☆ 4.8 Article

Mass of the H Dibaryon

PHYSICAL REVIEW LETTERS (2011)

Journal

PHYSICAL REVIEW LETTERS

Volume 107, Issue 9, Pages -

Publisher

AMER PHYSICAL SOC

DOI: 10.1103/PhysRevLett.107.092004

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Categories

Physics, Multidisciplinary

Funding

University of Adelaide
Australian Research Council [FL0992247, DP110101265]

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Abstract

Recent lattice QCD calculations have reported evidence for the existence of a bound state with strangeness -2 and baryon number 2 at quark masses somewhat higher than the physical values. By developing a description of the dependence of this binding energy on the up, down and strange quark masses that allows a controlled chiral extrapolation, we explore the hypothesis that this state is to be identified with the H dibaryon. Taking as input the recent results of the HAL and NPLQCD Collaborations, we show that the H dibaryon is likely to be unbound by 13 +/- 14 MeV at the physical point.

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Helicity-dependent distribution of strange quarks in the proton from nonlocal chiral effective theory

Fangcheng He, Chueng-Ryong Ji, W. Melnitchouk, Y. Salamu, A. W. Thomas, P. Wang, X. G. Wang

Summary: The helicity-dependent strange quark distribution in the proton, As, is calculated in a nonlocal chiral SU(3) effective field theory. The polarized strange quark distribution is found to be quite small.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Finite-volume pionless effective field theory for few-nucleon systems with differentiable programming

Xiangkai Sun, William Detmold, Di Luo, Phiala E. Shanahan

Summary: Finite-volume pionless effective field theory provides an efficient framework for extrapolating nuclear spectra and matrix elements from finite volume to infinite volume, as well as for extending calculations to larger atomic systems. In this work, the authors demonstrate the implementation of this framework using optimized correlated Gaussian wave functions and solving a generalized eigenvalue problem, which is shown to be significantly more efficient compared to previous stochastic methods.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Gluon gravitational structure of hadrons of different spin

Dimitra A. Pefkou, Daniel C. Hackett, Phiala E. Shanahan

Summary: The lattice QCD study investigates the gluon gravitational form factors of hadrons, revealing their contributions to various mechanical properties and estimating corresponding mechanical and mass radii. The results provide insights into the internal structure of hadrons and the role of gluons.

PHYSICAL REVIEW D (2022)

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Article Astronomy & Astrophysics

Constraints on the dark photon from deep inelastic scattering

A. W. Thomas, X. G. Wang, A. G. Williams

Summary: We investigate constraints on the dark photon arising from deep inelastic scattering data. By extracting parton distribution functions and considering the variations of the dark photon mixing parameter and mass, as well as the effects of vector-meson dominance, exclusion limits on the kinetic mixing parameter of the dark photon are inferred.

PHYSICAL REVIEW D (2022)

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