530 Physik
Refine
Year of publication
- 2022 (421) (remove)
Document Type
- Preprint (192)
- Article (183)
- Conference Proceeding (26)
- Doctoral Thesis (20)
Language
- English (421) (remove)
Has Fulltext
- yes (421)
Is part of the Bibliography
- no (421)
Keywords
- e +-e − Experiments (7)
- Branching fraction (6)
- Charm Physics (4)
- Experimental nuclear physics (3)
- Experimental particle physics (3)
- Gross-Neveu model (3)
- Heavy Ion Experiments (3)
- Particle and Resonance Production (3)
- Relativistic heavy-ion collisions (3)
- inhomogeneous phases (3)
- mean-field (3)
- BESIII (2)
- CBM (2)
- Charmed mesons (2)
- Chiral Symmetry (2)
- Effective Field Theories of QCD (2)
- Electroweak interaction (2)
- FEBID (2)
- Finite Temperature or Finite Density (2)
- HADES (2)
- Hadron-hadron interactions (2)
- Lepton colliders (2)
- Phase Transitions (2)
- Quarkonium (2)
- STAR (2)
- Space-Time Symmetries (2)
- Thermal & statistical models (2)
- density functional theory (2)
- electronic transport (2)
- moat regime (2)
- neutron stars (2)
- p-n junction (2)
- phase diagram (2)
- scanning tunneling microscopy (2)
- stability analysis (2)
- two-point function (2)
- wave-function renormalization (2)
- α-RuCl3 (2)
- 2 + 1-dimensional field theories (1)
- AGN host galaxies (1)
- Accelerator (1)
- Activation (1)
- Activation experiment (1)
- Alternating Phase Focusing (1)
- Auditory cortex (1)
- B-factor (1)
- BESIII detector (1)
- Beam Energy Scan (1)
- Beam dynamics simulation (1)
- Beta decay (1)
- Binary (1)
- Biological neural networks (1)
- Black hole (1)
- Black holes (1)
- Boundary elements (1)
- CNC manufacturing (1)
- CP violation (1)
- CPS (1)
- CVD (1)
- Calderón operator (1)
- Cell assembly (1)
- Charm physics (1)
- Chiral Lagrangian (1)
- Chiral Magnetic Effect (1)
- Cold nuclear matter effects (1)
- Collision processes (1)
- Continuous wave (1)
- Convolution quadrature (1)
- Cross section (1)
- DFT (1)
- De Donder-Weyl Hamiltonian formulation (1)
- Distance averaging (1)
- Electromagnetic transitions (1)
- Electronic properties and materials (1)
- Elsevier (1)
- Equation of state (1)
- Exotics (1)
- Experimental testing (1)
- FOS: Physical sciences (1)
- Finite element simulations (1)
- Finite elements (1)
- Flavor changing neutral currents (1)
- Flavor symmetries (1)
- Flavour Physics (1)
- Flow (1)
- Fluctuations (1)
- Fourier transform spectroscopy (1)
- Functional Renormalization Group (1)
- Gamma intensity (1)
- Graphene (1)
- Gravitational wave events (1)
- Guided waves (1)
- Hadron-Hadron Scattering (1)
- Hadronic decays (1)
- Heavy Ion experiments (1)
- Heavy Quark Production (1)
- Heavy ion (1)
- Heavy-ion Collisions (1)
- Heavy-ion collisions (1)
- Homeostasis (1)
- Hybrid mesons (1)
- Hydrodynamic models (1)
- Hyperonic stars (1)
- Image processing (1)
- Internal motion (1)
- Interstellar molecules (1)
- Irregular plate with non-uniform thickness (1)
- J/ψ suppression (1)
- Jets (1)
- Josephson junction arrays (1)
- Kalman Filter (1)
- Kitaev model (1)
- LaTeX (1)
- Laser-produced plasmas (1)
- Leapfrog (1)
- Learning (1)
- Lepton-Nucleon Scattering (experiments) (1)
- Leptonic, semileptonic & radiative decays (1)
- Linear accelerator (1)
- Linear response (1)
- Longitudinal and transverse electric fields (1)
- MAPS (1)
- Magnons (1)
- Meson decays (1)
- Minimal length (1)
- Models & methods for nuclear reactions (1)
- Molecular clouds (1)
- Molecule destruction (1)
- Molecule formation (1)
- Mott-type variable-range hopping (1)
- NOE (1)
- NbC (1)
- Network model (1)
- Neural Networks (1)
- Neuronal network models (1)
- Neuroscience, neural computation & artificial intelligence (1)
- Neutrinos (1)
- Neutron physics (1)
- Neutron star (1)
- Noise spectra (1)
