Refine
Year of publication
Document Type
- Preprint (684)
- Article (403)
- Working Paper (2)
Language
- English (1089)
Has Fulltext
- yes (1089)
Is part of the Bibliography
- no (1089)
Keywords
- Heavy Ion Experiments (21)
- Hadron-Hadron scattering (experiments) (11)
- Hadron-Hadron Scattering (10)
- Heavy-ion collision (6)
- Collective Flow (4)
- Elastic scattering (3)
- Heavy Quark Production (3)
- Charm physics (2)
- Collectivity (2)
- Comorbidities (2)
- Correlation (2)
- Diffraction (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Heavy Ions (2)
- Jets (2)
- Jets and Jet Substructure (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Particle Correlations and Fluctuations (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- Polarization (2)
- QCD (2)
- Quark-Gluon Plasma (2)
- RHIC (2)
- Shear viscosity (2)
- ABC Transporter (1)
- ALICE detector (1)
- Active middle ear implants (1)
- Animal models (1)
- Anti-nuclei (1)
- Antigen Processing (1)
- Attention-deficit/hyperactivity disorder (1)
- Auditory system (1)
- B-slope (1)
- Behavioral tests (1)
- Biodiversity (1)
- Bone conduction devices (1)
- Boosted Jets (1)
- Cardiomyocyte signaling pathways (1)
- Cardioprotection (1)
- Cardiovascular disease (1)
- Cellular Immune Response (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charged-particle multiplicity (1)
- Charm quark spatial diffusion coefficient (1)
- Charmonia (1)
- ClpB (1)
- Coalescence (1)
- Cold nuclear matter effects (1)
- Collective Flow, (1)
- Consensus statement (1)
- Critical point (1)
- Data management (1)
- Data sharing (1)
- Deuteron production (1)
- Di-hadron correlations (1)
- Drug targeting (1)
- EBV (1)
- ERAL1 (1)
- Ecosystems (1)
- Ed Diener (1)
- Electron-pion identification (1)
- Electroweak interaction (1)
- Elliptic flow (1)
- Endothelial permeability (1)
- Environment (1)
- Epigenetics (1)
- Extracellular RNA (eRNA) (1)
- Fibre/foam sandwich radiator (1)
- Flow (1)
- Fruit fly (1)
- Gene (1)
- Genetics (1)
- Get Pathway (1)
- Groomed jet radius (1)
- HARS2 (1)
- Hadron-hadron interactions (1)
- Hadronization (1)
- Hard Scattering (1)
- Health policy (1)
- Heart regeneration (1)
- Heavy ion collisions (1)
- Heavy ions (1)
- Heavy-Ion Collision (1)
- Heavy-flavor decay electron (1)
- Heavy-ion (1)
- Heavy-ion collisions (1)
- Higher moments (1)
- Induced pluripotent stem cells (1)
- Interference fragmentation function (1)
- Intracellular Trafficking (1)
- Invariant Mass Distribution (1)
- Ionisation energy loss (1)
- Ischemia–reperfusion injury (1)
- J/ψ suppression (1)
- Jet Physics (1)
- Jet Substructure (1)
- Jet substructure (1)
- KCGS (1)
- LARS2 (1)
- LHC (1)
- LTER (1)
- Lipid metabolism (1)
- Long‐term ecosystem research (1)
- Material budget (1)
- MicroRNAs (miRNAs) (1)
- Minimum Bias (1)
- Mitochondria (1)
- Mixed hearing loss (1)
- Monte Carlo (1)
- Mouse (1)
- Multi-Parton Interactions (1)
- Multi-stakeholder approach (1)
- Multi-wire proportional drift chamber (1)
- Multiple parton interactions (1)
- Net-charge correlations (1)
- Net-charge fluctuations (1)
- Neural network (1)
- Nonflow (1)
- Observation (1)
- Parkinson’s disease (1)
- Particle and Resonance Production (1)
- Pb–Pb collisions (1)
- Production Cross Section (1)
- Proton-proton collisions (1)
- Proton–proton collisions (1)
- Psychiatric traits (1)
- Quark Deconfinement (1)
- Quark Gluon Plasma (1)
- Quark gluon plasma (1)
- Quarkonium (1)
- Rapidity Range (1)
- Rehabilitation (1)
- Relativistic heavy ion physics (1)
- Relativistic heavy-ion collisions (1)
- Remote ischemic conditioning (1)
- Research infrastructure (1)
- Resolution Parameter (1)
- Rodents (1)
