Zobrazeno 1 - 10
of 38
pro vyhledávání: '"Vonk, Thomas"'
Autor:
Vonk, Thomas, Meißner, Ulf-G.
We analyze the large-$N_c$ structure of the baryon-baryon potential derived in the framework of SU(3) chiral perturbation theory up to next-to-leading order including contact interactions as well as one-meson and two-meson exchange diagrams. Moreover
Externí odkaz:
http://arxiv.org/abs/2412.13677
Publikováno v:
Phys. Rev. D 105 (2022) 054029
The process of pion axioproduction, $aN\to\pi N$, with an intermediate $\Delta$ resonance is analyzed using baryon chiral parturbation theory. The $\Delta$ resonance is included in two ways: First, deriving the $a\Delta N$-vertices, the axion is brou
Externí odkaz:
http://arxiv.org/abs/2202.00268
Autor:
Vonk, Thomas
Publikováno v:
PoS Regio2021 (2022) 019
I give an overview of recent developments in the study of the coupling of the QCD axion to nucleons and other octet baryons. I demonstrate how axions can be included into heavy baryon chiral perturbation theory, and present recent numerical results f
Externí odkaz:
http://arxiv.org/abs/2201.08132
Publikováno v:
JHEP 02 (2022) 001
We investigate the phase shifts of low-energy alpha-alpha scattering under variations of the fundamental parameters of the Standard Model, namely the light quark mass, the electromagnetic fine-structure constant as well as the QCD theta-angle. As a f
Externí odkaz:
http://arxiv.org/abs/2112.09409
Publikováno v:
JHEP 08 (2021) 024
In the past, the axion-nucleon coupling has been calculated in the framework of SU(2) heavy baryon chiral perturbation theory up to third order in the chiral power counting. Here, we extend these earlier studies to the case of heavy baryon chiral per
Externí odkaz:
http://arxiv.org/abs/2104.10413
Publikováno v:
Phys. Rev. Research 2, 033392 (2020)
We investigate the impact of the QCD vacuum at nonzero $\theta$ on the properties of light nuclei, Big Bang nucleosynthesis, and stellar nucleosynthesis. Our analysis starts with a calculation of the $\theta$-dependence of the neutron-proton mass dif
Externí odkaz:
http://arxiv.org/abs/2006.12321
Publikováno v:
JHEP, 2020, 05: 001
At low energies, the strong interaction is governed by the Goldstone bosons associated with the spontaneous chiral symmetry breaking, which can be systematically described by chiral perturbation theory. In this paper, we apply this theory to study th
Externí odkaz:
http://arxiv.org/abs/2003.01625
Publikováno v:
JHEP 03 (2020) 138
We derive the axion-nucleon interaction Lagrangian in heavy baryon chiral perturbation theory up to next-to-next-to-leading order. The effective axion-nucleon coupling is calculated to a few percent accuracy.
Comment: 20 pages
Comment: 20 pages
Externí odkaz:
http://arxiv.org/abs/2001.05327
Publikováno v:
JHEP 1906 (2019) 106, Addendum: JHEP 10 (2019) 028 (DOI: 10.1007/JHEP10(2019)028)
This paper addresses two aspects concerning the $\theta$-vacuum of Quantum Chromodynamics. First, large-$N_c$ chiral perturbation theory is used to calculate the first two non-trivial cumulants of the distribution of the winding number, i.\,e. the to
Externí odkaz:
http://arxiv.org/abs/1905.06141
Autor:
Vonk, Thomas
Publikováno v:
Mexicon, 2019 Apr 01. 41(2), 49-55.
Externí odkaz:
https://www.jstor.org/stable/45386014
