Refine
Year of publication
Document Type
- Preprint (683)
- Article (403)
- Working Paper (2)
Language
- English (1088)
Has Fulltext
- yes (1088)
Is part of the Bibliography
- no (1088)
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 (1022)
- Frankfurt Institute for Advanced Studies (FIAS) (932)
- Informatik (862)
- 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)
In quantum scattering processes between two particles, aspects characterizing the strong and Coulomb forces can be observed in kinematic distributions of the particle pairs. The sensitivity to the interaction potential reaches a maximum at low relative momentum and vanishing distance between the two particles. Ultrarelativistic heavy-ion collisions at the LHC provide an abundant source of many hadron species and can be employed as a measurement method of scattering parameters that is complementary to scattering experiments. This study confirms that momentum correlations of particles produced in Pb–Pb collisions at the LHC provide an accurate measurement of kaon–proton scattering parameters at low relative momentum, allowing precise access to the K−p→K−p process. This work also validates the femtoscopic measurement in ultrarelativistic heavy-ion collisions as an alternative to scattering experiments and a complementary tool to the study of exotic atoms with comparable precision. In this work, the first femtoscopic measurement of momentum correlations of K−p(K+p‾) and K+p(K−p‾) pairs in Pb–Pb collisions at centre-of-mass energy per nucleon pair of sNN=5.02 TeV registered by the ALICE experiment is reported. The components of the K−p complex scattering length are extracted and found to be ℜf0=−0.91±0.03(stat)−0.03+0.17(syst) and ℑf0=0.92±0.05(stat)−0.33+0.12(syst). The results are compared with chiral effective field theory predictions as well as with existing data from dedicated scattering and exotic kaonic atom experiments.
The inclusive J/ψ production has been studied in Pb–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 qualitatively describe the measurements, within uncertainties.
In ultraperipheral collisions (UPCs) of relativistic nuclei without overlap of nuclear densities, the two nuclei are excited by the Lorentz-contracted Coulomb fields of their collision partners. In these UPCs, the typical nuclear excitation energy is below a few tens of MeV, and a small number of nucleons are emitted in electromagnetic dissociation (EMD) of primary nuclei, in contrast to complete nuclear fragmentation in hadronic interactions. The cross sections of emission of given numbers of neutrons in UPCs of 208Pb nuclei at sNN−−−√=5.02 TeV were measured with the neutron zero degree calorimeters (ZDCs) of the ALICE detector at the LHC, exploiting a similar technique to that used in previous studies performed at sNN−−−√=2.76 TeV. In addition, the cross sections for the exclusive emission of one, two, three, four, and five forward neutrons in the EMD, not accompanied by the emission of forward protons, and thus mostly corresponding to the production of 207,206,205,204,203Pb, respectively, were measured for the first time. The predictions from the available models describe the measured cross sections well. These cross sections can be used for evaluating the impact of secondary nuclei on the LHC components, in particular, on superconducting magnets, and also provide useful input for the design of the Future Circular Collider (FCC-hh).
The production of prompt D0, Ds+, and Λc+ hadrons, and their ratios, Ds+/D0 and Λc+/D0, are measured in proton–proton collisions at √s=13 TeV at midrapidity (|y|<0.5) with the ALICE detector at the LHC. The measurements are performed as a function of the charm-hadron transverse momentum (pT) in intervals of charged-particle multiplicity, measured with two multiplicity estimators covering different pseudorapidity regions. While the strange to non-strange Ds+/D0 ratio indicates no significant multiplicity dependence, the baryon-to-meson pT-differential Λc+/D0 ratio shows a multiplicity-dependent enhancement, with a significance of 5.3σ for 1<pT<12 GeV/c, comparing the highest multiplicity interval with respect to the lowest one. The measurements are compared with a theoretical model that explains the multiplicity dependence by a canonical treatment of quantum charges in the statistical hadronisation approach, and with predictions from event generators that implement colour reconnection mechanisms beyond the leading colour approximation to model the hadronisation process. The Λc+/D0 ratios as a function of pT present a similar shape and magnitude as the Λ/KS0 ratios in comparable multiplicity intervals, suggesting a potential common mechanism for light- and charm-hadron formation, with analogous multiplicity dependence. The pT-integrated ratios, extrapolated down to pT=0, do not show a significant dependence on multiplicity within the uncertainties.
We present the first systematic comparison of the charged-particle pseudorapidity densities for three widely different collision systems, pp, pPb, and PbPb, at the top energy of the Large Hadron Collider (√sNN=5.02TeV) measured over a wide pseudorapidity range (−3.5<η<5), the widest possible among the four experiments at that facility. The systematic uncertainties are minimised since the measurements are recorded by the same experimental apparatus (ALICE). The distributions for pPb and PbPb collisions are determined as a function of the centrality of the collisions, while results from pp collisions are reported for inelastic events with at least one charged particle at midrapidity. The charged-particle pseudorapidity densities are, under simple and robust assumptions, transformed to charged-particle rapidity densities. This allows for the calculation and the presentation of the evolution of the width of the rapidity distributions and of a lower bound on the Bjorken energy density, as a function of the number of participants in all three collision systems. We find a decreasing width of the particle production, and roughly a smooth ten fold increase in the energy density, as the system size grows, which is consistent with a gradually higher dense phase of matter.
Correlations between moments of different flow coefficients are measured in Pb–Pb collisions at √sNN=5.02TeV recorded with the ALICE detector. These new measurements are based on multiparticle mixed harmonic cumulants calculated using charged particles in the pseudorapidity region |η| <0.8with the transverse momentum range 0.2 <pT<5.0GeV/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 v2and v3is 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 v2and v3to their corresponding initial anisotropy coefficients ε2and 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.
