Journal
CHINESE PHYSICS C
Volume 42, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1674-1137/42/1/014105
Keywords
hyperon-nucleon interactions; covariant chiral effective field theory; hypernuclear physics
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Funding
- National Natural Science Foundation of China [11375024, 11522539, 11375120]
- China Postdoctoral Science Foundation [2016M600845, 2017T100008]
- Fundamental Research Funds for the Central Universities
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We apply a recently proposed covariant power counting in nucleon-nucleon interactions to study strangeness S=-1 AN - LW interactions in chiral effective field theory. At leading order, Lorentz invariance introduces 12 low energy constants, in contrast to the heavy baryon approach, where only five appear. The Kadyshevsky equation is adopted to resum the potential in order to account for the non-perturbative nature of hyperon-nucleon interactions. A fit to the 36 hyperon-nucleon scattering data points yields chi(2) similar or equal to 16, which is comparable with the sophisticated phenomenological models and the next-to-leading order heavy baryon approach. However, one cannot achieve a simultaneous description of the nucleon-nucleon phase shifts and strangeness S=-1 hyperon-nucleon scattering data at leading order.
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