Refine
Year of publication
Document Type
- Preprint (747)
- Article (647)
- Doctoral Thesis (8)
- Working Paper (7)
- Part of Periodical (5)
- Conference Proceeding (3)
- Part of a Book (2)
Has Fulltext
- yes (1419)
Is part of the Bibliography
- no (1419)
Keywords
- Heavy Ion Experiments (21)
- BESIII (19)
- e +-e − Experiments (16)
- Branching fraction (12)
- Hadron-Hadron scattering (experiments) (12)
- Particle and Resonance Production (9)
- Hadron-Hadron Scattering (8)
- Quarkonium (8)
- new species (7)
- Charm Physics (6)
- China (6)
- LHC (6)
- Spectroscopy (6)
- taxonomy (6)
- Hadronic decays (5)
- Heavy-ion collision (5)
- Heavy-ion collisions (5)
- QCD (5)
- Branching fractions (4)
- Charmonium (4)
- Collective Flow (4)
- Electroweak interaction (4)
- Exotics (4)
- Lepton colliders (4)
- Quark-Gluon Plasma (4)
- ALICE (3)
- Charmed mesons (3)
- Diffraction (3)
- Elastic scattering (3)
- Experimental nuclear physics (3)
- Experimental particle physics (3)
- Heavy Quark Production (3)
- Initial state radiation (3)
- Jets (3)
- Jets and Jet Substructure (3)
- Particle and resonance production (3)
- Polarization (3)
- RHIC (3)
- e+-e− Experiments (3)
- new genus (3)
- new synonymy (3)
- ALICE experiment (2)
- Absolute branching fraction (2)
- Beam Energy Scan (2)
- Bhabha (2)
- Charm physics (2)
- Chinesisch (2)
- Chiral Magnetic Effect (2)
- Collectivity (2)
- Consolidation (2)
- Correlation (2)
- Cross section (2)
- Electroencephalography – EEG (2)
- Electroweak Interaction (2)
- Flavour Physics (2)
- Hadronic cross section (2)
- Hemiptera (2)
- Kollision (2)
- Konsumentenkredit (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Leptonic, semileptonic & radiative decays (2)
- Leukemias (2)
- Mountain (2)
- Muon anomaly (2)
- Non-REM sleep (2)
- Oriental Region (2)
- Oriental region (2)
- Particle Correlations and Fluctuations (2)
- Particle correlations and fluctuations (2)
- Particle decays (2)
- Pion form factor (2)
- Quark–gluon plasma (2)
- Radiative decay (2)
- STAR (2)
- Shear viscosity (2)
- Stenothemus (2)
- Tibet (2)
- Tipulinae (2)
- Xyloperthini (2)
- collision (2)
- crane flies (2)
- decays (2)
- key (2)
- lectotype (2)
- new synonym (2)
- pp collisions (2)
- 3' UTR (1)
- 900 GeV (1)
- ADHD (1)
- Acacia mearnsii (1)
- Acute lymphoblastic leukemia (1)
- Aedes aegypti (1)
- Aedes albopictus (1)
- Afrotropical Region (1)
- Afrotropical region (1)
- Alien invasive species (1)
- Alleles (1)
- Amintinus gambianus (1)
- Analytical chemistry (1)
- Anaplectinae (1)
- Angular distribution (1)
- Animal behavior (1)
- Annihilation (1)
- Antiteilchen (1)
- Antlion (1)
- Aortic valve (1)
- Aphis fabae (1)
- Apoptosis (1)
- Atherosclerosis (1)
- Atomic and molecular interactions with photons (1)
- B cell receptor (1)
- B-slope (1)
- BESIII detector (1)
- BGD (1)
- Bacchini (1)
- Banking (1)
- Beam energy scan (1)
- Beauty production (1)
- Beliefs (1)
- Biochemistry (1)
- Biodiversity (1)
- Biogeography (1)
- Biophysical chemistry (1)
- Biosecurity (1)
- Boosted Jets (1)
- Born cross section (1)
- Born cross section measurement (1)
- Borrowing (1)
- Brain (1)
- Branching fraction measurement (1)
- C. gorohovi Sivec & Stark, 2010 (1)
- COI (1)
- COI gene (1)
- COVID-19 (1)
- CP violation (1)
- Calophagus (1)
- Cancer chemotherapy (1)