- Non-Canonical Amino Acids (1)
- Nonlinear beam dynamics (1)
- Nuclear Astrophysics (1)
- Nuclear Experiment (nucl-ex) (1)
- Nuclear Overhauser effect (1)
- Nuclear pore complex (1)
- Nuclear reactions (1)
- Numerical Relativity (1)
- Nyquist noise (1)
- Optical properties (1)
- Particle & resonance production (1)
- Photon number noise (1)
- Physics (1)
- Physics of Living Systems (1)
- Plasma-based accelerators (1)
- Plasticity (1)
- Population activity (1)
- Protein Dynamics (1)
- Protein Modifications (1)
- Proteins (1)
- QCD (1)
- QED (1)
- Quantum gravity (1)
- Quark Gluon Plasma (1)
- RHIC (1)
- RNA (1)
- RNA sequencing (1)
- Radiation hardness (1)
- Radiative capture (1)
- Radio continuum emission (1)
- Radio jets (1)
- Rapid rotation (1)
- Rare decays (1)
- Representational drift (1)
- Resonance reactions (1)
- Rietveld refinement (1)
- SEM image (1)
- SYK model (1)
- Sensors (1)
- Spectroscopy (1)
- Spinwaves (1)
- Strange particles (1)
- Supermassive black holes (1)
- Template (1)
- Theoretical neuroscience (1)
- Thermal lensing (1)
- Thermal motion (1)
- Thermo optic effects (1)
- Thermoelastic wave equation (1)
- Time Projection Chamber (TPC) (1)
- Time-Resolved Spectroscopy (1)
- Topological insulators (1)
- Translation (1)
- Transparent boundary conditions (1)
- Ultrafast laser spectroscopy (1)
- Very long baseline interferometry (1)
- Vibrational Energy Transfer (1)
- Visible spectroscopy (1)
- Weak Decays (1)
- Y states (1)
- Zr (1)
- ambiguous structures (1)
- charmonium-like states (1)
- chiral imbalance (1)
- compact binary mergers (1)
- cosmological constant (1)
- covariant canonical gauge theory of gravity (1)
- crowd behaviour (1)
- current-voltage (i-v) curves (1)
- deep learning (1)
- direct-write fabrications (1)
- disorder (1)
- electrical transport characteristics (1)
- electron-lattice coupling (1)
- electron-positron collision (1)
- elsarticle.cls (1)
- equation of state (1)
- evacuation (1)
- event pileup (1)
- focused ion beam induced depositions (1)
- graphene (1)
- gravitational waves (1)
- hadron spectroscopy (1)
- heavy-ion (1)
- heavy-ion collisions (1)
- heavy-ion collisions; (1)
- heavy-ion storage rings (1)
- helium-beam radiography (1)
- hypernuclear (1)
- hyperons (1)
- inclusive J/ψ decays (1)
- inertia of space–time (1)
- interactive visualization (1)
- intra-dimer charge and spin degrees of freedom (1)
- inverse kinematics (1)
- ion-beam therapy (1)
- isospin imbalance (1)
- kagome lattices (1)
- kilonovae (1)
- lattice-energy minimization (1)
- magnetic exchange beyond Heisenberg (1)
- magnetic frustration (1)
- manganese (1)
- many-electron correlation (1)
- memristor (1)
- metal carbonyl (1)
- multi-center magnons (1)
- multi-messenger (1)
- multimessenger astrophysics (1)
- nanolithography (1)
- neutron - nuclear reactions (1)
- neutron-induced reactions (1)
- nuclear (1)
- number of J/ψ events (1)
- on imaging (1)
- one-photon double ionization (1)
- organic charge-transfer salts (1)
- pair distribution function refinement (1)
- quadratic-linear gravity (1)
- quinacridone (1)
- r-process (1)
- resistive switching (1)
- solid-state NMR (1)
- space charge distortions (1)
- structure determination from powder data (1)
- superconductor-to-metal transition (1)
- surrogate reactions (1)
- symmetry energy (1)
- temperature dependence measurements (1)
- terahertz magnetometry (1)
- terahertz photons (1)
- tetraquark (1)
- titanium dioxide (1)
- tracking (1)
- two-electron systems (1)
- vanadium (1)
- zero-energy universe (1)
- Υ suppression (1)
Institute
- Physik (372)
- Frankfurt Institute for Advanced Studies (FIAS) (172)
- Informatik (108)
- Informatik und Mathematik (5)
- ELEMENTS (2)
- Biochemie und Chemie (1)
- Biochemie, Chemie und Pharmazie (1)
