Scattering studies with low-energy kaon-proton femtoscopy in proton-proton collisions at the LHC - INSPIRE

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Scattering studies with low-energy kaon-proton femtoscopy in proton-proton collisions at the LHC

ALICE

Collaboration

May 31, 2019

16 pages

Published in:

Phys.Rev.Lett. 124 (2020) 9, 092301

Published: Mar 6, 2020

e-Print:

1905.13470 [nucl-ex]

DOI:

10.1103/PhysRevLett.124.092301

Report number:

CERN-EP-2019-118

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (APS)

The study of the strength and behavior of the antikaon-nucleon (K¯N) 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 (K¯0n⊕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 K¯N threshold for low-energy QCD chiral models.

Note:

16 pages, 2 captioned figures, authors from page 11, published version, figures at http://alice-publications.web.cern.ch/node/5322

Nuclear Physics
p p: scattering
model: chiral
anti-K nucleon: interaction
quantum chromodynamics
correlation function
strong interaction
mass difference
CERN LHC Coll
strangeness

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Figures(2)

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