- STAR (1)
- Site networks (1)
- Socio-ecology (1)
- SoftDrop (1)
- Spin alignment (1)
- Splitting function (1)
- Surgery (1)
- Systematic Uncertainty (1)
- TR (1)
- TWNK (1)
- Tail-anchored Proteins (1)
- Technical data (1)
- Thermal model (1)
- Time Projection Chamber (1)
- Tracking (1)
- Transition radiation detector (1)
- Transversity (1)
- Trigger (1)
- Viral Immunology (1)
- Xenon-based gas mixture (1)
- Zebrafish (1)
- acute‐on‐chronic liver failure (1)
- alleles (1)
- antilocality (1)
- ataxia (1)
- autism spectrum disorder (1)
- autistic disorder (1)
- biogeographic legaciese (1)
- chemogenomic set (1)
- circulation (1)
- cirrhosis (1)
- color vision (1)
- contextual modulation (1)
- copy number polymorphism (1)
- dE/dx (1)
- detector (1)
- drug discovery (1)
- druggable genome (1)
- efficient coding (1)
- experimental results (1)
- focus movement (1)
- forest classification (1)
- forest functional similarity (1)
- gamma oscillations (1)
- genes (1)
- genetics (1)
- genome (1)
- genotype (1)
- genotype determination (1)
- global change (1)
- habitat destruction (1)
- happiness (1)
- heavy ion experiments (1)
- hemodynamic (1)
- inflammation (1)
- kinase inhibitor (1)
- land use (1)
- leukodystrophy (1)
- life satisfaction (1)
- neuroscience (1)
- obituary (1)
- obituary announcement (1)
- p+p collisions (1)
- phenotype (1)
- phenotypic screening (1)
- phylogenetic community distance (1)
- positive psychology (1)
- predictive coding (1)
- protein kinase (1)
- quark gluon plasma (1)
- research article (1)
- resumptive pronouns (1)
- rhesus macaque (1)
- single nucleotide polymorphism (1)
- small molecules (1)
- subject-only resumption (1)
- subjective well-being (1)
- surround suppression (1)
- tropical forests (1)
- understudied kinase (1)
Institute
- Physik (1023)
- Frankfurt Institute for Advanced Studies (FIAS) (933)
- Informatik (863)
- Medizin (15)
- Geowissenschaften (4)
- Institut für Ökologie, Evolution und Diversität (4)
- Informatik und Mathematik (3)
- Biochemie und Chemie (2)
- Biodiversität und Klima Forschungszentrum (BiK-F) (2)
- Center for Financial Studies (CFS) (2)
Correction to: Nature https://doi.org/10.1038/s41586-020-3001-6Published online 09 December 2020
In Fig. 1c of this Article, owing to an error during the production process, the equation incorrectly began ‘C(k*, r*) = …’ instead of ‘C(k*) = …’. In addition, in affiliation 71 ‘Dipartimento di Fisica dell’Università degli studi di Bari Aldo Moro’ has been corrected to read ‘Dipartimento di Fisica dell’Università degli studi di Cagliari’. The original Article has been corrected online.
The polarization of inclusive J/ψ and Υ(1S) produced in Pb-Pb collisions at sNN−−−√=5.02 TeV at the LHC is measured with the ALICE detector. The study is carried out by reconstructing the quarkonium through its decay to muon pairs in the rapidity region 2.5<y<4 and measuring the polar and azimuthal angular distributions of the muons. The polarization parameters λθ, λϕ and λθϕ are measured in the helicity and Collins-Soper reference frames, in the transverse momentum interval 2<pT<10 GeV/c and pT<15 GeV/c for the J/ψ and Υ(1S), respectively. The polarization parameters for the J/ψ are found to be compatible with zero, within a maximum of about two standard deviations at low pT, for both reference frames and over the whole pT range. The values are compared with the corresponding results obtained for pp collisions at s√=7 and 8 TeV in a similar kinematic region by the ALICE and LHCb experiments. Although with much larger uncertainties, the polarization parameters for Υ(1S) production in Pb-Pb collisions are also consistent with zero.
