Refine
Year of publication
Language
- English (1750)
Has Fulltext
- yes (1750)
Is part of the Bibliography
- no (1750)
Keywords
- Heavy Ion Experiments (22)
- BESIII (20)
- e +-e − Experiments (20)
- Branching fraction (15)
- Hadron-Hadron Scattering (14)
- Hadron-Hadron scattering (experiments) (11)
- LHC (10)
- Particle and Resonance Production (10)
- Quarkonium (8)
- Charm Physics (6)
- Heavy-ion collision (6)
- Heavy-ion collisions (6)
- Jets (6)
- QCD (6)
- Spectroscopy (6)
- Hadronic decays (5)
- Heavy Quark Production (5)
- ALICE experiment (4)
- Branching fractions (4)
- Charm physics (4)
- Charmonium (4)
- Collective Flow (4)
- Electroweak interaction (4)
- Exotics (4)
- Lepton colliders (4)
- Quark-Gluon Plasma (4)
- ALICE (3)
- Charmed mesons (3)
- Electroweak Interaction (3)
- Experimental nuclear physics (3)
- Experimental particle physics (3)
- Heavy Ions (3)
- Initial state radiation (3)
- Jets and Jet Substructure (3)
- Monte Carlo (3)
- Particle and resonance production (3)
- Systematic Uncertainty (3)
- e+-e− Experiments (3)
- pp collisions (3)
- Absolute branching fraction (2)
- Beam Energy Scan (2)
- Beauty production (2)
- Bhabha (2)
- Chiral Magnetic Effect (2)
- Cross section (2)
- Elliptic flow (2)
- Flavour Physics (2)
- Hadronic cross section (2)
- Heavy-Ion Collision (2)
- Lepton-Nucleon Scattering (experiments) (2)
- Leptonic, semileptonic & radiative decays (2)
- Muon anomaly (2)
- Particle Correlations and Fluctuations (2)
- Particle correlations and fluctuations (2)
- Particle decays (2)
- Pb–Pb collisions (2)
- Pion form factor (2)
- Quark Gluon Plasma (2)
- Radiative decay (2)
- Single electrons (2)
- Time Projection Chamber (2)
- center-of-mass energy (2)
- decays (2)
- luminosity (2)
- 900 GeV (1)
- ALICE LHC (1)
- ALICE detector (1)
- Analysis and statistical methods (1)
- Angular distribution (1)
- Annihilation (1)
- Anti-nuclei (1)
- Azimuthal correlations (1)
- B-slope (1)
- BESIII detector (1)
- BSM particle (1)
- Balance function (1)
- Beam energy scan (1)
- Bhabha scattering (1)
- Boosted Jets (1)
- Born cross section (1)
- Born cross section measurement (1)
- Branching fraction measurement (1)
- CP violation (1)
- Calorimeters (1)
- Canonical suppression (1)
- Centrality Class (1)
- Centrality Selection (1)
- Charge correlations (1)
- Charged-particle density (1)
- Charm quark spatial diffusion coefficient (1)
- Charm vector (1)
- Charmed baryon (1)
- Charmonium (-like) (1)
- Chiral magnetic effect (1)
- Coalescence (1)
- Collective Flow, (1)
- Collectivity (1)
- Comparison with QCD (1)
- Correlation (1)
- Covariance matrix (1)
- Critical point (1)
- Cross section measurements (1)
- D meson (1)
- D0 and D+ mesons (1)
- Dalitz decay (1)
- Dark photon (1)
- Dark sector (1)
- Data processing methods (1)
- Deuteron production (1)
- Developmental biology (1)
- Diffraction (1)
- D⁰ meson (1)
- Effective form factor (1)
- Elastic scattering (1)
- Electromagnetic amplitude (1)
- Electromagnetic form factor (1)
- Electromagnetic form factors (1)
- Electron-pion identification (1)
