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  1. No Access

    Article

    Study of the Alpha-particle Monopole Transition form Factor

    The \({{}^4\textrm{He}}\) ...

    M. Viviani, A. Kievsky, L. E. Marcucci, L. Girlanda in Few-Body Systems (2024)

  2. Article

    Open Access

    Momentum Dependent Nucleon–Nucleon Contact Interactions and Their Effect on \(p-d\) Scattering Observables

    Starting from a complete set of relativistic nucleon–nucleon contact operators up to order \(O(p^4)\) ...

    E. Filandri, L. Girlanda, A. Kievsky, L. E. Marcucci, M. Viviani in Few-Body Systems (2024)

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  3. No Access

    Chapter and Conference Paper

    Effective Field Theory Descriptions of Few-Nucleon Systems

    The understanding of nuclear systems as composed of interacting nucleons has been considerably sharpened by the effective field theory (EFT) framework. The latter provides a link between the nuclear interactio...

    L. Girlanda, M. Gattobigio, A. Kievsky… in Recent Progress in Few-Body Physics (2020)

  4. No Access

    Article

    Three-nucleon force effects in \(A = 4\) scattering

    We study the effect of the three-nucleon force (3NF) in \(p+{}^3{\mathrm{H}}\) ...

    M. Viviani, L. Girlanda, A. Kievsky, L. E. Marcucci, J. Dohet-Eraly in Few-Body Systems (2018)

  5. No Access

    Article

    Three-Nucleon Force Effects in \({\varvec{p{\text{-}}^3\mathrm{H}}}\) and \({\varvec{n{\text{-}}^3\mathrm{He}}}\) Scattering

    We present a preliminary study of the effect of a three-nucleon force (3NF) in \(p{\text{-}}^3\mathrm{H}\) ...

    M. Viviani, L. Girlanda, A. Kievsky, L. E. Marcucci in Few-Body Systems (2017)

  6. No Access

    Article

    Effect of Three Nucleon Forces in p − 3He Scattering

    The effect of the inclusion of different models of three nucleon (3N) forces in p − 3He elastic scattering at low energies is studied. Two models have been considered: one derived from effective field theory at n...

    M. Viviani, L. Girlanda, A. Kievsky, L. E. Marcucci in Few-Body Systems (2013)

  7. No Access

    Article

    Recent Progress in Ab-initio Four-Body Scattering Calculations

    In the first part of the contribution, we discuss the results of a recent benchmark calculation of n − 3H and p − 3He phase-shifts below the trinucleon disintegration thresholds. Three different methods—Alt, Gras...

    M. Viviani, L. Girlanda, A. Kievsky, L. E. Marcucci in Few-Body Systems (2013)

  8. No Access

    Article

    Relativistic Covariance of the 2-Nucleon Contact Interactions

    Relativistic covariance restricts the number of two-nucleon contact operators. We show that these constraints can be implemented starting from a complete set of relativistically invariant contact operators up ...

    L. Girlanda, M. Viviani in Few-Body Systems (2011)

  9. No Access

    Article

    Neutron–Triton Elastic Scattering

    The Kohn variational principle and the hyperspherical harmonics technique are applied to study the n − 3H elastic scattering at low energies. In this contribution the first results obtained using a non-local real...

    M. Viviani, A. Kievsky, L. Girlanda, L. E. Marcucci, S. Rosati in Few-Body Systems (2009)

  10. No Access

    Article

    Analysis of the Effects of Three-nucleon Forces in A = 3, 4 Systems

    It is not possible to reproduce both the three- and four-nucleon binding energies using the available two-nucleon potentials. This is one manifestation of the need to include a three-nucleon force in the corre...

    A. Kievsky, M. Viviani, L. Girlanda, L. E. Marcucci, S. Rosati in Few-Body Systems (2009)

  11. No Access

    Article

    Structure of A = 3 nuclear systems using realistic Hamiltonians

    The structure of A = 3 low-energy scattering states is described using the hyperspherical harmonics method with realistic Hamiltonian models, consisting of two- and three-nucleon interactions. Both coordinate and...

    L. E. Marcucci, L. Girlanda, A. Kievsky, S. Rosati, M. Viviani in Few-Body Systems (2008)

  12. No Access

    Article

    Variational Calculation on A = 3 and 4 Nuclei with Non-Local Potentials

    The application of the hyperspherical harmonic approach to the case of non-local two-body potentials is described. Given the properties of the hyperspherical harmonic functions, there are no difficulties in co...

    M. Viviani, L. E. Marcucci, S. Rosati, A. Kievsky, L. Girlanda in Few-Body Systems (2006)

  13. No Access

    Article

    Resumming QCD vacuum fluctuations in three-flavor Chiral Perturbation Theory

    Due to its light mass, of order \(\Lambda_{\mathrm {QCD}}\) , the strange quark can play a special role in chiral symmet...

    S. Descotes-Genon, N. H. Fuchs, L. Girlanda… in The European Physical Journal C - Particle… (2004)

  14. No Access

    Article

    Chiral order and fluctuations in multi-flavour QCD

    Multi-flavour \((N_f \ge 3)\) chiral perturbation theory ( \(\chi\) PT) may exhibit instabilities due to vacuum fluctuations of sea ...

    S. Descotes-Genon, L. Girlanda, J. Stern in The European Physical Journal C - Particle… (2003)

  15. No Access

    Article

    Analysis and interpretation of new low-energy \(\pi\pi\) scattering data

    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...

    S. Descotes, N.H. Fuchs, L. Girlanda… in The European Physical Journal C - Particle… (2002)

  16. No Access

    Article

    The anomalous chiral Lagrangian of order \(p^6\)

    We construct the effective chiral Lagrangian for chiral perturbation theory in the mesonic odd-intrinsic-parity sector at order \(p^6\) . The Lagrangian contains 24 in principle ...

    J. Bijnens, L. Girlanda, P. Talavera in The European Physical Journal C - Particle… (2002)