The polarization of inclusive J/ψ and Υ(1S) produced in Pb-Pb collisions at sNN−−−√=5.02 TeV at the LHC is measured with the ALICE detector. The study is carried out by reconstructing the quarkonium through its decay to muon pairs in the rapidity region 2.5<y<4 and measuring the polar and azimuthal angular distributions of the muons. The polarization parameters λθ, λϕ and λθϕ are measured in the helicity and Collins-Soper reference frames, in the transverse momentum interval 2<pT<10 GeV/c and pT<15 GeV/c for the J/ψ and Υ(1S), respectively. The polarization parameters for the J/ψ are found to be compatible with zero, with a maximum deviation at low pT of about 2σ, for both reference frames and over the whole pT range. The values are compared with the corresponding results obtained for pp collisions at s√=7 and 8 TeV in a similar kinematic region by the ALICE and LHCb experiments. Although with much larger uncertainties, the polarization parameters for Υ(1S) production in Pb-Pb collisions are also consistent with zero.
The inclusive production of the J/ψ and ψ(2S) charmonium states is studied as a function of centrality in p-Pb collisions at a centre-of-mass energy per nucleon pair sNN−−−√=8.16 TeV at the LHC. The measurement is performed in the dimuon decay channel with the ALICE apparatus in the centre-of-mass rapidity intervals −4.46<ycms<−2.96 (Pb-going direction) and 2.03<ycms<3.53 (p-going direction), down to zero transverse momentum (pT). The J/ψ and ψ(2S) production cross sections are evaluated as a function of the collision centrality, estimated through the energy deposited in the zero degree calorimeter located in the Pb-going direction. The pT-differential J/ψ production cross section is measured at backward and forward rapidity for several centrality classes, together with the corresponding average ⟨pT⟩ and ⟨p2T⟩ values. The nuclear effects affecting the production of both charmonium states are studied using the nuclear modification factor. In the p-going direction, a suppression of the production of both charmonium states is observed, which seems to increase from peripheral to central collisions. In the Pb-going direction, however, the centrality dependence is different for the two states: the nuclear modification factor of the J/ψ increases from below unity in peripheral collisions to above unity in central collisions, while for the ψ(2S) it stays below or consistent with unity for all centralities with no significant centrality dependence. The results are compared with measurements in p-Pb collisions at sNN−−−√=5.02 TeV and no significant dependence on the energy of the collision is observed. Finally, the results are compared with theoretical models implementing various nuclear matter effects.
The multiplicity dependence of the pseudorapidity density of charged particles in proton-proton (pp) collisions at centre-of-mass energies s√ = 5.02, 7 and 13 TeV measured by ALICE is reported. The analysis relies on track segments measured in the midrapidity range (|η|<1.5). Results are presented for inelastic events having at least one charged particle produced in the pseudorapidity interval |η|<1 (INEL>0). The multiplicity dependence of the pseudorapidy density of charged particles is measured with mid and forward rapidity multiplicity estimators, the latter being less affected by autocorrelations. A detailed comparison with predictions from the PYTHIA 8 and EPOS LHC event generators is also presented. Both generators provide a good description of the data.
The multiplicity dependence of the pseudorapidity density of charged particles in proton-proton (pp) collisions at centre-of-mass energies s√ = 5.02, 7 and 13 TeV measured by ALICE is reported. The analysis relies on track segments measured in the midrapidity range (|η|<1.5). Results are presented for inelastic events having at least one charged particle produced in the pseudorapidity interval |η|<1 (INEL>0). The multiplicity dependence of the pseudorapidy density of charged particles is measured with mid and forward rapidity multiplicity estimators, the latter being less affected by autocorrelations. A detailed comparison with predictions from the PYTHIA 8 and EPOS LHC event generators is also presented. Both generators provide a good description of the data.
The inclusive J/ψ elliptic (v2) and triangular (v3) flow coefficients measured at forward rapidity (2.5 <y< 4) and the v2 measured at midrapidity (|y|< 0.9) in Pb-Pb collisions at sNN−−−√ = 5.02 TeV using the ALICE detector at the LHC are reported. The entire Pb-Pb data sample collected during Run 2 is employed, amounting to an integrated luminosity of 750 μb−1 at forward rapidity and 93 μb−1 at midrapidity. The results are obtained using the scalar product method and are reported as a function of transverse momentum pT and collision centrality. At midrapidity, the J/ψ v2 is in agreement with the forward rapidity measurement. The centrality averaged results indicate a positive J/ψ v3 with a significance of more than 5σ at forward rapidity in the pT range 2<pT<5 GeV/c. The forward rapidity v2, v3, and v3/v2 results at low and intermediate pT (pT≲8 GeV/c) exhibit a mass hierarchy when compared to pions and D mesons, while converging into a species-independent curve at higher pT. At low and intermediate pT, the results could be interpreted in terms of a later thermalization of charm quarks compared to light quarks, while at high pT, path-length dependent effects seem to dominate. The J/ψ v2 measurements are further compared to a microscopic transport model calculation. Using a simplified extension of the quark scaling approach involving both light and charm quark flow components, it is shown that the D-meson vn measurements can be described based on those for charged pions and J/ψ flow.
