numberof-constituent-quark (NCQ) scaling holds, at 3 GeV the v2 at midrapidity is negative for all hadrons and the NCQ scaling is absent. In addition, the v1 slopes at midrapidity for almost all observed hadrons are found to be positive, implying dominant repulsive baryonic interactions. The features of negative v2 and positive v1 slope at 3 GeV can be reproduced with a baryonic mean-field in transport model calculations. These results imply that the medium in such collisions is likely characterized by baryonic interactions.
The inclusive J/ψ transverse momentum spectra and nuclear modification factors are reported at midrapidity (|y| < 1.0) in Au+Au collisions at √sN N = 39, 62.4 and 200 GeV taken by the STAR experiment. A suppression of J/ψ production, with respect to the production in p + p scaled by the number of binary nucleon–nucleon collisions, is observed in central Au+Au collisions at these three energies. No significant energy dependence of nuclear modification factors is found within uncertainties. The measured nuclear modification factors can be described by model calculations that take into account both suppression of direct J/ψ production due to the color screening effect and J/ψ regeneration from recombination of uncorrelated charm–anticharm quark pairs.
Fluctuations of conserved quantities such as baryon number, charge, and strangeness are sensitive to the correlation length of the hot and dense matter created in relativistic heavy-ion collisions and can be used to search for the QCD critical point. We report the first measurements of the moments of net-kaon multiplicity distributions in Au+Au collisions at √sNN = 7.7, 11.5, 14.5, 19.6, 27, 39, 62.4, and 200 GeV. The collision centrality and energy dependence of the mean (M), variance (σ 2), skewness (S), and kurtosis (κ) for net-kaon multiplicity distributions as well as the ratio σ 2/M and the products Sσ and κσ 2 are presented. Comparisons are made with Poisson and negative binomial baseline calculations as well as with UrQMD, a transport model (UrQMD) that does not include effects from the QCD critical point. Within current uncertainties, the net-kaon cumulant ratios appear to be monotonic as a function of collision energy.