The study of the strength and behavior of the antikaon-nucleon (K̄N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K+p⊕K-p) and (K-p⊕K+p) pairs measured in pp collisions at s=5, 7, and 13 TeV are reported. A structure observed around a relative momentum of 58 MeV/c in the measured correlation function of (K-p⊕K+p) with a significance of 4.4σ constitutes the first experimental evidence for the opening of the (K̄0n.K0n) isospin breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to Jülich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the K̄N threshold for low-energy QCD chiral models.

Scattering Studies with Low-Energy Kaon-Proton Femtoscopy in Proton-Proton Collisions at the LHC

Camerini P.;Contin G.;Faggin M.;Fragiacomo E.;Lea R.;Luparello G.;Margagliotti G. V.;Piano S.;Rui R.;Zaccolo V.;
2020-01-01

Abstract

The study of the strength and behavior of the antikaon-nucleon (K̄N) interaction constitutes one of the key focuses of the strangeness sector in low-energy quantum chromodynamics (QCD). In this Letter a unique high-precision measurement of the strong interaction between kaons and protons, close and above the kinematic threshold, is presented. The femtoscopic measurements of the correlation function at low pair-frame relative momentum of (K+p⊕K-p) and (K-p⊕K+p) pairs measured in pp collisions at s=5, 7, and 13 TeV are reported. A structure observed around a relative momentum of 58 MeV/c in the measured correlation function of (K-p⊕K+p) with a significance of 4.4σ constitutes the first experimental evidence for the opening of the (K̄0n.K0n) isospin breaking channel due to the mass difference between charged and neutral kaons. The measured correlation functions have been compared to Jülich and Kyoto models in addition to the Coulomb potential. The high-precision data at low relative momenta presented in this work prove femtoscopy to be a powerful complementary tool to scattering experiments and provide new constraints above the K̄N threshold for low-energy QCD chiral models.
File in questo prodotto:
File Dimensione Formato  
PRL_124(2020)092301_1-13.pdf

accesso aperto

Tipologia: Documento in Versione Editoriale
Licenza: Creative commons
Dimensione 760.29 kB
Formato Adobe PDF
760.29 kB Adobe PDF Visualizza/Apri
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2965179
Citazioni
  • ???jsp.display-item.citation.pmc??? 2
  • Scopus 40
  • ???jsp.display-item.citation.isi??? 35
social impact