Hypertriton lifetime

Abstract

Over the last decade, conflicting values of the hypertriton ${}_{\Lambda }^3\mathrm{H}$ lifetime $\tau ({}_{\Lambda }^3\mathrm{H})$ were extracted from relativistic heavy-ion (RHI) collision experiments, ranging from values compatible with the free-$\Lambda$ lifetime ${\tau }_{\Lambda }$-as expected naively for a very weakly bound $\Lambda$ in ${}_{\Lambda }^3\mathrm{H}$-to lifetimes as short as $\tau ({}_{\Lambda }^3\mathrm{H})\approx (0.4-0.7){\tau }_{\Lambda }$. In a recent work [Phys. Lett. B 811, 135916 (2020)] we studied this ${}_{\Lambda }^3\mathrm{H}$ lifetime puzzle theoretically using realistic three-body ${}_{\Lambda }^3\mathrm{H}$ and ${}^3\mathrm{He}$ wave functions computed within the ab initio no-core shell model approach with interactions derived from chiral effective field theory. In particular, $\tau ({}_{\Lambda }^3\mathrm{H})$ was found to be strongly correlated with the $\Lambda$ separation energy $B_{\Lambda }$ in ${}_{\Lambda }^3\mathrm{H}$, the value of which is rather poorly known experimentally and, in addition, is known to suffer from sizable theoretical uncertainties inherent in the employed nuclear and hypernuclear interaction models. In the present work we find that these uncertainties propagate into $\tau ({}_{\Lambda }^3\mathrm{H})$, and thus limit considerably the theoretical precision of its computed value. Although none of the conflicting RHI measured $\tau ({}_{\Lambda }^3\mathrm{H})$ values can be excluded, but rather can be attributed to a poor knowledge of $B_{\Lambda }$, we note the good agreement between the lifetime value $\tau ({}_{\Lambda }^3\mathrm{H})=238(27)$ ps computed at the lowest value $B_{\Lambda }=66$ keV reached by us and the very recent ALICE measured lifetime value ${\tau }^{\mathrm{ALICE}}({}_{\Lambda }^3\mathrm{H})=253(11)(6)$ ps associated with the ALICE measured $B_{\Lambda }$ value $B_{\Lambda }^{\mathrm{ALICE}}=102(63)(67)$ keV [Phys. Rev. Lett. 131, 102302 (2023)].

arXiv comment15 pages, 6 figures, 3 tables; minor changes, matches published version

References in corpus (33)

• Strangeness in nuclear physics
• Extended Partial-Wave Analysis of piN Scattering Data
• In-medium nuclear interactions of low-energy hadrons
• Hyperon-nucleon interactions - a chiral effective field theory approach
• Few-nucleon systems in translationally invariant harmonic oscillator basis
• Polarization and Entanglement in Baryon-Antibaryon Pair Production in Electron-Positron Annihilation
• ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\bar{\Lambda }}^3\overline{\mathrm{H}}$ production in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• The Hypernuclei ${}_{\Lambda }^4$He and ${}_{\Lambda }^4$H: Challenges for Modern Hyperon-Nucleon Forces
• Uncertainty analysis and order-by-order optimization of chiral nuclear interactions
• Measurement of the mass difference and the binding energy of the hypertriton and antihypertriton
• Hypernuclear spectroscopy of products from 6Li projectiles on a carbon target at 2 AGeV
• Hyperon-nucleon three-body forces and strangeness in neutron stars
• Pi-mesonic decay of the hypertriton
• Infrared length scale and extrapolations for the no-core shell model
• Impact of chiral hyperonic three-body forces on neutron stars
• Measurement of hyper triton lifetime in Au + Au collisions at the Relativistic Heavy-Ion Collider
• Measurements of ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\Lambda }^4\mathrm{H}$ Lifetimes and Yields in Au+Au Collisions in the High Baryon Density Region
• ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\bar{\Lambda }}^3\bar{\mathrm{H}}$ lifetime measurement in Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV via two-body decay
• Large-scale exact diagonalizations reveal low-momentum scales of nuclei
• Ultraviolet extrapolations in finite oscillator bases
• The pion-nucleon $\sigma$ term from pionic atoms
• Measurement of the lifetime and $\Lambda$ separation energy of ${}_{\Lambda }^3\mathrm{H}$
• The in-medium isovector pi N amplitude from low energy pion scattering
• Hypernuclear No-Core Shell Model
• Towards resolving the ${}_{\Lambda }^3$H lifetime puzzle
• Elastic scattering of low energy pions by nuclei and the in-medium isovector pi N amplitude
• The nonmesonic weak decay of the hypertriton
• Revisiting the hypertriton lifetime puzzle
• Constraints from $\Lambda$ hypernuclei on the $\Lambda NN$ content of the $\Lambda$-nucleus potential
• $\Lambda$ hypernuclear potentials beyond linear density dependence
• Nuclear physics uncertainties in light hypernuclei
• Testing in-medium $\pi N$ dynamics on pionic atoms
• Systematic Nuclear Uncertainties in the Hypertriton System

Cited by in corpus (2)

• On a possible ${}_{\varphi }^3$H hypernucleus with HAL QCD interaction
• Binding energy of ${}_{\Lambda }^3\mathrm{H}$ and ${}_{\Lambda }^4\mathrm{H}$ via image analyses of nuclear emulsions using deep-learning