- Extracellular matrix (1)
- FCNC process (1)
- Femtoscopy (1)
- Fibre/foam sandwich radiator (1)
- Flavor changing neutral currents (1)
- Flavor symmetries (1)
- Form factors (1)
- Genetics (1)
- Genome-wide association studies (1)
- HBT (1)
- Hadron production (1)
- Hadron-Hadron Scattering Heavy (1)
- Hadron-hadron interactions (1)
- Hadrons (1)
- Hard Scattering (1)
- Heavy Ion Experiment (1)
- Heavy flavor production (1)
- Heavy flavour production (1)
- Heavy ion collisions (1)
- Heavy ions (1)
- Heavy-flavor decay electron (1)
- Heavy-flavour decay muons (1)
- Heavy-flavour production (1)
- Heavy-ion detectors (1)
- Helicity amplitude analysis (1)
- Higher moments (1)
- Hyperon decay (1)
- Hyperons (1)
- Inclusive branching fraction (1)
- Inclusive spectra (1)
- Initial State Radiation (1)
- Intensity interferometry (1)
- Invariant Mass (1)
- Invariant Mass Distribution (1)
- Invisible decays (1)
- Ionisation energy loss (1)
- Jet Physics (1)
- Jet Substructure (1)
- K0S (1)
- Large Hadron Collider (1)
- Large detector systems for particle and astroparticle physics (1)
- Material budget (1)
- Mid-rapidity (1)
- Minimum Bias (1)
- Multi-Parton Interactions (1)
- Multi-strange baryons (1)
- Multi-wire proportional drift chamber (1)
- Neural network (1)
- Neutrinos (1)
- Nuclear modification factor (1)
- PYTHIA (1)
- Particle phenomena (1)
- Particle production (1)
- Pb–Pb (1)
- Performance of High Energy Physics Detectors (1)
- Phase (1)
- Polarization (1)
- Production Cross Section (1)
- Properties of Hadrons (1)
- Proton (1)
- Proton–proton (1)
- Proton–proton collisions (1)
- QGP (1)
- Quantum chromodynamics (1)
- Quark Deconfinement (1)
- Quark Production (1)
- Quark–gluon plasma (1)
- R value (1)
- Rapidity Range (1)
- Rare decays (1)
- Relativistic heavy ion physics (1)
- Relativistic heavy-ion collisions (1)
- Resolution Parameter (1)
- Resonances (1)
- Respiratory tract diseases (1)
- SARS-CoV-2 (1)
- STAR (1)
- Semi-leptonic decays (1)
- Semileptonic Decay (1)
- Shear viscosity (1)
- Single muons (1)
- Strangeness enhancement (1)
- Strong amplitude (1)
- TR (1)
- Techniques Electromagnetic calorimeters (1)
- Thermal model (1)
- Threshold effect (1)
- Tracking (1)
- Transition radiation detector (1)
- Transverse Momentum (1)
- Transverse momentum (1)
- Trigger (1)
- Triple quarkonia (1)
- Vector Boson Production (1)
- Viral infection (1)
- W-exchange (1)
- Wide rapidity coverage (1)
- Xenon-based gas mixture (1)
- Y (4260) (1)
- Y states (1)
- biodiversity hotspots (1)
- biogeography (1)
- branching fractions (1)
- charmed baryon (1)
- charmonium-like states (1)
- community assembly (1)
- conservation (1)
- dE/dx (1)
- decay (1)
- detector (1)
- dimuon (1)
- diphoton (1)
- diversity metrics (1)
- e+e − annihilation (1)
- e+e⁻ − Experiments (1)
- e+e− Experiments (1)
- e+e− annihilation (1)
- electron-positron collision (1)
- evolutionary history (1)
- experimental results (1)
- hadron spectroscopy (1)
- hadronic events (1)
- heavy ion experiments (1)
- heavy-ion collisions (1)
- helicity amplitude analysis (1)
- inclusive J/ψ decays (1)