- Geowissenschaften / Geographie (1)
- MPI für Biophysik (1)
- MPI für Hirnforschung (1)
We investigate the impact of non-Hermiticity on the thermodynamic properties of interacting fermions by examining bilinear extensions to the 3+1 dimensional SU(2)-symmetric Nambu--Jona-Lasinio (NJL) model of quantum chromodynamics at finite temperature and chemical potential. The system is modified through the anti-PT-symmetric pseudoscalar bilinear ψ¯γ5ψ and the PT-symmetric pseudovector bilinear iBνψ¯γ5γνψ, introduced with a coupling g. Beyond the possibility of dynamical fermion mass generation at finite temperature and chemical potential, our findings establish model-dependent changes in the position of the chiral phase transition and the critical end-point. These are tunable with respect to g in the former case, and both g and |B|/B0 in the latter case, for both lightlike and spacelike fields. Moreover, the behavior of the quark number, entropy, pressure and energy densities signal a potential fermion or antifermion excess compared to the standard NJL model, due to the pseudoscalar and pseudovector extension respectively. In both cases regions with negative interaction measure I=ϵ−3p are found. Future indications of such behaviors in strongly interacting fermion systems, for example in the context of neutron star physics, may point toward the presence of non-Hermitian contributions. These trends provide a first indication of curious potential mechanisms for producing non-Hermitian baryon asymmetry. In addition, the formalism described in this study is expected to apply more generally to other Hamiltonians with four-fermion interactions and thus the effects of the non-Hermitian bilinears are likely to be generic.
We investigate the impact of non-Hermiticity on the thermodynamic properties of interacting fermions by examining bilinear extensions to the 3+1 dimensional SU(2)-symmetric Nambu--Jona-Lasinio (NJL) model of quantum chromodynamics at finite temperature and chemical potential. The system is modified through the anti-PT-symmetric pseudoscalar bilinear ψ¯γ5ψ and the PT-symmetric pseudovector bilinear iBνψ¯γ5γνψ, introduced with a coupling g. Beyond the possibility of dynamical fermion mass generation at finite temperature and chemical potential, our findings establish model-dependent changes in the position of the chiral phase transition and the critical end-point. These are tunable with respect to g in the former case, and both g and |B|/B0 in the latter case, for both lightlike and spacelike fields. Moreover, the behavior of the quark number, entropy, pressure, and energy densities signal a potential fermion or antifermion excess compared to the standard NJL model, due to the pseudoscalar and pseudovector extension respectively. In both cases regions with negative interaction measure I=ϵ−3p are found. Future indications of such behaviors in strongly interacting fermion systems, for example in the context of neutron star physics, may point toward the presence of non-Hermitian contributions. These trends provide a first indication of curious potential mechanisms for producing non-Hermitian baryon asymmetry. In addition, the formalism described in this study is expected to apply more generally to other Hamiltonians with four-fermion interactions and thus the effects of the non-Hermitian bilinears are likely to be generic.
Based on electron-positron collision data collected with the BESIII detector operating at the Beijing Electron Positron Collider II storage rings, the value of R≡σ(e+e−→hadrons)/σ(e+e−→μ+μ−) is measured at 14 center-of-mass energies from 2.2324 to 3.6710 GeV. The resulting uncertainties are less than 3.0%, and are dominated by systematic uncertainties.