The inclusive J/ψ elliptic (v2) and triangular (v3) flow coefficients measured at forward rapidity (2.5 <y< 4) and the v2 measured at midrapidity (|y|< 0.9) in Pb-Pb collisions at sNN−−−√ = 5.02 TeV using the ALICE detector at the LHC are reported. The entire Pb-Pb data sample collected during Run 2 is employed, amounting to an integrated luminosity of 750 μb−1 at forward rapidity and 93 μb−1 at midrapidity. The results are obtained using the scalar product method and are reported as a function of transverse momentum pT and collision centrality. At midrapidity, the J/ψ v2 is in agreement with the forward rapidity measurement. The centrality averaged results indicate a positive J/ψ v3 with a significance of more than 5σ at forward rapidity in the pT range 2<pT<5 GeV/c. The forward rapidity v2, v3, and v3/v2 results at low and intermediate pT (pT≲8 GeV/c) exhibit a mass hierarchy when compared to pions and D mesons, while converging into a species-independent curve at higher pT. At low and intermediate pT, the results could be interpreted in terms of a later thermalization of charm quarks compared to light quarks, while at high pT, path-length dependent effects seem to dominate. The J/ψ v2 measurements are further compared to a microscopic transport model calculation. Using a simplified extension of the quark scaling approach involving both light and charm quark flow components, it is shown that the D-meson vn measurements can be described based on those for charged pions and J/ψ flow.
A measurement of dielectron production in proton-proton (pp) collisions at s√=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron invariant mass mee and pair transverse momentum pT,ee that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of mee, pT,ee, and event multiplicity dNch/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π0 ratio in pp and proton-nucleus (p-A) collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15<mee<0.6 GeV/c2 and for pT,ee<0.4 GeV/c indicates an enhancement of soft dielectrons, reminiscent of the 'anomalous' soft-photon and -dilepton excess in hadron-hadron collisions reported by several experiments under different experimental conditions. The enhancement factor over the hadronic cocktail amounts to 1.61±0.13(stat.)±0.17(syst.,data)±0.34(syst.,cocktail) in the ALICE acceptance. Acceptance-corrected excess spectra in mee and pT,ee are extracted and compared with calculations of dielectron production from hadronic bremsstrahlung and thermal radiation within a hadronic many-body approach.
A measurement of dielectron production in proton-proton (pp) collisions at s√=13 TeV, recorded with the ALICE detector at the CERN LHC, is presented in this Letter. The data set was recorded with a reduced magnetic solenoid field. This enables the investigation of a kinematic domain at low dielectron invariant mass mee and pair transverse momentum pT,ee that was previously inaccessible at the LHC. The cross section for dielectron production is studied as a function of mee, pT,ee, and event multiplicity dNch/dη. The expected dielectron rate from hadron decays, called hadronic cocktail, utilizes a parametrization of the measured η/π0 ratio in pp and proton-nucleus (p-A) collisions, assuming that this ratio shows no strong dependence on collision energy at low transverse momentum. Comparison of the measured dielectron yield to the hadronic cocktail at 0.15<mee<0.6 GeV/c2 and for pT,ee<0.4 GeV/c indicates an enhancement of soft dielectrons, reminiscent of the 'anomalous' soft-photon and -dilepton excess in hadron-hadron collisions reported by several experiments under different experimental conditions. The enhancement factor over the hadronic cocktail amounts to 1.61±0.13(stat.)±0.17(syst.,data)±0.34(syst.,cocktail) in the ALICE acceptance. Acceptance-corrected excess spectra in mee and pT,ee are extracted and compared with calculations of dielectron production from hadronic bremsstrahlung and thermal radiation within a hadronic many-body approach.