Refine
Year of publication
Document Type
- Article (518)
- Preprint (307)
- Conference Proceeding (3)
- Part of Periodical (2)
Has Fulltext
- yes (830)
Is part of the Bibliography
- no (830)
Keywords
- e +-e − Experiments (15)
- BESIII (12)
- Branching fraction (10)
- LHC (9)
- Particle and Resonance Production (8)
- Quarkonium (7)
- Charm Physics (6)
- Spectroscopy (6)
- Heavy-ion collisions (5)
- ALICE experiment (4)
- Exotics (4)
- Jets (4)
- Lepton colliders (4)
- Quasi-free scattering (4)
- ALICE (3)
- Charmed mesons (3)
- Diffraction (3)
- Elastic scattering (3)
- Electroweak interaction (3)
- Experimental nuclear physics (3)
- Experimental particle physics (3)
- Hadron-Hadron Scattering (3)
- Hadronic decays (3)
- Inverse kinematics (3)
- Polarization (3)
- Psychiatric disorders (3)
- Spectroscopic factors (3)
- e+-e− Experiments (3)
- pp collisions (3)
- AML (2)
- Abdominal aortic aneurysm (2)
- Abdominelles Aortenaneurysma (2)
- Beam Energy Scan (2)
- Beauty production (2)
- Branching fractions (2)
- COVID-19 (2)
- Calorimeters (2)
- Charm physics (2)
- Charmonium (2)
- Chiral Magnetic Effect (2)
- Collectivity (2)
- Correlation (2)
- Decorin (2)
- Diagnostik (2)
- Electroweak Interaction (2)
- Elliptic flow (2)
- Endovascular repair (2)
- Endovaskuläre Behandlung (2)
- Flavour Physics (2)
- Früherkennung (2)
- HIV (2)
- Heavy Ions (2)
- Heavy-Ion Collision (2)
- IR-A (2)
- Klinische Ergebnisse (2)
- Leptonic, semileptonic & radiative decays (2)
- Mammakarzinom (2)
- Nachsorge (2)
- Offene Versorgung (2)
- Open repair (2)
- Particle decays (2)
- Pb–Pb collisions (2)
- Proliferation (2)
- QCD (2)
- Quark-Gluon Plasma (2)
- RHIC (2)
- Radiative decay (2)
- Register (2)
- Registry (2)
- Richtlinie (2)
- STAR (2)
- Shear viscosity (2)
- Shell model (2)
- Signaling (2)
- Single electrons (2)
- Single-particle states (2)
- Suicide (2)
- Treatment outcome (2)
- breast cancer (2)
- diagnosis (2)
- follow‑up (2)
- guideline (2)
- screening (2)
- 16 segment AHA model (1)
- 900 GeV (1)
- ALICE detector (1)
- ALL (1)
- Absolute branching fraction (1)
- Adverse drug reaction (1)
- Alternative oxidase (1)
- Amitriptyline (1)
- Animal personality (1)
- Anti-nuclei (1)
- Anticholinergic (1)
- Antiretroviral therapy (1)
- B-slope (1)
- BESIII detector (1)
- Beam energy scan (1)
- Behavioral reaction norms (1)
- Behavioral specialization (1)
- Behavioral syndromes (1)
- Behavioral type (1)
- Bhabha (1)
- Biogeography (1)
- Biologging (1)
- Biological (1)
- Bipolar disorder (1)
- Born cross section (1)
- Born cross section measurement (1)
- Branching fraction measurement (1)
- CDI (1)
- CP violation (1)
- CVID (1)
- Calorimeter methods (1)
- Canonical suppression (1)
- Cardiovascular magnetic resonance (1)
- Charged-particle multiplicity (1)
- Charm quark spatial diffusion coefficient (1)
- Charm vector (1)
- Charmed baryon (1)
- Charmonia (1)
- Charmonium (-like) (1)
- Children (1)
- Chiral magnetic effect (1)
- Circadian (1)
- Clinical genetics (1)
- Closure (1)
- Coalescence (1)
- Cold nuclear matter effects (1)
- Comparison with QCD (1)
- Critical point (1)
- Cross section (1)
- Cross sections (1)
- D meson (1)
- DST (1)
- Dark photon (1)
- Dark sector (1)
- Data sharing (1)
- Detector design and construction technologies and materials (1)
- Detector modelling and simulations I (interaction of radiation with matter, interaction of photons with matter, interaction of hadrons with matter, etc) (1)
- Deuteron production (1)
- Di-hadron correlations (1)
- Direct nuclear reactions (1)
- Direct reactions (1)
- Drug susceptibility testing (1)
- Ecology (1)
