Surprises in threshold antikaon-nucleon physics

Details Surprises in threshold antikaon-nucleon physics Surprises in threshold antikaon-nucleon physics

2005-08-06

arxiv.org/abs/hep-ph/0508081v1

Phys.Rev.Lett. 95 (2005) 172502

Physics

High Energy Physics

High Energy Physics - Phenomenology

Scientific paper

10.1103/PhysRevLett.95.172502

Low energy \bar{K}N interactions are studied within Unitary Chiral Perturbation Theory at next-to-leading order with ten coupled channels. We pay special attention to the recent precise determination of the strong shift and width of the kaonic hydrogen 1s state by the DEAR Collaboration that has challenged our theoretical understanding of this sector of strong interactions. We typically find two classes of solutions, both of them reproducing previous data, that either can or cannot accommodate the DEAR measurements. The former class has not been previously discussed.

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