Refine
Year of publication
Document Type
- Preprint (523)
- Article (323)
- Doctoral Thesis (1)
- Working Paper (1)
Language
- English (848)
Has Fulltext
- yes (848)
Is part of the Bibliography
- no (848)
Keywords
- Heavy Ion Experiments (20)
- Hadron-Hadron scattering (experiments) (11)
- Hadron-Hadron Scattering (6)
- Heavy-ion collision (5)
- Quark-Gluon Plasma (4)
- Collective Flow (3)
- Jets and Jet Substructure (3)
- Bone density (2)
- COVID-19 (2)
- Experimental nuclear physics (2)
- Experimental particle physics (2)
- Heavy Quark Production (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Osteoporosis (2)
- Particle Correlations and Fluctuations (2)
- Particle and resonance production (2)
- Particle correlations and fluctuations (2)
- QCD (2)
- Spine (2)
- ALICE detector (1)
- Angiography (1)
- Antarctica (1)
- Anti-nuclei (1)
- Atherosclerosis (1)
- Atmospheric science (1)
- BCL2 (1)
- BCR-ABL (1)
- Biomarker (1)
- Bone diseases, Metabolic (1)
- Boosted Jets (1)
- CT (1)
- CT dual-energy computed tomography (1)
- CXCR4 (1)
- CaMPARI (1)
- Cancer genetics (1)
- Cancer models (1)
- Cardiovascular diseases (1)
- Climate change (1)
- Computed tomography, X-ray (1)
- Contrast agent (1)
- Data sharing (1)
- Diagnostic imaging (1)
- Dual-energy computed tomography (1)
- Electron-pion identification (1)
- Electroweak interaction (1)
- Fibre/foam sandwich radiator (1)
- Germany (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hard Scattering (1)
- Head and neck cancer (1)
- Health risk analysis (1)
- Heavy Ion Experiment (1)
- Heavy Ions (1)
- Heavy ion storage ring (1)
- Herniated disk (1)
- Image processing (1)
- In-TIPS thrombosis (1)
- Intervertebral disc displacement (1)
- Ionisation energy loss (1)
- Italy (1)
- Jet Physics (1)
- Jet Substructure (1)
- Jets (1)
- LHC (1)
- MRI (1)
- Magnetic resonance imaging (1)
- Material budget (1)
- Multi-Parton Interactions (1)
- Multi-wire proportional drift chamber (1)
- Myocardial infarction (1)
- Myocarditis (1)
- Neolithic (1)
- Neural network (1)
- Orbital electron capture (1)
- Osteoporotic fractures (1)
- Particle and Resonance Production (1)
- Pb–Pb collisions (1)
- Phantoms (imaging) (1)
- Positron emission tomography (1)
- Postoperative radiochemotherapy (1)
- Prognostic (1)
- Properties of Hadrons (1)
- Quantitative Imaging (1)
- Quark Deconfinement (1)
- Quark Gluon Plasma (1)
- Quark Production (1)
- Quark gluon plasma (1)
- Quarkonium (1)
- Relativistic heavy-ion collisions (1)
- SARS-CoV-2 (1)
- SDF-1 (1)
- Single particle decay spectroscopy (1)
- Southern Ocean (1)
- Stroke (1)
- Sweden (1)
- TIPS (1)
- TR (1)
- Tomography (1)
- Tomography (x-ray computed) (1)
- Tracking (1)
- Transition radiation detector (1)
- Transjugular Intrahepatic Portosystemic Shunt (1)
- Trigger (1)
- Two body weak decay (1)
- Vaccination (1)
- Vasculitis (1)
- Vector Boson Production (1)
- Virtual noncalcium reconstructions (1)
- X-ray computed (1)
- Xenon-based gas mixture (1)
- activation receptors (1)
- acute lymphoblastic leukaemia (1)
- aging (1)
- alleles (1)
- articular chondrocytes (1)
- autism spectrum disorder (1)
- autistic disorder (1)
- benthos (1)
- biodiversity hotspots (1)
- biogeography (1)
- cancer (1)
- community assembly (1)
- computer-assisted (1)
- congenic mice (1)
- conservation (1)
- copy number polymorphism (1)
- cytosolic free calcium (1)
- dE/dx (1)
- detector (1)
- diagnostic imaging (1)
- diversity metrics (1)
- domestication (1)
- ectosomes (1)
- evolution (1)
- evolutionary history (1)
- exosomes (1)
- experimental results (1)
- extracellular vesicles (1)
- fishing (1)
- gene flow (1)
- genes (1)
- genetics (1)
- genome (1)
- genotype (1)
- genotype determination (1)
- global change (1)
- gravity (1)
- guidelines (1)
- habitat destruction (1)
- heavy ion experiments (1)
- high throughput screening (1)
- inflammation (1)
- innate lymphoid cells (1)
- intracellular trafficking (1)
- land use (1)
- liver (1)
- lymphocyte (1)
- marine protected areas (1)
- mechanics (1)
- metabolic syndromes (1)
- miRNA-17–92 (1)
- microparticles (1)
- microvesicles (1)
- minimal information requirements (1)
- mounting (1)
- multidetector computed tomography (1)
- neurodegeneration (1)
- neutralizing antibodies (1)
- parabolic flight (1)
- phenotype (1)
- phylogenetic diversity (1)
- pig (1)
- polytrauma (1)
- porcine (1)
- portal vein (1)
- prioritization (1)
- quark gluon plasma (1)
- range size (1)
- regulatory T cell (1)
- reproducibility (1)
- rigor (1)
- shroom (1)
- single nucleotide polymorphism (1)
