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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Hadron Structure and Spectroscopy V

HK 33.5: Vortrag

Mittwoch, 20. März 2019, 15:30–15:45, HS 13

Kaon-proton femtoscopy in ALICE: going beyond scattering experiments — •Valentina Mantovani Sarti for the ALICE collaboration — TUM Munich

Scattering experiments have been one of the main sources of information on hadron-hadron interactions. The large amount of such data in the nucleon-nucleon sector allows the development of a solid and deep knowledge of the nucleon-nucleon interaction.
The situation is completely different when a new degree of freedom such as strangeness is introduced.
In the meson-baryon sector the K⁻-nucleon interaction relies only on old and rather imprecise scattering data above threshold and on the kaonic atom measurement at threshold. More data are needed to constrain this low-energy QCD regime where chiral symmetry breaking is dominant and where a molecular state as the Λ (1405) is present.
In this talk we present the latest femtoscopy measurements for kaon-proton pairs in pp collisions from ALICE which provide a complementary tool to measure the kaon-proton strong interactions in the low momenta regime with a high precision. We will show results on the K⁺-proton and K⁻-proton correlation function in pp collisions at √s = 5,7 and 13 TeV.
The high-precision femtoscopic data from ALICE provide a unique opportunity to test the predictions of theoretical models. In particular, they are useful at low momenta where they provide experimental evidence for the first time of the opening of the coupled isospin breaking channel K^0-n.