Annihilation dynamics plays a fundamental role in the baryon–antibaryon interaction () 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 system but not in the low relative momentum region. Data regarding the interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon–antinucleon () results, when available. In this letter we present a measurement of the , and interaction using correlation functions in the relative momentum space in high-multiplicity triggered pp collisions at TeV recorded by ALICE at the LHC. In the 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 and correlations. The model describes the data and underestimates the 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.

Investigating the role of strangeness in baryon\textendash{}antibaryon annihilation at the LHC / Acharya, S., Adamová, D., Adler, A., Adolfsson, J., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S.U., Ahuja, I., Akbar, Z., Akindinov, A., Al-Turany, M., Alam, S.N., Aleksandrov, D., Alessandro, B., Alfanda, H.M., Alfaro Molina, R., Ali, B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 829:(2022), pp. 1-15. [10.1016/j.physletb.2022.137060]

Investigating the role of strangeness in baryon\textendash{}antibaryon annihilation at the LHC

L. Cunqueiro
Membro del Collaboration Group
;
2022

Abstract

Annihilation dynamics plays a fundamental role in the baryon–antibaryon interaction () 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 system but not in the low relative momentum region. Data regarding the interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon–antinucleon () results, when available. In this letter we present a measurement of the , and interaction using correlation functions in the relative momentum space in high-multiplicity triggered pp collisions at TeV recorded by ALICE at the LHC. In the 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 and correlations. The model describes the data and underestimates the 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.
2022
strangeness enhancement; heavy ion collisions; ALICE experiment
01 Pubblicazione su rivista::01a Articolo in rivista
Investigating the role of strangeness in baryon\textendash{}antibaryon annihilation at the LHC / Acharya, S., Adamová, D., Adler, A., Adolfsson, J., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahmad, S., Ahn, S.U., Ahuja, I., Akbar, Z., Akindinov, A., Al-Turany, M., Alam, S.N., Aleksandrov, D., Alessandro, B., Alfanda, H.M., Alfaro Molina, R., Ali, B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 829:(2022), pp. 1-15. [10.1016/j.physletb.2022.137060]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1655107
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