- Cancer models (1)
- Cancer treatment (1)
- Canonical suppression (1)
- Cardiovascular diseases (1)
- Cell biology (1)
- Cell proliferation (1)
- Charged-particle multiplicity (1)
- Charm quark spatial diffusion coefficient (1)
- Charm vector (1)
- Charmed baryon (1)
- Charmonia (1)
- Charmonium (-like) (1)
- Chemical equilibration (1)
- Chemical physics (1)
- Chemische Gleichgewichtherstellung (1)
- Chikungunya (1)
- Chikungunya virus (1)
- Chinoperla changjiangensis sp. nov. (1)
- Chiral magnetic effect (1)
- Chiroticina (1)
- Chiton (1)
- Chrysidoidea (1)
- Cicadellidae (1)
- Climate (1)
- Coalescence (1)
- Cold nuclear matter effects (1)
- Collective Flow, (1)
- Compact astrophysical objects (1)
- Comparison with QCD (1)
- Computational biology and bioinformatics (1)
- Consumer Credit (1)
- Consumer Finance (1)
- Consumer credit (1)
- Consumption (1)
- Consumption-Saving (1)
- Course (1)
- Covariance matrix (1)
- Credit Cards (1)
- Critical point (1)
- Croatia (1)
- Cross section measurements (1)
- Cryoelectron microscopy (1)
- Cybertaxonomy (1)
- D meson (1)
- D0 and D+ mesons (1)
- DNA barcodes (1)
- Dali (1)
- Dalitz decay (1)
- Dark photon (1)
- Dark sector (1)
- Decision making (1)
- Dengue (1)
- Dengue virus (1)
- Deuteron (1)
- Deuteron production (1)
- Di-hadron correlations (1)
- Diagnosis (1)
- Dialekt (1)
- Diseases (1)
- Drosophila melanogaster (1)
- Drug screens (1)
- Dynamical chiral symmetry breaking (1)
- Dyson–Schwinger equations (1)
- D⁰ meson (1)
- E-democracy (1)
- Eastern Palaearctic (1)
- Ectrichodiini (1)
- Effective form factor (1)
- Electromagnetic amplitude (1)
- Electromagnetic form factor (1)
- Electromagnetic form factors (1)
- Elliptic flow (1)
- Embryos (1)
- Endosomes (1)
- Endothelial cells (1)
- Epilepsy (1)
- EpilepsyNon-REM sleep (1)
- Expectations (1)
- FOS: Physical sciences (1)
- Femtoscopy (1)
- Fermion–gauge-boson vertex (1)
- Filariasis (1)
- FinTech (1)
- Financial literacy (1)
- Fiscal Policy (1)
- Fish (1)
- Flavor changing neutral currents (1)
- Flavor symmetries (1)
- Flow (1)
- Flow cytometry (1)
- Form factors (1)
- Formative experiences (1)
- Forward physics (1)
- Frankliniella occidentalis (1)
- Free-electron lasers (1)
- GCSC-BtA (1)
- GMYC (1)
- Galaxies and clusters (1)
- Gan–Dou–Fu–Mu decoction (GDFMD) (1)
- Genetic engineering (1)
- Genetic transduction (1)
- Genetics (1)
- Geologie (1)
- Geology (1)
- Germany (1)
- Geschichte (1)
- Groomed jet radius (1)
- HBT (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hadronization (1)
- Hadrons (1)
- Haematococcus pluvialis (1)
- Hard Scattering (1)
- Health risk analysis (1)
- Heart (1)
- Heavy Ion Experiment (1)
- Heavy flavor (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ion collisions (1)
- Heavy ion storage ring (1)
- Heavy-Ion Collision (1)
- Heavy-flavor decay electron (1)
- Heavy-ion (1)
- Helicity amplitude analysis (1)
- Hematology (1)
- High Energy Physics - Experiment (hep-ex) (1)
- High altitude (1)
- High-energy astrophysics (1)
- Higher moments (1)
- Himalayas (1)
- Hindu Kush Himalayas (1)
- Homeostasis (1)
- Hyperons (1)
- Image processing (1)
- Immunostaining (1)
- Inclusive branching fraction (1)
- Inclusive spectra (1)
- Incommensurability (1)
- Industrie-Cluster (1)
- Infectious diseases (1)
- Information Age (1)
