Refine
Year of publication
Document Type
- Preprint (836)
- Article (689)
- Conference Proceeding (4)
- Doctoral Thesis (1)
- Working Paper (1)
Language
- English (1524)
- German (6)
- Multiple languages (1)
Has Fulltext
- yes (1531)
Is part of the Bibliography
- no (1531)
Keywords
- Heavy Ion Experiments (20)
- e +-e − Experiments (14)
- BESIII (12)
- Hadron-Hadron Scattering (11)
- Hadron-Hadron scattering (experiments) (11)
- Branching fraction (9)
- LHC (9)
- Particle and Resonance Production (9)
- Charm Physics (6)
- Heavy-ion collision (6)
- Spectroscopy (6)
- HIV (5)
- Quarkonium (5)
- ALICE experiment (4)
- Charm physics (4)
- Collective Flow (4)
- Electroweak interaction (4)
- Exotics (4)
- Inverse kinematics (4)
- Jets (4)
- Lepton colliders (4)
- Osteoporosis (4)
- Quark-Gluon Plasma (4)
- Quasi-free scattering (4)
- ALICE (3)
- Biomarkers (3)
- Bone density (3)
- COVID-19 (3)
- Charmed mesons (3)
- Experimental nuclear physics (3)
- Experimental particle physics (3)
- Hadronic decays (3)
- Heavy Ions (3)
- Jets and Jet Substructure (3)
- Oncology (3)
- Particle and resonance production (3)
- QCD (3)
- Spectroscopic factors (3)
- Spine (3)
- breast cancer (3)
- e+-e− Experiments (3)
- pp collisions (3)
- Antiretroviral therapy (2)
- Beauty production (2)
- Branching fractions (2)
- CT (2)
- Charmonium (2)
- Cirrhosis (2)
- Computed tomography (2)
- Diagnostic markers (2)
- Diagnostik (2)
- Electroweak Interaction (2)
- Epilepsy (2)
- Flavour Physics (2)
- Früherkennung (2)
- Heart failure (2)
- Heavy Quark Production (2)
- Hypertension (2)
- Inflammation (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Leptonic, semileptonic & radiative decays (2)
- Liver diseases (2)
- Mammakarzinom (2)
- Nachsorge (2)
- Nuclear reactions (2)
- Particle Correlations and Fluctuations (2)
- Particle correlations and fluctuations (2)
- Particle decays (2)
- Pb–Pb collisions (2)
- Radiative decay (2)
- Relativistic heavy-ion collisions (2)
- Richtlinie (2)
- Seizure (2)
- Shell model (2)
- Single electrons (2)
- Single-particle states (2)
- biomarker (2)
- diagnosis (2)
- follow‑up (2)
- guideline (2)
- pelvic packing (2)
- reference values (2)
- screening (2)
- 900 GeV (1)
- ABC transporters (1)
- ALICE detector (1)
- ALK (1)
- APRI (1)
- ATPases (1)
- Absolute branching fraction (1)
- Accelerators & Beams (1)
- Accelerators & storage rings (1)
- Acute coronary syndrome (1)
- Alpha-synuclein (1)
- Angiography (1)
- Angiomyolipoma (1)
- Anti-nuclei (1)
- Anti-seizure medication (1)
- Anticonvulsant (1)
- Antiretrovirals (1)
- Antirheumatic agents (1)
- Antiviral therapy (1)
- Aortic valve (1)
- Apoptosis (1)
- Artesunate (1)
- Atherosclerosis (1)
- Atomic & molecular beams (1)
- Atomic, Molecular & Optical (1)
- Atrial fibrillation (1)
- B cell receptor (1)
- B cell subpopulations (1)
- BESIII detector (1)
- BRCA1 (1)
- BRCA2 (1)
- Bacterial genomics (1)
- Bayesian inference (1)
- Beam loss (1)
- Bhabha (1)
- Biomarker (1)
- Bipolar disorder (1)
- Bleeding (1)
- Blood plasma (1)
- Blood pressure (1)
- Body mass index (1)
- Bone diseases (1)
- Bone diseases, Metabolic (1)
- Boosted Jets (1)
- Born cross section (1)
- Born cross section measurement (1)
- Branching fraction measurement (1)
- Breast cancer (1)
- C-clamp (1)
- C3M (1)
- C4M (1)
- CD16 (1)
- CD56 (1)
- COVID 19 (1)
- CP violation (1)
- CRPC (1)
- CT dual-energy computed tomography (1)
- CVID (1)
- Cancer (1)
- Cancer treatment (1)
- Cardiac implantable electronic devices (1)
- Cardiac rehabilitation (1)
- Cardiac resynchronization therapy (1)
- Cardiac troponin (1)
- Cardiology (1)
- Cardiovascular biology (1)
- Cardiovascular disease risk (1)