- Ecophysiology (1)
- Effective form factor (1)
- Elderly (1)
- Electromagnetic form factor (1)
- Electromagnetic form factors (1)
- Electron-pion identification (1)
- European Society for Immunodeficiencies (ESID) (1)
- FOS: Physical sciences (1)
- Fc receptor (1)
- Femtoscopy (1)
- Fibre/foam sandwich radiator (1)
- First-line combination antiretroviral therapy (1)
- Fistula (1)
- Flavor changing neutral currents (1)
- Flavor symmetries (1)
- Florida (1)
- Flow (1)
- Form factors (1)
- Forward physics (1)
- GWAS (1)
- Generation Y (1)
- Genetics (1)
- German PID-NET registry (1)
- Groomed jet radius (1)
- Guidelines (1)
- HBT (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-Hadron scattering (experiments) (1)
- Hadron-hadron interactions (1)
- Hadronization (1)
- Heavy Ion Experiment (1)
- Heavy Ion Experiments (1)
- Heavy Quark Production (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ion collisions (1)
- Heavy-flavor decay electron (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion (1)
- Helicity amplitude analysis (1)
- High Energy Physics - Experiment (hep-ex) (1)
- High-energy neutron detection (1)
- Higher moments (1)
- Human behaviour (1)
- Hyperons (1)
- IgG substitution therapy (1)
- Immunogenetics (1)
- Immunology (1)
- Inclusive branching fraction (1)
- Inclusive spectra (1)
- Induction chemotherapy (1)
- Influenza (1)
- Initial state radiation (1)
- Intensity interferometry (1)
- Interference fragmentation function (1)
- Intra-abdominal infection (1)
- Invisible decays (1)
- Ionisation energy loss (1)
- J/ψ suppression (1)
- Jet substructure (1)
- Jets and Jet Substructure (1)
- K0S (1)
- Kidney (1)
- Laparostomy (1)
- M. Intracellulare (1)
- M. avium (1)
- M. avium complex (1)
- M. chimaera (1)
- MLL (1)
- Mesh (1)
- Meta-analysis (1)
- Mid-rapidity (1)
- Mitochondria (1)
- Mitochondrial disease (1)
- Molecular neuroscience (1)
- Monitoring (1)
- Multi-neutron detection (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Multimedication (1)
- Multimorbidity (1)
- Multiple parton interactions (1)
- Multiple-indication review (1)
- Mycobacteria (1)
- Mycobacterium avium complex (1)
- Myocardial perfusion (1)
- Myocardial segmentation (1)
- NMR spectroscopy (1)
- NTM (1)
- Neolithic (1)
- Net-charge correlations (1)
- Net-charge fluctuations (1)
- Neural network (1)
- Neutrinos (1)
- Non-trauma (1)
- Non-tuberculous mycobacteria (1)
- Nonflow (1)
- Nontuberculous mycobacteria (1)
- Nuclear modification factor (1)
- Nuclear reactions (1)
- Nuclear structure & decays (1)
- Nucleon induced nuclear reactions (1)
- Nutrition (1)
- One-nucleon removal (1)
- Open abdomen (1)
- Opportunistic infections (1)
- PID prevalence (1)
- PYTHIA (1)
- Pancreatitis (1)
- Pandemic (1)
- Parainfluenza (1)
- Particle and resonance production (1)
- Particle phenomena (1)
- Particle production (1)
- Pb–Pb (1)
- Performance of High Energy Physics Detectors (1)
- Peritonitis (1)
- Personalized medicine (1)
- Plastic scintillator array (1)
- Pneumonia (1)
- Polypharmacy (1)
- Pre-treatment drug resistance mutations (1)
- Predictability (1)
- Predictive markers (1)
- Properties of Hadrons (1)
- Protease inhibitor therapy (1)
- Proton (1)
- Proton-proton collisions (1)
- Proton–proton (1)
- Proton–proton collisions (1)
- Psychiatry (1)
- Quantum chromodynamics (1)
- Quark Gluon Plasma (1)
- Quark Production (1)
- Quark–gluon plasma (1)
- RNA, long noncoding (1)
- Rare decays (1)
- Re-exploration (1)
- Reactions with relativistic radioactive beams (1)
- Reintervention (1)
- Relativistic heavy-ion collisions (1)
- Resonances (1)
- Respiratory chain (1)
