The two-nucleon 1S0 amplitude zero in chiral effective field theory

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Date/Time:Thursday, 25 Jul 2019 from 4:10 pm to 5:00 pm
Location:A401 Zaffarano Hall
Channel:Nuclear Physics
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Dr. Mario Sanchez Sanchez,CENBG (CNRS/IN2P3 - Universite' de Bordeaux)

The paradigm of effective field theories (EFTs) offers an original and useful perspective in the theoretical comprehension of a number of very diverse physical problems; in particular, the EFT approach appears as particularly powerful in modern nuclear physics. In the momentum regime near the pion mass (approximately 140 MeV) up to the QCD mass scale (around 1 GeV), the approximate chiral symmetry of QCD can be exploited to devise a nuclear EFT, "Chiral EFT", in which only nucleons and pions are treated as propagating degrees of freedom. In this seminar, I will present a new power-counting scheme for the 0-spin, S-wave two-nucleon channel on the basis of the relatively low-lying zero of the 1S0 partial-wave amplitude. I will discuss some implications of such a rearrangement in the description of light nuclei through the ab-initio no-core shell model. Finally, I will summarize my results and mention a few ideas of research projects for the future.