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

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The ALICE Collaboration , Acharya , S , Adamova , D , Kim , D J , Krizek , F , Novitzky , N , Onnerstad , A , Parkkila , J E , Rytkönen , H M , Räsänen , S , Saarimäki , O A M , Slupecki , M & Trzaska , W H 2021 , ' Kaon-proton strong interaction at low relative momentum via femtoscopy in Pb-Pb collisions at the LHC ' , Physics Letters B , vol. 822 , 136708 . https://doi.org/10.1016/j.physletb.2021.136708

Title: Kaon-proton strong interaction at low relative momentum via femtoscopy in Pb-Pb collisions at the LHC
Author: The ALICE collaboration; Acharya, S.; Adamova, D.; Kim, D. J.; Krizek, F.; Novitzky, Norbert; Onnerstad, A.; Parkkila, J. E.; Rytkönen, Heidi Maria; Räsänen, Sami; Saarimäki, Oskari Antti Matti; Slupecki, M.; Trzaska, W. H.
Other contributor: University of Helsinki, University of Jyväskylä
University of Helsinki, The Czech Academy of Sciences
University of Helsinki, University of Tsukuba
University of Helsinki, University of Jyväskylä
University of Helsinki, University of Jyväskylä
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, Helsinki Institute of Physics
University of Helsinki, University of Jyväskylä
Date: 2021-11-10
Language: eng
Number of pages: 14
Belongs to series: Physics Letters B
ISSN: 0370-2693
DOI: https://doi.org/10.1016/j.physletb.2021.136708
URI: http://hdl.handle.net/10138/336709
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 -> 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) over bar) and K+p (K-(p) over bar) pairs in Pb-Pb collisions at centre-of-mass energy per nucleon pair of root 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 Rf(0) = -0.91 +/- 0.03(stat)(-0.03)(+0.17) (syst) and Sf(0) = 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. (C) 2021 ALICE, European Organization for Nuclear Research. Published by Elsevier B.V.
Subject: 114 Physical sciences
LOW-ENERGY K
DA-PHI-NE
SCATTERING
SPECTROSCOPY
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