- Respiratory infections (1)
- Respiratory syncytial virus (1)
- SARS-CoV-2 (1)
- Seasonal variation (1)
- Semi-leptonic decays (1)
- Side effects (1)
- Single muons (1)
- SoftDrop (1)
- Solar insolation (1)
- Spectroscopic factors & electromagnetic moments (1)
- Spin alignment (1)
- Splitting function (1)
- Stink bug (1)
- Strangeness enhancement (1)
- Sub-segmentation (1)
- Sunlight (1)
- Superinfection (1)
- Synthetic (1)
- TR (1)
- Technique (1)
- Techniques Electromagnetic calorimeters (1)
- Thermal model (1)
- Threshold effect (1)
- Timing (1)
- Tracking (1)
- Transition radiation detector (1)
- Transverse momentum (1)
- Transversity (1)
- Trauma (1)
- Trigger (1)
- Upper respiratory tract infection (1)
- Vascular emergencies (1)
- Vector Boson Production (1)
- Virological failure (1)
- Xenon-based gas mixture (1)
- Y states (1)
- accessory proteins (1)
- acute leukemia (1)
- adaptive cardiac remodelling (1)
- adenocarcinoma (1)
- age (1)
- age-related macular degeneration (1)
- alleles (1)
- alternative oxidase (1)
- angiogenesis (1)
- angiopoietin-2 (1)
- antiepileptic drugs (1)
- autism spectrum disorder (1)
- autistic disorder (1)
- biomarker (1)
- cardiac ischaemia‐reperfusion (1)
- cell-free protein synthesis (1)
- center-of-mass energy (1)
- charmonium-like states (1)
- children and adolescents (1)
- chromosomal translocations (1)
- chronic kidney disease (1)
- cohort study (1)
- copy number polymorphism (1)
- dE/dx (1)
- decays (1)
- decision aids (1)
- dimuon (1)
- distress (1)
- distribution (1)
- domestication (1)
- e+e − annihilation (1)
- e+e⁻ − Experiments (1)
- e+e− Experiments (1)
- economy (1)
- ectosomes (1)
- electron transport chain (1)
- electron-positron collision (1)
- epigenomics (1)
- evolution (1)
- excitation transport (1)
- exosomes (1)
- extracellular vesicles (1)
- first record (1)
- gender (1)
- gene flow (1)
- genes (1)
- genetic generalized epilepsy (1)
- genetics (1)
- genome (1)
- genotype (1)
- genotype determination (1)
- germ cell tumors (1)
- glioblastoma (1)
- global change (1)
- guidelines (1)
- habitat destruction (1)
- hadron spectroscopy (1)
- hadronic events (1)
- heavy-ion collisions (1)
- helicity amplitude analysis (1)
- histology (1)
- hypertension, pulmonary (1)
- inclusive J/ψ decays (1)
- interferon regulatory factor 9 (IRF9) (1)
- intrinsically disordered region (1)
- lamotrigine (1)
- land use (1)
- levetiracetam (1)
- light harvesting networks (1)
- light–energy conversion (1)
- lung cancer (1)
- microparticles (1)
- microvesicles (1)
- minimal information requirements (1)
- mouse (1)
- neovascularization, physiologic (1)
- new host record (1)
- non-ST-segment elevation acute coronary syndrome (1)
- nonstructural proteins (1)
- number of J/ψ events (1)
- open quantum systems (1)
- ovary (1)
- p+p collisions (1)
- pharmacoresistance (1)
- phenotype (1)
- primary immunodeficiency (PID) (1)
- quantum transport (1)
- reactive oxygen species (1)
- registry for primary immunodeficiency (1)
- reproducibility (1)
- rigor (1)
- semiconductors (1)
- sex (1)
- single nucleotide polymorphism (1)
- spectra (1)
- standardization (1)
- structural proteins (1)
- surgery (1)
- testis (1)
- tetraquark (1)
- translocation partner genes (1)
- trigger efficiency (1)
- tumor microenvironment (TME) (1)
- type I interferons (IFNs) (1)
- valproic acid (1)
- vascular endothelial growth factor (1)
- versican (VCAN) (1)
- work-life balance (1)
- working conditions (1)
- Λ+c baryon (1)
- Σ hyperon (1)
- Υ suppression (1)
- ψ(3686) (1)
- √sN N = 2.76 TeV (1)
Institute
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.
