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Papers by A. Faessler

Nuclear Physics A, 1987

The transition potential of pp to the hyperon-antihyperon (fi) system is calculated in the consti... more The transition potential of pp to the hyperon-antihyperon (fi) system is calculated in the constituent quark model with the 'PO model and with the %, model. The 3P0 model allows the tensor coupling between the pp and YY states while the 'S, model restricts that the pp and YP have the same orbital angular momentum.

$Research paper thumbnail of Thermal QCD sum rules in the <math xmlns="http://www.w3.org/1998/Math/MathML"><semantics><mrow><msup><mi>ρ</mi><mn>0</mn></msup></mrow><annotation encoding="application/x-tex">\rho^0</annotation></semantics></math>ρ0 channel revisited$

The European Physical Journal C, 2000

From the hypothesis that at zero temperature the square root of the spectral continuum threshold ... more From the hypothesis that at zero temperature the square root of the spectral continuum threshold s0 is linearly related to the QCD scale Λ we derive in the chiral limit and for temperatures considerably smaller than Λ scaling relations for the vacuum parts of the Gibbs averaged scalar operators contributing to the thermal operator product expansion of the ρ 0 current-current correlator. The scaling with λ ≡ s0(T )/s0(0), s0 being the T -dependent perturbative QCD continuum threshold in the spectral integral, is simple for renormalization group invariant operators, and becomes nontrivial for a set of operators which mix and scale anomalously under a change of the renormalization point. In contrast to previous works on thermal QCD sum rules with this approach the gluon condensate exhibits a sizable T -dependence. The ρ -meson mass is found to rise slowly with temperature which coincides with the result found by means of a PCAC and current algebra analysis of the ρ 0 correlator.

Journal of Physics G: Nuclear Physics, 1981

... We have studied the collective enhancement of the single-particle transitions in MONA nuclei.... more ... We have studied the collective enhancement of the single-particle transitions in MONA nuclei. ... Here IPBCS, B) is the projection of the reference states 11,) (see equations (Al) and (2.3)) and ... Aguer P, Bastin A, Charmant A, El Masri Y, Hubert P, Janssens R, Michel C, Thibaud JP ...

ABSTRACT In a previous article [Phys. Rev. D 79, 053001 (2009)] we estimated the correlated uncer... more ABSTRACT In a previous article [Phys. Rev. D 79, 053001 (2009)] we estimated the correlated uncertainties associated to the nuclear matrix elements (NME) of neutrinoless double beta decay (0 nu beta beta) within the quasiparticle random phase approximation (QRPA). Such estimates encompass recent independent calculations of NMEs, and can thus still provide a fair representation of the nuclear model uncertainties. In this context, we compare the claim of 0 nu beta beta decay in Ge-76 with recent negative results in Xe-136 and in other nuclei, and we infer the lifetime ranges allowed or excluded at 90% C.L. We also highlight some issues that should be addressed in order to properly compare and combine results coming from different 0 nu beta beta decay candidate nuclei.

Arxiv preprint hep-ph/ …, 2001

Abstract: We apply the perturbative chiral quark model to give predictions for the electromagneti... more Abstract: We apply the perturbative chiral quark model to give predictions for the electromagnetic O (p^ 2) low-energy couplings of the ChPT effective Lagrangian that define the electromagnetic mass shifts of nucleons and first-order (e^ 2) radiative corrections to ...

Progress in Particle and Nuclear Physics, 2006

Progress in Particle and Nuclear Physics, 1995

Progress in Particle and Nuclear Physics, 1992