- Cardiovascular diseases (1)
- Cell-to-Cell Spread (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charge fluctuations (1)
- Charge-transfer collisions (1)
- Charm vector (1)
- Charmed baryon (1)
- Charmonium (-like) (1)
- Chemoradiotherapy (1)
- Child (1)
- Children (1)
- Chronic obstructive pulmonary disease (1)
- Circular accelerators (1)
- Clinical study (1)
- Clinical variation (1)
- Cohort studies (1)
- Collagen Maps (1)
- Collective Flow, (1)
- Comparative effectiveness research (1)
- Comparison with QCD (1)
- Complex II (1)
- Computed tomography, X-ray (1)
- Consensus (1)
- Consensus document (1)
- Contrast agent (1)
- Costs (1)
- Cross section (1)
- Cross sections (1)
- Culture positive (1)
- D meson (1)
- DECT (1)
- Dark photon (1)
- Dark sector (1)
- De-isolation (1)
- Death rates (1)
- Dermatomyositis (1)
- Diagnosis (1)
- Diagnostic differentiation (1)
- Digestive system procedures (1)
- Direct nuclear reactions (1)
- Direct reactions (1)
- Docetaxel (1)
- Drug screens (1)
- Dual-energy computed tomography (1)
- Economics (1)
- Effective form factor (1)
- Eicosanoids (1)
- Ejection fraction (1)
- Elderly (1)
- Electromagnetic form factor (1)
- Electromagnetic form factors (1)
- Electron-pion identification (1)
- Electronic transitions (1)
- Elliptic flow (1)
- Endocrinology (1)
- Endoscopy (1)
- Ephrin-B2–EphB4 (1)
- Esophagectomy (1)
- Europe (1)
- European Society for Immunodeficiencies (ESID) (1)
- Everolimus (1)
- Exercise training (1)
- Exosomes (1)
- FAPI PET (1)
- FIB-4 (1)
- FOS: Physical sciences (1)
- Falciparum (1)
- Fatty acids (1)
- Fatty liver (1)
- Femtoscopy (1)
- Fibre/foam sandwich radiator (1)
- Fibrosis (1)
- Fibrotest (1)
- First-line combination antiretroviral therapy (1)
- Flavor changing neutral currents (1)
- Flavor symmetries (1)
- Form factors (1)
- Forschung (1)
- Frailty (1)
- Gadobutrol (1)
- Gadopentate dimeglumine (1)
- General practitioners (1)
- Genetics (1)
- German PID-NET registry (1)
- Gleason Grade Group (1)
- HBT (1)
- HBV (1)
- HCV (1)
- HER2-positive (1)
- HIV-1 (1)
- HNO (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hals-Nasen-Ohren-Heilkunde (1)
- Hard Scattering (1)
- Health economics (1)
- Heavy Ion Experiment (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ion storage ring (1)
- Heavy ions (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion collisions (1)
- Helicity amplitude analysis (1)
- Hematology (1)
- Hepatitis B virus (1)
- Hepatitis C virus (1)
- Hepatocellular carcinoma (1)
- Hepatotoxicity (1)
- Hereditary breast and ovarian cancer (1)
- Herniated disk (1)
- High Energy Physics - Experiment (hep-ex) (1)
- High-energy neutron detection (1)
- Human behaviour (1)
- Hyperons (1)
- ICL (1)
- ICL V4c (1)
- INR (1)
- IgG substitution therapy (1)
- Image processing (1)
- Implantable cardioverter-defibrillator (1)
- In-TIPS thrombosis (1)
- Inclusive branching fraction (1)
- Inclusive spectra (1)
- Initial state radiation (1)
- Intensity interferometry (1)
- International normalized ratio (1)
- Intervertebral disc displacement (1)
- Invariant Mass Distribution (1)
- Invisible decays (1)
- Ionisation energy loss (1)
- Isoscalar giant resonances (1)
- Jet Physics (1)
- Jet Substructure (1)
- K0S (1)
- Kidney diseases (1)
- Lehre (1)
- Leukemias (1)
- Liver (1)
- Liver enzymes (1)
- Liver fibrosis (1)
- Liver transplantation (1)
- Long non-coding RNAs (1)
- Low & intermediate-energy accelerators (1)
- Lumbar Disk Degeneration (1)
- MHC (1)
- MRI (1)
- MTOR inhibitor (1)
- MYCN amplification (1)
- Malaria (1)
- Masquelet technique (1)
- Material budget (1)
- MicroRNAs (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Mitochondria (1)