Using a data sample of (10087±44)×106 J/ψ events collected by the BESIII detector in 2009, 2012, 2018 and 2019, the electromagnetic Dalitz process J/ψ→e+e−η(1405) is observed via the decay η(1405)→π0f0(980), f0(980)→π+π−, with a significance of about 9.6σ. The branching fraction of this decay is measured to be B(J/ψ→e+e−π0η(1405)→e+e−π0f0(980)→e+e−π0π+π−)=(2.02±0.24(stat.)±0.09(syst.))×10−7. The branching-fraction ratio B(J/ψ→e+e−η(1405))/B(J/ψ→γη(1405)) is determined to be (1.35±0.19(stat.)±0.06(syst.))×10−2. Furthermore, an e+e− invariant-mass dependent transition form factor of J/ψ→e+e−η(1405) is presented for the first time. The obtained result provides input for different theoretical models, and is valuable for the improved understanding the intrinsic structure of the η(1405) meson.
Based on data samples collected with the BESIII detector at the BEPCII collider, the process e+e−→Σ+Σ¯− is studied at center-of-mass energies s√ = 2.3960, 2.6454, and 2.9000~GeV. Using a fully differential angular description of the final state particles, the complete information of the Σ+ electromagnetic form factors in the time-like region is extracted. The relative phase between the electric and magnetic form factors is determined to be sinΔΦ = -0.67~±~0.29~(stat.)~±~0.18~(syst.) at s√ = 2.3960~GeV, ΔΦ = 55∘~±~19∘~(stat.) ±~14∘~(syst.) at s√ = 2.6454~GeV, and 78∘~±~22∘~(stat.) ±~9∘~(syst.) at s√ = 2.9000~GeV. For the first time, the phase of the hyperon electromagnetic form factors is explored in a wide range of four-momentum transfer. The evolution of the phase along with four-momentum transfer is an important input for understanding its asymptotic behavior and the dynamics of baryons.
Observation of χcJ → 3(K⁺K⁻)
(2024)
By analyzing (27.12±0.14)×108 𝜓(3686) events collected with the BESIII detector operating at the BEPCII collider, the decay processes 𝜒𝑐𝐽→3(𝐾+𝐾−) (𝐽=0, 1, 2) are observed for the first time with statistical significances of 8.2𝜎, 8.1𝜎, and 12.4𝜎, respectively. The product branching fractions of 𝜓(3686)→𝛾𝜒𝑐𝐽, 𝜒𝑐𝐽→3(𝐾+𝐾−) are presented and the branching fractions of 𝜒𝑐𝐽→3(𝐾+𝐾−) decays are determined to be ℬ𝜒𝑐0→3(𝐾+𝐾−)=(10.7±1.8±1.1)×10−6, ℬ𝜒𝑐1→3(𝐾+𝐾−)=(4.2±0.9±0.5)×10−6, and ℬ𝜒𝑐2→3(𝐾+𝐾−)=(7.2±1.1±0.8)×10−6, where the first uncertainties are statistical and the second are systematic.
Using e+e− collision data, corresponding to an integrated luminosity of 892pb−1 collected at center-of-mass energies from 4.84 to 4.95\,GeV with the BESIII detector, we search for the process e+e−→K+K−ψ(3770) by reconstructing two charged kaons and one D meson from ψ(3770). No significant signal of e+e−→K+K−ψ(3770) is found and the upper limits of the Born cross sections are reported at 90\% confidence level.
Using data samples collected with the BESIII detector operating at the BEPCII storage ring, the cross section of the inclusive process e+e−→η+X, normalized by the total cross section of e+e−→hadrons, is measured at eight center-of-mass energy points from 2.0000 GeV to 3.6710 GeV. These are the first measurements with momentum dependence in this energy region. Our measurement shows a significant discrepancy from calculations with the existing fragmentation functions. To address this discrepancy, a new QCD analysis is performed at the next-to-next-to-leading order with hadron mass corrections and higher twist effects, which can explain both the established high-energy data and our measurements reasonably well.
