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)
Higher harmonic flow coefficients of identified hadrons in Pb–Pb collisions at √sNN = 2.76 TeV
(2016)
The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p+p¯¯¯ in Pb-Pb collisions at sNN−−−√=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3<pT<6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT<3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.
Higher harmonic flow coefficients of identified hadrons in Pb–Pb collisions at √sNN = 2.76 TeV
(2016)
The elliptic, triangular, quadrangular and pentagonal anisotropic flow coefficients for π±, K± and p+p¯¯¯ in Pb-Pb collisions at sNN−−−√=2.76 TeV were measured with the ALICE detector at the Large Hadron Collider. The results were obtained with the Scalar Product method, correlating the identified hadrons with reference particles from a different pseudorapidity region. Effects not related to the common event symmetry planes (non-flow) were estimated using correlations in pp collisions and were subtracted from the measurement. The obtained flow coefficients exhibit a clear mass ordering for transverse momentum (pT) values below ≈ 3 GeV/c. In the intermediate pT region (3<pT<6 GeV/c), particles group at an approximate level according to the number of constituent quarks, suggesting that coalescence might be the relevant particle production mechanism in this region. The results for pT<3 GeV/c are described fairly well by a hydrodynamical model (iEBE-VISHNU) that uses initial conditions generated by A Multi-Phase Transport model (AMPT) and describes the expansion of the fireball using a value of 0.08 for the ratio of shear viscosity to entropy density (η/s), coupled to a hadronic cascade model (UrQMD). Finally, expectations from AMPT alone fail to quantitatively describe the measurements for all harmonics throughout the measured transverse momentum region. However, the comparison to the AMPT model highlights the importance of the late hadronic rescattering stage to the development of the observed mass ordering at low values of pT and of coalescence as a particle production mechanism for the particle type grouping at intermediate values of pT for all harmonics.
The inclusive J/ψ production has been studied in Pn-Pb and pp collisions at the centre-of-mass energy per nucleon pair sNN−−−√=5.02 TeV, using the ALICE detector at the CERN LHC. The J/ψ meson is reconstructed, in the centre-of-mass rapidity interval 2.5<y<4 and in the transverse-momentum range pT<12 GeV/c, via its decay to a muon pair. In this Letter, we present results on the inclusive J/ψ cross section in pp collisions at s√=5.02 TeV and on the nuclear modification factor RAA. The latter is presented as a function of the centrality of the collision and, for central collisions, as a function of the transverse momentum pT of the J/ψ. The measured RAA values indicate a suppression of the J/ψ in nuclear collisions and are then compared to our previous results obtained in Pb-Pb collisions at sNN−−−√=2.76 TeV. The ratio of the RAA values at the two energies is also computed and compared to calculations of statistical and dynamical models. The numerical value of the ratio for central events (0-10\% centrality) is 1.17±0.04(stat)±0.20(syst). In central events, as a function of pT, a slight increase of RAA with collision energy is visible in the region 2<pT<6 GeV/c. Theoretical calculations provide a good description of the measurements, within uncertainties.
The inclusive J/ψ production has been studied in Pn-Pb and pp collisions at the centre-of-mass energy per nucleon pair sNN−−−√=5.02 TeV, using the ALICE detector at the CERN LHC. The J/ψ meson is reconstructed, in the centre-of-mass rapidity interval 2.5<y<4 and in the transverse-momentum range pT<12 GeV/c, via its decay to a muon pair. In this Letter, we present results on the inclusive J/ψ cross section in pp collisions at s√=5.02 TeV and on the nuclear modification factor RAA. The latter is presented as a function of the centrality of the collision and, for central collisions, as a function of the transverse momentum pT of the J/ψ. The measured RAA values indicate a suppression of the J/ψ in nuclear collisions and are then compared to our previous results obtained in Pb-Pb collisions at sNN−−−√=2.76 TeV. The ratio of the RAA values at the two energies is also computed and compared to calculations of statistical and dynamical models. The numerical value of the ratio for central events (0-10\% centrality) is 1.17±0.04(stat)±0.20(syst). In central events, as a function of pT, a slight increase of RAA with collision energy is visible in the region 2<pT<6 GeV/c. Theoretical calculations provide a good description of the measurements, within uncertainties.
Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV
(2016)
We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta 8<ptrigT<16 GeV/c and associated charged particles of 0.5<passocT<10 GeV/c versus the azimuthal angle difference Δφ at midrapidity in pp and central Pb-Pb collisions at sNN−−−√=2.76 TeV with ALICE. The new measurements exploit associated charged hadrons down to 0.5 GeV/c, which significantly extends our previous measurement that only used charged hadrons above 3 GeV/c. After subtracting the contributions of the flow background, v2 to v5, the per-trigger yields are extracted for |Δφ|<0.7 on the near and for |Δφ−π|<1.1 on the away side. The ratio of per-trigger yields in Pb--Pb to those in pp collisions, IAA, is measured on the near and away side for the 0--10\% most central Pb--Pb collisions. On the away side, the per-trigger yields in Pb--Pb are strongly suppressed to the level of IAA≈0.6 for passocT>3 GeV/c, while with decreasing momenta an enhancement develops reaching about 5 at low passocT. On the near side, an enhancement of IAA between 1.2 at the highest to 1.8 at the lowest passocT is observed. The data are compared to parton-energy-loss predictions of the JEWEL and AMPT event generators, as well as to a perturbative QCD calculation with medium-modified fragmentation functions. All calculations qualitatively describe the away-side suppression at high passocT. Only AMPT captures the enhancement at low passocT, both on the near and away side. However, it also underpredicts IAA above 5 GeV/c, in particular on the near-side.
Jet-like correlations with neutral pion triggers in pp and central Pb–Pb collisions at 2.76 TeV
(2016)
We present measurements of two-particle correlations with neutral pion trigger particles of transverse momenta 8<ptrigT<16 GeV/c and associated charged particles of 0.5<passocT<10 GeV/c versus the azimuthal angle difference Δφ at midrapidity in pp and central Pb-Pb collisions at sNN−−−√=2.76 TeV with ALICE. The new measurements exploit associated charged hadrons down to 0.5 GeV/c, which significantly extends our previous measurement that only used charged hadrons above 3 GeV/c. After subtracting the contributions of the flow background, v2 to v5, the per-trigger yields are extracted for |Δφ|<0.7 on the near and for |Δφ−π|<1.1 on the away side. The ratio of per-trigger yields in Pb--Pb to those in pp collisions, IAA, is measured on the near and away side for the 0--10\% most central Pb--Pb collisions. On the away side, the per-trigger yields in Pb--Pb are strongly suppressed to the level of IAA≈0.6 for passocT>3 GeV/c, while with decreasing momenta an enhancement develops reaching about 5 at low passocT. On the near side, an enhancement of IAA between 1.2 at the highest to 1.8 at the lowest passocT is observed. The data are compared to parton-energy-loss predictions of the JEWEL and AMPT event generators, as well as to a perturbative QCD calculation with medium-modified fragmentation functions. All calculations qualitatively describe the away-side suppression at high passocT. Only AMPT captures the enhancement at low passocT, both on the near and away side. However, it also underpredicts IAA above 5 GeV/c, in particular on the near-side.
Correlations between moments of different flow coefficients are measured in Pb-Pb collisions at sNN−−−√=5.02 TeV recorded with the ALICE detector. These new measurements are based on multiparticle mixed harmonic cumulants calculated using charged particles in the pseudorapidity region |η|<0.8 with the transverse momentum range 0.2<pT<5.0 GeV/c. The centrality dependence of correlations between two flow coefficients as well as the correlations between three flow coefficients, both in terms of their second moments, are shown. In addition, a collection of mixed harmonic cumulants involving higher moments of v2 and v3 is measured for the first time, where the characteristic signature of negative, positive and negative signs of four-, six- and eight-particle cumulants are observed, respectively. The measurements are compared to the hydrodynamic calculations using iEBE-VISHNU with AMPT and TRENTo initial conditions. It is shown that the measurements carried out using the LHC Run 2 data in 2015 have the precision to explore the details of initial-state fluctuations and probe the nonlinear hydrodynamic response of v2 and v3 to their corresponding initial anisotropy coefficients ε2 and ε3. These new studies on correlations between three flow coefficients as well as correlations between higher moments of two different flow coefficients will pave the way to tighten constraints on initial-state models and help to extract precise information on the dynamic evolution of the hot and dense matter created in heavy-ion collisions at the LHC.
