Related papers: Wave-like amplification of near-threshold two-particle reactions: from muon-catalyzed fusion to $Λ\barΛ$ production at $e^-e^+$ annihilation

Wave-like amplification of near-threshold two-particle reactions: from muon-catalyzed fusion to $Λ\barΛ$ production at $e^-e^+$ annihilation

URL: http://arxiv.org/abs/2602.00308v1
Date: Fri, 30 Jan 2026 20:59:10 GMT
Title: Wave-like amplification of near-threshold two-particle reactions: from muon-catalyzed fusion to $Λ\barΛ$ production at $e^-e^+$ annihilation
Authors: Vladimir S. Melezhik,
Abstract summary: A simple model is proposed to explain the recently found wave-like enhancement of the $bar$ pair production near the threshold at the $e-e+$ annihilation.<n>In particular, it predicts a single bound state of $bar$ with a binding energy of $varepsilon_bar=(36pm5)$MeV.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: A simple model is proposed to explain the recently found wave-like enhancement of the $Λ\barΛ$ pair production near the threshold at the $e^-e^+$ annihilation, which allows extracting parameters of the $Λ\barΛ$ interaction and the $Λ$-hyperon rms-radius from the oscillatory nature of the measured cross section. In particular, it predicts a single bound state of $Λ\barΛ$ with a binding energy of $\varepsilon_{Λ\barΛ}=(36\pm5)$MeV. The model is a generalization of the formulas obtained in our earlier work [1] to explain the effect of wave-like amplification found in it near the threshold of fusion reactions screened by a muon or electron. The analysis allows us to conclude that the effect of wave-like amplification is an integral feature of any two-particle near-threshold reaction. In this regard, it seems promising to investigate, within the framework of our model, the oscillatory nature of the electromagnetic form factors of hyperons and nucleons extracted in experiments on $e^- e^+$ annihilation. A natural further development of the model could be its generalization to processes of producing various hadron pairs in $e^-e^+$ annihilation.

Related papers

Phase Space Electronic Structure Theory: From Diatomic Lambda-Doubling to Macroscopic Einstein-de Haas [1.1730993190704666]
We show that a phase space theory can capture electronic momentum and model vibrational circular dichroism.<n>By parameterizing the electronic Hamiltonian in terms of both nuclear position and nuclear momentum, a phase space method yields potential energy surfaces.
arXiv Detail & Related papers (2025-12-15T15:46:15Z)
No oscillating subradiant correlations in a strongly driven quantum emitter array [39.146761527401424]
We study time-dependent correlations in a strongly driven array of atoms, coupled to photons in a waveguide.<n>Our main finding is the suppression of subradiant oscillating correlations between atomic states by a strong coherent drive of amplitude.<n>We provide a rigorous proof based on the analytical decomposition of the Liouvillian using spectral theory of simplicial complexes and posets.
arXiv Detail & Related papers (2025-09-12T06:32:36Z)
Phases and propagation of closed p-brane [0.0]
We study phases and propagation of closed $p$-brane within the framework of effective field theory with higher-form global symmetries.<n>We find the (functional) plane-wave solutions for the kinetic terms and derive a path-integral representation of the brane propagator.<n>Although these results are quite intriguing, we also point out that the Born-Oppenheimer approximation is invalid in the point-particle limit.
arXiv Detail & Related papers (2025-03-19T05:04:07Z)
Towards the "puzzle" of Chromium dimer Cr$_2$: predicting the Born-Oppenheimer rovibrational spectrum [44.99833362998488]
This paper calculates the potential energy curve for the state $X1Sigma+$ of the Cr$$$ dimer. It is found for the first time for the whole range of internuclear distances $R$.
arXiv Detail & Related papers (2024-01-06T17:00:12Z)
Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
arXiv Detail & Related papers (2023-05-10T12:59:07Z)
Theory of free fermions under random projective measurements [43.04146484262759]
We develop an analytical approach to the study of one-dimensional free fermions subject to random projective measurements of local site occupation numbers. We derive a non-linear sigma model (NLSM) as an effective field theory of the problem.
arXiv Detail & Related papers (2023-04-06T15:19:33Z)
Engineering infinite-range SU($n$) interactions with spin-orbit-coupled fermions in an optical lattice [0.0]
We study multilevel fermions in an optical lattice described by the Hubbard model with on site SU($n$)-symmetric interactions. Raman pulses that address internal spin states modify the atomic dispersion relation and induce spin-orbit coupling. Our predictions are readily testable in current experiments with ultracold alkaline-earth(-like) atoms.
arXiv Detail & Related papers (2021-09-22T20:13:20Z)
Ultracold spin-balanced fermionic quantum liquids with renormalized $P$-wave interactions [0.0]
We consider a spin-balanced degenerate gas of spin-1/2 fermions governed by low-energy $P$-wave interactions. The energy per particle $barcalE$ in the many-body system is calculated by resumming the ladder diagrams.
arXiv Detail & Related papers (2021-07-16T18:00:01Z)
Dimerization of many-body subradiant states in waveguide quantum electrodynamics [137.6408511310322]
We study theoretically subradiant states in the array of atoms coupled to photons propagating in a one-dimensional waveguide. We introduce a generalized many-body entropy of entanglement based on exact numerical diagonalization. We reveal the breakdown of fermionized subradiant states with increase of $f$ with emergence of short-ranged dimerized antiferromagnetic correlations.
arXiv Detail & Related papers (2021-06-17T12:17:04Z)
$\mathcal{P}$,$\mathcal{T}$-odd effects for RaOH molecule in the excited vibrational state [77.34726150561087]
Triatomic molecule RaOH combines the advantages of laser-coolability and the spectrum with close opposite-parity doublets. We obtain the rovibrational wave functions of RaOH in the ground electronic state and excited vibrational state using the close-coupled equations derived from the adiabatic Hamiltonian.
arXiv Detail & Related papers (2020-12-15T17:08:33Z)
On the four-body problem in the Born-Oppenheimer approximation [0.0]
The model allows exact solvability and a critical analysis of the Born-Oppenheimer approximation. It is shown that the sum of the first two terms of the Puiseux series, in powers of the dimensionless parameter $sigma=fracmM$, coincide exactly with the values obtained in the Born-Oppenheimer approximation.
arXiv Detail & Related papers (2020-07-29T16:43:03Z)
Resonant high-energy bremsstrahlung of ultrarelativistic electrons in the field of a nucleus and a pulsed light wave [68.8204255655161]
Research investigates the resonant high-energy spontaneous bremsstrahlung of ultrarelativistic electrons with considerable energies in the field of a nucleus and a quasimonochromatic laser wave.
arXiv Detail & Related papers (2020-04-05T16:27:11Z)
Generating ${\rm N00N}$-states of surface plasmon-polariton pairs with a nanoparticle [58.720142291102135]
We consider a generation of two-particle quantum states in the process of spontaneous parametric down-conversion of light. We show that for certain excitation geometries, $rm N00N$-states of surface plasmon-polariton pairs could be obtained.
arXiv Detail & Related papers (2020-02-12T22:59:38Z)

This list is automatically generated from the titles and abstracts of the papers in this site.