Refine
Year of publication
Document Type
- Article (411)
- Preprint (218)
- Contribution to a Periodical (8)
- Conference Proceeding (6)
- Working Paper (6)
- Book (1)
- Report (1)
Has Fulltext
- yes (651)
Is part of the Bibliography
- no (651)
Keywords
- e +-e − Experiments (12)
- BESIII (11)
- Branching fraction (8)
- Particle and Resonance Production (6)
- Charm Physics (5)
- Spectroscopy (5)
- Heavy-ion collisions (4)
- Lepton colliders (4)
- Quarkonium (4)
- portal hypertension (4)
- stochastic differential utility (4)
- COVID-19 (3)
- Charmed mesons (3)
- Diffraction (3)
- Elastic scattering (3)
- Electroweak interaction (3)
- Exotics (3)
- Hadronic decays (3)
- Polarization (3)
- e+-e− Experiments (3)
- Beam Energy Scan (2)
- Biomarkers (2)
- Branching fractions (2)
- Brassica napus (2)
- COVID-19 surveillance (2)
- Cancer (2)
- Charm physics (2)
- Charmonium (2)
- Chiral Magnetic Effect (2)
- Collectivity (2)
- Correlation (2)
- Electroweak Interaction (2)
- Epidemiology (2)
- FBSDE (2)
- Flavour Physics (2)
- Immunology (2)
- Leptonic, semileptonic & radiative decays (2)
- Mechanisms of disease (2)
- Mitochondria (2)
- Non-small cell lung cancer (2)
- Omicron (2)
- Particle decays (2)
- RHIC (2)
- Radiative decay (2)
- Radiotherapy (2)
- Rare diseases (2)
- Registries (2)
- SARS-CoV-2 (2)
- SARS-CoV-2 monitoring (2)
- STAR (2)
- Shear viscosity (2)
- Treatment (2)
- asset pricing (2)
- cirrhosis (2)
- consumption-portfolio choice (2)
- incomplete markets (2)
- microdosing (2)
- recursive utility (2)
- 140Ce (1)
- 3years (1)
- ACLF (1)
- ADGRE1 (1)
- AIS (1)
- ALK (1)
- ALK-rearranged NSCLC (1)
- ARDS (1)
- ATM (1)
- Acuris (1)
- Acute elbow dislocation (1)
- Advanced biliary tract cancer (1)
- Alpha-synuclein (1)
- Alternative oxidase (1)
- Antibiotic therapy (1)
- Antirheumatic agents (1)
- Araneae (1)
- Artificial Intelligence (1)
- Augenerkrankungen (1)
- Autosomal recessive cutis laxa type 1C (1)
- B-slope (1)
- B.1.1.529 (1)
- BA.4 (1)
- BA.5 (1)
- BESIII detector (1)
- BI1361849 (1)
- BTC (1)
- Bacterial leakage (1)
- Beam energy scan (1)
- Bhabha (1)
- Biodiversity Data (1)
- Biogeography (1)
- Biomedical engineering (1)
- Biomonitoring (1)
- Bipolar disorder (1)
- Born cross section (1)
- Born cross section measurement (1)
- Botanical Collections (1)
- Branching fraction measurement (1)
- CAD/CAM crown (1)
- CAKUT (1)
- CBA (1)
- CEP68 (1)
- COMP (1)
- COVID 19 (1)
- CP violation (1)
- CRVO (1)
- CV9202 (1)
- Cardiac implantable electronic devices (1)
- Cardiac rehabilitation (1)
- Cardiac resynchronization therapy (1)
- Cardiovascular disease risk (1)
- Cardiovascular diseases (1)
- Cement gap (1)
- Charged-particle multiplicity (1)
- Charm quark spatial diffusion coefficient (1)
- Charm vector (1)
- Charmonia (1)
- Charmonium (-like) (1)
- Chest pain unit (1)
- Child (1)
- Chiral magnetic effect (1)
- Circadian (1)
- Cirrhosis (1)
- Classification (1)
- Clinical trial (1)
- Coalescence (1)
- Cognitive impairment (1)
- Cohort studies (1)
- Cold nuclear matter effects (1)
- Colorectal cancer (1)
- Comparative effectiveness research (1)
- Complex II (1)
- Concept paper (1)
- Conometric connection (1)
- Consensus (1)
- Consensus document (1)
- Conservation (1)
- Consumption hump (1)
- Coronary intervention (1)
- Critical care (1)
- Critical point (1)
- Cross section (1)
- D meson (1)
- DME (1)
- DNA-PK (1)
- Dark photon (1)
- Dark sector (1)
- Data Standard (1)
- Data protection (1)
- Data sharing (1)
- Datenschutz (1)
- Dermatomyositis (1)
- Detection workflow (1)
- Deuteron production (1)
