# Nuclear Physics Seminar

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An effective theory for light lattice nuclei

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Johannes Kirscher (The Hebrew University, Jerusalem, Israel)

**Time:** Thursday, May 28th, 2015, 10:00 am

How sensitive are key features of light nuclear systems to a variation
in the pion mass? As the lightest meson, the impact of the interaction
between a pion and a nucleon is significantly larger relative to other
meson or baryon couplings. It guides the systematic derivation of
nuclear properties from the fundamental theory of quantum chromodynamics
(QCD) via, e.g., chiral perturbation theory. Recently, lattice
techniques were developed to obtain few-nucleon amplitudes directly from
QCD. Even with the unnaturally large quark, and thus pion masses used
to extract these results, the approach promises to be the long-sought
bridge between nuclear and particle physics.
I will present an analysis of lattice QCD data in an
effective-field-theory framework. In particular, the analog of the
effective field theory without pions, which is established for the
description of two and three-nucleon systems and is a promising
candidate for an interaction theory for multi-nucleon systems at
physical pion masses consistent with QCD, is employed.
At leading order in this EFT, the three and four-nucleon system is
investigated. The Phillips and Tjon line constitute peculiar features
tied to the fine-tuned nature of nuclear physics. Whether those
peculiarities result from the physically observed or emerge likewise at
larger values of the pion mass will be the main result of the presented
work.
To exemplify the sensitivity of a few-body observable to the structure
of the interaction at short distances, a discrepancy between two
incarnations of a next-to-leading-order calculation in the charged
3-helium is presented at the physical pion mass.

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