1 Ocak 2023 Dergi makalesi Açık Erişim

CERN İşbirliği

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<oai_dc:dc xmlns:dc="http://purl.org/dc/elements/1.1/" xmlns:oai_dc="http://www.openarchives.org/OAI/2.0/oai_dc/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://www.openarchives.org/OAI/2.0/oai_dc/ http://www.openarchives.org/OAI/2.0/oai_dc.xsd">
  <dc:creator>CERN İşbirliği</dc:creator>
  <dc:date>2023-01-01</dc:date>
  <dc:description>Annihilation dynamics plays a fundamental role in the baryon–antibaryon interaction ($\mathrm{B–}\stackrel{‾}{B}$) at low-energy and its strength and range are crucial in the assessment of possible baryonic bound states. Experimental data on annihilation cross sections are available for the $\mathrm{p–}\stackrel{‾}{p}$ system but not in the low relative momentum region. Data regarding the $\mathrm{B–}\stackrel{‾}{B}$ interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon–antinucleon ($\mathrm{N–}\stackrel{‾}{N}$) results, when available. In this letter we present a measurement of the $\mathrm{p–}\stackrel{‾}{p}$, $\mathrm{p–}\stackrel{‾}{\Lambda }\oplus \stackrel{‾}{p}\text{–}\Lambda $ and $\Lambda \text{–}\stackrel{‾}{\Lambda }$ interaction using correlation functions in the relative momentum space in high-multiplicity triggered pp collisions at $\sqrt{s}\phantom{\rule{0.25em}{0ex}}=\phantom{\rule{0.25em}{0ex}}13$ TeV recorded by ALICE at the LHC. In the $\mathrm{p–}\stackrel{‾}{p}$ system the couplings to the mesonic channels in different partial waves are extracted by adopting a coupled-channel approach with recent χEFT potentials. The inclusion of these inelastic channels provides good agreement with the data, showing a significant presence of the annihilation term down to zero momentum. Predictions obtained using the Lednický–Lyuboshits formula and scattering parameters obtained from heavy-ion collisions, hence mainly sensitive to elastic processes, are compared with the experimental $\mathrm{p–}\stackrel{‾}{\Lambda }\oplus \stackrel{‾}{p}\text{–}\Lambda $ and $\Lambda \text{–}\stackrel{‾}{\Lambda }$ correlations. The model describes the $\Lambda \text{–}\stackrel{‾}{\Lambda }$ data and underestimates the $\mathrm{p–}\stackrel{‾}{\Lambda }\oplus \stackrel{‾}{p}\text{–}\Lambda $ data in the region of momenta below 200 MeV/c. The observed deviation indicates a different contribution of annihilation channels to the two systems containing strange hadrons.</dc:description>
  <dc:identifier>https://aperta.ulakbim.gov.trrecord/264718</dc:identifier>
  <dc:identifier>oai:aperta.ulakbim.gov.tr:264718</dc:identifier>
  <dc:rights>info:eu-repo/semantics/openAccess</dc:rights>
  <dc:rights>http://www.opendefinition.org/licenses/cc-by</dc:rights>
  <dc:source>Physics Letters B 829 C</dc:source>
  <dc:title>Investigating the role of strangeness in baryon–antibaryon annihilation at the LHC</dc:title>
  <dc:type>info:eu-repo/semantics/article</dc:type>
  <dc:type>publication-article</dc:type>
</oai_dc:dc>