A1 Journal article (refereed)
Investigating the role of strangeness in baryon–antibaryon annihilation at the LHC (2022)


ALICE Collaboration. (2022). Investigating the role of strangeness in baryon–antibaryon annihilation at the LHC. Physics Letters B, 829, Article 137060. https://doi.org/10.1016/j.physletb.2022.137060


JYU authors or editors


Publication details

All authors or editorsALICE Collaboration

Journal or seriesPhysics Letters B

ISSN0370-2693

eISSN1873-2445

Publication year2022

Publication date04/04/2022

Volume829

Article number137060

PublisherElsevier BV

Publication countryNetherlands

Publication languageEnglish

DOIhttps://doi.org/10.1016/j.physletb.2022.137060

Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/82478

Web address of parallel published publication (pre-print)https://arxiv.org/abs/2105.05190


Abstract

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.


Keywordsparticle physics


Contributing organizations


Ministry reportingYes

VIRTA submission year2022

JUFO rating2


Last updated on 2024-12-10 at 13:45