Based on electron-positron collision data collected with the BESIII detector operating at the Beijing Electron Positron Collider II storage rings, the value of R≡σ(e+e−→hadrons)/σ(e+e−→μ+μ−) is measured at 14 center-of-mass energies from 2.2324 to 3.6710 GeV. The resulting uncertainties are less than 3.0%, and are dominated by systematic uncertainties.
Intermediate Mass Ratio Inspirals (IMRIs) will be observable with space-based gravitational wave detectors such as the Laser Interferometer Space Antenna (LISA). To this end, the environmental effects in such systems have to be modeled and understood. These effects can include (baryonic) accretion disks and dark matter (DM) overdensities, so called spikes. For the first time, we model an IMRI system with both an accretion disk and a DM spike present and compare their effects on the inspiral and the emitted gravitational wave signal. We study the eccentricity evolution, employ the braking index and derive the dephasing index, which turn out to be complementary observational signatures. They allow us to disentangle the accretion disk and DM spike effects in the IMRI system.
Based on (10087±44)×106 J/ψ events collected with the BESIII detector, the process J/ψ→γπ+π−η′ is studied using two dominant decay channels of the η′ meson, η′→γπ+π− and η′→ηπ+π−,η→γγ. The X(2600) is observed with a statistical significance larger than 20σ in the π+π−η′ invariant mass spectrum, and it has a strong correlation to a structure around 1.5 GeV/{\it c}2 in the π+π− invariant mass spectrum. A simultaneous fit on the π+π−η′ and π+π− invariant mass spectra with the two η′ decay modes indicates that the mass and width of the X(2600) state are 2617.8±2.1+18.2−1.9 MeV/{\it c}2 and 200±8+20−17 MeV, respectively. The corresponding branching fractions are measured to be B(J/ψ→γX(2600))⋅B(X(2600)→f0(1500)η′)⋅B(f0(1500)→π+π−) = (3.39±0.18+0.91−0.66)×10−5 and B(J/ψ→γX(2600))⋅B(X(2600)→f′2(1525)η′)⋅B(f′2(1525)→π+π−) = (2.43±0.13+0.31−1.11)×10−5, where the first uncertainties are statistical, and the second systematic.
Based on a sample of (10.09±0.04)×109 J/ψ events collected with the BESIII detector operating at the BEPCII storage ring, a partial wave analysis of the decay J/ψ→γηη′ is performed. An isoscalar state with exotic quantum numbers JPC=1−+, denoted as η1(1855), has been observed for the first time with statistical significance larger than 19σ. Its mass and width are measured to be (1855±9+6−1)~MeV/c2 and (188±18+3−8)~MeV, respectively. The product branching fraction B(J/ψ→γη1(1855)→γηη′) is measured to be (2.70±0.41+0.16−0.35)×10−6. The first uncertainties are statistical and the second are systematic. In addition, an upper limit on the branching ratio B(f0(1710)→ηη′)/B(f0(1710)→ππ) is determined to be 1.61×10−3 at 90\% confidence level, which lends support to the hypothesis that the f0(1710) has a large glueball component.
Study of ψ(3686) → ΛΛ¯ω
(2022)
Based on a data sample of (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector at the BEPCII collider, the branching fraction of ψ(3686)→ΛΛ¯ω is measured to be (3.30±0.34(stat.)±0.29(syst.))×10−5 for the first time. In addition, the Λω (or Λ¯ω) invariant mass spectra is studied and the potential presence of excited Λ states has been investigated.
The study of the Cabibbo-favored semileptonic decay Λ+𝑐→Λ𝑒+𝜈𝑒 is reported using a 4.5 fb−1 data sample of 𝑒+𝑒− annihilations collected at center-of-mass energies ranging from 4.600 GeV to 4.699 GeV with the BESIII detector at the BEPCII collider. The branching fraction of the decay is measured to be ℬ(Λ+𝑐→Λ𝑒+𝜈𝑒)=(3.56±0.11stat±0.07syst)%, which is the most precise measurement to date. Furthermore, we perform an investigation of the internal dynamics in Λ+𝑐→Λ𝑒+𝜈𝑒. We provide the first direct comparisons of the differential decay rate and form factors with those predicted from lattice quantum chromodynamics (LQCD) calculations. Combining the measured branching fraction with a 𝑞2-integrated rate predicted by LQCD, we determine 𝑉𝑐𝑠|=0.936±0.017ℬ±0.024LQCD±0.007𝜏Λ𝑐.
