Investigating the role of strangeness in baryon-antibaryon annihilation at the LHC
Annihilation dynamics plays a fundamental role in the baryon-antibaryon interaction (B-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 p-p‾ system but not in the low r...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
4 April 2022
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| In: |
Physics letters
Year: 2022, Volume: 829, Pages: 1-15 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2022.137060 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2022.137060 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S0370269322001940 
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| Author Notes: | ALICE collaboration* |
MARC
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| 500 | |a ALICE collaboration*: S. Acharya, V. Anguelov, M. Arslandok, A. Berdnikova, L. Bergmann, M.C. Danisch, V.J.G. Feuillard, P. Glässel, J. Kim, M. Kim, M.K. Köhler, M. Kroesen, J.A. Lopez, A. Nath, Y. Pachmayer, K. Reygers, R. Schicker, A. Schmah, M.O. Schmidt, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, M.A. Völkl, B. Windelband, A. Yuncu [und 1000 weitere] | ||
| 520 | |a Annihilation dynamics plays a fundamental role in the baryon-antibaryon interaction (B-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 p-p‾ system but not in the low relative momentum region. Data regarding the B-B‾ interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon-antinucleon (N-N‾) results, when available. In this letter we present a measurement of the p-p‾, p-Λ‾⊕p‾-Λ and Λ-Λ‾ interaction using correlation functions in the relative momentum space in high-multiplicity triggered pp collisions at s=13 TeV recorded by ALICE at the LHC. In the p-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 p-Λ‾⊕p‾-Λ and Λ-Λ‾ correlations. The model describes the Λ-Λ‾ data and underestimates the p-Λ‾⊕p‾-Λ 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. | ||
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