Based on data samples collected with the BESIII detector at the BEPCII collider, the process e+e−→Σ+Σ¯− is studied at center-of-mass energies s√ = 2.3960, 2.6454, and 2.9000 GeV. Using a fully differential angular description of the final state particles, both the relative magnitude and phase information of the Σ+ electromagnetic form factors in the timelike region are extracted. The relative phase between the electric and magnetic form factors is determined to be sinΔΦ = -0.67~±~0.29~(stat)~±~0.18~(syst) at s√ = 2.3960 GeV, ΔΦ = 55∘~±~19∘~(stat) ±~14∘~(syst) at s√ = 2.6454 GeV, and 78∘~±~22∘~(stat) ±~9∘~(syst) at s√ = 2.9000 GeV. For the first time, the phase of the hyperon electromagnetic form factors is explored in a wide range of four-momentum transfer. The evolution of the phase along with four-momentum transfer is an important input for understanding its asymptotic behavior and the dynamics of baryons.
Based on data samples collected with the BESIII detector at the BEPCII collider, the process e+e−→Σ+Σ¯− is studied at center-of-mass energies s√ = 2.3960, 2.6454, and 2.9000~GeV. Using a fully differential angular description of the final state particles, the complete information of the Σ+ electromagnetic form factors in the time-like region is extracted. The relative phase between the electric and magnetic form factors is determined to be sinΔΦ = -0.67~±~0.29~(stat.)~±~0.18~(syst.) at s√ = 2.3960~GeV, ΔΦ = 55∘~±~19∘~(stat.) ±~14∘~(syst.) at s√ = 2.6454~GeV, and 78∘~±~22∘~(stat.) ±~9∘~(syst.) at s√ = 2.9000~GeV. For the first time, the phase of the hyperon electromagnetic form factors is explored in a wide range of four-momentum transfer. The evolution of the phase along with four-momentum transfer is an important input for understanding its asymptotic behavior and the dynamics of baryons.
Using 𝑒+𝑒− collision data with an integrated luminosity of 7.33 fb−1 collected at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector operating at the BEPCII collider, the branching fraction of the leptonic decay 𝐷+ 𝑠→𝜇+𝜈𝜇 is measured to be (0.5294±0.0108stat±0.0085syst)%. Based on this, the product of the 𝐷+ 𝑠 decay constant 𝑓𝐷+ 𝑠 and the magnitude of the 𝑐→𝑠 quark mixing matrix element |𝑉𝑐𝑠| is determined to be 𝑓𝐷+ 𝑠|𝑉𝑐𝑠| = 241.8±2.5stat±2.2syst MeV. Using the value of |𝑉𝑐𝑠| given by the global standard model fit, 𝑓𝐷+ 𝑠 is found to be 248.4±2.5stat±2.2syst MeV. Alternatively, using the value of 𝑓𝐷+ 𝑠 from a recent lattice quantum chromodynamics calculation, |𝑉𝑐𝑠| is determined to be 0.968±0.010stat±0.009syst.
Using (10087±44)×106 J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021stat.±0.018syst.)×10−3, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be −0.652±0.056stat.±0.020syst.. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
Using (10087±44)×106 J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021stat.±0.018syst.)×10−3, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be −0.652±0.056stat.±0.020syst.. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
Using (10087±44)×106 J/ψ events collected with the BESIII detector, the radiative hyperon decay Σ→pγ is studied at an electron-positron collider experiment for the first time. The absolute branching fraction is measured to be (0.996±0.021stat.±0.018syst.)×10−3, which is lower than its world average value by 4.2 standard deviations. Its decay asymmetry parameter is determined to be −0.652±0.056stat.±0.020syst.. The branching fraction and decay asymmetry parameter are the most precise to date, and the accuracies are improved by 78% and 34%, respectively.
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.