- Institution und Technologie (1)
- Integrins (1)
- Intensity interferometry (1)
- Interference fragmentation function (1)
- Invisible decays (1)
- Italy (1)
- J/ψ suppression (1)
- Jet Physics (1)
- Jet Substructure (1)
- Jet substructure (1)
- K0S (1)
- Kashmir (1)
- Klassifikator <Linguistik> (1)
- Klima (1)
- Ko-Evolution (1)
- Korrelation (1)
- Kreditkarte (1)
- LASSO (1)
- LPS (1)
- Leishmaniasis (1)
- Leukaemia (1)
- Life-Cycle Model (1)
- Liquidity Constraints (1)
- Malaise trap (1)
- Malaria (1)
- Material budget (1)
- Melanostomini (1)
- Membrane lipids (1)
- Menghai (1)
- Messenger RNA (1)
- Meteorologie (1)
- Meteorology (1)
- Mid-rapidity (1)
- Miridae (1)
- Molecular medicine (1)
- Mollusca (1)
- Mosquito (1)
- Mouse models (1)
- Multi-Parton Interactions (1)
- Multi-strange baryons (1)
- Multiple parton interactions (1)
- Multiple sclerosis (1)
- Musculoskeletal abnormalities (1)
- Myocardial infarction (1)
- Net-charge correlations (1)
- Net-charge fluctuations (1)
- Neutrinos (1)
- Nominalphrase (1)
- Nonflow (1)
- Nuclear modification factor (1)
- Octodesmus (1)
- Octomeristes gen. nov. (1)
- Oncology (1)
- Oocytes (1)
- Orbital electron capture (1)
- Oriental (1)
- Oriental fauna (1)
- Outcome (1)
- Ovaries (1)
- PRG-1 (1)
- PYTHIA (1)
- Paraxylion (1)
- Paraxylogenes (1)
- Particle phenomena (1)
- Particle production (1)
- Pb–Pb (1)
- Permanent-Income Hypothesis (1)
- Personality (1)
- Personality differences (1)
- Personality traits (1)
- Phase (1)
- Phospholipids (1)
- Phylogenomics (1)
- Physiological parameters (1)
- Plesioxylion (1)
- Polyplacophora (1)
- Poverty (1)
- Produktion von pentaquark (1)
- Properties of Hadrons (1)
- Protein translation (1)
- Proton (1)
- Proton-proton collisions (1)
- Proton–proton (1)
- Proton–proton collisions (1)
- Psoriasis (1)
- Psoriatic arthritis (1)
- Pyralidae (1)
- Quality of life (1)
- Quantum chromodynamics (1)
- Quantum electrodynamics (1)
- Quark Deconfinement (1)
- Quark Gluon Plasma (1)
- Quark Production (1)
- R value (1)
- RNA PT (1)
- RNA modification (1)
- RNA-sequencing (1)
- RUFY (1)
- Rare decays (1)
- Relativistic heavy-ion collisions (1)
- Resonances (1)
- Risk taking (1)
- Rugosimirax (1)
- Sandfly (1)
- Sarkoplasmatisches Retikulum ; Calcium ; ATP ; Wechselwirkung (1)
- Saving (1)
- Scale (1)
- Self-control (1)
- Semi-leptonic decays (1)
- Sequence motif analysis (1)
- Shanghai (1)
- Sichuan (1)
- Single electrons (1)
- Single muons (1)
- Single particle decay spectroscopy (1)
- Skp (1)
- SoftDrop (1)
- Sparen (1)
- Spin alignment (1)
- Splitting function (1)
- Staphylinidae (1)
- Strangeness enhancement (1)
- Stratigraphie (1)
- Stratigraphy (1)
- Stroke (1)
- Strong amplitude (1)
- Sweden (1)
- Swimming (1)
- Syrphinae (1)
- Tas2r126 (1)
- Tas2r135 (1)
- Tas2r143 (1)
- Tax Cuts (1)
- Tax Rebates (1)
- Techniques Electromagnetic calorimeters (1)
- Tetranychus cinnabarinus (1)
- Theoretical chemistry (1)
- Thermal model (1)
- Threshold effect (1)
- Topik (1)
- Townostilpnus (1)
- Traditional Chinese Medicine (1)
- Transverse momentum (1)
- Transversity (1)
- Treatment (1)
- Triple quarkonia (1)
- Two body weak decay (1)
- Vector Boson Production (1)
- Verbrauch (1)
- Vergleichbarkeit (1)
- Vestiplex (1)
- W-exchange (1)
- Wilson disease (WD) (1)
- Windfalls (1)