- Molecular diagnostic testing (1)
- Molecular neuroscience (1)
- Monte Carlo (1)
- Multi-Parton Interactions (1)
- Multi-neutron detection (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Multivariate analysis (1)
- Mycobacteria (1)
- Mycobacterium avium complex (1)
- Myocardial infarction (1)
- Myopia (1)
- NK cells (1)
- NMR spectroscopy (1)
- Nanoscale biophysics (1)
- Neoadjuvant radiochemotherapy (1)
- Neoadjuvant therapy (1)
- Neural network (1)
- Neutrinos (1)
- Non-small cell lung cancer (1)
- Noninferiority (1)
- Nontuberculous mycobacteria (1)
- Nuclear astrophysics (1)
- Nuclear modification factor (1)
- Nuclear physics of explosive environments (1)
- Nuclear structure & decays (1)
- Nucleon induced nuclear reactions (1)
- ORL (1)
- Oesophagogastric cancer oxaliplatin (1)
- Oldest-old (1)
- One-nucleon removal (1)
- Open pulmonary tuberculosis (1)
- Opportunistic infections (1)
- Optical tweezers (1)
- Orbital electron capture (1)
- Osteoporotic fractures (1)
- Otorhinolaryngology (1)
- Oxidative phosphorylation (1)
- PDE‐5‐inhibitor (1)
- PID prevalence (1)
- PYTHIA (1)
- Pacemaker (1)
- Parkinson’s disease (1)
- Particle phenomena (1)
- Pathological complete response (1)
- Pb–Pb (1)
- Percutaneous (1)
- Personalized medicine (1)
- Phakic (1)
- Phantoms (imaging) (1)
- Phospholipids (1)
- Photon counting (1)
- Physical activity (1)
- Plasmodium (1)
- Plastic scintillator array (1)
- Point-of-care testing (1)
- Polarization (1)
- Post-processing (1)
- Pre-treatment drug resistance mutations (1)
- Predictive markers (1)
- Prevention (1)
- Production Cross Section (1)
- Prognosis (1)
- Properties of Hadrons (1)
- Protease inhibitor therapy (1)
- Proton (1)
- Proton–proton (1)
- Pseudarthrosis (1)
- Psychiatric disorders (1)
- QGP (1)
- Quantitative Imaging (1)
- Quantum chromodynamics (1)
- Quark Deconfinement (1)
- Quark Gluon Plasma (1)
- Quark Production (1)
- Quark gluon plasma (1)
- Quinine (1)
- RAS pathway (1)
- Radiative capture (1)
- Rapidity Range (1)
- Rare decays (1)
- Reactions with relativistic radioactive beams (1)
- Registries (1)
- Regulatory networks (1)
- Relativistic heavy ion physics (1)
- Renal lesions (1)
- Research (1)
- Residency (1)
- Resolution Parameter (1)
- Respiratory infections (1)
- Retinal diseases (1)
- Rhabdomyoma (1)
- SARS CoV 2 (1)
- SARS-CoV-2 (1)
- SARS-CoV‑2 pandemic (1)
- SARS-CoV‑2-Pandemie (1)
- SR-BI (1)
- SVR (1)
- Semi-leptonic decays (1)
- Severe malaria (1)
- Single muons (1)
- Single particle decay spectroscopy (1)
- Sociodemographic characteristics (1)
- Specialist training (1)
- Spectroscopic factors & electromagnetic moments (1)
- Sphingolipids (1)
- Sputum smear-negative (1)
- Stentoplasty (1)
- Storage ring (1)
- Subependymal giant cell astrocytoma (1)
- Super-resolution microscopy (1)
- Surgical oncology (1)
- Systematic Uncertainty (1)
- TB-therapy (1)
- TIPS (1)
- TR (1)
- TSC (1)
- Teaching (1)
- Techniques Electromagnetic calorimeters (1)
- Threshold effect (1)
- Time Projection Chamber (1)
- Tomography (1)
- Tomography (x-ray computed) (1)
- Tracking (1)
- Transferases (1)
- Transient elastography (1)
- Transition radiation detector (1)
- Transjugular Intrahepatic Portosystemic Shunt (1)
- Transverse momentum (1)
- Trigger (1)
- Triple negative (1)
- Triple-negative breast cancer (1)
- Two body weak decay (1)
- Type 2 diabetes (1)
- University hospitals (1)
- Universitätskliniken (1)
- Vector Boson Production (1)
- Vertebral augmentation (1)
- Vertebral body stenting (1)
- Vertebral fracture (1)
- Viral load (1)
- Virological failure (1)
- Virtual noncalcium reconstructions (1)
- Weiterbildung (1)
