Refine
Year of publication
Language
- English (170) (remove)
Has Fulltext
- yes (170)
Is part of the Bibliography
- no (170)
Keywords
- LHC (7)
- breast cancer (7)
- Mammakarzinom (6)
- Behandlung (4)
- Breast cancer (4)
- Metastasen (4)
- ALICE (3)
- ALICE experiment (3)
- CDK4/6 (3)
- Hadron-Hadron Scattering (3)
- PD1/PDL1 (3)
- Prävention (3)
- Studien (3)
- pp collisions (3)
- prevention (3)
- treatment (3)
- Beauty production (2)
- Clinical Trials and Observations (2)
- Radiotherapy (2)
- Risiko (2)
- Single electrons (2)
- lapatinib (2)
- lymphocytes (2)
- metastases (2)
- metastatic (2)
- neoadjuvant therapy (2)
- presenilin-1 (2)
- risk (2)
- trastuzumab (2)
- trials (2)
- 3′UTR length (1)
- 900 GeV (1)
- AD patients (1)
- APA (1)
- Acetogen (1)
- Acetogenesis (1)
- Advanced breast cancer (1)
- Alpelisib (1)
- Alzheimer's disease (1)
- Alzheimer’s disease (1)
- Anandamide (1)
- Animal models (1)
- Antihormone therapy (1)
- Artificial Intelligence (1)
- Atezolizumab (1)
- B cell malignancies (1)
- BCOR (1)
- BCORL1 (1)
- Biodiversity Data (1)
- Biomonitoring (1)
- Bone metastases (1)
- Borderline personality disorder (1)
- Botanical Collections (1)
- Brain metastasis (1)
- Brain tumors (1)
- C3M (1)
- C4M (1)
- CCL2 (1)
- CFIm (1)
- COVID (1)
- COVID-19 (1)
- CRISPR/Cas (1)
- CRM1 (1)
- CVID (1)
- Cancer (1)
- Cancer treatment (1)
- Central nervous system metastases (1)
- Charm physics (1)
- Childhood abuse (1)
- Children and adolescents (1)
- Chromatin (1)
- Clinical variation (1)
- Cold hardiness (1)
- Cold tolerance (1)
- Compact astrophysical objects (1)
- Comparison with QCD (1)
- Complex posttraumatic stress disorder (1)
- Compression stocking (1)
- Conservation (1)
- DNA damage (1)
- Deep vein thrombosis (1)
- Diagnostik (1)
- Dialectical behavioural therapy (1)
- Digitization (1)
- Distribution limits (1)
- E. coli (1)
- EGFR (1)
- EP300 (1)
- EWSR1 (1)
- Elderly (1)
- Emotion (1)
- European Society for Immunodeficiencies (ESID) (1)
- Exosomes (1)
- FIP1 (1)
- FOXO1 (1)
- Femtoscopy (1)
- First site of metastatic disease (1)
- Flightless-I (1)
- Frailty (1)
- Früherkennung (1)
- G-quadruplexes (1)
- Galaktografie (1)
- Galaktomosynthese (1)
- Galaxies and clusters (1)
- Gene fusion (1)
- Gene regulation (1)
- General practitioners (1)
- Genome editing (1)
- German PID-NET registry (1)
- Glutathione reductase (1)
- HBT (1)
- HDAC4 (1)
- HER2 c-erbB2 (1)
- HER2-positive (1)
- HER2/neu (1)
- HOX gene (1)
- Hadron production (1)
- Head and neck cancer (1)
- Heavy Ions (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ions (1)
- Heavy-flavour production (1)
- Heavy-ion collisions (1)
- Herbaria (1)
- Heregulin (1)
- High-energy astrophysics (1)
- Hypertension (1)
- IgG substitution therapy (1)
- Inclusive spectra (1)
- Inflammation (1)
- Intensity interferometry (1)
- Jets (1)
- KCGS (1)
- Katherine (1)
- Lesions (1)
- Leukemia (1)
- Lipid peroxidation (1)
- Lokalrezidiv (1)
- Lymphoid Neoplasia (1)
- MACE-seq (1)
- MEIS2 (1)
- MLL1/2 (1)
- MM-121 (1)
- MRI (1)
- MRT (1)
- Machine learning (1)
