Zobrazeno 1 - 10
of 1 048
pro vyhledávání: '"Epelbaum, E"'
We work out the spatial density distributions corresponding to the axial-vector charge density operator for spin-1/2 systems using states described by sharply localized wave packets in arbitrary Lorentz-frames. The static approximation, leading to th
Externí odkaz:
http://arxiv.org/abs/2412.05050
The gravitational form factors of the deuteron are calculated in the framework of non-relativistic chiral effective field theory. Non-relativistic reduction of the matrix element of the energy-momentum tensor operator for spin-one systems is worked o
Externí odkaz:
http://arxiv.org/abs/2411.19909
A consistency condition of general relativity as an effective field theory in Minkowskian background uniquely fixes the value of the cosmological constant. In two-loop calculations, including the interaction of gravitons with matter fields, it has be
Externí odkaz:
http://arxiv.org/abs/2405.09301
The gravitational form factors of the transition from the proton to the $\Delta^+$ resonance are calculated to leading one-loop order using a manifestly Lorentz-invariant formulation of chiral perturbation theory. We take into account the leading ele
Externí odkaz:
http://arxiv.org/abs/2312.05193
The matrix elements of the electromagnetic current and the energy-momentum tensor for sharply localized states of spin-1 systems are considered. Their interpretation as local spatial densities of various characteristics of the considered system is di
Externí odkaz:
http://arxiv.org/abs/2305.01491
Publikováno v:
Phys.Rev.C 108 (2023) 3, 034002
We investigate the pairing properties of state-of-the-art semilocal coordinate-space and semilocal momentum-space regularized chiral interactions. Specifically, we calculate the pairing gaps in $^3SD_1$ channel of symmetric nuclear matter and in $^1S
Externí odkaz:
http://arxiv.org/abs/2302.12463
Autor:
Gasparyan, A. M., Epelbaum, E.
We extend the renormalizability study of the formulation of chiral effective field theory with a finite cutoff, applied to nucleon-nucleon scattering, by taking into account non-perturbative effects. We consider the nucleon-nucleon interaction up to
Externí odkaz:
http://arxiv.org/abs/2301.13032
Publikováno v:
JHEP02(2023)163
The definition of local spatial densities by using sharply localized one-particle states is applied to spin-3/2 systems. Matrix elements of the electromagnetic current and the energy-momentum tensor are considered and integral expressions of associat
Externí odkaz:
http://arxiv.org/abs/2212.11505
Publikováno v:
Eur.Phys.J.C 83 (2023) 7, 617
We work out details of defining the spatial densities corresponding to the gravitational form factors of spin-0 and spin-1/2 systems using spherically symmetric sharply localized wave packets. The expressions for the spatial densities are provided in
Externí odkaz:
http://arxiv.org/abs/2211.09596
Publikováno v:
Phys.Rev.D 107 (2023) 1, 014027
Heavy-quark spin symmetry (HQSS) implies that in the direct decay of a heavy quarkonium with spin $S$, only lower lying heavy quarkonia with the same spin $S$ can be produced. However, this selection rule, expected to work very well in the $b$-quark
Externí odkaz:
http://arxiv.org/abs/2211.08038