- Deutschland (1)
- Di-hadron correlations (1)
- Diagnosis (1)
- Digital (1)
- Digitization (1)
- ECM (1)
- EMR1 (1)
- Ecology (1)
- Ecophysiology (1)
- Ectoparasites (1)
- Education (1)
- Effective form factor (1)
- Einwanderer (1)
- Elastogenesis (1)
- Electromagnetic form factor (1)
- Electromagnetic form factors (1)
- Electromagnetic transitions (1)
- Elliptic flow (1)
- Equity (1)
- Etanercept (1)
- Exercise training (1)
- Experimental nuclear physics (1)
- Experimental particle physics (1)
- Extracellular matrix (1)
- Eye diseases (1)
- EyesiNet (1)
- F4/80 (1)
- FOS: Physical sciences (1)
- Fibulin-4 (1)
- Fibulin-5 (1)
- Flavor changing neutral currents (1)
- Flavor symmetries (1)
- Flow (1)
- Form factors (1)
- Forward physics (1)
- Fracture type (1)
- Fremdbild (1)
- GLM (1)
- Genetics (1)
- Genetics research (1)
- Geschichte 1981-1997 (1)
- Gomphus flavipes (1)
- Groomed jet radius (1)
- HCC (1)
- Hadron-Hadron scattering (experiments) (1)
- Hadronization (1)
- Hand-foot syndrome (1)
- Hantavirus (1)
- Health information (1)
- Health-seeking behaviour (1)
- Heart failure (1)
- Heavy Ion Experiments (1)
- Heavy Quark Production (1)
- Heavy ion collisions (1)
- Heavy-Ion Collision (1)
- Heavy-flavor decay electron (1)
- Heavy-ion (1)
- Helicity amplitude analysis (1)
- Helpline (1)
- Herbaria (1)
- Hif1α (1)
- High Energy Physics - Experiment (hep-ex) (1)
- Higher moments (1)
- Hyperons (1)
- Hypertension (1)
- Hypofractionated radiotherapy (1)
- ICU (1)
- IHMCIF (1)
- IL-6 (1)
- ILUVIEN (1)
- IR (1)
- ISS (1)
- Immunogenetics (1)
- Immunomonitoring (1)
- Implantable cardioverter-defibrillator (1)
- Inclusive branching fraction (1)
- Inflammation (1)
- Initial state radiation (1)
- Integrative Modeling (1)
- Interference fragmentation function (1)
- Invisible decays (1)
- J/ψ suppression (1)
- Jet substructure (1)
- K0S (1)
- K3EDTA plasma sampling (1)
- K48-linked (1)
- K63-linked (1)
- Konzeptpapier (1)
- Landscape ecology (1)
- Landschaftsökologie (1)
- Latent transforming growth factor β-binding protein 4 (1)
- Lehre (1)
- Libellen (1)
- Lifestyle (1)
- Lipidomics (1)
- Liver diseases (1)
- Ltbp-4 (1)
- Ltbp-4L (1)
- Ltbp-4S (1)
- L´evy framework (1)
- MACS (1)
- MCP-1 (1)
- MMPs (1)
- MRSA (1)
- MYCN amplification (1)
- Marginal integrity (1)
- Metabolomics (1)
- Microgap (1)
- Mitochondrial disease (1)
- Models & methods for nuclear reactions (1)
- Molecular diagnostic testing (1)
- Molecular medicine (1)
- Multiple parton interactions (1)
- Multivariate analysis (1)
- Myotis myotis (1)
- NAFLD (1)
- NET (1)
- NMDA IgA/IgM antibodies (1)
- NMDA antibody (1)
- NMR spectroscopy (1)
- NSCLC (1)
- NSTEMI (1)
- Net-charge correlations (1)
- Net-charge fluctuations (1)
- Netzhaut (1)
- Neutrinos (1)
- Neutron physics (1)
- Nonflow (1)
- Nuclear reactions (1)
- Nutzen (1)
- Oncogenes (1)
- Open Access (1)
- Ophiogomphus cecilia (1)
- Orphan disease (1)
- Osteoporosis (1)
- Outcome (1)
- Oxidative phosphorylation (1)
- PBSC (1)
- PDB-Dev (1)
- PDBx/mmCIF (1)
- PDE‐5‐inhibitor (1)
- PDGFRβ (1)
- PI3K (1)
- PRRT (1)
- PTEN (1)
- Pacemaker (1)
- Parkinson disease (1)
- Parkinson’s disease (1)
- Particle and resonance production (1)
- Particle phenomena (1)
- Patient safety (1)
- Periodontal disease (1)
- Periodontal therapy (1)
- Pest-crop interactions (1)
- Phalangeal fractures (1)
- Physical activity (1)
- Plasminogen (1)
- Platelets (1)
- Pneumonia (1)
- Portal veins (1)
- Poverty (1)
- Pre-analytics (1)
- Preclinical research (1)
- Predictive markers (1)
- Prevention (1)
- Prognosis (1)
