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Investigations of the Few-Nucleon Systems within the LENPIC Project

by Jacek Golak,Evgeny Epelbaum,Alessandro Grassi,Hiroyuki Kamada,Hermann Krebs,Patrick Reinert,Roman Skibi\'nski,Volodymyr Soloviov,Kacper Topolnicki,Vitalii Urbanevych,Yuriy Volkotrub,Henryk Wita{\l}a

This is not the current version.

Submission summary

As Contributors: Jacek Golak
Preprint link: scipost_201910_00002v1
Date submitted: 2019-10-07
Submitted by: Golak, Jacek
Submitted to: SciPost Physics Proceedings
Proceedings issue: 24th European Few Body Conference (University of Surrey, U.K.)
Discipline: Physics
Subject area: Nuclear Physics - Theory
Approach: Theoretical

Abstract

Results presented in this contribution are obtained within the Low Energy Nuclear Physics International Collaboration (LENPIC). LENPIC aims to develop chiral nucleon-nucleon and many-nucleon interactions complete through at least the fourth order in the chiral expansion. These interactions will be used together with consistently derived current operators to solve the structure and reactions of light and medium-mass nuclei including electroweak processes. In this contribution the current status of the chiral nuclear forces and current operators will be briefly discussed. A special role played by the calculations of nucleon-deuteron scattering will be explained.

Current status:
Has been resubmitted



Reports on this Submission

Anonymous Report 1 on 2019-11-12 Invited Report

Strengths

Clear and comprehensive review of the status of the LENPIC collaboration.

Weaknesses

Misses a global view of how this work is embedded with the rest of the field.

Report

The author gives a comprehensive review of the work carried out by the LENPIC collaboration, with emphasis on the development of nuclear forces and currents
and focussing on their performance for few-body observables. This summary will
certainly be a helpful short-reference for the community, however, it does lack
information about how these results compare to other effort in the field.

To improve the utility for non specialised users in the filed, I strongly suggest
adding further comments to the manuscript as follows:

- Sec. 3 discusses the introduction of new N4LO interactions with local (and
semi-local) regularization, as well as the issues in combining them with
matching 3NFs. How does these new forces compare to data? What are the
implications for, e.g., the Ay puzzle? Fig. 1, does not show any comparison
with the experiment...

- Other authors (e.g., Entem, Machleidt and Nosyk) have developed nuclear forces
up to N4/N5LO. Likewise there are saturating interactions such as NNLOsat that
are successfully used in applications: The manuscript should mention these
efforts (at least for correctness). Also, it would be very valuable if the authors
could comment on how LENPIC interactions perform compared to these other efforts.

- In the discussion of currents, Sec. 4, it is never rally mentioned what are
the limits of application, especially in relation to the applied cutoffs. This
information on the state-of-the-art is quite relevant given that a large portion
of experiments with electron and weak probes that implies very large transferred
momenta.

Requested changes

See report above

  • validity: high
  • significance: high
  • originality: high
  • clarity: high
  • formatting: excellent
  • grammar: excellent

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