1 Ocak 2023 Dergi makalesi Açık Erişim

CERN İşbirliği

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{
  "DOI": "10.1016/j.physletb.2022.137060", 
  "abstract": "<p>Annihilation dynamics plays a fundamental role in the baryon\u2013antibaryon interaction ($\\mathrm{B\u2013}\\stackrel{\u203e}{B}$) 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 $\\mathrm{p\u2013}\\stackrel{\u203e}{p}$ system but not in the low relative momentum region. Data regarding the $\\mathrm{B\u2013}\\stackrel{\u203e}{B}$ interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon\u2013antinucleon ($\\mathrm{N\u2013}\\stackrel{\u203e}{N}$) results, when available. In this letter we present a measurement of the $\\mathrm{p\u2013}\\stackrel{\u203e}{p}$, $\\mathrm{p\u2013}\\stackrel{\u203e}{\\Lambda }\\oplus \\stackrel{\u203e}{p}\\text{\u2013}\\Lambda $ and $\\Lambda \\text{\u2013}\\stackrel{\u203e}{\\Lambda }$ 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 $\\mathrm{p\u2013}\\stackrel{\u203e}{p}$ system the couplings to the mesonic channels in different partial waves are extracted by adopting a coupled-channel approach with recent \u03c7EFT 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 Lednick\u00fd\u2013Lyuboshits formula and scattering parameters obtained from heavy-ion collisions, hence mainly sensitive to elastic processes, are compared with the experimental $\\mathrm{p\u2013}\\stackrel{\u203e}{\\Lambda }\\oplus \\stackrel{\u203e}{p}\\text{\u2013}\\Lambda $ and $\\Lambda \\text{\u2013}\\stackrel{\u203e}{\\Lambda }$ correlations. The model describes the $\\Lambda \\text{\u2013}\\stackrel{\u203e}{\\Lambda }$ data and underestimates the $\\mathrm{p\u2013}\\stackrel{\u203e}{\\Lambda }\\oplus \\stackrel{\u203e}{p}\\text{\u2013}\\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.</p>", 
  "author": [
    {
      "family": "CERN \u0130\u015fbirli\u011fi"
    }
  ], 
  "container_title": "Physics Letters B", 
  "id": "264718", 
  "issued": {
    "date-parts": [
      [
        2023, 
        1, 
        1
      ]
    ]
  }, 
  "title": "Investigating the role of strangeness in baryon\u2013antibaryon annihilation at the LHC", 
  "type": "article-journal", 
  "volume": "829 C"
}