- Prognostic models (1)
- Prostaglandin (1)
- Proton (1)
- Proton-proton collisions (1)
- Proton–proton collisions (1)
- Psychiatric disorders (1)
- Psychiatry (1)
- Puumala virus (1)
- QCD (1)
- Quantum chromodynamics (1)
- RAS pathway (1)
- RNA (1)
- RNA-binding proteins (1)
- Radiative capture (1)
- Rapps (1)
- Rare decays (1)
- Real world (1)
- Register (1)
- Remission (1)
- Research Infrastructure (1)
- Resonance reactions (1)
- Respiratory chain (1)
- Retina (1)
- Retro-IDEAL (1)
- Rh(II) catalysis (1)
- Rheumatoid arthritis (1)
- Rodent-associated infections (1)
- Roosting place (1)
- SARS CoV 2 (1)
- SD-OCT (1)
- SLC20A1 (1)
- SPSS (1)
- STED superresolution (1)
- Sampling protocol (1)
- Schulbuch (1)
- Schädling (1)
- Seasonal variation (1)
- Seltene Erkrankungen (1)
- Semantics (1)
- Semi-leptonic decays (1)
- Single-molecule biophysics (1)
- Social determinants (1)
- SoftDrop (1)
- Solar insolation (1)
- Sorafenib (1)
- Spatial scales (1)
- Spatio-temporal patterns (1)
- Spin alignment (1)
- Spine care (1)
- Spinturnix myoti (1)
- Splitting function (1)
- Standardization (1)
- Staphylococcus aureus (1)
- Stentoplasty (1)
- Steroid (1)
- Student (1)
- Suicide (1)
- Sunlight (1)
- Super-resolution microscopy (1)
- Surgical oncology (1)
- TACE (1)
- TGR(mREN2)27 (1)
- TP53 mutation status (1)
- Taxonomy (1)
- Techniques Electromagnetic calorimeters (1)
- Telemedicine (1)
- Thermal model (1)
- Thoracic trauma (1)
- Threshold effect (1)
- Thrombosis (1)
- Thromboxane (1)
- Transversity (1)
- UWB diagnostics (1)
- VEGF (1)
- VEGFR-2 (1)
- VEGFR-3 (1)
- Variant of concern (1)
- Veins (1)
- Vertebral augmentation (1)
- Vertebral body stenting (1)
- Vertebral fracture (1)
- Vitreous samples (1)
- Wastewater-based epidemiology (WBE) (1)
- Western diet (1)
- Worldwide Protein Data Bank (1)
- X-ray crystallography (1)
- Y states (1)
- accessory proteins (1)
- acute decompensation (1)
- acute myeloid leukemia (1)
- acute-on-chronic liver failure (1)
- adaptive cardiac remodelling (1)
- adverse events (1)
- alternative oxidase (1)
- anaesthesia in orthopaedics (1)
- anaesthetics (1)
- autoantibodies (1)
- azaindole (1)
- backward stochastic differential equation (1)
- bioactivity testing (1)
- bladder exstrophy-epispadias complex (1)
- bleomycin (1)
- bundle (1)
- c-kit (1)
- capture (1)
- cardiac ischaemia‐reperfusion (1)
- cartilage (1)
- cell stress (1)
- cell-free protein synthesis (1)
- center-of-mass energy (1)
- centrosome (1)
- centrosome linker (1)
- cerium (1)
- certainty equivalents (1)
- charmonium-like states (1)
- cloacal malformation (1)
- complications (1)
- computed tomography (1)
- consumption hump (1)
- convergence (1)
- cross-section (1)
- cytarabine dose (1)
- diabetic macular edema (1)
- diazo compounds (1)
- dimuon (1)
- dynamic programming (1)
- e+e − annihilation (1)
- e+e⁻ − Experiments (1)
- e+e− Experiments (1)
- easyPACId (1)
- ectosomes (1)
- education (1)
- elderly (1)
- electron transport chain (1)
- electron-positron collision (1)
- epigeic spiders (1)
- epigäische Spinnen (1)
- erectile dysfunction (1)
- exosomes (1)
- extracellular vesicles (1)
- fibrogenesis (1)
- fixed point approach (1)
- fluocinolone acetonide (1)
- fluorescent dye (1)
- functional genetics (1)
- generalist predators (1)
- generalistische Prädatoren (1)
- geriatric medicine (1)
- global change (1)
- guidelines (1)
- habit formation (1)
- habitat destruction (1)
- hadron spectroscopy (1)
- hadronic events (1)
- health information exchange (1)
- heavy-ion collisions (1)
- helicity amplitude analysis (1)