- X-ray computed (1)
- X-ray crystallography (1)
- Xenon-based gas mixture (1)
- Y states (1)
- accessory proteins (1)
- acoustic radiation force impulse imaging (1)
- acute myeloid leukemia (1)
- adaptive immunity (1)
- adult and elderly patients (1)
- allogeneic transplantation (1)
- angiography (1)
- angiopoietin-like 3 (ANGPTL3) (1)
- annual bleeding rate (1)
- anterior chamber depth changes (1)
- antigen presentation (1)
- auditory system (1)
- autoimmunity (1)
- biopsy cores (1)
- bone marrow derived mononuclear cells (1)
- cART (1)
- cancer therapy (1)
- cardiac magnetic resonance (1)
- castration resistance (1)
- cataract surgery (1)
- cell-free protein synthesis (1)
- center-of-mass energy (1)
- charmonium-like states (1)
- children (1)
- chronic kidney disease (1)
- clinical stage (1)
- co-infection (1)
- cohlear implant (1)
- cohort study (1)
- collagen degradation marker (1)
- component study (1)
- computer-assisted (1)
- critical size defect (1)
- cryo-EM (1)
- cyanines (1)
- cytarabine dose (1)
- dE/dx (1)
- decays (1)
- decision aids (1)
- detector (1)
- dimuon (1)
- dislocation (1)
- e+e − annihilation (1)
- e+e⁻ − Experiments (1)
- e+e− Experiments (1)
- e-scooter (1)
- effective lens position (1)
- effectiveness (1)
- elderly (1)
- electric and acustic stymulation (1)
- electric scooter (1)
- electron-positron collision (1)
- embolization (1)
- erectile dysfunction (1)
- experimental results (1)
- exponential model (1)
- external fixation (1)
- fibrosis imaging (1)
- fibrotest (1)
- flow cytometry (1)
- fracture (1)
- hadron spectroscopy (1)
- hadronic events (1)
- haemophilia A (1)
- head-and-neck cancer (1)
- heavy ion experiments (1)
- heavy-ion storage rings (1)
- helicity amplitude analysis (1)
- hemodynamic instability (1)
- hemorrhage (1)
- hepatitis C (1)
- high-risk neuroblastoma (1)
- immune reconstitution (1)
- inclusive J/ψ decays (1)
- induced membrane (1)
- interoperability (1)
- intrinsically disordered region (1)
- inverse kinematics (1)
- lactate (1)
- lapatinib (1)
- learning loss (1)
- lung cancer (1)
- mTOR inhibitor (1)
- management (1)
- membrane proteins (1)
- metastasis (1)
- metastatic prostate cancer (1)
- mindfulness (1)
- molecular machines (1)
- molecular tug-of-war (1)
- mortality (1)
- myocardial fibrosis (1)
- neoadjuvant therapy (1)
- neutron-induced reactions (1)
- non-ST-segment elevation acute coronary syndrome (1)
- non-invasive fibrosis assessment (1)
- nonstructural proteins (1)
- non‐selective beta‐blocker (1)
- nuclear cardiology (1)
- number of J/ψ events (1)
- oxLDL (1)
- p53 pathway (1)
- pIOL (1)
- pelvic injury (1)
- pelvic ring fracture (1)
- peptide editing (1)
- peptide-loading complex (1)
- photoacid (1)
- phylogeny (1)
- plasma-derived factor VIII concentrate, prophylaxis (1)
- point shear wave elastography (1)
- portal hypertension (1)
- primary active transporters (1)
- primary immunodeficiency (PID) (1)
- proteomics (1)
- proton transfer (1)
- pseudoexfoliative syndrome (1)
- psychotherapy process (1)
- quality control (1)
- quark gluon plasma (1)
- randomized controlled trial (RCT) (1)
- registry for primary immunodeficiency (1)
- resectability (1)
- risk group (1)
- scaffold size (1)
- scar (1)
- school closure (1)
- seed and soil (1)
- sequence alignment (1)
- smart home (1)
- smart living (1)
- spectra (1)
- sphingolipid (1)
- spinal bone metastasis (1)
- spine (1)
- spiro compounds (1)
- stage migration (1)
- structural biology (1)
- structural proteins (1)
- student achievement (1)
- surrogate reactions (1)
- survival (1)
- systematic review (1)
- tapasin (1)
- tetraquark (1)
- therapeutic alliance (1)
- traffic accident (1)