- number of J/ψ events (1)
- phylogenetic diversity (1)
- prioritization (1)
- quark gluon plasma (1)
- radiative dimuon events (1)
- range size (1)
- spectra (1)
- tetraquark (1)
- trigger efficiency (1)
- Λ+c baryon (1)
- Λc⁺ (1)
- Σ hyperon (1)
- Υ suppression (1)
- ψ(3686) (1)
- √sN N = 2.76 TeV (1)
Institute
- Physik (1692)
- Frankfurt Institute for Advanced Studies (FIAS) (1092)
- Informatik (1007)
- Informatik und Mathematik (3)
- Geowissenschaften (2)
- Hochschulrechenzentrum (2)
- Medizin (2)
- Biochemie und Chemie (1)
- Biodiversität und Klima Forschungszentrum (BiK-F) (1)
- Biowissenschaften (1)
Using a data sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we present measurements of branching fractions for the decays χcJ→Σ+Σ¯− and Σ0Σ¯0. The decays χc1,2→Σ+Σ¯− and Σ0Σ¯0 are observed for the first time, and the branching fractions for χc0→Σ+Σ¯− and Σ0Σ¯0 decays are measured with improved precision. The branching fraction ratios between the charged and neutral modes are consistent with the prediction of isospin symmetry.
Using a data sample with an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy of 3.773 GeV, we search for the Majorana neutrino (𝜈𝑚) in the lepton number violating decays 𝐷→𝐾𝜋𝑒+𝑒+. No significant signal is observed, and the upper limits on the branching fraction at the 90% confidence level are set to be ℬ(𝐷0→𝐾−𝜋−𝑒+𝑒+)<2.8×10−6, ℬ(𝐷+→𝐾0𝑆𝜋−𝑒+𝑒+)<3.3×10−6 and ℬ(𝐷+→𝐾−𝜋0𝑒+𝑒+)<8.5×10−6. The Majorana neutrino is searched for with different mass assumptions ranging from 0.25 to 1.0 GeV/𝑐2 in the decays 𝐷0→𝐾−𝑒+𝜈𝑚,𝜈𝑚→𝜋−𝑒+ and 𝐷+→𝐾0𝑆𝑒+𝜈𝑚,𝜈𝑚→𝜋−𝑒+, and the upper limits on the branching fraction at the 90% confidence level are at the level of 10−7∼10−6, depending on the mass of the Majorana neutrino. The constraints on the mixing matrix element |𝑉𝑒𝜈𝑚|2 are also evaluated.
The cross section of the process e+e−→K+K− is measured at a number of center-of-mass energies s√ from 2.00 to 3.08 GeV with the BESIII detector at the Beijing Electron Positron Collider (BEPCII). The results provide the best precision achieved so far. A resonant structure around 2.2 GeV is observed in the cross section line shape. A Breit-Wigner fit yields a mass of M=2239.2±7.1±11.3~and a width of Γ=139.8±12.3±20.6 MeV, where the first uncertainties are statistical and the second ones are systematic. In addition, the time-like electromagnetic form factor of the kaon is determined at the individual center-of-mass energy points.
Using a data sample of 𝑒+𝑒− collisions corresponding to an integrated luminosity of 567 pb−1 collected at a center-of-mass energy of √𝑠=4.6 GeV with the BESIII detector, we measure the absolute branching fraction of the inclusive semileptonic Λ+𝑐 decay with a double-tag method. We obtain ℬ(Λ+𝑐→𝑋𝑒+𝜈𝑒)=(3.95±0.34±0.09)%, where the first uncertainty is statistical and the second systematic. Using the known Λ+𝑐 lifetime and the charge-averaged semileptonic decay width of nonstrange charmed mesons (𝐷0 and 𝐷+), we obtain the ratio of the inclusive semileptonic decay widths Γ(Λ+𝑐→𝑋𝑒+𝜈𝑒)/¯Γ(𝐷→𝑋𝑒+𝜈𝑒)=1.26±0.12.