- Mamma (1)
- Mesenchymal stem cells (1)
- MetVF (1)
- Meta-analysis (1)
- Metastatic (1)
- Methylene-tetrahydrofolate reductase (1)
- MicroRNAs (1)
- Mid-rapidity (1)
- Molecular subtypes (1)
- Multi-strange baryons (1)
- Myeloid Neoplasia (1)
- NCoR1 (1)
- NMR spectroscopy (1)
- Nachsorge (1)
- Nanoscale materials (1)
- Necrosis (1)
- Neoadjuvant therapy (1)
- Neural signature (1)
- Neuroepithelial tumor (1)
- Non-small cell lung cancer (1)
- Nuclear modification factor (1)
- Oldest-old (1)
- Overwintering (1)
- PARP (1)
- PBX1 (1)
- PD1/ PDL1 (1)
- PD‑L1 (1)
- PI3K (1)
- PID prevalence (1)
- PLAGL1 (1)
- PYTHIA (1)
- Pathological complete response (1)
- Patient reported outcomes (1)
- Patterns of care (1)
- Pb–Pb (1)
- Phenotypic plasticity (1)
- Post-traumatic stress disorder (1)
- Presenilin (1)
- Prognosefaktoren (1)
- Proton–proton (1)
- Prädiktivfaktoren (1)
- Pulmonary embolism (1)
- RBC (1)
- Radiation Oncology (1)
- Randomised controlled trial (1)
- Reactive oxygen species (1)
- Real-time polymerase chain reaction (PCR) tests (1)
- Red blood cell transfusion (1)
- Relativistic heavy ion physics (1)
- Research Infrastructure (1)
- Richtlinie (1)
- SARS-CoV-2 testing (1)
- SILAC-based proteomics (1)
- SRSF3 (1)
- SRSF7 (1)
- Salivary gland carcinoma (1)
- Sarcomas (1)
- Semantics (1)
- Seribantumab (1)
- Single muons (1)
- Social participation (1)
- Stereotactic radiosurgery (1)
- Sub-zero exposure (1)
- Sumoylation (1)
- Superoxide dismutase (1)
- Supportivtherapie (1)
- Supratentorial (1)
- Surgery (1)
- T-DM1 (1)
- TALE-homdomain protein (1)
- TERRA RNA (1)
- TGFB-induced factor homeobox 1 (1)
- TGIF (1)
- TKI (1)
- Taxonomy (1)
- Tomosynthese (1)
- Toxicity (1)
- Transverse momentum (1)
- Triple negative (1)
- Tumor heterogeneity (1)
- T‑DM1 (1)
- Ultraschall (1)
- Venous thromboembolism (1)
- Winter survival (1)
- Wood-Ljungdahl pathway (1)
- X-ray diffraction (1)
- accident (1)
- acute coronary syndrome (1)
- acute myeloid leukaemia (1)
- acute myeloid leukemia (1)
- adjuvant therapy (1)
- adjuvante Therapie (1)
- advanced (1)
- advanced breast cancer (1)
- alpelisib (1)
- amino acids (1)
- amyloid precursor protein (APP) (1)
- anaemia (1)
- anti-neural autoantibodies (1)
- antibiotic therapy (1)
- antibodies (1)
- antihormone therapy (1)
- apoptosis (1)
- archeological modeling (1)
- ascites (1)
- at-risk mental state (1)
- atezolizumab (1)
- autoimmune encephalitis (1)
- autoimmune-mediated psychosis (1)
- b-cell lymphomas (1)
- bendamustine (1)
- biophysics (1)
- breast (1)
- calcium (1)
- cancer (1)
- cell biology (1)
- cell death (1)
- channelrhodopsin (1)
- chemogenomic set (1)
- chemotherapy (1)
- chemotherapy regimen (1)
- chimeric antigen receptor t-cell therapy (1)
- chimeric antigen receptors (1)
- clinical high at-risk mental state (1)
- collagen degradation marker (1)
- conformational changes (1)
- controlled nuclear import (1)
- copeptin (1)
- cytochrome c. (1)
- dPAS (1)
- diagnosis (1)
- diffusion-weighted magnetic resonance imaging (1)
- drug discovery (1)
- druggable genome (1)