- transient elastography (1)
- transportation (1)
- trastuzumab (1)
- traumatic brain injury (1)
- trigger efficiency (1)
- ultrafast spectroscopy (1)
- vertebroplasty (1)
- web of things (1)
- x-ray techniques (1)
- Λ+c baryon (1)
- Σ hyperon (1)
- ψ(3686) (1)
- √sN N = 2.76 TeV (1)
Institute
- Physik (1393)
- Frankfurt Institute for Advanced Studies (FIAS) (960)
- Informatik (925)
- Medizin (106)
- ELEMENTS (18)
- Geowissenschaften (10)
- Biochemie und Chemie (5)
- Exzellenzcluster Herz-Lungen-System (3)
- Informatik und Mathematik (3)
- Biochemie, Chemie und Pharmazie (2)
Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay Λc⁺ → pη′
(2022)
The singly Cabibbo suppressed decay Λ+c→pη′ is measured using 4.5 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. Evidence for Λ+c→pη′ with a statistical significance of 3.6σ is reported with a double-tag approach. The Λ+c→pη′ absolute branching fraction is determined to be (5.62+2.46−2.04±0.26)×10−4, where the first and second uncertainties are statistical and systematic, respectively. Our result is consistent with the branching fraction obtained by the Belle collaboration within the uncertainty of 1σ.
Measurement of the absolute branching fraction of the singly Cabibbo suppressed decay Λc⁺ → pη′
(2022)
The singly Cabibbo suppressed decay Λ+c→pη′ is measured using 4.5 fb−1 of e+e− collision data collected at center-of-mass energies between 4.600 and 4.699 GeV with the BESIII detector at BEPCII. Evidence for Λ+c→pη′ with a statistical significance of 3.6σ is reported with a double-tag approach. The Λ+c→pη′ absolute branching fraction is determined to be (5.62+2.46−2.04±0.26)×10−4, where the first and second uncertainties are statistical and systematic, respectively. Our result is consistent with the branching fraction obtained by the Belle collaboration within the uncertainty of 1σ.
Using data samples with an integrated luminosity of 6.4~fb−1 collected by the BESIII detector operating at the BEPCII storage ring, the process of e+e−→γϕJ/ψ is studied. The processes of e+e−→ϕχc1,c2, χc1,c2→γJ/ψ are observed with a significance of more than 10σ. The s√-dependent cross section of e+e−→ϕχc1,c2 is measured between 4.600 and 4.951~GeV, and evidence of a resonance structure is found for the first time in the ϕχc2 process. We also search for the processes of e+e−→γX(4140), γX(4274) and γX(4500) via the γϕJ/ψ final state, but no obvious structures are found. The upper limits on the production cross section times the branching fraction for these processes at the 90% confidence level are reported.
Using a data sample corresponding to an integrated luminosity of 11.3 fb−1 collected at center-of-mass energies from 4.23 to 4.70 GeV with the BESIII detector, we observe the process e+e− → π0π0ψ2(3823) for the first time with a statistical significance of 6.0 standard deviations. The ratio of average cross sections for e+e− → π0π0ψ2(3823) and π+π−ψ2(3823) is determined to be R = σ[e+e− → π0π0ψ2(3823)] σ[e+e−→π+π−ψ2(3823)] = 0.57 ± 0.14 ± 0.05, which is consistent with expectations from isospin symmetry. Here and below, the first uncertainties are statistical and the second are systematic. The mass of the ψ2(3823) is measured to be M[ψ2(3823)] = 3824.5±2.4±1.0 MeV/c2. Due to the limited data sample, an upper limit of 18.8 MeV at 90% confidence level is set on the intrinsic width of ψ2(3823).
Using (448.1 ± 2.9) × 106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, the decay ψ(3686) → Σ⁻Σ‾⁺ is observed for the first time with a branching fraction of (2.82 ± 0.04stat. ± 0.08syst.) × 10−4, and the angular parameter αΣ− is measured to be 0.96 ± 0.09stat. ± 0.03syst..