Using a sample of 4.48×108 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we study the two-photon decays of the pseudoscalar mesons π0, η, η′, η(1405), η(1475), η(1760), and X(1835) in J/ψ radiative decays using ψ(3686)→π+π−J/ψ events. The π0, η and η′ mesons are clearly observed in the two-photon mass spectra, and the branching fractions are determined to be B(J/ψ→γπ0→3γ)=(3.57±0.12±0.16)×10−5, B(J/ψ→γη→3γ)=(4.42±0.04±0.18)×10−4, and B(J/ψ→γη′→3γ)=(1.26±0.02±0.05)×10−4, where the first errors are statistical and the second systematic. No clear signal for η(1405), η(1475), η(1760) or X(1835) is observed in the two-photon mass spectra, and upper limits at the 90% confidence level on the product branching fractions are obtained.
The baryonic decay D+s→pn¯ is observed, and the corresponding branching fraction is measured to be (1.21±0.10±0.05)×10−3, where the first uncertainty is statistical and second systematic. The data sample used in this analysis was collected with the BESIII detector operating at the BEPCII e+e− double-ring collider with a center-of-mass energy of 4.178~GeV and an integrated luminosity of 3.19~fb−1. The result confirms the previous measurement by the CLEO Collaboration and is of greatly improved precision, which may deepen our understanding of the dynamical enhancement of the W-annihilation topology in the charmed meson decays.
We search for rare decays of D mesons to hadrons accompany with an electron-positron pair (h(h')e+e−), using an e+e− collision sample corresponding to an integrated luminosity of 2.93 fb−1 collected with the BESIII detector at s√ = 3.773 GeV. No significant signals are observed, and the corresponding upper limits on the branching fractions at the 90% confidence level are determined. The sensitivities of the results are at the level of 10−5∼10−6, providing a large improvement over previous searches.
Based on a data sample of (448.1±2.9)×106 ψ(3686) decays collected with the BESIII experiment, a search for the flavor changing neutral current transition ψ(3686) → Λ+cp¯¯¯e+e−+c.c. is performed for the first time. No signal candidates are observed and the upper limit on the branching fraction of ψ(3686) → Λ+cp¯¯¯e+e− is determined to be 1.7×10−6 at the 90\% confidence level. The result is consistent with expectations from the Standard Model, and no evidence for new physics is found.
Using a data sample of 448.1 × 106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, we report the first observation of the electromagnetic Dalitz decay ψ(3686) → η e+e−, with significances of 7.0σ and 6.3σ when reconstructing the η meson via its decay modes η → γπ+π− and η → π+π−η (η → γγ ), respectively. The weighted average branching fraction is determined to be B(ψ(3686) → η e+e−) = (1.90 ± 0.25 ± 0.11) × 10−6, where the first uncertainty is statistical and the second systematic.
We report the first measurements of absolute branching fractions for the W -exchange-only processes + c → 0K + and + c → (1530)0K + with the double-tag technique, by analyzing an e+e− collision data sample, that corresponds to an integrated luminosity of 567 pb−1 collected at a center-of-mass energy of 4.6 GeV by the BESIII detector. The branching fractions are measured to be B(+c → 0K +) = (5.90 ± 0.86 ± 0.39) × 10−3 and B(+c → (1530)0K +) = (5.02 ± 0.99 ± 0.31) × 10−3, where the first uncertainties are statistical and the second systematic. Our results are more precise than the previous relative measurements.
Using a data sample of e+e− collision data corresponding to an integrated luminosity of 2.93 fb−1 collected with the BESIII detector at a center-of-mass energy of s=3.773GeV, we search for the singly Cabibbo-suppressed decays D0→π0π0π0, π0π0η, π0ηη and ηηη using the double tag method. The absolute branching fractions are measured to be B(D0→π0π0π0)=(2.0±0.4±0.3)×10−4, B(D0→π0π0η)=(3.8±1.1±0.7)×10−4 and B(D0→π0ηη)=(7.3±1.6±1.5)×10−4 with the statistical significances of 4.8σ, 3.8σ and 5.5σ, respectively, where the first uncertainties are statistical and the second ones systematic. No significant signal of D0→ηηη is found, and the upper limit on its decay branching fraction is set to be B(D0→ηηη)<1.3×10−4 at the 90% confidence level.