- Wissenschaft (1)
- X-ray crystallography (1)
- Xylothrips (1)
- Y (4260) (1)
- Y states (1)
- Zika virus (1)
- acute lymphoblastic leukemia (1)
- adalimumab (1)
- alderflies (1)
- alleles (1)
- alveolar macrophages (1)
- anticoagulation (1)
- antiparticles (1)
- apoptosis (1)
- arabidopsis thaliana (1)
- astaxanthin (1)
- atrial fibrillation (1)
- autism spectrum disorder (1)
- autistic disorder (1)
- b-carotene ketolase (1)
- baicalein (1)
- banana pathogen (1)
- bioactive phospholipids (1)
- biodiversity (1)
- biodiversity conservation (1)
- biospeleology (1)
- birdstrike prevention (1)
- branching fractions (1)
- carotenoid (1)
- caves (1)
- cell motility (1)
- center-of-mass energy (1)
- charmed baryon (1)
- charmonium-like states (1)
- chemosensory cells (1)
- chemotherapeutics-treated (1)
- climate change (1)
- clinical trial (1)
- control (1)
- copy number polymorphism (1)
- cortical network (1)
- creativity (1)
- data integration (1)
- decay (1)
- desmoplastic stroma (1)
- detector (1)
- deuteron (1)
- diagnosis and treatment (1)
- digestion artifact (1)
- dimuon (1)
- diphoton (1)
- dobsonflies (1)
- drought (1)
- e+e − annihilation (1)
- e+e⁻ − Experiments (1)
- e+e− Experiments (1)
- e+e− annihilation (1)
- ecological impact (1)
- electron-positron collision (1)
- experimental results (1)
- fishflies (1)
- flora (1)
- gene sequence data (1)
- genes (1)
- genetics (1)
- genome (1)
- genotype (1)
- genotype determination (1)
- geometric morphometrics (1)
- hadron spectroscopy (1)
- hadronic events (1)
- head-to-head (1)
- heavy Hagedorn states (1)
- heavy ion experiments (1)
- heavy-ion collisions (1)
- helicity amplitude analysis (1)
- herbarium specimens (1)
- high energie (1)
- high-throughput sequencing (1)
- hohe Energie (1)
- hypoxia (1)
- identification key (1)
- inclusive J/ψ decays (1)
- industrial cluster (1)
- institution and technology (1)
- integrins (1)
- invasive alien species (1)
- isohydricity (1)
- ixekizumab (1)
- job non‐routinization (1)
- lacewings (1)
- leaf water potential (1)
- left atrial appendage occlusion (1)
- luminosity (1)
- lung cancer (1)
- lymphangioleiomyomatosis (1)
- machine learning (1)
- macrophages (1)
- male genitalia (1)
- management (1)
- management strategy (1)
- mass spectrometry (1)
- micro-CT (1)
- microRNA (1)
- mitophagy (1)
- molecular systematics (1)
- morphological variation (1)
- network centrality (1)
- network visualization (1)
- new combination (1)
- new combinations (1)
- new distribution (1)
- new status (1)
- new taxa (1)
- new taxon (1)
- newly diagnosed glioblastoma (1)
- nivolumab (1)
- nucleoside analysis (1)
- number of J/ψ events (1)
- numerical analyses (1)
- online borrowing (1)
- organic thin films (1)
- organizational identification (1)
- p+p collisions (1)
- pairwise connectedness (1)
- pancreatic cancer (1)
- parasitoids (1)
- phenotype (1)
- plant invasion (1)
- plant-hydraulics (1)
- portable electronic nose (1)
- production of pentaquark (1)
- prognosis (1)
- psoriatic arthritis (1)
- psychiatric disorders (1)
- quark gluon plasma (1)
- radiotherapy (1)
- redescription (1)
- reinstatement (1)
- review (1)
- revision (1)
- schwere Hagedorn Zustände (1)
- selenolates (1)
- self-assembled monolayers (1)
- shell eyes (1)
- single nucleotide polymorphism (1)