- early breast cancer (1)
- elderly patients (1)
- electron cryo-microscopy (1)
- folding landscapes (1)
- follow‑up (1)
- fortgeschritten (1)
- frühes Mammakarzinom (1)
- galactography (1)
- galactomosynthesis (1)
- guideline (1)
- head and neck cancer (1)
- healthy control (1)
- hematopoietic stem cell transplantation (1)
- human–environment interaction (1)
- iCLIP (1)
- image-based risk modelling (1)
- immune-checkpoint inhibition (1)
- induction chemotherapy (1)
- injury (1)
- kinase inhibitor (1)
- kinetically trapped state (1)
- kinetics (1)
- leukapheresis (1)
- light-gated ion channel (1)
- liver cirrhosis (1)
- local recurrence (1)
- lockdown (1)
- loss-of-function (1)
- lymphoma (1)
- mTOR (1)
- machine learning (1)
- metastasis (1)
- microbial rhodopsin (1)
- mortality (1)
- mouse (1)
- multidrug resistance (1)
- multiplexed immunofluorescence (1)
- myocardial infarction (1)
- neoadjuvant chemoradiotherapy (1)
- neoadjuvante Therapie (1)
- neurogenesis (1)
- neuroimaging (1)
- oocytes (1)
- open science (1)
- oral cavity cancer (1)
- oxidative stress (1)
- p63 (1)
- pPAS (1)
- paleoclimate modeling (1)
- paleoenvironment modeling (1)
- paleoenvironment reconstruction (1)
- pancreatic cancer (1)
- pediatric intensive care (1)
- personalised therapy (1)
- pertuzumab (1)
- phenotypic screening (1)
- posttranslational modification (1)
- predictive biomarker (1)
- predictive factors (1)
- primary immunodeficiency (PID) (1)
- prognostic factors (1)
- protein kinase (1)
- proteins (1)
- quality control (1)
- radiation oncology (1)
- radiomic (1)
- real-time NMR spectroscopy (1)
- registry (1)
- registry for primary immunodeficiency (1)
- risk stratification (1)
- rituximab (1)
- schizophrenia (1)
- screening (1)
- screening routine (1)
- small molecules (1)
- spectra (1)
- spring-loaded activation (1)
- stem cell niche (1)
- structural biolog (1)
- structure elucidation (1)
- studies (1)
- subventricular zone (1)
- supportive therapy (1)
- surgery (1)
- survival (1)
- targeted therapy (1)
- tomosynthesis (1)
- transfusion (1)
- transgenic mice (1)
- trauma (1)
- treatment/therapy (1)
- troponin (1)
- ultra-high risk for psychosis (1)
- ultrasound (1)
- understudied kinase (1)
- √sN N = 2.76 TeV (1)
Institute
- Physik (84)
- Frankfurt Institute for Advanced Studies (FIAS) (69)
- Informatik (68)
- Medizin (61)
- Biowissenschaften (6)
- Biochemie und Chemie (5)
- Georg-Speyer-Haus (5)
- Pharmazie (5)
- Geowissenschaften (4)
- Psychologie (3)
he first measurements of the invariant differential cross sections of inclusive π0 and η meson production at mid-rapidity in proton–proton collisions at s=0.9 TeV and s=7 TeV are reported. The π0 measurement covers the ranges 0.4<pT<7 GeV/c and 0.3<pT<25 GeV/c for these two energies, respectively. The production of η mesons was measured at s=√7 TeV in the range 0.4<pT<15 GeV/c. Next-to-Leading Order perturbative QCD calculations, which are consistent with the π0 spectrum at s=0.9 TeV, overestimate those of π0 and η mesons at s=√7 TeV, but agree with the measured η/π0 ratio at s=√7 TeV.