The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair √sNN = 5.02 TeV with the J/ψ produced in the central rapidity region |y| < 0.8,
which corresponds to the small Bjorken-x range (0.3 − 1.4) × 10−3.
The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x.
ϒ production and nuclear modification at forward rapidity in Pb–Pb collisions at √sNN = 5.02TeV
(2021)
The production of ϒ mesons in Pb–Pb collisions at a centre-of-mass energy per nucleon pair √sNN = 5.02 TeV is measured with the muon spectrometer of the ALICE detector at the LHC. The yields as well as the nuclear modification factors are determined in the forward rapidity region 2.5 < y < 4.0, as a function of rapidity, transverse momentum and collision centrality. The results show that the production of the ϒ(1S) meson is suppressed by a factor of about three with respect to the production in proton–proton collisions. For the first time, a significant signal for the ϒ(2S) meson is observed at forward rapidity, indicating a suppression stronger by about a factor 2–3 with respect to the ground state. The measurements are compared with transport, hydrodynamic, comover and statistical hadronisation model calculations.
The first measurement of the coherent photoproduction of ρ0 vector mesons in ultra-peripheral Xe–Xe collisions at √sNN = 5.44 TeV is presented. This result, together with previous HERA γ p data and γ –Pb measurements from ALICE, describes the atomic number (A) dependence of this process, which is particularly sensitive to nuclear shadowing effects and to the approach to the black-disc limit of QCD at a semi-hard scale. The cross section of the Xe + Xe → ρ0 + Xe + Xe process, measured at midrapidity through the decay channel ρ0 → π+π−, is found to be dσ/dy = 131.5 ± 5.6(stat.)+17.5 −16.9(syst.) mb. The ratio of the continuum to resonant contributions for the production of pion pairs is also measured. In addition, the fraction of events accompanied by electromagnetic dissociation of either one or both colliding nuclei is reported. The dependence on A of cross section for the coherent ρ0 photoproduction at a centre-of-mass energy per nucleon of the γ A system of Wγ A,n = 65 GeV is found to be consistent with a power-law behaviour σ(γ A → ρ0 A) ∝ Aα with a slope α = 0.96 ± 0.02(syst.). This slope signals important shadowing effects, but it is still far from the behaviour expected in the black-disc limit.
We report on new measurements of Cabibbo-suppressed semileptonic D+s decays using 3.19 fb−1 of e+e− annihilation data sample collected at a center-of-mass energy of 4.178~GeV with the BESIII detector at the BEPCII collider. Our results include branching fractions B(D+s→K0e+νe)=(3.25±0.38(stat.)±0.16(syst.))×10−3 and B(D+s→K∗0e+νe)=(2.37±0.26(stat.)±0.20(syst.))×10−3 which are much improved relative to previous measurements, and the first measurements of the hadronic form-factor parameters for these decays. For D+s→K0e+νe, we obtain f+(0)=0.720±0.084(stat.)±0.013(syst.), and for D+s→K∗0e+νe, we find form-factor ratios rV=V(0)/A1(0)=1.67±0.34(stat.)±0.16(syst.) and r2=A2(0)/A1(0)=0.77±0.28(stat.)±0.07(syst.).
Using a data sample of 448.1×106 𝜓(3686) events collected at √𝑠=3.686 GeV with the BESIII detector at the Beijing Electron-Positron Collider II, we search for the rare decay 𝐽/𝜓→𝜙𝑒+𝑒− via 𝜓(3686)→𝜋+𝜋−𝐽/𝜓. No signal events are observed and the upper limit on the branching fraction is set to be ℬ(𝐽/𝜓→𝜙𝑒+𝑒−)<1.2×10−7 at the 90% confidence level, which is still about one order of magnitude higher than the Standard Model prediction.