- hematotoxicity (1)
- hepatic encephalopathy (1)
- hepatic stellate cells (1)
- hepatocellular cancer (1)
- high-risk neuroblastoma (1)
- immunity (1)
- impatience (1)
- in vitro models (1)
- inclusive J/ψ decays (1)
- inflammation (1)
- intrinsically disordered region (1)
- jumps (1)
- kidney formation (1)
- land use (1)
- leisure (1)
- life-cycle utility maximization (1)
- liver (1)
- liver fibrosis (1)
- mRNA active cancer immunotherapy (1)
- macrophage (1)
- metallo β lactamases (1)
- microparticles (1)
- microvesicles (1)
- microwave ablation (1)
- microwave breast imaging (1)
- minimal information requirements (1)
- mouse (1)
- mouse model (1)
- multiresistant bacteria (1)
- n_TOF (1)
- natural products (1)
- nematophin (1)
- neuroendocrine tumor (1)
- neutralizing antibodies (1)
- neutron (1)
- nonstructural proteins (1)
- non‐selective beta‐blocker (1)
- normalization (1)
- nucleosynthesis (1)
- number of J/ψ events (1)
- optimal investment (1)
- osteoarthritis (1)
- oval split ring resonator (1)
- p+p collisions (1)
- p53 pathway (1)
- patient study (1)
- peptide receptor radionuclide therapy (1)
- peripheral blood stem cell collection (1)
- polyubiquitin (1)
- portosystemic shunt (1)
- prevention (1)
- primary biliary cholangitis (1)
- proteobacteria (1)
- qualitative research (1)
- quality control (1)
- rare diseases (1)
- reactive oxygen species (1)
- renin-angiotensin system (1)
- reproducibility (1)
- resectability (1)
- rigor (1)
- rootletin (1)
- s-process (1)
- second line therapy (1)
- sequential ALK-inhibitor therapy (1)
- simplified production (1)
- sorafenib (1)
- sphingolipid sphingosine-1-phosphate (1)
- sphingolipids (1)
- sphingosine-1-phosphate receptor 5 (1)
- spike protein (1)
- spontaneous portosystemic shunt (1)
- standardization (1)
- steatosis (1)
- stochastic volatility (1)
- structural proteins (1)
- surgery (1)
- systemic sclerosis (1)
- tetraquark (1)
- theranostics (1)
- thiol inhibitors (1)
- thrombospondins (1)
- treatment (1)
- treatment response (1)
- trigger efficiency (1)
- ubiquitin-conjugating enzymes (1)
- urinary tract development (1)
- ursodeoxycholic acid (1)
- variant of concern (1)
- variants of concern (1)
- wage hump (1)
- wastewater-based epidemiology (WBE) (1)
- welfare loss (1)
- wwPDB (1)
- zebrafish development (1)
- Λ+c baryon (1)
- Σ hyperon (1)
- Υ suppression (1)
- ψ(3686) (1)
- fibrogenesis (1)
Institute
- Physik (381)
- Frankfurt Institute for Advanced Studies (FIAS) (106)
- Medizin (91)
- Geowissenschaften (23)
- Präsidium (8)
- Biochemie und Chemie (7)
- Biochemie, Chemie und Pharmazie (7)
- Biowissenschaften (7)
- Wirtschaftswissenschaften (7)
- Center for Financial Studies (CFS) (6)
Based on (10.09±0.04)×109 J/ψ events collected with the BESIII detector operating at the BEPCII collider, a partial wave analysis of the decay J/ψ→ϕπ0η is performed. We observe for the first time two new structures on the ϕη invariant mass distribution, with statistical significances of 24.0σ and 16.9σ; the first with JPC = 1+−, mass M = (1911 ± 6 (stat.) ± 14 (sys.))~MeV/c2, and width Γ= (149 ± 12 (stat.) ± 23 (sys.))~MeV, the second with JPC = 1−−, mass M = (1996 ± 11 (stat.) ± 30 (sys.))~MeV/c2, and width Γ = (148 ± 16 (stat.) ± 66 (sys.))~MeV. These measurements provide important input for the strangeonium spectrum. In addition, the f0(980)−a0(980)0 mixing signal in J/ψ→ϕf0(980)→ϕa0(980)0 and the corresponding electromagnetic decay J/ψ→ϕa0(980)0 are measured with improved precision, providing crucial information to understand the nature of a0(980)0 and f0(980).