The ALICE Collaboration has measured inclusive J/ψ production in pp collisions at a center-of-mass energy √s=2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges |y|<0.9 and 2.5<y<4 and have been obtained by measuring the electron and muon pair decay channels, respectively. The integrated luminosities for the two channels are Linte=1.1 nb−1 and Lintμ=19.9 nb−1, and the corresponding signal statistics are NJ/ψe+e−=59±14 and NJ/ψμ+μ−=1364±53. We present dσJ/ψ/dy for the two rapidity regions under study and, for the forward-y range, d2σJ/ψ/dydpt in the transverse momentum domain 0<pt<8 GeV/c. The results are compared with previously published results at s=7 TeV and with theoretical calculations.
The ALICE experiment has measured low-mass dimuon production in pp collisions at √s=7 TeV in the dimuon rapidity region 2.5<y<4. The observed dimuon mass spectrum is described as a superposition of resonance decays (η,ρ,ω,η′,ϕ) into muons and semi-leptonic decays of charmed mesons. The measured production cross sections for ω and ϕ are σω(1<pt<5 GeV/c,2.5<y<4)=5.28±0.54(stat)±0.49(syst) mb and σϕ(1<pt<5 GeV/c,2.5<y<4)=0.940±0.084(stat)±0.076(syst) mb. The differential cross sections d2σ/dydpt are extracted as a function of pt for ω and ϕ. The ratio between the ρ and ω cross section is obtained. Results for the ϕ are compared with other measurements at the same energy and with predictions by models.
Identical neutral kaon pair correlations are measured in √s=7 TeV pp collisions in the ALICE experiment. One-dimensional Ks0Ks0 correlation functions in terms of the invariant momentum difference of kaon pairs are formed in two multiplicity and two transverse momentum ranges. The femtoscopic parameters for the radius and correlation strength of the kaon source are extracted. The fit includes quantum statistics and final-state interactions of the a0/f0 resonance. Ks0Ks0 correlations show an increase in radius for increasing multiplicity and a slight decrease in radius for increasing transverse mass, mT, as seen in ππ correlations in pp collisions and in heavy-ion collisions. Transverse mass scaling is observed between the Ks0Ks0 and ππ radii. Also, the first observation is made of the decay of the f2′(1525) meson into the Ks0Ks0 channel in pp collisions.
The elliptic, v2, triangular, v3, and quadrangular, v4, azimuthal anisotropic flow coefficients are measured for unidentified charged particles, pions, and (anti-)protons in Pb–Pb collisions at √sNN=2.76 TeV with the ALICE detector at the Large Hadron Collider. Results obtained with the event plane and four-particle cumulant methods are reported for the pseudo-rapidity range |η|<0.8 at different collision centralities and as a function of transverse momentum, pT, out to pT=20 GeV/c. The observed non-zero elliptic and triangular flow depends only weakly on transverse momentum for pT>8 GeV/c. The small pT dependence of the difference between elliptic flow results obtained from the event plane and four-particle cumulant methods suggests a common origin of flow fluctuations up to pT=8 GeV/c. The magnitude of the (anti-)proton elliptic and triangular flow is larger than that of pions out to at least pT=8 GeV/c indicating that the particle type dependence persists out to high pT.