Using e+e− collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total integrated luminosity of 300 pb^{-1}, a partial-wave analysis is performed for the process e+e−→K+K−π0π0. The total Born cross sections for the process e+e−→K+K−π0π0, as well as the Born cross sections f or the subprocesses e+e−→ϕπ0π0, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+(892)K∗−(892), are measured versus the center-of-mass energy. The corresponding results for e+e−→K+K−π0π0 and ϕπ0π0 are consistent with those of BaBar and have much improved this http URL analyzing the cross sections for the four subprocesses, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+K∗−, a structure with mass M = (2126.5 ± 16.8 ± 12.4)~MeV/c^{2} and width Γ = (106.9 ± 32.1 ± 28.1)~MeV is observed with an overall statistical significance of 6.3 σ, although with very limited significance in the subprocesses e+e−→K+1(1270)K− and K∗+(892)K∗−(892). The resonant parameters of the observed structure suggest it can be identified with the ϕ(2170), thus the results provide valuable input to the internal nature of the ϕ(2170).
Using e+e− collision data samples with center-of-mass energies ranging from 2.000 to 2.644 GeV, collected by the BESIII detector at the BEPCII collider, and with a total integrated luminosity of 300 pb^{-1}, a partial-wave analysis is performed for the process e+e−→K+K−π0π0. The total Born cross sections for the process e+e−→K+K−π0π0, as well as the Born cross sections f or the subprocesses e+e−→ϕπ0π0, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+(892)K∗−(892), are measured versus the center-of-mass energy. The corresponding results for e+e−→K+K−π0π0 and ϕπ0π0 are consistent with those of BaBar and have much improved this http URL analyzing the cross sections for the four subprocesses, K+(1460)K−, K+1(1400)K−, K+1(1270)K− and K∗+K∗−, a structure with mass M = (2126.5 ± 16.8 ± 12.4)~MeV/c^{2} and width Γ = (106.9 ± 32.1 ± 28.1)~MeV is observed with an overall statistical significance of 6.3 σ, although with very limited significance in the subprocesses e+e−→K+1(1270)K− and K∗+(892)K∗−(892). The resonant parameters of the observed structure suggest it can be identified with the ϕ(2170), thus the results provide valuable input to the internal nature of the ϕ(2170).
Using a data sample of 448.1×106 ψ(3686) events collected at s√= 3.686 GeV with the BESIII detector at the BEPCII, we search for the rare decay J/ψ→ϕe+e− via ψ(3686)→π+π−J/ψ. No signal events are observed and the upper limit on the branching fraction is set to be B(J/ψ→ϕe+e−)<1.2×10−7 at the 90\% confidence level, which is still about one order of magnitude higher than the Standard Model prediction.
The process 𝑒+𝑒−→𝜙𝜂′ has been studied for the first time in detail using data sample collected with the BESIII detector at the BEPCII collider at center of mass energies from 2.05 to 3.08 GeV. A resonance with quantum numbers 𝐽𝑃𝐶=1−− is observed with mass 𝑀=(2177.5±4.8(stat)±19.5(syst))MeV/𝑐2 and width Γ=(149.0±15.6(stat)±8.9(syst)) MeV with a statistical significance larger than 10𝜎, including systematic uncertainties. If the observed structure is identified with the 𝜙(2170), then the ratio of partial width between the 𝜙𝜂′ by BESIII and 𝜙𝜂 by BABAR is (ℬ𝑅𝜙𝜂Γ𝑅𝑒𝑒)/(ℬ𝑅𝜙𝜂′Γ𝑅𝑒𝑒)=0.23±0.10(stat)±0.18(syst), which is smaller than the prediction of the 𝑠¯𝑠𝑔 hybrid models by several orders of magnitude.