Precision measurements of the semileptonic decays 𝐷+𝑠→𝜂𝑒+𝜈𝑒 and 𝐷+𝑠→𝜂′𝑒+𝜈𝑒 are performed with 7.33 fb−1 of 𝑒+𝑒− collision data collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector. The branching fractions obtained are ℬ(𝐷+𝑠→𝜂𝑒+𝜈𝑒) = (2.255±0.039stat±0.051syst)% and ℬ(𝐷+𝑠→𝜂′𝑒+𝜈𝑒)=(0.810±0.038stat±0.024syst)%. Combining these results with the ℬ(𝐷+→𝜂𝑒+𝜈𝑒) and ℬ(𝐷+→𝜂′𝑒+𝜈𝑒) obtained from previous BESIII measurements, the 𝜂−𝜂′ mixing angle in the quark flavor basis is determined to be 𝜙P=(40.0±2.0stat±0.6syst)°. Moreover, from the fits to the partial decay rates of 𝐷+𝑠→𝜂𝑒+𝜈𝑒 and 𝐷+𝑠→𝜂′𝑒+𝜈𝑒, the products of the hadronic transition form factors 𝑓𝜂(′)+(0) and the modulus of the 𝑐→𝑠 Cabibbo-Kobayashi-Maskawa matrix element |𝑉𝑐𝑠| are determined by using different hadronic transition form factor parametrizations. Based on the two-parameter series expansion, the products 𝑓𝜂+(0)|𝑉𝑐𝑠| = 0.4519±0.0071stat±0.0065syst and 𝑓𝜂′+(0)|𝑉𝑐𝑠| = 0.525±0.024stat±0.009syst are extracted. All results determined in this work supersede those measured in the previous BESIII analyses based on the 3.19 fb−1 subsample of data at 4.178 GeV.
Using 2.93 fb−1 of e+e− collision data collected with the BESIII detector at the center-of-mass energy of 3.773 GeV, we investigate the semileptonic decays D+→π+π−ℓ+νℓ (ℓ=e and μ). The D+→f0(500)μ+νμ decay is observed for the first time. By analyzing simultaneously the differential decay rates of D+→f0(500)μ+νμ and D+→f0(500)e+νe in different ℓ+νℓ four-momentum transfer intervals, the product of the relevant hadronic form factor ff0+(0) and the magnitude of the c→d Cabibbo-Kobayashi-Maskawa matrix element |Vcd| is determined to be ff0+(0)|Vcd|=0.0787±0.0060stat±0.0033syst for the first time. With the input of |Vcd| from the global fit in the standard model, we determine ff0+(0)=0.350±0.027stat±0.015syst. The absolute branching fractions of D+→f0(500)(π+π−)μ+νμ and D+→ρ0(π+π−)μ+νμ are determined as (0.72±0.13stat±0.10syst)×10−3 and (1.64±0.13stat±0.11syst)×10−3. Combining these results with those of previous BESIII measurements on their semielectronic counterparts from the same data sample, we test lepton flavor universality by measuring the branching fraction ratios BD+→ρ0μ+νμ/BD+→ρ0e+νe = 0.88±0.10 and BD+→f0(500)μ+νμ/BD+→f0(500)e+νe = 1.14±0.28, which are compatible with the standard model expectation.
Using 7.33~fb−1 of e+e− collision data collected by the BESIII detector at center-of-mass energies in the range of s√=4.128−4.226~GeV, we search for the rare decays D+s→h+(h0)e+e−, where h represents a kaon or pion. By requiring the e+e− invariant mass to be consistent with a ϕ(1020), 0.98<M(e+e−)<1.04 ~GeV/c2, the decay D+s→π+ϕ,ϕ→e+e− is observed with a statistical significance of 7.8σ, and evidence for the decay D+s→ρ+ϕ,ϕ→e+e− is found for the first time with a statistical significance of 4.4σ. The decay branching fractions are measured to be B(D+s→π+ϕ,ϕ→e+e−)=(1.17+0.23−0.21±0.03)×10−5, and B(D+s→ρ+ϕ,ϕ→e+e−)=(2.44+0.67−0.62±0.16)×10−5, where the first uncertainties are statistical and the second systematic. No significant signal for the three four-body decays of D+s→π+π0e+e−, D+s→K+π0e+e−, and D+s→K0Sπ+e+e− is observed. For D+s→π+π0e+e−, the ϕ mass region is vetoed to minimize the long-distance effects. The 90% confidence level upper limits set on the branching fractions of these decays are in the range of (7.0−8.1)×10−5.