- spike protein (1)
- standardization (1)
- thrombosis (1)
- variants of concern (1)
- vulnerable marine ecosystems (1)
- zebrafish (1)
Institute
- Physik (810)
- Frankfurt Institute for Advanced Studies (FIAS) (725)
- Informatik (693)
- Medizin (25)
- Geowissenschaften (4)
- Biowissenschaften (3)
- Georg-Speyer-Haus (3)
- Informatik und Mathematik (3)
- Biodiversität und Klima Forschungszentrum (BiK-F) (2)
- Buchmann Institut für Molekulare Lebenswissenschaften (BMLS) (2)
First measurement of 𝚲+c production down to 𝑝T = 0 in pp and p–Pb collisions at √𝑠NN = 5.02 TeV
(2023)
The production of prompt Λ+c baryons has been measured at midrapidity in the transverse momentum interval 0<pT<1 GeV/c for the first time, in pp and p-Pb collisions at a centre-of-mass energy per nucleon-nucleon collision sNN−−−√=5.02 TeV. The measurement was performed in the decay channel Λ+c→pK0S by applying new decay reconstruction techniques using a Kalman-Filter vertexing algorithm and adopting a machine-learning approach for the candidate selection. The pT-integrated Λ+c production cross sections in both collision systems were determined and used along with the measured yields in Pb-Pb collisions to compute the pT-integrated nuclear modification factors RpPb and RAA of Λ+c baryons, which are compared to model calculations that consider nuclear modification of the parton distribution functions. The Λ+c/D0 baryon-to-meson yield ratio is reported for pp and p-Pb collisions. Comparisons with models that include modified hadronisation processes are presented, and the implications of the results on the understanding of charm hadronisation in hadronic collisions are discussed. A significant (3.7σ) modification of the mean transverse momentum of Λ+c baryons is seen in p-Pb collisions with respect to pp collisions, while the pT-integrated Λ+c/D0 yield ratio was found to be consistent between the two collision systems within the uncertainties.
First measurement of 𝚲+c production down to 𝑝T = 0 in pp and p–Pb collisions at √𝑠NN = 5.02 TeV
(2023)
The production of prompt Λ+c baryons has been measured at midrapidity in the transverse momentum interval 0<pT<1 GeV/c for the first time, in pp and p-Pb collisions at a centre-of-mass energy per nucleon-nucleon collision sNN−−−√=5.02 TeV. The measurement was performed in the decay channel Λ+c→pK0S by applying new decay reconstruction techniques using a Kalman-Filter vertexing algorithm and adopting a machine-learning approach for the candidate selection. The pT-integrated Λ+c production cross sections in both collision systems were determined and used along with the measured yields in Pb-Pb collisions to compute the pT-integrated nuclear modification factors RpPb and RAA of Λ+c baryons, which are compared to model calculations that consider nuclear modification of the parton distribution functions. The Λ+c/D0 baryon-to-meson yield ratio is reported for pp and p-Pb collisions. Comparisons with models that include modified hadronisation processes are presented, and the implications of the results on the understanding of charm hadronisation in hadronic collisions are discussed. A significant (3.7σ) modification of the mean transverse momentum of Λ+c baryons is seen in p-Pb collisions with respect to pp collisions, while the pT-integrated Λ+c/D0 yield ratio was found to be consistent between the two collision systems within the uncertainties.
Fluctuation measurements are important sources of information on the mechanism of particle production at LHC energies. This article reports the first experimental results on third-order cumulants of the net-proton distributions in Pb–Pb collisions at a center-of-mass energy √sNN=5.02 TeV recorded by the ALICE detector. The results on the second-order cumulants of net-proton distributions at √sNN=2.76 and 5.02 TeV are also discussed in view of effects due to the global and local baryon number conservation. The results demonstrate the presence of long-range rapidity correlations between protons and antiprotons. Such correlations originate from the early phase of the collision. The experimental results are compared with HIJING and EPOS model calculations, and the dependence of the fluctuation measurements on the phase-space coverage is examined in the context of lattice quantum chromodynamics (LQCD) and hadron resonance gas (HRG) model estimations. The measured third-order cumulants are consistent with zero within experimental uncertainties of about 4% and are described well by LQCD and HRG predictions.
