Kaon-proton strong interaction at low relative momentum via femtoscopy in Pb-Pb collisions at the LHC

Abstract

In quantum scattering processes between two particles, aspects characterizing the strong and Coulomb forces can be observed in kinematic distributions of the particle pairs. The sensitivity to the interaction potential reaches a maximum at low relative momentum and vanishing distance between the two particles. Ultrarelativistic heavy-ion collisions at the LHC provide an abundant source of many hadron species and can be employed as a measurement method of scattering parameters that is complementary to scattering experiments. This study confirms that momentum correlations of particles produced in Pb-Pb collisions at the LHC provide an accurate measurement of kaon-proton scattering parameters at low relative momentum, allowing precise access to the $K^{-}p\to K^{-}p$ process. This work also validates the femtoscopic measurement in ultrarelativistic heavy-ion collisions as an alternative to scattering experiments and a complementary tool to the study of exotic atoms with comparable precision. In this work, the first femtoscopic measurement of momentum correlations of $K^{-}p(K^{+}\overline{p})$ and $K^{+}p(K^{-}\overline{p})$ pairs in Pb-Pb collisions at centre-of-mass energy per nucleon pair of $\sqrt{s_{\mathrm{NN}}}=5.02$ TeV registered by the ALICE experiment is reported. The components of the $K^{-}p$ complex scattering length are extracted and found to be $\Re f_0=-0.91\pm 0.03$(stat)${}_{-0.03}^{+0.17}$(syst) and $\Im f_0=0.92\pm 0.05$(stat)${}_{-0.33}^{+0.12}$(syst). The results are compared with chiral effective field theory predictions as well as with existing data from dedicated scattering and exotic kaonic atom experiments.

25 pages, 3 captioned figure, 4 tables, authors from page 18, published version, figures at http://alice-publications.web.cern.ch/node/7088

References in corpus (8)

• Hydrodynamic Models for Heavy Ion Collisions
• K^- p scattering length from scattering experiments
• Unveiling the strong interaction among hadrons at the LHC
• Particle spectra in Pb-Pb collisions at 2.76 TeV
• Initial condition for hydrodynamics, partonic free streaming, and the uniform description of soft observables at RHIC
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: bulk properties and dynamical evolution
• Pion-kaon femtoscopy and the lifetime of the hadronic phase in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 2.76 TeV
• Partial-wave analysis of $K^{+}$ nucleon scattering

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