Paper
First measurement of the strong interaction scattering parameters for the $\mathbf{K^-d}$ and $\mathbf{K^+d}$ systems
Authors
ALICE Collaboration
Abstract
Charged kaon--deuteron interactions offer a sensitive probe of the strangeness sector of QCD at low energy, particularly through their scattering parameters. Despite available theoretical predictions, experimental constraints remain absent, particularly for the $\rm K^{-}d$ system. The first measurement of femtoscopic correlation functions for $\rm K^{-}d \oplus K^{+}\overline{d}$ and $\rm K^{+}d \oplus K^{-}\overline{d}$ particle pairs in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV recorded by ALICE at the LHC is presented. Correlation functions for both systems are analyzed in three centrality classes and fitted using the Lednický--Lyuboshitz model to extract the source size and strong interaction scattering lengths. The $\rm K^{-}d$ scattering length is found to be $\Re f_0 = -1.44 \pm 0.15\text{ (stat.)}^{+0.10}_{-0.10}$ (syst.) fm and $\Im f_0 = 1.34 \pm 0.33$ (stat.)$^{+0.21}_{-0.15}$ (syst.) fm, while for $\rm K^{+}d$ the value $\Re f_0 = -0.68 \pm 0.16$ (stat.)$^{+0.09}_{-0.09}$ (syst.) fm is obtained. These results provide the first constraints on the $\rm K^{\pm} d$ interaction modeling at low energy, delivering a long-awaited experimental benchmark for testing chiral QCD dynamics.
Metadata
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Raw Data (Debug)
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"raw_xml": "<entry>\n <id>http://arxiv.org/abs/2602.22833v1</id>\n <title>First measurement of the strong interaction scattering parameters for the $\\mathbf{K^-d}$ and $\\mathbf{K^+d}$ systems</title>\n <updated>2026-02-26T10:18:44Z</updated>\n <link href='https://arxiv.org/abs/2602.22833v1' rel='alternate' type='text/html'/>\n <link href='https://arxiv.org/pdf/2602.22833v1' rel='related' title='pdf' type='application/pdf'/>\n <summary>Charged kaon--deuteron interactions offer a sensitive probe of the strangeness sector of QCD at low energy, particularly through their scattering parameters. Despite available theoretical predictions, experimental constraints remain absent, particularly for the $\\rm K^{-}d$ system. The first measurement of femtoscopic correlation functions for $\\rm K^{-}d \\oplus K^{+}\\overline{d}$ and $\\rm K^{+}d \\oplus K^{-}\\overline{d}$ particle pairs in Pb--Pb collisions at $\\sqrt{s_{\\rm NN}}=5.02$ TeV recorded by ALICE at the LHC is presented. Correlation functions for both systems are analyzed in three centrality classes and fitted using the Lednický--Lyuboshitz model to extract the source size and strong interaction scattering lengths. The $\\rm K^{-}d$ scattering length is found to be $\\Re f_0 = -1.44 \\pm 0.15\\text{ (stat.)}^{+0.10}_{-0.10}$ (syst.) fm and $\\Im f_0 = 1.34 \\pm 0.33$ (stat.)$^{+0.21}_{-0.15}$ (syst.) fm, while for $\\rm K^{+}d$ the value $\\Re f_0 = -0.68 \\pm 0.16$ (stat.)$^{+0.09}_{-0.09}$ (syst.) fm is obtained. These results provide the first constraints on the $\\rm K^{\\pm} d$ interaction modeling at low energy, delivering a long-awaited experimental benchmark for testing chiral QCD dynamics.</summary>\n <category scheme='http://arxiv.org/schemas/atom' term='nucl-ex'/>\n <category scheme='http://arxiv.org/schemas/atom' term='hep-ex'/>\n <published>2026-02-26T10:18:44Z</published>\n <arxiv:comment>20 pages, 3 captioned figures, authors from page 15, submitted to PRL, figures at http://alice-publications.web.cern.ch/node/13110</arxiv:comment>\n <arxiv:primary_category term='nucl-ex'/>\n <author>\n <name> ALICE Collaboration</name>\n </author>\n </entry>"
}