- slug-eating snakes (1)
- social identity theory (1)
- space-momentum correlation (1)
- spectra (1)
- stroke (1)
- structural biology (1)
- support vector machine (1)
- synapse (1)
- synomyny (1)
- synonymy (1)
- temozolomide (1)
- tetraquark (1)
- thiolates (1)
- time-lapse imaging (1)
- total connectedness (1)
- total directional connect- edness (1)
- toxic milk mice (TX mice) (1)
- traditional Chinese medicine (TCM) (1)
- transformational leadership (1)
- transitional society (1)
- trigger efficiency (1)
- triptycene (1)
- tuft cells (1)
- unmethylated MGMT (1)
- variance decomposition (1)
- vector autoregression (1)
- vessel density (1)
- water stress (1)
- wine (1)
- yellow Sigatoka (1)
- Λ+c baryon (1)
- Λc⁺ (1)
- Σ hyperon (1)
- Υ suppression (1)
- ψ(3686) (1)
- √sN N = 2.76 TeV (1)
Institute
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 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 7.93 fb−1 of e+e− collision data collected at the center-of-mass energy of 3.773 GeV with the BESIII detector, we measure the absolute branching fractions of D0→K−e+νe, D0→K−μ+νμ, D+→K¯0e+νe, and D+→K¯0μ+νμ to be (3.509±0.009stat.±0.013syst.)%, (3.408±0.011stat.±0.013syst.)%, (8.856±0.039stat.±0.078syst.)%, and (8.661±0.046stat.±0.080syst.)%, respectively. By performing a simultaneous fit to the partial decay rates of these four decays, the product of the hadronic form factor fK+(0) and the modulus of the c→s CKM matrix element |Vcs| is determined to be fK+(0)|Vcs|=0.7162±0.0011stat.±0.0012syst.. Taking the value of |Vcs|=0.97349±0.00016 from the standard model global fit or that of fK+(0)=0.7452±0.0031 from the LQCD calculation as input, we derive the results fK+(0)=0.7357±0.0011stat.±0.0012syst. and |Vcs|=0.9611±0.0015stat.±0.0016syst.±0.0040LQCD.
Using 9.0 fb−1 of e+e− collision data collected at center-of-mass energies from 4.178 to 4.278 GeV with the BESIII detector at the BEPCII collider, we perform the first search for the radiative transition χc1(3872)→γψ2(3823). No χc1(3872)→γψ2(3823) signal is observed. The upper limit on the ratio of branching fractions B(χc1(3872)→γψ2(3823),ψ2(3823)→γχc1)/B(χc1(3872)→π+π−J/ψ) is set as 0.075 at the 90\% confidence level. Our result contradicts theoretical predictions under the assumption that the χc1(3872) is the pure charmonium state χc1(2P).
Observation of a vector charmoniumlike state at 4.7 GeV/c² and search for Zcₛ in e⁺e⁻ → K⁺K⁻J/ψ
(2023)
Using data samples with an integrated luminosity of 5.85~fb−1 collected at center-of-mass energies from 4.61 to 4.95 GeV with the BESIII detector operating at the BEPCII storage ring, we measure the cross section for the process e+e−→K+K−J/ψ. A new resonance with a mass of M=4708+17−15±21 MeV/c2 and a width of Γ=126+27−23±30 MeV is observed in the energy-dependent line shape of the e+e−→K+K−J/ψ cross section with a significance over 5σ. The K+J/ψ system is also investigated to search for charged charmoniumlike states, but no significant Z+cs states are observed. Upper limits on the Born cross sections for e+e−→K−Zcs(3985)+/K−Zcs(4000)++c.c. with Zcs(3985)±/Zcs(4000)±→K±J/ψ are reported at 90\% confidence levels. The ratio of branching fractions B(Zcs(3985)+→K+J/ψ)B(Zcs(3985) +→ (D¯0D∗+s+D¯∗0D+s)) is measured to be less than 0.03 at 90\% confidence level.