Using an 𝑒+𝑒− collision data sample of (27.08±0.14)×108 𝜓(3686) events collected by the BESIII detector, we report the first observation of 𝜒𝑐𝐽→Ω−¯Ω+ (𝐽=0, 1, 2) decays with significances of 5.6𝜎, 6.4𝜎, and 18𝜎, respectively, where the 𝜒𝑐𝐽 mesons are produced in the radiative 𝜓(3686) decays. The branching fractions are determined to be ℬ(𝜒𝑐0→Ω−¯Ω+) = (3.51±0.54±0.29)×10−5, ℬ(𝜒𝑐1→Ω−¯Ω+)=(1.49±0.23±0.10)×10−5, and ℬ(𝜒𝑐2→Ω−¯Ω+)=(4.52±0.24±0.18)×10−5, where the first and second uncertainties are statistical and systematic, respectively.
The Ξ0 asymmetry parameters are measured using entangled quantum Ξ0 − Ξ¯ 0 pairs from a sample of ð448.1 2.9Þ × 106 ψð3686Þ events collected with the BESIII detector at BEPCII. The relative phase between the transition amplitudes of the Ξ0Ξ¯ 0 helicity states is measured to be ΔΦ ¼ −0.050 0.150 0.020 rad, which implies that there is no obvious polarization at the current level of statistics. The decay parameters of the Ξ0 hyperon ðαΞ0 ; αΞ¯ 0 ; ϕΞ0 ; ϕΞ¯ 0 Þ and the angular distribution parameter ½αψð3686Þ and ΔΦ are measured simultaneously for the first time. In addition, the CP asymmetry observables are determined to be AΞ0 CP ¼ ðαΞ0 þ αΞ¯ 0 Þ=ðαΞ0 − αΞ¯ 0 Þ ¼ −0.007 0.082 0.025 and ΔϕΞ0 CP ¼ ðϕΞ0 þ ϕΞ¯ 0 Þ=2 ¼ −0.079 0.082 0.010 rad, which are consistent with CP conservation.
Using (10.087±0.044)×109 𝐽/𝜓 events collected by the Beijing Spectrum III (BESIII) detector at the Beijing Electron Positron Collider II (BEPCII) collider, we search for the hyperon semileptonic decay Ξ−→Ξ0𝑒−¯𝜈𝑒. No significant signal is observed and the upper limit on the branching fraction ℬ(Ξ−→Ξ0𝑒−¯𝜈𝑒) is set to be 2.59×10−4 at 90% confidence level. This result is one order of magnitude more strict than the previous best limit.
Using a data sample corresponding to an integrated luminosity of 2.93 fb−1 collected at a center-of-mass energy √𝑠=3.773 GeV by the BESIII detector, the decay 𝐷0→𝜔𝜙 is observed for the first time. The branching fraction is measured to be (6.48±0.96±0.40)×10−4 with a significance of 6.3𝜎, where the first and second uncertainties are statistical and systematic, respectively. An angular analysis reveals that the 𝜙 and 𝜔 mesons from the 𝐷0→𝜔𝜙 decay are transversely polarized. The 95% confidence level upper limit on longitudinal polarization fraction is set to be less than 0.24, which is inconsistent with current theoretical expectations and challenges our understanding of the underlying dynamics in charm meson decays.
Using 6.32 fb−1 of electron-positron collision data recorded by the BESIII detector at center-of-mass energies between 4.178 and 4.226~GeV, we present the first search for the decay D+s→a0(980)0e+νe, a0(980)0→π0η, which could proceed via a0(980)-f0(980) mixing. No significant signal is observed. An upper limit of 1.2×10−4 at the 90% confidence level is set on the product of the branching fractions of D+s→a0(980)0e+νe and a0(980)0→π0η decays.
The decays D → K−π+π+π− and D → K−π+π 0 are studied in a sample of quantum-correlated DD¯ pairs produced through the process e+e− → ψ(3770) → DD¯, exploiting a data set collected by the BESIII experiment that corresponds to an integrated luminosity of 2.93 fb−1 . Here D indicates a quantum superposition of a D0 and a D¯ 0 meson. By reconstructing one neutral charm meson in a signal decay, and the other in the same or a different final state, observables are measured that contain information on the coherence factors and average strong-phase differences of each of the signal modes. These parameters are critical inputs in the measurement of the angle γ of the Unitarity Triangle in B− → DK− decays at the LHCb and Belle II experiments. The coherence factors are determined to be RK3π = 0.52+0.12−0.10 and RKππ0 = 0.78 ± 0.04, with values for the average strong-phase differences that are δ K3π D = (167+31−19)◦ and δKππ0D = (196+14−15◦ , where the uncertainties include both statistical and systematic contributions. The analysis is re-performed in four bins of the phase-space of the D → K−π+π+π− to yield results that will allow for a more sensitive measurement of γ with this mode, to which the BESIII inputs will contribute an uncertainty of around 6◦.