During the 2016-17 and 2018-19 running periods, the BESIII experiment collected 7.5~fb−1 of e+e− collision data at center-of-mass energies ranging from 4.13 to 4.44 GeV. These data samples are primarily used for the study of excited charmonium and charmoniumlike states. By analyzing the di-muon process e+e−→(γISR/FSR)μ+μ−, we measure the center-of-mass energies of the data samples with a precision of 0.6 MeV. Through a run-by-run study, we find that the center-of-mass energies were stable throughout most of the data-taking period.
Using data samples with an integrated luminosity of 22.42 fb−1 collected by the BESIII detector operating at the BEPCII storage ring, we measure the cross sections of the 𝑒+𝑒−→𝜂𝐽/𝜓 process at center-of-mass energies from 3.808 to 4.951 GeV. Three structures are observed in the line shape of the measured cross sections. A maximum-likelihood fit with 𝜓(4040), two additional resonances, and a nonresonant component are performed. The mass and width of the first additional state are (4219.7±2.5±4.5) MeV/𝑐2 and (80.7±4.4±1.4) MeV, respectively, consistent with the 𝜓(4230). For the second state, the mass and width are (4386±13±17) MeV/𝑐2 and (177±32±13) MeV, respectively, consistent with the 𝜓(4360). The first uncertainties are statistical, and the second ones are systematic. The statistical significance of 𝜓(4040) is 8.0𝜎 and those for 𝜓(4230) and 𝜓(4360) are more than 10.0𝜎.
The process e+e−→Σ+Σ¯− is studied from threshold up to 3.04 GeV/c2 via the initial-state radiation technique using data with an integrated luminosity of 12.0 fb−1, collected at center-of-mass energies between 3.773 and 4.258 GeV with the BESIII detector at the BEPCII collider. The pair production cross sections and the effective form factors of Σ are measured in eleven Σ+Σ¯− invariant mass intervals from threshold to 3.04 GeV/c2. The results are consistent with the previous results from Belle and BESIII. Furthermore, the branching fractions of the decays J/ψ→Σ+Σ¯− and ψ(3686)→Σ+Σ¯− are determined and the obtained results are consistent with the previous results of BESIII.
With data samples collected with the BESIII detector at seven energy points at √s = 3.68 − 3.71 GeV, corresponding to an integrated luminosity of 333 pb−1, we present a study of the Λ transverse polarization in the e+e− → ΛΛ¯ reaction. The signifcance of polarization by combining the seven energy points is found to be 2.6σ including the systematic uncertainty, which implies a non-zero phase between the transition amplitudes of the ΛΛ¯ helicity states. The modulus ratio and the relative phase of EM-psionic form factors combined with all energy points are measured to be RΨ = 0.71+0.10−0.10 ± 0.03 and ∆ΦΨ = 23+8.8−8.0 ± 1.6◦, where the frst uncertainties are statistical and the second systematic.
We present the first observation of the singly Cabibbo-suppressed decay Λ+c→ΛK+π0 with a significance of 5.7σ and the first evidence of Λ+c→ΛK+π+π− decay with a significance of 3.1σ, based on e+e− annihilation data recorded by the BESIII detector at the BEPCII collider. The data correspond to an integrated luminosity of 6.4 fb−1, in the center-of-mass energy range from 4.600 GeV to 4.950 GeV. We determine the branching fractions of Λ+c→ΛK+π0 and Λ+c→ΛK+π+π− relative to their Cabibbo-favored counterparts to be B(Λ+c→ΛK+π0)B(Λ+c→Λπ+π0)=(2.09±0.39stat.±0.07syst.)×10−2 and B(Λ+c→ΛK+π+π−)B(Λ+c→Λπ+π+π−)=(1.13±0.41stat.±0.06syst.)×10−2, respectively. Moreover, by combining our measured result with the world average of B(Λ+c→Λπ+π0), we obtain the branching fraction B(Λ+c→ΛK+π0)=(1.49±0.27stat.±0.05syst.±0.08ref.)×10−3. This result significantly departs from theoretical predictions based on quark SU(3) flavor symmetry, which is underpinned by the presumption of meson pair S-wave amplitude dominance.