An excess of J/ψ yield at very low transverse momentum (pT<0.3 GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb−Pb collisions at a center-of-mass energy per nucleon pair of sNN−−−√=5.02 TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5<y<4). The nuclear modification factor at very low pT and the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at sNN−−−√=2.76 TeV, confirming the clear excess over hadronic production in the pT range 0−0.3 GeV/c and the centrality range 70−90%, and establishing an excess with a significance greater than 5σ also in the 50−70% and 30−50% centrality ranges. The results are compared with earlier measurements at sNN−−−√=2.76 TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.
An excess of J/ψ yield at very low transverse momentum (pT<0.3 GeV/c), originating from coherent photoproduction, is observed in peripheral and semicentral hadronic Pb–Pb collisions at a center-of-mass energy per nucleon pair of sNN=5.02 TeV. The measurement is performed with the ALICE detector via the dimuon decay channel at forward rapidity (2.5<y<4). The nuclear modification factor at very low pT and the coherent photoproduction cross section are measured as a function of centrality down to the 10% most central collisions. These results extend the previous study at sNN=2.76 TeV, confirming the clear excess over hadronic production in the pT range 0−0.3 GeV/c and the centrality range 70–90%, and establishing an excess with a significance greater than 5σ also in the 50–70% and 30–50% centrality ranges. The results are compared with earlier measurements at sNN=2.76 TeV and with different theoretical predictions aiming at describing how coherent photoproduction occurs in hadronic interactions with nuclear overlap.
The measurement of the production of f0(980) in inelastic pp collisions at √s=5.02 TeV is presented. This is the first reported measurement of inclusive f0(980) yield at LHC energies. The production is measured at midrapidity, |y|<0.5, in a wide transverse momentum range, 0<pT<16 GeV/c, by reconstructing the resonance in the f0(980) →π+π− hadronic decay channel using the ALICE detector. The pT-differential yields are compared to those of pions, protons and ϕ mesons as well as to predictions from the HERWIG 7.2 QCD-inspired Monte Carlo event generator and calculations from a coalescence model that uses the AMPT model as an input. The ratio of the pT-integrated yield of f0(980) relative to pions is compared to measurements in e+e− and pp collisions at lower energies and predictions from statistical hadronisation models and HERWIG 7.2. A mild collision energy dependence of the f0(980) to pion production is observed in pp collisions from SPS to LHC energies. All considered models underpredict the pT-integrated 2f0(980)/(π+ +π−) ratio. The prediction from the canonical statistical hadronisation model assuming a zero total strangeness content of f0(980) is consistent with the data within 1.9σ and is the closest to the data. The results provide an essential reference for future measurements of the particle yield and nuclear modification in p–Pb and Pb–Pb collisions, which have been proposed to be instrumental to probe the elusive nature and quark composition of the f0(980) scalar meson.
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.
The inclusive production of the charm-strange baryon Ω0c is measured for the first time via its hadronic decay into Ω−π+ at midrapidity (|y|<0.5) in proton-proton (pp) collisions at the centre-of-mass energy s√=13 TeV with the ALICE detector at the LHC. The transverse momentum (pT) differential cross section multiplied by the branching ratio is presented in the interval 2<pT<12 GeV/c. The pT dependence of the Ω0c-baryon production relative to the prompt D0-meson and to the prompt Ξ0c-baryon production is compared to various models that take different hadronisation mechanisms into consideration. In the measured pT interval, the ratio of the pT-integrated cross sections of Ω0c and prompt Λ+c baryons multiplied by the Ω−π+ branching ratio is found to be larger by a factor of about 20 with a significance of about 4σ when compared to e+e− collisions.
The first experimental information on the strong interaction between Λ and Ξ− strange baryons is presented in this Letter. The correlation function of Λ−Ξ− and Λ¯¯¯¯−Ξ¯¯¯¯+ pairs produced in high-multiplicity proton-proton (pp) collisions at s√ = 13 TeV at the LHC is measured as a function of the relative momentum of the pair. The femtoscopy method is used to calculate the correlation function, which is then compared with theoretical expectations obtained using a meson exchange model, chiral effective field theory, and Lattice QCD calculations close to the physical point. Data support predictions of small scattering parameters while discarding versions with large ones, thus suggesting a weak Λ−Ξ− interaction. The limited statistical significance of the data does not yet allow one to constrain the effects of coupled channels like Σ−Ξ and N−Ω.
The first experimental information on the strong interaction between Λ and Ξ− strange baryons is presented in this Letter. The correlation function of Λ−Ξ− and Λ¯¯¯¯−Ξ¯¯¯¯+ pairs produced in high-multiplicity proton-proton (pp) collisions at s√ = 13 TeV at the LHC is measured as a function of the relative momentum of the pair. The femtoscopy method is used to calculate the correlation function, which is then compared with theoretical expectations obtained using a meson exchange model, chiral effective field theory, and Lattice QCD calculations close to the physical point. Data support predictions of small scattering parameters while discarding versions with large ones, thus suggesting a weak Λ−Ξ− interaction. The limited statistical significance of the data does not yet allow one to constrain the effects of coupled channels like Σ−Ξ and N−Ω.