We report new measurements of the branching fraction ℬ(𝐷+𝑠→ℓ+𝜈), where ℓ+ is either 𝜇+ or 𝜏+(→𝜋+¯𝜈𝜏), based on 6.32 fb−1 of electron-positron annihilation data collected by the BESIII experiment at six center-of-mass energy points between 4.178 and 4.226 GeV. Simultaneously floating the 𝐷+𝑠→𝜇+𝜈𝜇 and 𝐷+𝑠→𝜏+𝜈𝜏 components yields ℬ(𝐷+𝑠→𝜏+𝜈𝜏)=(5.21±0.25±0.17)×10−2, ℬ(𝐷+𝑠→𝜇+𝜈𝜇)=(5.35±0.13±0.16)×10−3, and the ratio of decay widths 𝑅=Γ(𝐷+𝑠→𝜏+𝜈𝜏)Γ(𝐷+𝑠→𝜇+𝜈𝜇)=9.73+0.61−0.58±0.36, where the first uncertainties are statistical and the second systematic. No evidence of 𝐶𝑃 asymmetry is observed in the decay rates 𝐷±𝑠→𝜇±𝜈𝜇 and 𝐷±𝑠→𝜏±𝜈𝜏: 𝐴𝐶𝑃(𝜇±𝜈)=(−1.2±2.5±1.0)% and 𝐴𝐶𝑃(𝜏±𝜈)=(+2.9±4.8±1.0)%. Constraining our measurement to the Standard Model expectation of lepton universality (𝑅=9.75), we find the more precise results ℬ(𝐷+𝑠→𝜏+𝜈𝜏)=(5.22±0.10±0.14)×10−2 and 𝐴𝐶𝑃(𝜏±𝜈𝜏)=(−0.1±1.9±1.0)%. Combining our results with inputs external to our analysis, we determine the 𝑐→¯𝑠 quark mixing matrix element, 𝐷+𝑠 decay constant, and ratio of the decay constants to be |𝑉𝑐𝑠|=0.973±0.009±0.014, 𝑓𝐷+𝑠=249.9±2.4±3.5 MeV, and 𝑓𝐷+𝑠/𝑓𝐷+=1.232±0.035, respectively.
Using 2.93 fb−1 of e+e− collision data taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, the observation of the D0→K1(1270)−e+νe semileptonic decay is presented. The statistical significance of the decay D0→K1(1270)−e+νe is greater than 10σ. The branching fraction of D0→K1(1270)−e+νe is measured to be (1.09±0.13+0.09−0.13±0.12)×10−3. Here, the first uncertainty is statistical, the second is systematic, and the third originates from the assumed branching fraction of K1(1270)−→K−π+π−.
Using 2.93 fb−1 of e+e− collision data taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, the observation of the D0→K1(1270)−e+νe semileptonic decay is presented. The statistical significance of the decay D0→K1(1270)−e+νe is greater than 10σ. The branching fraction of D0→K1(1270)−e+νe is measured to be (1.09±0.13+0.09−0.16±0.12)×10−3. Here, the first uncertainty is statistical, the second is systematic, and the third originates from the assumed branching fraction of K1(1270)−→K−π+π−. The fraction of longitudinal polarization in D0→K1(1270)−e+νe is determined for the first time to be 0.50±0.19stat±0.08syst.
Using 6.32 fb−1 of 𝑒+𝑒− collision data collected by the BESIII detector at the center-of-mass energies between 4.178 and 4.226 GeV, an amplitude analysis of the 𝐷+𝑠→𝐾0𝑆𝐾−𝜋+𝜋+ decays is performed for the first time to determine the intermediate-resonant contributions. The dominant component is the 𝐷+𝑠→𝐾*(892)+¯𝐾*(892)0 decay with a fraction of (40.6±2.9stat±4.9sys)%. Our results of the amplitude analysis are used to obtain a more precise measurement of the branching fraction of the 𝐷+𝑠→𝐾0𝑆𝐾−𝜋+𝜋+ decay, which is determined to be (1.46±0.05stat±0.05sys)%.