The production cross section of electrons from semileptonic decays of beauty hadrons was measured at mid-rapidity (|y|<0.8) in the transverse momentum range 1<pT<8 GeV/c with the ALICE experiment at the CERN LHC in pp collisions at a center of mass energy √s=7 TeV using an integrated luminosity of 2.2 nb−1. Electrons from beauty hadron decays were selected based on the displacement of the decay vertex from the collision vertex. A perturbative QCD calculation agrees with the measurement within uncertainties. The data were extrapolated to the full phase space to determine the total cross section for the production of beauty quark–antiquark pairs.
Heavy flavour decay muon production at forward rapidity in proton–proton collisions at √s=7 TeV
(2012)
The production of muons from heavy flavour decays is measured at forward rapidity in proton–proton collisions at √s=7 TeV collected with the ALICE experiment at the LHC. The analysis is carried out on a data sample corresponding to an integrated luminosity Lint=16.5 nb−1. The transverse momentum and rapidity differential production cross sections of muons from heavy flavour decays are measured in the rapidity range 2.5<y<4, over the transverse momentum range 2<pt<12 GeV/c. The results are compared to predictions based on perturbative QCD calculations.
The inclusive transverse momentum (pT) distributions of primary charged particles are measured in the pseudo-rapidity range |η|<0.8 as a function of event centrality in Pb–Pb collisions at √sNN=2.76 TeV with ALICE at the LHC. The data are presented in the pT range 0.15<pT<50 GeV/c for nine centrality intervals from 70–80% to 0–5%. The results in Pb–Pb are presented in terms of the nuclear modification factor RAA using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-pT particles strongly depends on event centrality. The yield is most suppressed in central collisions (0–5%) with RAA≈0.13 at pT=6–7 GeV/c. Above pT=7 GeV/c, there is a significant rise in the nuclear modification factor, which reaches RAA≈0.4 for pT>30 GeV/c. In peripheral collisions (70–80%), only moderate suppression (RAA=0.6–0.7) and a weak pT dependence is observed. The measured nuclear modification factors are compared to other measurements and model calculations.
Harmonic decomposition of two particle angular correlations in Pb–Pb collisions at √sNN=2.76 TeV
(2012)
Angular correlations between unidentified charged trigger (t) and associated (a) particles are measured by the ALICE experiment in Pb–Pb collisions at √sNN=2.76 TeV for transverse momenta 0.25<pTt,a<15 GeV/c, where pTt>pTa. The shapes of the pair correlation distributions are studied in a variety of collision centrality classes between 0 and 50% of the total hadronic cross section for particles in the pseudorapidity interval |η|<1.0. Distributions in relative azimuth Δϕ≡ϕt−ϕa are analyzed for |Δη|≡|ηt−ηa|>0.8, and are referred to as “long-range correlations”. Fourier components VnΔ≡〈cos(nΔϕ)〉 are extracted from the long-range azimuthal correlation functions. If particle pairs are correlated to one another through their individual correlation to a common symmetry plane, then the pair anisotropy VnΔ(pTt,pTa) is fully described in terms of single-particle anisotropies vn(pT) as VnΔ(pTt,pTa)=vn(pTt)vn(pTa). This expectation is tested for 1⩽n⩽5 by applying a global fit of all VnΔ(pTt,pTa) to obtain the best values vn{GF}(pT). It is found that for 2⩽n⩽5, the fit agrees well with data up to pTa∼3–4 GeV/c, with a trend of increasing deviation as pTt and pTa are increased or as collisions become more peripheral. This suggests that no pair correlation harmonic can be described over the full 0.25<pT<15 GeV/c range using a single vn(pT) curve; such a description is however approximately possible for 2⩽n⩽5 when pTa<4 GeV/c. For the n=1 harmonic, however, a single v1(pT) curve is not obtained even within the reduced range pTa<4 GeV/c.
