A5062558272- Quantum Chromodynamics and Particle Interactions
- Particle physics theoretical and experimental studies
- High-Energy Particle Collisions Research
- Nuclear physics research studies
- Advanced NMR Techniques and Applications
- Atomic and Molecular Physics
- Advanced Chemical Physics Studies
- Cold Atom Physics and Bose-Einstein Condensates
- Nuclear Physics and Applications
- Quantum, superfluid, helium dynamics
- Physics of Superconductivity and Magnetism
- Inorganic Fluorides and Related Compounds
- Cold Fusion and Nuclear Reactions
- Atomic and Subatomic Physics Research
- Black Holes and Theoretical Physics
- Laser-induced spectroscopy and plasma
- Adversarial Robustness in Machine Learning
- Computational Physics and Python Applications
- Advanced Physical and Chemical Molecular Interactions
- Nuclear Materials and Properties
- High-pressure geophysics and materials
- Superconducting Materials and Applications
- Dark Matter and Cosmic Phenomena
- Nuclear reactor physics and engineering
- Rare-earth and actinide compounds
Ruhr University Bochum
2015-2025
Forschungszentrum Jülich
2001-2024
Institute for Theoretical and Experimental Physics
2014-2024
Kurchatov Institute
2020-2024
P.N. Lebedev Physical Institute of the Russian Academy of Sciences
2018-2024
University of Chinese Academy of Sciences
2024
South China Normal University
2021-2024
Chinese Academy of Sciences
2024
Institute of High Energy Physics
2024
Jagiellonian University
2022
We study the interesting problem of whether it is possible to distinguish composite from elementary particles. In particular we generalize a model-independent approach S. Weinberg case unstable This allows us apply our formalism a0(980) and f0(980) resonances address question these particles are predominantly genuine, confined quark states (of $\bar q q$ or $qq\bar q\bar structure) governed by mesonic components.
A coupled-channel approach is applied to the charged tetraquark state $T_{cc}^+$ recently discovered by LHCb Collaboration. The parameters of interaction are fixed a fit observed line shape in three-body $D^0D^0\pi^+$ channel. Special attention paid dynamics due finite life time $D^*$. An argued be self-consistent only if both manifestations dynamics, pion exchange between $D$ and $D^*$ mesons width, taken into account simultaneously ensure that unitarity preserved. This especially important...
We discuss a novel effective-field-theory-based approach for extracting two-body scattering information from finite volume energies, serving as an alternative to Lüscher’s method. By explicitly incorporating one-pion exchange, we overcome the challenging left-hand cut problem in method and can handle energy levels both below above cut. Applied lattice data <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"...
We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn→dπ(0)π(0) over full energy region ABC effect, a pronounced low-mass enhancement in ππ-invariant mass spectrum. The measurements, which cover also transition to conventional t-channel ΔΔ process, were performed with upgraded WASA detector setup at COSY. data reveal Abashian-Booth-Crowe effect be uniquely correlated Lorentzian dependence integral cross section....
Three hidden-charm pentaquark P_{c} states, P_{c}(4312), P_{c}(4440), and P_{c}(4457) were revealed in the Λ_{b}^{0}→J/ψpK^{-} process measured by LHCb using both run I II data. Their nature is under lively discussion, their quantum numbers have not been determined. We analyze J/ψp invariant mass distributions assumption that crossed-channel effects provide a smooth background. For first time, such an analysis performed employing coupled-channel formalism with scattering potential involving...
We present a calculation of the π−d scattering length with an accuracy few percent using chiral perturbation theory. For first time isospin-violating corrections are included consistently. Using data on pionic deuterium and hydrogen atoms, we extract isoscalar isovector pion–nucleon lengths obtain a+=(7.6±3.1)⋅10−3Mπ−1 a−=(86.1±0.9)⋅10−3Mπ−1. Via Goldberger–Miyazawa–Oehme sum rule, this leads to charged-pion–nucleon coupling constant gc2/4π=13.69±0.20.
Abstract Physical states are characterised uniquely by their pole positions and the corresponding residues. Accordingly, in those parameters also nature of should be encoded. For bound (poles on real s -axis below lowest threshold physical sheet) there is an established criterion formulated originally Weinberg 1960s, which allows one to estimate amount compact molecular components a given state. We demonstrate this paper that can straightforwardly extended shallow virtual unphysical...
Recently, the LHCb Collaboration reported pronounced structures in invariant mass spectrum of $J/\psi$-pairs produced proton-proton collisions at Large Hadron Collider. In this Letter, we argue that data can be very well described within two variants a coupled-channel approach employing $T$-matrices consistent with unitarity: (i) just channels, $J/\psi J/\psi$ and $\psi(2S)J/\psi$, as long energy-dependent interactions these channels are allowed, or (ii) three J/\psi$, $\psi(2S)J/\psi$...
