254 citations · 3k across the 66 of their papers we have counts for
13 papers · 1 filter
Chiral Perturbation Theory in a Nuclear Background
L. Girlanda, A. Rusetsky, W. Weise
We propose a novel way to formulate Chiral Perturbation Theory in a nuclear background, characterized by a static, non-uniform distribution of the baryon number that describes the…
Resumming QCD vacuum fluctuations in three-flavour Chiral Perturbation Theory
S. Descotes-Genon, N. H. Fuchs, L. Girlanda +1
Due to its light mass of order Lambda_QCD, the strange quark can play a special role in Chiral Symmetry Breaking (ChSB): differences in the pattern of ChSB in the limits N_f=2 (m_u…
Chiral order and fluctuations in multi-flavour QCD
S. Descotes-Genon, L. Girlanda, J. Stern
Multi-flavour (N_f>=3) Chiral Perturbation Theory (ChPT) may exhibit instabilities due to vacuum fluctuations of sea q-bar q pairs. Keeping the fluctuations small would require a v…
Analysis and interpretation of new low-energy Pi-Pi scattering data
S. Descotes, N. H. Fuchs, L. Girlanda +1
The recently published E865 data on charged K_e4 decays and Pi-Pi phases are reanalyzed to extract values of the two S-wave scattering lengths, of the subthreshold parameters alpha…
The anomalous chiral Lagrangian of order
J. Bijnens, L. Girlanda, P. Talavera
We construct the effective chiral Lagrangian for chiral perturbation theory in the mesonic odd-intrinsic-parity sector at order . The Lagrangian contains 24 in principle measu…
Double chiral logarithms of Generalized Chiral Perturbation Theory for low-energy pi-pi scattering
L. Girlanda
We express the two-massless-flavor Gell-Mann--Oakes--Renner ratio in terms of low-energy pi-pi observables, including the O(p^6) double chiral logarithms of generalized chiral pert…
Eta' Mass and Chiral Symmetry Breaking at Large Nc and Nf
L. Girlanda, J. Stern, P. Talavera
We propose a method for implementing the large-Nc, large-Nf limit of QCD at the effective Lagrangian level. Depending on the value of the ratio Nf/Nc, different patterns of chiral…
Relationship between the quark condensate and low-energy Pi-Pi observables beyond O(p^4)
Luca Girlanda
The two-flavor Gell-Mann-Oakes-Renner ratio is expressed in terms of low-energy pi-pi observables including the O(p^6) double chiral logarithms, computed in Generalized Chiral Pert…
Measuring the quark condensate from the decays tau -> 3 pi + nu(tau)
Luca Girlanda
The possibility of detecting the S-wave of the decays tau -> 3 pi + nu(tau) in the threshold region is explored, with emphasis on the sensitivity to the size of the quark antiquark…
Paramagnetic effect of light quark loops on Chiral Symmetry Breaking
Sebastien Descotes, Luca Girlanda, Jan Stern
We argue that light quark loops produce a paramagnetic suppression of infrared-sensitive order parameters such as <qq>, as the number N_f of light fermions increases. The possibly…
The decay tau -> 3 pi + nu(tau) as a probe of the mechanism of dynamical chiral symmetry breaking
Luca Girlanda, Jan Stern
The decays tau -> 3 pi + nu(tau) are analyzed at one loop order in the framework of Generalized Chiral Perturbation Theory, in order to test the sensitivity to the size of spontane…
Finite Energy Chiral Sum Rules and Tau Spectral Functions
M. Davier, L. Girlanda, A. Hoecker +1
A combination of finite energy sum rule techniques and Chiral Perturbation Theory (ChPT) is used in order to exploit recent ALEPH data on the non-strange tau vector (V) and axial-v…
Comment on the Prediction of Two-loop Standard Chiral Perturbation Theory for Low-Energy ππScattering
L. Girlanda, M. Knecht, B. Moussallam +1
Four of the six parameters defining the two-loop ππscattering amplitude have been determined using Roy dispersion relations. Combining this information with the Standard χPT expres…