Based on a sample of 4.4 fb−1 of e+e− annihilation data collected in the energy region between 4.6 GeV and 4.7 GeV with the BESIII detector at BEPCII, two singly Cabibbo-suppressed decays Λ+c→Σ0K+ and Λ+c→Σ+K0S are studied. The ratio of the branching fraction B(Λ+c→Σ0K+) relative to B(Λ+c→Σ0π+) is measured to be 0.0361±0.0073(stat.)±0.0005(syst.), and the ratio of B(Λ+c→Σ+K0S) relative to B(Λ+c→Σ+π+π−) is measured to be 0.0106±0.0031(stat.)±0.0004(syst.). After taking the world-average branching fractions of the reference decay channels, the branching fractions B(Λ+c→Σ0K+) and B(Λ+c→Σ+K0S) are determined to be (4.7±0.9(stat.)±0.1(syst.)±0.3(ref.))×10−4 and (4.8±1.4(stat.)±0.2(syst.)±0.3(ref.))×10−4, respectively. The branching fraction of the Λ+c→Σ+K0S decay is measured for the first time.
Using 4.5 fb−1 of e+e− annihilation data samples collected at the center-of-mass energies ranging from 4.600~GeV to 4.699~GeV with the BESIII detector at the BEPCII collider, a first study of the semileptonic decays Λ+c→pK−e+νe, Λ+c→Λ(1520)e+νe and Λ+c→Λ(1405)e+νe is performed. The Λ+c→pK−e+νe decay is observed with a significance of 8.2σ and the branching fraction is measured to be B(Λ+c→pK−e+νe)=(0.88±0.17stat.±0.07syst.)×10−3. We also report evidence of Λ+c→Λ(1520)e+νe and Λ+c→Λ(1405)e+νe with significances of 3.3σ and 3.2σ, respectively, and measure B(Λ+c→Λ(1520)e+νe)=(1.02±0.52stat.±0.11syst.)×10−3 and B(Λ+c→Λ(1405)[→pK−]e+νe)=(0.42±0.19stat.±0.04syst.)×10−3. Combining these with the inclusive semileptonic Λ+c branching fraction measured by BESIII, the relative fraction is determined to be [B(Λ+c→pK−e+νe)/B(Λ+c→Xe+νe)]=(2.1±0.4stat.±0.2syst.)%, which provides a clear confirmation that semileptonic Λ+c decays are not saturated by the Λℓ+νℓ final state.
Using (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector, we perform the first search for the weak baryonic decay ψ(3686)→Λ+cΣ¯−+c.c.. The analysis procedure is optimized using a blinded method. No significant signal is observed, and the upper limit on the branching fraction (B) of ψ(3686)→Λ+cΣ¯−+c.c. is set to be 1.4×10−5 at the 90\% confidence level.
Using (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector, we perform the first search for the weak baryonic decay ψ(3686)→Λ+cΣ¯−+c.c.. The analysis procedure is optimized using a blinded method. No significant signal is observed, and the upper limit on the branching fraction (B) of ψ(3686)→Λ+cΣ¯−+c.c. is set to be 1.4×10−5 at the 90\% confidence level.
Using (448.1±2.9)×106 ψ(3686) events collected with the BESIII detector, we perform the first search for the weak baryonic decay ψ(3686)→Λ+cΣ¯−+c.c.. The analysis procedure is optimized using a blinded method. No significant signal is observed, and the upper limit on the branching fraction (B) of ψ(3686)→Λ+cΣ¯−+c.c. is set to be 1.4×10−5 at the 90\% confidence level.