Measurement of anti-3He nuclei absorption in matter and impact on their propagation in the Galaxy
(2022)
In our Galaxy, light antinuclei composed of antiprotons and antineutrons can be produced through high-energy cosmic-ray collisions with the interstellar medium or could also originate from the annihilation of dark-matter particles that have not yet been discovered. On Earth, the only way to produce and study antinuclei with high precision is to create them at high-energy particle accelerators. Although the properties of elementary antiparticles have been studied in detail, the knowledge of the interaction of light antinuclei with matter is limited. We determine the disappearance probability of 3He when it encounters matter particles and annihilates or disintegrates within the ALICE detector at the Large Hadron Collider. We extract the inelastic interaction cross section, which is then used as an input to the calculations of the transparency of our Galaxy to the propagation of 3He stemming from dark-matter annihilation and cosmic-ray interactions within the interstellar medium. For a specifc dark-matter profle, we estimate a transparency of about 50%, whereas it varies with increasing 3He momentum from 25% to 90% for cosmic-ray sources. The results indicate that 3He nuclei can travel long distances in the Galaxy, and can be used to study cosmic-ray interactions and dark-matter annihilation.
In our Galaxy, light antinuclei composed of antiprotons and antineutrons can be produced through high-energy cosmic-ray collisions with the interstellar medium or could also originate from the annihilation of dark-matter particles that have not yet been discovered. On Earth, the only way to produce and study antinuclei with high precision is to create them at high-energy particle accelerators. Although the properties of elementary antiparticles have been studied in detail, the knowledge of the interaction of light antinuclei with matter is limited. We determine the disappearance probability of 3He¯¯¯¯¯¯ when it encounters matter particles and annihilates or disintegrates within the ALICE detector at the Large Hadron Collider. We extract the inelastic interaction cross section, which is then used as input to calculations of the transparency of our Galaxy to the propagation of 3He¯¯¯¯¯¯ stemming from dark-matter annihilation and cosmic-ray interactions within the interstellar medium. For a specific dark-matter profile, we estimate a transparency of about 50%, whereas it varies with increasing 3He¯¯¯¯¯¯ momentum from 25% to 90% for cosmic-ray sources. The results indicate that 3He¯¯¯¯¯¯ nuclei can travel long distances in the Galaxy, and can be used to study cosmic-ray interactions and dark-matter annihilation.
Antimatter particles such as positrons and antiprotons abound in the cosmos. Much less common are light antinuclei, composed of antiprotons and antineutrons, which can be produced in our galaxy via high-energy cosmic-ray collisions with the interstellar medium or could also originate from the annihilation of the still undiscovered dark-matter particles. On Earth, the only way to produce and study antinuclei with high precision is to create them at high-energy particle accelerators like the Large Hadron Collider (LHC). Though the properties of elementary antiparticles have been studied in detail, knowledge of the interaction of light antinuclei with matter is rather limited. This work focuses on the determination of the disappearance probability of \ahe\ when it encounters matter particles and annihilates or disintegrates. The material of the ALICE detector at the LHC serves as a target to extract the inelastic cross section for \ahe\ in the momentum range of 1.17≤p<10 GeV/c. This inelastic cross section is measured for the first time and is used as an essential input to calculations of the transparency of our galaxy to the propagation of 3He¯¯¯¯¯¯ stemming from dark-matter decays and cosmic-ray interactions within the interstellar medium. A transparency of about 50% is estimated using the GALPROP program for a specific dark-matter profile and a standard set of propagation parameters. For cosmic-ray sources, the obtained transparency with the same propagation scheme varies with increasing 3He¯¯¯¯¯¯ momentum from 25% to 90%. The absolute uncertainties associated to the 3He¯¯¯¯¯¯ inelastic cross section measurements are of the order of 10%−15%. The reported results indicate that 3He¯¯¯¯¯¯ nuclei can travel long distances in the galaxy, and can be used to study cosmic-ray interactions and dark-matter decays.
The ALICE Collaboration reports the first fully-corrected measurements of the N-subjettiness observable for track-based jets in heavy-ion collisions. This study is performed using data recorded in pp and Pb−Pb collisions at centre-of-mass energies of √s=7 TeV and √sNN=2.76\,TeV, respectively. In particular the ratio of 2-subjettiness to 1-subjettiness, τ2/τ1, which is sensitive to the rate of two-pronged jet substructure, is presented. Energy loss of jets traversing the strongly interacting medium in heavy-ion collisions is expected to change the rate of two-pronged substructure relative to vacuum. The results are presented for jets with a resolution parameter of R=0.4 and charged jet transverse momentum of 40≤pT,jet≤60 GeV/c, which constitute a larger jet resolution and lower jet transverse momentum interval than previous measurements in heavy-ion collisions. This has been achieved by utilising a semi-inclusive hadron-jet coincidence technique to suppress the larger jet combinatorial background in this kinematic region. No significant modification of the τ2/τ1 observable for track-based jets in Pb--Pb collisions is observed relative to vacuum PYTHIA6 and PYTHIA8 references at the same collision energy. The measurements of τ2/τ1, together with the splitting aperture angle ΔR, are also performed in pp collisions at √s=7 TeV for inclusive jets. These results are compared with PYTHIA calculations at √s=7 TeV, in order to validate the model as a vacuum reference for the Pb−Pb centre-of-mass energy. The PYTHIA references for τ2/τ1 are shifted to larger values compared to the measurement in pp collisions. This hints at a reduction in the rate of two-pronged jets in Pb--Pb collisions compared to pp collisions.