Investigating the role of strangeness in baryon$-$antibaryon annihilation at the LHC

Abstract

Annihilation dynamics plays a fundamental role in the baryon$-$antibaryon interaction (B$-\overline{\mathrm{B}}$) 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$-\overline{\mathrm{p}}$ system but not in the low relative momentum region. Data regarding the B$-\overline{\mathrm{B}}$ interaction with strange degrees of freedom are extremely scarce, hence the modeling of the annihilation contributions is mainly based on nucleon$-$antinucleon (N$-\overline{\mathrm{N}}$) results, when available. In this letter we present a measurement of the p$-\overline{\mathrm{p}}$, p$-\overline{\Lambda }\oplus \overline{\mathrm{p}}-\mathrm{\Lambda }$ and $\Lambda -\overline{\Lambda }$ interaction using correlation functions in the relative momentum space in high-multiplicity triggered pp collisions at $\sqrt{s}=13$ TeV recorded by ALICE at the LHC. In the p$-\overline{\mathrm{p}}$ system the couplings to the mesonic channels in different partial waves are extracted by adopting a coupled-channel approach with recent $\chi \mathrm{EFT}$ 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$-\overline{\Lambda }\oplus \overline{\mathrm{p}}-\mathrm{\Lambda }$ and $\Lambda -\overline{\Lambda }$ correlations. The model describes the $\Lambda -\overline{\Lambda }$ data and underestimates the p$-\overline{\Lambda }\oplus \overline{\mathrm{p}}-\mathrm{\Lambda }$ 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.

arXiv comment22 pages, 6 captioned figures, authors from page 17, published version, figures at http://alice-publications.web.cern.ch/node/7075 (with ROR in author list xml file for inspire)

References in corpus (34)

• An Introduction to PYTHIA 8.2
• EPOS LHC : test of collective hadronization with LHC data
• Performance of the ALICE Experiment at the CERN LHC
• The ALICE TPC, a large 3-dimensional tracking device with fast readout for ultra-high multiplicity events
• Femtoscopy in Relativistic Heavy Ion Collisions: Two Decades of Progress
• Performance of the ALICE VZERO system
• Alignment of the ALICE Inner Tracking System with cosmic-ray tracks
• Observation of a near-threshold enhancement in th p pbar mass spectrum from radiative J/psi-->gamma p pbar decays
• Unveiling the strong interaction among hadrons at the LHC
• Thermal-FIST: A package for heavy-ion collisions and hadronic equation of state
• Study of the strong interaction among hadrons with correlations at the LHC
• p-p, p-$\Lambda$ and $\Lambda$-$\Lambda$ correlations studied via femtoscopy in pp reactions at $\sqrt{s}$ = 7 TeV
• First observation of an attractive interaction between a proton and a multi-strange baryon
• Study of the $\Lambda$-$\Lambda$ interaction with femtoscopy correlations in pp and p-Pb collisions at the LHC
• Search for a common baryon source in high-multiplicity pp collisions at the LHC
• The GlueX Beamline and Detector
• Scattering studies with low-energy kaon-proton femtoscopy in proton-proton collisions at the LHC
• Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative Decays
• Investigation of the p-${\Sigma }^0$ interaction via femtoscopy in pp collisions
• A femtoscopic Correlation Analysis Tool using the Schrödinger equation (CATS)
• Coupled-channel effects in hadron-hadron correlation functions
• Paris nucleon-antinucleon potential constrained by recent antiprotonic-atom data and antineutron-proton total cross sections
• $K^{-}p$ Correlation Function from High-Energy Nuclear Collisions and Chiral SU(3) Dynamics
• Proton-lambda correlations in central Au+Au collisions at sqrt (s_NN)=200 GeV
• Antinucleon-nucleon interaction at next-to-next-to-next-to-leading order in chiral effective field theory
• Energy-dependent partial-wave analysis of all antiproton-proton scattering data below 925 MeV/c
• Extracting baryon-antibaryon strong interaction potentials from p$\bar{\Lambda }$ femtoscopic correlation function
• Kaon-proton strong interaction at low relative momentum via femtoscopy in Pb-Pb collisions at the LHC
• Origin of the structures observed in $e^{+}{e}^{-}$ annihilation into multipion states around the $\bar{p}p$ threshold
• A Three-Flavor Chiral Effective Model with Four Baryonic Multiplets within the Mirror Assignment
• Measurement of strange baryon-antibaryon interactions with femtoscopic correlations
• Baryon-antibaryon annihilation and reproduction in relativistic heavy-ion collisions
• Extraction of baryonia from the lightest anti-protonic atoms
• Measurement of the branching fraction and decay rate asymmetry of B- --> D_{pi+pi-pi0}K-

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• Constraining the $\overline{\mathrm{K}}\mathrm{N}$ coupled channel dynamics using femtoscopic correlations at the LHC
• Femtoscopic signatures of the lightest S-wave scalar open-charm mesons
• Accessing the strong interaction between $\Lambda$ baryons and charged kaons with the femtoscopy technique at the LHC
• Strangeness $S=-2$ baryon-baryon interactions and femtoscopic correlation functions in covariant chiral effective field theory
• Studying the interaction between charm and light-flavor mesons
• Indication of a p-$\varphi$ bound state from a correlation function analysis
• Towards the understanding of the genuine three-body interaction for p$-$p$-$p and p$-$p$-\Lambda$
• Study of the p$-$p$-$K${}^{+}$ and p$-$p$-$K${}^{-}$ dynamics using the femtoscopy technique
• Investigation of K${}^{+}$K${}^{-}$ interactions via femtoscopy in Pb$-$Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV at the LHC
• Investigating the p-${\pi }^{\pm }$ and p-p-${\pi }^{\pm }$ dynamics with femtoscopy in pp collisions at $\sqrt{s}=13$ TeV
• Baryon-antibaryon photoproduction cross sections off the proton