The ALICE Collaboration reports the measurement of the relative J/ψ yield as a function of charged particle pseudorapidity density dNch/dη in pp collisions at √s=7 TeV at the LHC. J/ψ particles are detected for pt>0, in the rapidity interval |y|<0.9 via decay into e+e−, and in the interval 2.5<y<4.0 via decay into μ+μ− pairs. An approximately linear increase of the J/ψ yields normalized to their event average (dNJ/ψ/dy)/〈dNJ/ψ/dy〉 with (dNch/dη)/〈dNch/dη〉 is observed in both rapidity ranges, where dNch/dη is measured within |η|<1 and pt>0. In the highest multiplicity interval with 〈dNch/dη(bin)〉=24.1, corresponding to four times the minimum bias multiplicity density, an enhancement relative to the minimum bias J/ψ yield by a factor of about 5 at 2.5<y<4 (8 at |y|<0.9) is observed.
A measurement of the multi-strange Ξ− and Ω− baryons and their antiparticles by the ALICE experiment at the CERN Large Hadron Collider (LHC) is presented for inelastic proton–proton collisions at a centre-of-mass energy of 7 TeV. The transverse momentum (pT) distributions were studied at mid-rapidity (|y|<0.5) in the range of 0.6<pT<8.5 GeV/c for Ξ− and Ξ¯+ baryons, and in the range of 0.8<pT<5 GeV/c for Ω− and Ω¯+. Baryons and antibaryons were measured as separate particles and we find that the baryon to antibaryon ratio of both particle species is consistent with unity over the entire range of the measurement. The statistical precision of the current data has allowed us to measure a difference between the mean pT of Ξ− (Ξ¯+) and Ω− (Ω¯+). Particle yields, mean pT, and the spectra in the intermediate pT range are not well described by the PYTHIA Perugia 2011 tune Monte Carlo event generator, which has been tuned to reproduce the early LHC data. The discrepancy is largest for Ω− (Ω¯+). This PYTHIA tune approaches the pT spectra of Ξ− and Ξ¯+ baryons below pT<0.85 GeV/c and describes the Ξ− and Ξ¯+ spectra above pT>6.0 GeV/c. We also illustrate the difference between the experimental data and model by comparing the corresponding ratios of (Ω−+Ω¯+)/(Ξ−+Ξ¯+) as a function of transverse mass.
The ALICE Zero Degree Calorimeter system (ZDC) is composed of two identical sets of calorimeters, placed at opposite sides with respect to the interaction point, 114 meters away from it, complemented by two small forward electromagnetic calorimeters (ZEM). Each set of detectors consists of a neutron (ZN) and a proton (ZP) ZDC. They are placed at zero degrees with respect to the LHC axis and allow to detect particles emitted close to beam direction, in particular neutrons and protons emerging from hadronic heavy-ion collisions (spectator nucleons) and those emitted from electromagnetic processes. For neutrons emitted by these two processes, the ZN calorimeters have nearly 100% acceptance.
During the √sNN = 2.76 TeV Pb-Pb data-taking, the ALICE Collaboration studied forward neutron emission with a dedicated trigger, requiring a minimum energy deposition in at least one of the two ZN. By exploiting also the information of the two ZEM calorimeters it has been possible to separate the contributions of electromagnetic and hadronic processes and to study single neutron vs. multiple neutron emission.
The measured cross sections of single and mutual electromagnetic dissociation of Pb nuclei at √sNN = 2.76 TeV, with neutron emission, are σsingle EMD = 187:4 ± 0.2 (stat.)−11.2+13.2 (syst.) b and σmutual EMD = 5.7 ± 0.1 (stat.) ±0.4 (syst.) b, respectively [1]. This is the first measurement of electromagnetic dissociation of 208Pb nuclei at the LHC energies, allowing a test of electromagnetic dissociation theory in a new energy regime. The experimental results are compared to the predictions from a relativistic electromagnetic dissociation model.
We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral PbPb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9<y<0.9 is dσψ(2S)coh/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34−0.07+0.08(stat+syst). The obtained results are compared to predictions from theoretical models.
