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

Autori
Acharya, S. ; ... ; Erhardt, Filip ; ... ; Gotovac, Sven ; ... ; Jerčić, Marko ; ... ; Karatović, David ; ... ; Lončar, Petra ; ... ; Mudnić, Eugen ; ... ; Planinić, Mirko ; ... ; Poljak, Nikola ; ... ; Vicković, Linda ; ... ; Zurlo, N.

Kolaboracija
ALICE Collaboration

Izvornik
Physics Letters B (0370-2693) 822 (2021); 136708, 14

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
K p: strong interaction ; heavy ion: scattering ; momentum: correlation ; force: Coulomb ; effective field theory: chiral ; atom: exotic ; nucleon: pair ; heavy ion, scattering ; momentum, correlation ; force, Coulomb ; effective field theory, chiral ; atom, exotic ; nucleon, pair ; CERN LHC Coll ; two-particle ; measurement methods ; sensitivity ; strong interaction ; ALICE ; kinematics ; TeV ; scattering length ; experimental results ; 5020 GeV-cms/nucleon ; hadron

Sažetak
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→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+p) and K+p(K−p) pairs in Pb-Pb collisions at centre-of-mass energy per nucleon pair of √sNN=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 ℜf0 =−0.91±0.03(stat) −0.03+0.17(syst) and ℑf0=0.92± 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.

Izvorni jezik
Engleski

Znanstvena područja
Fizika

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