Based on 7.33 fb−1 of e+e− collision data taken at center-of-mass energies between 4.128 and 4.226 GeV with the BESIII detector, we measure the branching fraction of D∗+s→D+sπ0 relative to that of D∗+s→D+sγ to be (6.16±0.43±0.19)%. The first uncertainty is statistical and the second one is systematic. By using the world average value of the branching fraction of D∗+s→D+se+e−, we determine the branching fractions of D∗+s→D+sγ and D∗+s→D+sπ0 to be (93.57±0.44±0.19)% and (5.76±0.44±0.19)%, respectively.
Based on e+e− collision samples corresponding to an integrated luminosity of 4.4 fb−1 collected with the BESIII detector at center-of-mass energies between 4.6GeV and 4.7GeV, a partial wave analysis of the charmed baryon hadronic decay Λ+c→Λπ+π0 is performed, and the decays Λ+c→Λρ(770)+ and Λ+c→Σ(1385)π are studied for the first time. Making use of the world-average branching fraction B(Λ+c→Λπ+π0), their branching fractions are determined to be B(Λ+c→Λρ(770)+)=B(Λ+c→Σ(1385)+π0)=B(Λ+c→Σ(1385)0π+)=(4.06±0.30±0.35±0.23)×10−2,(5.86±0.49±0.52±0.35)×10−3,(6.47±0.59±0.66±0.38)×10−3, where the first uncertainties are statistical, the second are systematic, and the third are from the uncertainties of the branching fractions B(Λ+c→Λπ+π0) and B(Σ(1385)→Λπ). In addition, %according to amplitudes determined from the partial wave analysis, the decay asymmetry parameters are measured to be αΛρ(770)+=−0.763±0.053±0.039, αΣ(1385)+π0=−0.917±0.069±0.046, and αΣ(1385)0π+=−0.789±0.098±0.056.
Using a data set of electron-positron collisions corresponding to an integrated luminosity of 2.93 fb−1 taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, a search for the baryon (B) and lepton (L) number violating decays D±→n(n¯)e± is performed. No signal is observed and the upper limits on the branching fractions at the 90% confidence level are set to be 1.43×10−5 for the decays D+(−)→n¯(n)e+(−) with Δ|B−L|=0, and 2.91×10−5 for the decays D+(−)→n(n¯)e+(−) with Δ|B−L|=2 , where Δ|B−L| denotes the change in the difference between baryon and lepton numbers.
Using a data set of electron-positron collisions corresponding to an integrated luminosity of 2.93 fb−1 taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, a search for the baryon (B) and lepton (L) number violating decays D±→n(n¯)e± is performed. No signal is observed and the upper limits on the branching fractions at the 90% confidence level are set to be 1.43×10−5 for the decays D+(−)→n¯(n)e+(−) with Δ|B−L|=0, and 2.91×10−5 for the decays D+(−)→n(n¯)e+(−) with Δ|B−L|=2 , where Δ|B−L| denotes the change in the difference between baryon and lepton numbers.
Using a data set of electron-positron collisions corresponding to an integrated luminosity of 2.93 fb−1 taken with the BESIII detector at a center-of-mass energy of 3.773 GeV, a search for the baryon (B) and lepton (L) number violating decays D±→n(n¯)e± is performed. No signal is observed and the upper limits on the branching fractions at the 90% confidence level are set to be 1.43×10−5 for the decays D+(−)→n¯(n)e+(−) with Δ|B−L|=0, and 2.91×10−5 for the decays D+(−)→n(n¯)e+(−) with Δ|B−L|=2 , where Δ|B−L| denotes the change in the difference between baryon and lepton numbers.
Using a sample of 4.3×105 η′→ηπ0π0 events selected from the 10 billion J/ψ event data set collected with the BESIII detector, we study the decay η′→ηπ0π0 within the framework of non-relativistic effective field theory. Evidence for a structure at π+π− mass threshold is observed in the invariant mass spectrum of π0π0 with a statistical significance of around 3.5σ, which is consistent with the cusp effect as predicted by the non-relativistic effective field theory. After introducing the amplitude for describing the cusp effect, the ππ scattering length combination a0−a2 is determined to be 0.226±0.060stat.±0.012syst., which is in good agreement with theoretical calculation of 0.2644±0.0051.