We search for an axion-like particle (ALP) a through the process ψ(3686)→π+π−J/ψ, J/ψ→γa, a→γγ in a data sample of (2.71±0.01)×109 ψ(3686) events collected by the BESIII detector. No significant ALP signal is observed over the expected background, and the upper limits on the branching fraction of the decay J/ψ→γa and the ALP-photon coupling constant gaγγ are set at 95% confidence level in the mass range of 0.165≤ma≤2.84GeV/c2. The limits on B(J/ψ→γa) range from 8.3×10−8 to 1.8×10−6 over the search region, and the constraints on the ALP-photon coupling are the most stringent to date for 0.165≤ma≤1.468GeV/c2.
Using a sample of (10087±44)×106 J/ψ events, which is about fifty times larger than that was previously analyzed, a further investigation on the J/ψ→γ3(π+π−) decay is performed. A significant distortion at 1.84 GeV/c2 in the line-shape of the 3(π+π−) invariant mass spectrum is observed for the first time, which is analogous to the behavior of X(1835) and could be resolved by two overlapping resonant structures, X(1840) and X(1880). The new state X(1880) is observed with a statistical significance of 14.7σ. The mass and width of X(1880) are determined to be 1882.1±1.7±0.7 MeV/c2 and 30.7±5.5±2.4 MeV, respectively, which indicates the existence of a pp¯ bound state.
The Cabbibo-favored decay Λ+c→Ξ0K+π0 is studied for the first time using 6.1 fb−1 of e+e− collision data at center-of-mass energies between 4.600 and 4.840 GeV, collected with the BESIII detector at the BEPCII collider. With a double-tag method, the branching fraction of the three-body decay Λ+c→Ξ0K+π0 is measured to be (7.79±1.46±0.71)×10−3, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction of the two-body decay Λ+c→Ξ(1530)0K+ is (5.99±1.04±0.29)×10−3, which is consistent with the previous result of (5.02±0.99±0.31)×10−3. In addition, the upper limit on the branching fraction of the doubly Cabbibo-suppressed decay Λ+c→nK+π0 is 7.1×10−4 at the 90% confidence level. The upper limits on the branching fractions of Λ+c→Σ0K+π0 and ΛK+π0 are also determined to be 1.8×10−3 and 2.0×10−3, respectively.
The Cabbibo-favored decay Λ+c→Ξ0K+π0 is studied for the first time using 6.1 fb−1 of e+e− collision data at center-of-mass energies between 4.600 and 4.840 GeV, collected with the BESIII detector at the BEPCII collider. With a double-tag method, the branching fraction of the three-body decay Λ+c→Ξ0K+π0 is measured to be (7.79±1.46±0.71)×10−3, where the first and second uncertainties are statistical and systematic, respectively. The branching fraction of the two-body decay Λ+c→Ξ(1530)0K+ is (5.99±1.04±0.29)×10−3, which is consistent with the previous result of (5.02±0.99±0.31)×10−3. In addition, the upper limit on the branching fraction of the doubly Cabbibo-suppressed decay Λ+c→nK+π0 is 7.1×10−4 at the 90% confidence level. The upper limits on the branching fractions of Λ+c→Σ0K+π0 and ΛK+π0 are also determined to be 1.8×10−3 and 2.0×10−3, respectively.
Based on 4.5 fb−1 data taken at seven center-of-mass energies ranging from 4.600 to 4.699 GeV with the BESIII detector at the BEPCII collider, we measure the branching fractions of Λ + c → Σ + + hadrons relative to Λ + c → Σ +π +π −. Combining with the world average branching fraction of Λ + c → Σ +π +π −, their branching fractions are measured to be (0.377 ± 0.042 ± 0.020 ± 0.021)% for Λ + c → Σ +K+K−, (0.200 ± 0.023 ± 0.011 ± 0.011)% for Λ + c → Σ+K+π−, (0.414 ± 0.080 ± 0.030 ± 0.023)% for Λ + c → Σ +φ and (0.197 ± 0.036 ± 0.009 ± 0.011)% for Λ + c → Σ +K+K−(non-φ). In all the above results, the first uncertainties are statistical, the second are systematic and the third are from external input of the branching fraction of Λ + c → Σ +π +π −. Since no signal for Λ + c → Σ +K+π−π 0 is observed, the upper limit of its branching fraction is determined to be 0.13% at the 90% confidence level.