A bstract The nature of the three narrow hidden-charm pentaquark P c states, i.e., (4312), (4440) and (4457), is under intense discussion since their discovery from updated analysis process $$ {\Lambda}_b^0\to J/\psi {pK}^{-} <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>b</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:mi>J</mml:mi> <mml:mo>/</mml:mo> <mml:mi>ψ</mml:mi> <mml:msup> <mml:mi>pK</mml:mi> <mml:mo>−</mml:mo>...
We discuss recent lattice data for the T_{cc}(3875)^{+} state to stress, first time, a potentially strong impact of left-hand cuts from one-pion exchange on pole extraction near-threshold exotic states. In particular, if cut is located close two-particle threshold, which happens naturally in DD^{*} system pion mass exceeding its physical value, effective-range expansion valid only very limited energy range up and as such little use reliably extract poles. Then, an accurate locations requires...
We investigate the role played by three-body $D\bar{D}\pi$ dynamics on near-threshold resonance X(3872) charmonium state, which is assumed to be formed nonperturbative $D\bar D^*$ dynamics. It demonstrated that, as compared naive static-pions approximation, imaginary parts that originate from inclusion of dynamical pions reduce substantially width intermediate state. In particular, for a peaked at 0.5 MeV below $D^0\bar D^{*0}$ threshold, this contribution reduced about factor 2, and effect...
We revisit the consequences of heavy-quark spin symmetry for possible partners X(3872). confirm that, if X(3872) were a ⁎DD¯⁎ molecular state with quantum numbers JPC=1++, then in strict limit there should exist three more hadronic molecules degenerate X(3872), 0++, 1+−, and 2++ line previous results reported literature. demonstrate that this result is robust respect to inclusion one-pion exchange interaction between D mesons. However, true only all relevant partial waves as well particle...
We present a high-accuracy calculation of the deuteron structure radius in chiral effective field theory. Our analysis employs state-of-the-art semilocal two-nucleon potentials and takes into account two-body contributions to charge density operators up fifth order expansion. The strength fifth-order short-range contribution operator is adjusted experimental data on form factor. A detailed error performed by propagating statistical uncertainties low-energy constants entering estimating...
The photoproduction of the $J/\psi$ off proton is believed to deepen our understanding various physics issues. On one hand, it proposed provide access origin mass, based on QCD multipole expansion. other can be employed in a study pentaquark states. process usually assumed proceed through vector-meson dominance, that photon couples which rescatters with give $J/\psi p$ final state. In this Letter, we compelling hint for and propose measurements necessary confirm novel production mechanism...
In 2021, the Belle collaboration reported first observation of a new structure in ψ (2 S ) γ final state produced two-photon fusion process. hadronic molecule picture, this can be associated with shallow isoscalar <?CDATA ${D}^{* }{\overline{D}}^{* }$?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mrow> <mml:msup> <mml:mi>D</mml:mi> <mml:mo>*</mml:mo> </mml:msup> <mml:mover accent="true"> <mml:mo>¯</mml:mo> </mml:mover> </mml:mrow> </mml:math> bound and as...
The most recent experimental data for all measured production and decay channels of the bottomonium-like states $Z_b(10610)$ $Z_b(10650)$ are analysed simultaneously using solutions Lippmann-Schwinger equations which respect constraints from unitarity analyticity. interaction potential in open-bottom $B^{(*)}\bar{B}^{*}+\mbox{c.c.}$ contains short-range interactions as well one-pion exchange. It is found that long-range does not affect line shapes long only $S$ waves considered. Meanwhile,...
We present a comprehensive analysis of the deuteron charge and quadrupole form factors based on latest two-nucleon potentials charge-density operators derived in chiral effective field theory. The single- contributions to density are expressed terms proton neutron factors, for which most up date empirical parametrizations employed. By adjusting fifth-order short-range operator reproduce world data momentum-transfer dependence we predict values structure radius moment deuteron:...
We perform an effective-field-theory-based coupled-channel analysis of the recent BES III data on $e^+e^-$ annihilation into final state $K^+(D_s^-D^{*0}+D_s^{*-}D^0)$ in a wide energy range and extract poles responsible for formation $Z_{cs}(3982)$. identify two scenarios which provide similar description experimental mass distributions but result utterly different predictions spin partners $Z_{cs}(3982)$: although both are consistent with $Z_{cs}$ as $SU(3)$ partner $Z_c(3900)$,...
In recent years many vector charmonium(like) states were reported by different electron-positron collider experiments above 4.2 GeV. However, so far, there not only exists sizable tension in the parameters of those states, but is also no consensus on number this energy range. To some extend, might be caused fact that experimental data typically analyzed single channel analyses employing overlapping Breit-Wigner functions, particular ignoring effect opening thresholds. study, we focus mass...
A brief overview of the properties exotic state $T_{cc}$, as extracted from LHCb data and lattice QCD simulations using chiral effective field theory ($\chi$EFT), is presented. We demonstrate that explicit account for longest-range one-pion exchange interaction, including energy scales associated with three-body left-hand cuts, crucial to maintaining correct analytic structure $ DD^* scattering amplitude near threshold. Using $\chi$EFT up next-to-leading order, we extract low-energy $DD^*$...