Ten hadronic final states of the ℎ𝑐 decays are investigated via the process 𝜓(3686)→𝜋0ℎ𝑐, using a data sample of (448.1±2.9)×106 𝜓(3686) events collected with the BESIII detector. The decay channel ℎ𝑐→𝐾+𝐾−𝜋+𝜋−𝜋0 is observed for the first time and has a measured significance of 6.0𝜎. The corresponding branching fraction is determined to be ℬ(ℎ𝑐→𝐾+𝐾−𝜋+𝜋−𝜋0)=(3.3±0.6±0.6)×10−3 (where the uncertainties are statistical and systematic, respectively). Evidence for the decays ℎ𝑐→𝜋+𝜋−𝜋0𝜂 and ℎ𝑐→𝐾0𝑆𝐾±𝜋∓𝜋+𝜋− is found with a significance of 3.6𝜎 and 3.8𝜎, respectively. The corresponding branching fractions (and upper limits) are obtained to be ℬ(ℎ𝑐→𝜋+𝜋−𝜋0𝜂)=(7.2±1.8±1.3)×10−3 (<1.8×10−2) and ℬ(ℎ𝑐→𝐾0𝑆𝐾±𝜋∓𝜋+𝜋−)=(2.8±0.9±0.5)×10−3 (<4.7×10−3). Upper limits on the branching fractions for the final states ℎ𝑐→𝐾+𝐾−𝜋0, 𝐾+𝐾−𝜂, 𝐾+𝐾−𝜋+𝜋−𝜂, 2(𝐾+𝐾−)𝜋0, 𝐾+𝐾−𝜋0𝜂, 𝐾0𝑆𝐾±𝜋∓, and 𝑝¯𝑝𝜋0𝜋0 are determined at a confidence level of 90%.
Using a dedicated data sample taken in 2018 on the J/ψ peak, we perform a detailed study of the trigger efficiencies of the BESIII detector. The efficiencies are determined from three representative physics processes, namely Bhabha scattering, dimuon production and generic hadronic events with charged particles. The combined efficiency of all active triggers approaches 100% in most cases, with uncertainties small enough not to affect most physics analyses.
Observation of a near-threshold structure in the K⁺ recoil-mass spectra in e⁺e⁻ → K⁺(Dₛ⁻D*⁰+Dₛ*⁻D⁰)
(2021)
We report a study of the processes of 𝑒+𝑒−→𝐾+𝐷−𝑠𝐷*0 and 𝐾+𝐷*−𝑠𝐷0 based on 𝑒+𝑒− annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7 fb−1. An excess of events over the known contributions of the conventional charmed mesons is observed near the 𝐷−𝑠𝐷*0 and 𝐷*−𝑠𝐷0 mass thresholds in the 𝐾+ recoil-mass spectrum for events collected at √𝑠=4.681 GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8
−2.6±2.1) MeV/𝑐2 and (12.8+5.3−4.4±3.0) MeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3 𝜎 over the contributions only from the conventional charmed mesons. This is the first candidate for a charged hidden-charm tetraquark with strangeness, decaying into 𝐷−𝑠𝐷*0 and 𝐷*−𝑠𝐷0. However, the properties of the excess need further exploration with more statistics.
We report a study of the processes of e+e−→K+(D−sD∗0+D∗−sD0) based on e+e− annihilation samples collected with the BESIII detector operating at BEPCII at five center-of-mass energies ranging from 4.628 to 4.698 GeV with a total integrated luminosity of 3.7 fb−1. An excess over the known contributions of the conventional charmed mesons is observed near the D−sD∗0 and D∗−sD0 mass thresholds in the K+ recoil-mass spectrum for events collected at s√=4.681 GeV. The structure matches a mass-dependent-width Breit-Wigner line shape, whose pole mass and width are determined as (3982.5+1.8−2.6±2.1) MeV/c2 and (12.8+5.3−4.4±3.0) MeV, respectively. The first uncertainties are statistical and the second are systematic. The significance of the resonance hypothesis is estimated to be 5.3 σ over the pure contributions from the conventional charmed mesons. This is the first candidate of the charged hidden-charm tetraquark with strangeness, decaying into D−sD∗0 and D∗−sD0. However, the genuine properties of the excess need further exploration with more statistics.