Density effects in precision laser spectroscopy of exotic helium atoms

• URL: http://arxiv.org/abs/2607.07125v1
• Date: Wed, 08 Jul 2026 08:13:36 GMT
• Title: Density effects in precision laser spectroscopy of exotic helium atoms
• Abstract summary: We present a theoretical evaluation of the collisional and density effects governing pionic and kaonic helium systems.<n>Results establish an essential benchmark for future experiments, paving the way for refined determinations of the pion and kaon masses.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: Exotic helium atoms act as unique atomic traps for heavy, negatively charged particles, protecting them from nuclear annihilation and nuclear capture on timescales long enough to enable high-precision laser spectroscopy. Such measurements serve as stringent tests of three-body quantum electrodynamics and offer a direct route to determining fundamental particle masses. Motivated by upcoming spectroscopic efforts targeting pionic ($π^{-\,4}\mathrm{He}^+$) and kaonic ($K^{-\,4}\mathrm{He}^+$) helium, we present a rigorous theoretical evaluation of the collisional and density effects governing these systems. Using an ab initio potential energy surface and coupled-channel quantum scattering calculations, we study the collisional stability of the candidate metastable states against inelastic quenching in a cryogenic helium buffer gas. Furthermore, we provide theoretical reference values for the pressure broadening and pressure shift coefficients of the targeted transitions. These results establish an essential benchmark for future experiments, paving the way for refined determinations of the pion and kaon masses.

Related papers

• Effective Faraday interaction between light and Helium-3 nuclear spins in a multi-pass cell [4.385628263972571]
  Helium-3 nuclear spins form an exceptionally stable quantum system with extremely long coherence time.<n>A central challenge for all these applications is the realization of a controllable light-nuclear spin interface.<n>We experimentally demonstrate such an interface by exploiting metastability-exchange collisions in a low-pressure helium-3 gas cell at room temperature.
  arXiv  Detail & Related papers  (2026-06-18T15:04:28Z)
• Quantum optomechanics of lossy bodies: general approach and structured squeezed vacuum effects [51.56484100374058]
  We investigate the overall optomechanical force experienced by a macroscopic lossy object in free space under external quantum illumination.<n>By driving the scattering field with an anisotropic, multimode squeezed vacuum state, the spatial profile of the electromagnetic quantum fluctuations can be engineered to exhibit broken rotational symmetry.<n>We establish a general formalism for macroscopic quantum optomechanics that operates beyond the constraints of thermal equilibrium.
  arXiv  Detail & Related papers  (2026-04-07T13:25:43Z)
• Quantum calculation of the collision-induced line-shape effects in antiprotonic helium and the new accurate ab initio $\ar{p}$He$^{+}$-He potential energy surface [0.0]
  We present the first fully ab initio calculations of collision-induced broadening and shift of spectral lines in antiprotonic helium.<n>This dataset provides the first rigorous benchmark for earlier semiclassical calculations.<n>It establishes a robust theoretical reference for high-precision spectroscopy of antiprotonic helium.
  arXiv  Detail & Related papers  (2025-09-28T12:45:36Z)
• Determining Absolute Neutrino Mass using Quantum Technologies [0.0]
  The project represents the core activity of the Quantum Technologies for Neutrino Mass project.<n>Its goal is to develop a new experimental apparatus that can enable a determination of the absolute neutrino mass with a sensitivity on the order of 10meV/$c2$.
  arXiv  Detail & Related papers  (2024-12-09T09:41:30Z)
• Threshold studies for a hot beam superradiant laser including an atomic guiding potential [0.0]
  Recent theoretical predictions hint at an implementation of a superradiant laser based on narrow optical clock transitions. We show that the temperature threshold can be significantly increased by using more atoms. Interestingly we see that higher order atom-field and direct atom-atom quantum correlations play only a minor role in the laser dynamics.
  arXiv  Detail & Related papers  (2023-08-10T14:05:09Z)
• Precision Spectroscopy of Fast, Hot Exotic Isotopes Using Machine Learning Assisted Event-by-Event Doppler Correction [0.6999740786886537]
  We propose an experimental scheme for performing sensitive, high-precision laser spectroscopy studies on fast exotic isotopes. The ability to perform in-flight spectroscopy, directly on highly energetic beams, offers unique opportunities to study short-lived isotopes with lifetimes in the millisecond range.
  arXiv  Detail & Related papers  (2023-04-25T19:53:59Z)
• The maximum refractive index of an atomic crystal $\unicode{x2013}$ from quantum optics to quantum chemistry [52.77024349608834]
  We investigate the index of an ordered arrangement of atoms, as a function of atomic density. In quantum optics, we show that ideal light-matter interactions can have a single-mode nature. At the onset of quantum chemistry, we show how two physical mechanisms can open up inelastic or spatial multi-mode light scattering processes.
  arXiv  Detail & Related papers  (2023-03-20T10:29:12Z)
• Quantum density matrix theory for a laser without adiabatic elimination of the population inversion: transition to lasing in the class-B limit [62.997667081978825]
  No class-B quantum density-matrix model is available to date, capable of accurately describing coherence and photon correlations within a unified theory. Here we carry out a density-matrix theoretical approach for generic class-B lasers, and provide closed equations for the photonic and atomic reduced density matrix in the Fock basis of photons. This model enables the study of few-photon bifurcations and non-classical photon correlations in class-B laser devices, also leveraging quantum descriptions of coherently coupled nanolaser arrays.
  arXiv  Detail & Related papers  (2022-05-26T16:33:51Z)
• A multiconfigurational study of the negatively charged nitrogen-vacancy center in diamond [55.58269472099399]
  Deep defects in wide band gap semiconductors have emerged as leading qubit candidates for realizing quantum sensing and information applications. Here we show that unlike single-particle treatments, the multiconfigurational quantum chemistry methods, traditionally reserved for atoms/molecules, accurately describe the many-body characteristics of the electronic states of these defect centers.
  arXiv  Detail & Related papers  (2020-08-24T01:49:54Z)
• Maximum refractive index of an atomic medium [58.720142291102135]
  All optical materials with a positive refractive index have a value of index that is of order unity. Despite the giant response of an isolated atom, we find that the maximum index does not indefinitely grow with increasing density. We propose an explanation based upon strong-disorder renormalization group theory.
  arXiv  Detail & Related papers  (2020-06-02T14:57:36Z)
• Nitrogen-vacancy defect emission spectra in the vicinity of an adjustable silver mirror [62.997667081978825]
  Optical emitters of quantum radiation in the solid state are important building blocks for emerging technologies. We experimentally study the emission spectrum of an ensemble of nitrogen-vacancy defects implanted around 8nm below the planar diamond surface.
  arXiv  Detail & Related papers  (2020-03-31T10:43:26Z)

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

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.