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Gravitational p → ∆+ transition form factors in chiral perturbation theory
The gravitational form factors of the transition from the proton to the ∆ + resonance are calculated to leading one-loop order using a manifestly...
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Low-energy elastic (anti)neutrino–nucleon scattering in covariant baryon chiral perturbation theory
The low-energy antineutrino- and neutrino–nucleon neutral current elastic scattering is studied within the framework of the relativistic SU (2) baryon...
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Analytical evaluation of elastic lepton-proton two-photon exchange in chiral perturbation theory
We present an exact evaluation of the two-photon exchange contribution to the elastic lepton-proton scattering process at low-energies using heavy...
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a → πππ decay at next-to-leading order in chiral perturbation theory
We discuss the construction of the two-flavour axion-pion effective Lagrangian at the next-to-leading order (NLO) in chiral perturbation theory and...
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Amplitude/operator basis in chiral perturbation theory
We establish a systematic construction of the on-shell amplitude/operator basis for Chiral Perturbation Theory (ChPT) in D = 4 spacetime dimensions...
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The Chiral Medium in a Generalized Sigma Model and the Chiral Perturbation Theory
Abstract —The possibility of the formation of a phase with local parity violation(LPV) in a chiral medium in central collisions of heavy ions at high...
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Chiral perturbation theory of the hyperfine splitting in (muonic) hydrogen
The ongoing experimental efforts to measure the hyperfine transition in muonic hydrogen prompt an accurate evaluation of the proton-structure...
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Conformal perturbation theory on K3: the quartic Gepner point
The Gepner model (2) 4 describes the sigma model of the Fermat quartic K3 surface. Moving through the nearby moduli space using conformal perturbation...
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NNLO positivity bounds on chiral perturbation theory for a general number of flavours
We present positivity bounds, derived from the principles of analyticity, unitarity and crossing symmetry, that constrain the low-energy constants of...
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K± → π±a at next-to-leading order in chiral perturbation theory and updated bounds on ALP couplings
The weak decays K ± → π ± a offer a powerful probe of axion-like particles (ALPs). In this work, we provide a comprehensive analysis of these processes...
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The axion-baryon coupling in SU(3) heavy baryon chiral perturbation theory
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...
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Chiral Anomalies and Topology
When a field theory has a symmetry, global or local like in gauge theories, in the tree or classical approximation formal manipulations lead to...
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Two-meson form factors in unitarized chiral perturbation theory
We present a comprehensive analysis of form factors for two light pseudoscalar mesons induced by scalar, vector, and tensor quark operators. The...
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Scalar field, nucleon structure and relativistic chiral theory for nuclear matter
The work that Peter Schuck and I carried out during the nineties in collaboration with the Lyon and Darmstadt theory groups is summarized. I retrace...
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Renormalisation group equations for BRST-restored chiral theory in dimensional renormalisation: application to two-loop chiral-QED
We discuss how renormalisation group equations can be consistently formulated using the algebraic renormalisation framework, in the context of a...
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Phase shifts of the light pseudoscalar meson and heavy meson scattering in heavy meson chiral perturbation theory
We calculate the complete T matrices of the elastic light pseudoscalar meson and heavy meson scattering to the third order in heavy meson chiral...
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Conformal perturbation theory for n-point functions: structure constant deformation
We consider conformal perturbation theory for n -point functions on the sphere in general 2D CFTs to first order in coupling constant. We regulate...
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Chiral Soliton Lattice turns into 3D crystal
Chiral perturbation theory predicts the chiral anomaly to induce a so-called Chiral Soliton Lattice at sufficiently large magnetic fields and baryon...