Based on e+e− collision data collected at center-of-mass energies from 2.000 to 3.080 GeV by the BESIII detector at the BEPCII collider, a partial wave analysis is performed for the process e+e−→K0SK0Lπ0. The results allow the Born cross sections of the process e+e−→K0SK0Lπ0, as well as its subprocesses e+e−→K∗(892)0K¯ and K∗2(1430)0K¯ to be measured. The Born cross sections for e+e−→K0SK0Lπ0 are consistent with previous measurements by BaBar and SND, but with substantially improved precision. The Born cross section lineshape of the process e+e−→K∗(892)0K¯ is consistent with a vector meson state around 2.2 GeV with a statistical significance of 3.2σ. A Breit-Wigner fit determines its mass as MY=(2164.1±9.6±3.1) MeV/c2 and its width as ΓY=(32.4±21.1±1.5) MeV, where the first uncertainties are statistical and the second ones are systematic, respectively.
Based on e+e− collision data collected at center-of-mass energies from 2.000 to 3.080 GeV by the BESIII detector at the BEPCII collider, a partial wave analysis is performed for the process e+e−→K0SK0Lπ0. The results allow the Born cross sections of the process e+e−→K0SK0Lπ0, as well as its subprocesses e+e−→K∗(892)0K¯0 and K∗2(1430)0K¯0 to be measured. The Born cross sections for e+e−→K0SK0Lπ0 are consistent with previous measurements by BaBar, but with substantially improved precision. The Born cross section lineshape of the process e+e−→K∗(892)0K¯0 is consistent with a vector meson state around 2.2 GeV with a significance of 3.2σ. A Breit-Wigner fit determines its mass as MY=(2164.7±9.1±3.1) MeV/c2 and its width as ΓY=(32.4±21.0±1.8) MeV.
We measure the Born cross section for the reaction e+e−→ηhc from s√=4.129 to 4.600~GeV using data sets collected by the BESIII detector running at the BEPCII collider. A resonant structure in the cross section line shape near 4.200~GeV is observed with a statistical significance of 7σ. The parameters of this resonance are measured to be \MeasMass\ and \MeasWidth, where the first uncertainties are statistical and the second systematic.
Using (10087±44)×106 J/ψ events collected with the BESIII detector, numerous Ξ− and Λ decay asymmetry parameters are simultaneously determined from the process J/ψ→Ξ−Ξ¯+→Λ(pπ−)π−Λ¯(n¯π0)π+ and its charge-conjugate channel. The precisions of α0 for Λ→nπ0 and α¯0 for Λ¯→n¯π0 compared to world averages are improved by factors of 4 and 1.7, respectively. The ratio of decay asymmetry parameters of Λ→nπ0 to that of Λ→pπ−, ⟨α0⟩/⟨αΛ−⟩, is determined to be 0.873±0.012+0.011−0.010, where the first and the second uncertainties are statistical and systematic, respectively. The ratio is smaller than unity more than 5σ, which signifies the existence of the ΔI=3/2 transition in Λ for the first time. Beside, we test for CP violation in Ξ−→Λπ− and in Λ→nπ0 with the best precision to date.
Using (10087±44)×106 J/ψ events collected with the BESIII detector, numerous Ξ− and Λ decay asymmetry parameters are simultaneously determined from the process J/ψ→Ξ−Ξ¯+→Λ(pπ−)π−Λ¯(n¯π0)π+ and its charge-conjugate channel. The precisions of α0 for Λ→nπ0 and α¯0 for Λ¯→n¯π0 compared to world averages are improved by factors of 4 and 1.7, respectively. The ratio of decay asymmetry parameters of Λ→nπ0 to that of Λ→pπ−, ⟨α0⟩/⟨αΛ−⟩, is determined to be 0.873±0.012+0.011−0.010, where the first and the second uncertainties are statistical and systematic, respectively. The ratio is smaller than unity, which is predicted by the ΔI=1/2 rule, with a statistical significance of more than 5σ. We test for CP violation in Ξ−→Λπ− and in Λ→nπ0 with the best precision to date.
Based on 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 experimental studies of the doubly Cabibbo-suppressed decays 𝐷+𝑠→𝐾+𝐾+𝜋− and 𝐷+𝑠→𝐾+𝐾+𝜋−𝜋0 are reported. We determine the absolute branching fraction of 𝐷+𝑠→𝐾+𝐾+𝜋− to be (1.24+0.28−0.26(stat)±0.06(syst))×10−4. No significant signal of 𝐷+𝑠→𝐾+𝐾+𝜋−𝜋0 is observed and the upper limit on its decay branching fraction at 90% confidence level is set to be 1.7×10−4.