We present the first observation of the singly Cabibbo-suppressed decay Λ+𝑐→Λ𝐾+𝜋0 with a significance of 5.7𝜎 and the first evidence of Λ+𝑐→Λ𝐾+𝜋+𝜋− decay with a significance of 3.1𝜎, based on 𝑒+𝑒−annihilation data recorded by the BESIII detector at the BEPCII collider. The data correspond to an integrated luminosity of 6.4 fb−1, in the center-of-mass energy range from 4.600 to 4.950 GeV. We determine the branching fractions of Λ+𝑐→Λ𝐾+𝜋0 and Λ+𝑐→Λ𝐾+𝜋+𝜋− relative to their Cabibbo-favored counterparts to be ℬ(Λ+𝑐→Λ𝐾+𝜋0)ℬ(Λ+𝑐→Λ𝜋+𝜋0) = (2.09±0.39stat±0.07syst)×10−2 and ℬ(Λ+𝑐→Λ𝐾+𝜋+𝜋−)ℬ(Λ+𝑐→Λ𝜋+𝜋+𝜋−) = (1.13±0.41stat±0.06syst)×10−2, respectively. Moreover, by combining our measured result with the world average of ℬ(Λ+𝑐→Λ𝜋+𝜋0), we obtain the branching fraction ℬ(Λ+𝑐→Λ𝐾+𝜋0) = (1.49±0.27stat±0.05syst±0.08ref)×10−3. This result significantly departs from theoretical predictions based on quark 𝑆𝑈(3) flavor symmetry, which is underpinned by the presumption of meson pair 𝑆-wave amplitude dominance.
Evidence for the singly Cabibbo suppressed decay Λ+c→pπ0 is reported for the first time with a statistical significance of 3.7σ based on 6.0 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.843 GeV with the BESIII detector at the BEPCII collider. The absolute branching fraction of Λ+c→pπ0 is measured to be (1.56+0.72−0.58±0.20)×10−4, which distinctly exceeds the upper limit measured by Belle experiment. Combining with the branching fraction of Λ+c→nπ+, (6.6±1.3)×10−4, the ratio of the branching fractions of Λ+c→nπ+ and Λ+c→pπ0 is calculated to be 3.2+2.2−1.2. As an important input for the theoretical models describing the decay mechanisms of charmed baryons, our result indicates that the non-factorizable contributions play an essential role and their interference with the factorizable contributions should not be significant. In addition, the absolute branching fraction of Λ+c→pη is measured to be (1.63±0.31stat±0.11syst)×10−3, which is consistent with previous measurements.
Evidence for the singly Cabibbo suppressed decay Λ+c→pπ0 is reported for the first time with a statistical significance of 3.7σ based on 6.0 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.843 GeV with the BESIII detector at the BEPCII collider. The absolute branching fraction of Λ+c→pπ0 is measured to be (1.56+0.72−0.58±0.20)×10−4. Combining with the branching fraction of Λ+c→nπ+, (6.6±1.2±0.4)×10−4, the ratio of the branching fractions Λ+c→nπ+ and Λ+c→pπ0 is calculated to be 4.2+2.2−1.9; this is an important input for the understanding of the decay mechanisms of charmed baryons. In addition, the absolute branching fraction of Λ+c→pη is measured to be (1.63±0.31stat±0.11syst)×10−3, which is consistent with previous measurements.
Using a sample of (10087±44)×106 𝐽/𝜓 events, which is about 45 times larger than that was previously analyzed, a further investigation on the 𝐽/𝜓→𝛾3(𝜋+𝜋−) decay is performed. A significant distortion at 1.84 GeV/𝑐2 in the line shape of the 3(𝜋+𝜋−) invariant mass spectrum is observed for the first time, which could be resolved by two overlapping resonant structures, 𝑋(1840) and 𝑋(1880). The new state 𝑋(1880) is observed with a statistical significance larger than 10𝜎. The mass and width of 𝑋(1880) are determined to be 1882.1±1.7±0.7 MeV/𝑐2 and 30.7±5.5±2.4 MeV, respectively, which indicates the existence of a 𝑝¯ 𝑝 bound state.
Observation of η_(c)(1S, 2S) and χ_(cJ) decays to 2(π⁺π^(−))η via ψ(3686) radiative transitions
(2024)
Based on 2.7×109 ψ(3686) decays collected with the BESIII detector, the radiative decay ψ(3686)→γ2(π+π−)η is investigated to measure properties of S- and P-wave charmonium states. The branching fraction of the decay ηc(1S)→2(π+π−)η, which is found to have a strong dependence on the interference pattern between ηc(1S) and non-ηc(1S) processes, is measured in both destructive and constructive interference scenarios for the first time. The mass and width of the ηc(1S) are measured to be M=(2984.14±0.13±0.38) MeV/c2 and Γ=(28.82±0.11±0.82) MeV, respectively. Clear signals for the decays of the χcJ(J=0,1,2) and the ηc(2S) to 2(π+π−)η are also observed for the first time, and the corresponding branching fractions are measured. The ratio of the branching fractions between the ηc(2S) and ηc(1S) decays is significantly lower than the theoretical prediction, which might suggest different dynamics in their decays.