Low-energy scattering and effective interactions of two baryons at 
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 from lattice quantum chromodynamics

Illa, Marc; Beane, Silas R.; Chang, Edmund K. M.; Davoudi, Zohreh; Detmold, Will; Murphy, D.; Orginos, Kostas; Parreño, A.; Savage, Martin J.; Shanahan, Phiala E.; Wagman, Michael L.; Winter, Frank

doi:10.1103/physrevd.103.054508

Cited by 32 publications

(28 citation statements)

References 167 publications

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“…Due to the lack of hyperon scattering data, SU(3) flavor symmetry usually serves as a bridge to relate the YN and YY interactions with strangeness ranging from 0 to −4 in ChEFT and phenomenological models. It has been demonstrated that although the breaking of SU(3) flavor symmetry is non-negligible between different strangeness sectors, it holds approximately in the same strangeness sector [26,88,103]. Therefore, based on SU(3) flavor symmetry, we could determine the ΣΣ (I = 2) 1 S 0 phase shifts from the above-mentioned lattice QCD simulations, as we have done in Sec.…”

Section: Comparison With Experimental Correlation Functionsmentioning

confidence: 98%

“…Meanwhile, with ever-growing computing power and evolving numerical algorithms, it has become possible to derive the YN and YY interactions from first principles lattice QCD simulations [83][84][85][86][87][88]. In the S = −2 sector, the HAL QCD Collaboration has performed lattice QCD simulations for the S-wave ΛΛ and ΞN interactions with an almost physical pion mass (m π = 146 MeV) [87].…”

Section: Introductionmentioning

confidence: 99%

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Strangeness $S = -2$ baryon-baryon interactions and femtoscopic correlation functions in covariant chiral effective field theory

Liu¹,

Li²,

Geng³

2022

Preprint

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We study the baryon-baryon interactions with strangeness S = −2 and corresponding momentum correlation functions in leading order covariant chiral effective field theory. The relevant low energy constants are determined by fitting to the latest HAL QCD simulations, taking into account all the coupled channels. Extrapolating the so-obtained strong interactions to the physical point and considering both quantum statistical effects and the Coulomb interaction, we calculate the ΛΛ and Ξ − p correlation functions with a spherical Gaussian source and compare them with the recent experimental data. We find a remarkable agreement between our predictions and the experimental measurements without introducing any free parameters, which demonstrates the consistency between theory, experiment, and lattice QCD simulations. Finally, we predict the ΣΣ (I = 2) interaction and corresponding momentum correlation function, which rules out the existence of a bound state in this channel. Future experimental measurement of the predicted momentum correlation function will provide a non-trivial test of not only SU(3) flavor symmetry and its breaking but also covariant chiral effective field theory.

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Section: Comparison With Experimental Correlation Functionsmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Strangeness $S = -2$ baryon-baryon interactions and femtoscopic correlation functions in covariant chiral effective field theory

Liu¹,

Li²,

Geng³

2022

Preprint

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“…The strategy of the NPLQCD collaboration is to numerically evaluate path integrals representing Euclidean correlation functions using Monte Carlo sampling methods. In recent work [192], the NPLQCD collaboration performed a study of BB scattering, including baryons of the octect, up to a channel with strangeness S = −4. In Ref.…”

Section: The Ny and Yy Interactionsmentioning

confidence: 99%

“…In Ref. [192], they adopted values of pion and kaon masses of 450 and 596 MeV, respectively. At the unphysical pion mass, the authors found bound BB systems, but in the spin-triplet ΣN and ΞΞ channels.…”

Section: The Ny and Yy Interactionsmentioning

confidence: 99%

Hyperons in Neutron Stars

Logoteta

2021

Universe

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I review the issues related to the appearance of hyperons in neutron star matter, focusing in particular on the problem of the maximum mass supported by hyperonic equations of state. I discuss the general mechanism that leads to the formation of hyperons in the core of neutron stars and I review the main techniques and many-body methods used to construct an appropriate equation of state to describe the strongly interacting system of hadrons hosted in the core of neutron stars. I outline the consequences on the structure and internal composition of neutron stars and also discuss the possible signatures of the presence of hyperons in astrophysical dynamical systems like supernova explosions and binary neutron star mergers. Finally, I briefly report about the possible important role played by hyperons in the transport properties of neutron star matter and on the consequences of neutron star cooling and gravitational wave instabilities induced by the presence of hyperons.

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“…An area where lattice QCD can have a particularly big impact is the determination of LECs that are difficult to obtain from experiment because data is scarce or non-existent. This applies, for example, to the strangeness sector and hypernuclei [43]. If the NN force could be calculated, this would help to understand what happens in neutron stars at higher densities.…”

Section: Progress and Prioritiesmentioning

confidence: 99%