The processes hc→γP(P=η′, η, π0) are studied with a sample of (27.12±0.14)×108 ψ(3686) events collected by the BESIII detector at the BEPCII collider. The decay hc→γη is observed for the first time with the significance of 9.0σ, and the branching fraction is determined to be (3.77±0.55±0.13±0.26)×10−4, while B(hc→γη′) is measured to be (1.40±0.11±0.04±0.10)×10−3, where the first uncertainties are statistical, the second systematic, and the third from the branching fraction of ψ(3686)→π0hc. The combination of these results allows for a precise determination of Rhc=B(hc→γη)B(hc→γη′), which is calculated to be (27.0±4.4±1.0)%. The results are valuable for gaining a deeper understanding of η−η′ mixing, and its manifestation within quantum chromodynamics. No significant signal is found for the decay hc→γπ0, and an upper limit is placed on its branching fraction of B(hc→γπ0)<5.0×10−5, at the 90% confidence level.
Using (2.712±0.014)×109 ψ(3686) events collected with the BESIII detector operating at the BEPCII, we find an evidence of the ηc(2S)→K+K−η′ decay with a statistical significance of 3.1σ. Its decay branching fraction is measured to be (12.24±4.60(stat.)±2.37(syst.)±4.68(extr.))×10−4, where the first uncertainty is statistical, the second is systematic, and the third uncertainty is from the branching fraction of the ψ(3686)→γηc(2S) decay. The upper limit on the product branching fraction B[ψ(3686)→γηc(2S)]× B[ηc(2S)→K+K−η′] is set to be 1.14×10−6 at 90% confidence level. In addition, the branching fractions of χc1→K+K−η′ and χc2→K+K−η′ are updated to be (8.47±0.09(stat.)±0.47(syst.))×10−4 and (1.53±0.04(stat.)±0.08(syst.))×10−4, respectively. The precision is improved by twofold.
Using e+e− annihilation data sets corresponding to an integrated luminosity of 4.5 fb−1, collected with the BESIII detector at center-of-mass energies between 4.600 and 4.699 GeV, we report the first measurements of the absolute branching fractions B(Λ+c→pK0L)=(1.67±0.06±0.04)%, B(Λ+c→pK0Lπ+π−)=(1.69±0.10±0.05)%, and B(Λ+c→pK0Lπ0)=(2.02±0.13±0.05)%, where the first uncertainties are statistical and the second systematic. Combining with the known branching fractions of Λ+c→pK0S, Λ+c→pK0Sπ+π−, and Λ+c→pK0Sπ0, we present the first measurements of the K0S-K0L asymmetries R(Λ+c,K0S,LX)=B(Λ+c→K0SX)−B(Λ+c→K0LX)B(Λ+c→K0SX)+B(Λ+c→K0LX) in charmed baryon decays: R(Λ+c,pK0S,L)=−0.025±0.031, R(Λ+c,pK0S,Lπ+π−)=−0.027±0.048, and R(Λ+c,pK0S,Lπ0)=−0.015±0.046. No significant asymmetries within the uncertainties are observed.
Based on 368.5 pb−1 of 𝑒+𝑒− collision data collected at center-of-mass energies 4.914 and 4.946 GeV by the BESIII detector, the 𝑒+𝑒−→𝜙𝜒𝑐1(3872) process is searched for the first time. No significant signal is observed and the upper limits at the 90% confidence level on the product of the Born cross section 𝜎(𝑒+𝑒−→𝜙𝜒𝑐1(3872)) and the branching fraction ℬ[𝜒𝑐1(3872)→𝜋+𝜋−𝐽/𝜓] at 4.914 and 4.946 GeV are set to be 0.85 and 0.96 pb, respectively. These measurements provide useful information for the production of the 𝜒𝑐1(3872) at 𝑒+𝑒− colliders and deepen our understanding about the nature of this particle.
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 (2712.4±14.3)×106 ψ(3686) events, we investigate four hadronic decay modes of the P-wave charmonium spin-singlet state hc(1P1)→h+h−π0/η (h=π or K) via the process ψ(3686)→π0hc at BESIII. The hc→π+π−π0 decay is observed with a significance of 9.6σ after taking into account systematic uncertainties. Evidences for hc→K+K−π0 and hc→K+K−η are found with significances of 3.5σ and 3.3σ, respectively, after considering the systematic uncertainties. The branching fractions of these decays are measured to be B(hc→π+π−π0)=(1.36±0.16±0.14)×10−3, B(hc→K+K−π0)=(3.26±0.84±0.36)×10−4, and B(hc→K+K−η)=(3.13±1.08±0.38)×10−4, where the first uncertainties are statistical and the second are systematic. No significant signal of hc→π+π−η is found, and the upper limit of its decay branching fraction is determined to be B(hc→π+π−η)<4.0×10−4 at 90% confidence level.