Charged jet production cross sections in p–Pb collisions at √sNN=5.02 TeV measured with the ALICE detector at the LHC are presented. Using the anti-kT algorithm, jets have been reconstructed in the central rapidity region from charged particles with resolution parameters R=0.2 and R=0.4. The reconstructed jets have been corrected for detector effects and the underlying event background. To calculate the nuclear modification factor, RpPb, of charged jets in p–Pb collisions, a pp reference was constructed by scaling previously measured charged jet spectra at s=7 TeV. In the transverse momentum range 20≤pT,chjet≤120 GeV/c, RpPb is found to be consistent with unity, indicating the absence of strong nuclear matter effects on jet production. Major modifications to the radial jet structure are probed via the ratio of jet production cross sections reconstructed with the two different resolution parameters. This ratio is found to be similar to the measurement in pp collisions at √s=7 TeV and to the expectations from PYTHIA pp simulations and NLO pQCD calculations at √sNN=5.02 TeV.
We present results of a search for two hypothetical strange dibaryon states, i.e. the H-dibaryon and the possible Λn‾ bound state. The search is performed with the ALICE detector in central (0–10%) Pb–Pb collisions at √sNN=2.76 TeV, by invariant mass analysis in the decay modes Λn‾→d‾π+ and H-dibaryon →Λpπ−. No evidence for these bound states is observed. Upper limits are determined at 99% confidence level for a wide range of lifetimes and for the full range of branching ratios. The results are compared to thermal, coalescence and hybrid UrQMD model expectations, which describe correctly the production of other loosely bound states, like the deuteron and the hypertriton.
The ALICE Collaboration has made the first measurement at the LHC of J/ψ photoproduction in ultra-peripheral Pb–Pb collisions at sNN=2.76 TeV. The J/ψ is identified via its dimuon decay in the forward rapidity region with the muon spectrometer for events where the hadronic activity is required to be minimal. The analysis is based on an event sample corresponding to an integrated luminosity of about 55 μb−1. The cross section for coherent J/ψ production in the rapidity interval −3.6<y<−2.6 is measured to be dσJ/ψcoh/dy=1.00±0.18(stat)−0.26+0.24(syst) mb. The result is compared to theoretical models for coherent J/ψ production and found to be in good agreement with those models which include nuclear gluon shadowing.
We have has performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb-Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S) →l+l− and ψ(2S) → J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9<y<0.9 is dσcohψ(2S)/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34+0.08−0.07(stat+syst). The obtained results are compared to predictions from theoretical models.
We have has performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb-Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S) →l+l− and ψ(2S) → J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1. The cross section for coherent ψ(2S) production in the rapidity interval −0.9<y<0.9 is dσcohψ(2S)/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34+0.08−0.07(stat+syst). The obtained results are compared to predictions from theoretical models.
Long-range angular correlations on the near and away side in p–Pb collisions at √sNN=5.02 TeV
(2013)
Angular correlations between charged trigger and associated particles are measured by the ALICE detector in p–Pb collisions at a nucleon–nucleon centre-of-mass energy of 5.02 TeV for transverse momentum ranges within 0.5<pT,assoc<pT,trig<4 GeV/c. The correlations are measured over two units of pseudorapidity and full azimuthal angle in different intervals of event multiplicity, and expressed as associated yield per trigger particle. Two long-range ridge-like structures, one on the near side and one on the away side, are observed when the per-trigger yield obtained in low-multiplicity events is subtracted from the one in high-multiplicity events. The excess on the near-side is qualitatively similar to that recently reported by the CMS Collaboration, while the excess on the away-side is reported for the first time. The two-ridge structure projected onto azimuthal angle is quantified with the second and third Fourier coefficients as well as by near-side and away-side yields and widths. The yields on the near side and on the away side are equal within the uncertainties for all studied event multiplicity and pT bins, and the widths show no significant evolution with event multiplicity or pT. These findings suggest that the near-side ridge is accompanied by an essentially identical away-side ridge.