Correlations between moments of different flow coefficients are measured in Pb-Pb collisions at sNN−−−√=5.02 TeV recorded with the ALICE detector. These new measurements are based on multiparticle mixed harmonic cumulants calculated using charged particles in the pseudorapidity region |η|<0.8 with the transverse momentum range 0.2<pT<5.0 GeV/c. The centrality dependence of correlations between two flow coefficients as well as the correlations between three flow coefficients, both in terms of their second moments, are shown. In addition, a collection of mixed harmonic cumulants involving higher moments of v2 and v3 is measured for the first time, where the characteristic signature of negative, positive and negative signs of four-, six- and eight-particle cumulants are observed, respectively. The measurements are compared to the hydrodynamic calculations using iEBE-VISHNU with AMPT and TRENTo initial conditions. It is shown that the measurements carried out using the LHC Run 2 data in 2015 have the precision to explore the details of initial-state fluctuations and probe the nonlinear hydrodynamic response of v2 and v3 to their corresponding initial anisotropy coefficients ε2 and ε3. These new studies on correlations between three flow coefficients as well as correlations between higher moments of two different flow coefficients will pave the way to tighten constraints on initial-state models and help to extract precise information on the dynamic evolution of the hot and dense matter created in heavy-ion collisions at the LHC.
The production of Λ baryons and K0S mesons (V0 particles) was measured in p-Pb collisions at sNN−−−√=5 TeV and pp collisions at s√=7 TeV with ALICE at the LHC. The production of these strange particles is studied separately for particles associated with hard scatterings and the underlying event to shed light on the baryon-to-meson ratio enhancement observed at intermediate transverse momentum (pT) in high multiplicity pp and p-Pb collisions. Hard scatterings are selected on an event-by-event basis with jets reconstructed with the anti-kT algorithm using charged particles. The production of strange particles associated with jets pchT,jet>10 GeV/c is reported as a function of pT in both systems; and its dependence on pT with jets pchT,jet>20 GeV/c and on angular distance from the jet axis, R(V0,jet), for jets with pchT,jet>10 GeV/c are reported in p-Pb collisions. The results are compared with the strange particle production in the underlying event. The Λ/K0S ratio associated with jets in p-Pb collisions for R(V0,jet)<0.4 is consistent with the ratio measured in pp collisions and with the expectation of jets fragmenting in vacuum given by the PYTHIA event generator.
The production of Λ baryons and K0S mesons (V0 particles) was measured in p-Pb collisions at sNN−−−√=5.02 TeV and pp collisions at s√=7 TeV with ALICE at the LHC. The production of these strange particles is studied separately for particles associated with hard scatterings and the underlying event to shed light on the baryon-to-meson ratio enhancement observed at intermediate transverse momentum (pT) in high multiplicity pp and p-Pb collisions. Hard scatterings are selected on an event-by-event basis with jets reconstructed with the anti-kT algorithm using charged particles. The production of strange particles associated with jets pchT,jet>10 and pchT,jet>20 GeV/c in p-Pb collisions, and with jet pchT,jet>10 GeV/c in pp collisions is reported as a function of pT. Its dependence on angular distance from the jet axis, R(V0,jet), for jets with pchT,jet>10 GeV/c in p-Pb collisions is reported as well. The pT-differential production spectra of strange particles associated with jets are found to be harder compared to that in the underlying event and both differ from the inclusive measurements. In events containing a jet, the density of the V0 particles in the underlying event is found to be larger than the density in the minimum bias events. The Λ/K0S ratio associated with jets in p-Pb collisions is consistent with the ratio in pp collisions and follows the expectation of jets fragmenting in vacuum. On the other hand, this ratio within jets is consistently lower than the one obtained in the underlying event and it does not show the characteristic enhancement of baryons at intermediate pT often referred to as "baryon anomaly" in the inclusive measurements.