Using data samples with an integrated luminosity of 4.67 fb−1 collected by the BESIII detector operating at the BEPCII collider, we search for the process e+e−→η′ψ(2S) at center-of-mass energies from 4.66 to 4.95 GeV. No significant signal is observed, and upper limits for the Born cross sections σB(e+e−→η′ψ(2S)) at the 90\% confidence level are determined.
We report the first amplitude analysis of the decays D0→π+π−η and D+→π+π0η using a data sample taken with the BESIII detector at the center-of-mass energy of 3.773 GeV, corresponding to an integrated luminosity of 7.9 fb−1. The contribution from the process D0(+)→a0(980)+π−(0) is significantly larger than the D0(+)→a0(980)−(0)π+ contribution. The ratios B(D0→a0(980)+π−)/B(D0→a0(980)−π+) and B(D+→a0(980)+π0)/B(D+→a0(980)0π+) are measured to be 7.5+2.5−0.8stat.±1.7syst. and 2.6±0.6stat.±0.3syst., respectively. The measured D0 ratio disagrees with the theoretical predictions by orders of magnitudes, thus implying a substantial contribution from final-state interactions.
The process e+e−→pp¯π0 is studied at 20 center-of-mass energies ranging from 2.1000 to 3.0800 GeV using 636.8 pb−1 of data collected with the BESIII detector operating at the BEPCII collider. The Born cross sections for e+e−→pp¯π0 are measured with high precision. Since the lowest center-of-mass energy, 2.1000 GeV, is less than 90 MeV above the pp¯π0 energy threshold, we can probe the threshold behavior for this reaction. However, no anomalous threshold enhancement is found in the cross sections for e+e−→pp¯π0.
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.
Based on (2.712±0.014)×109 ψ(3686) events collected by the BESIII collaboration, evidence of the hadronic decay hc→K0SK+π−+c.c. is found with a significance of 4.3σ in the ψ(3686)→π0hc process. The branching fraction of hc→K0SK+π−+c.c. is measured to be (7.3±0.8±1.8)×10−4, where the first and second uncertainties are statistical and systematic, respectively. Combining with the exclusive decay width of ηc→KK¯π, our result indicates inconsistencies with both pQCD and NRQCD predictions.
Six C-even states, denoted as X, with quantum numbers JPC=0−+, 1±+, or 2±+, are searched for via the e+e−→γD±sD∗∓s process using (1667.39±8.84) pb−1 of e+e− collision data collected with the BESIII detector operating at the BEPCII storage ring at center-of-mass energy of s√=(4681.92±0.30) MeV. No statistically significant signal is observed in the mass range from 4.08 to 4.32 GeV/c2. The upper limits of σ[e+e−→γX]⋅B[X→D±sD∗∓s] at a 90% confidence level are determined.
The processes hc→γP(P=η′, η, π0)) are studied with a sample of (27.12±0.14)×108 ψ(3686) events collected by the BESIII detector at the BEPCII collider. The branching fractions of hc→γη′ and hc→γη are measured to be (1.40±0.11±0.04±0.10)×10−3 and (3.77±0.55±0.13±0.26)×10−4, respectively, where the first uncertainties are statistical, the second systematic, and the third from the branching fraction of ψ(3686)→π0hc. The ratio Rhc=B(hc→γη)B(hc→γη′) is calculated to be (27.0±4.4±1.0)%. The measurements are consistent with the previous results with improved precision by a factor of 2. The results are valuable for gaining a deeper understanding of η−η′ mixing, and its manifestation within quantum chromodynamics. No significant signal is found for the decay hc→γπ0, and an upper limit is placed on its branching fraction of B(hc→γπ0)<5.0×10−5, at the 90\% confidence level.
Observation of χcJ → 3(K⁺K⁻)
(2023)
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.
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.