Σ[bar]± production in pp and p−Pb collisions at √sNN = 5.02 TeV with ALICE
The transverse momentum spectra and integrated yields of anti-Σ hyperons (Σ[bar]±) have been measured in pp and p-Pb collisions at √sNN=5.02TeV with the ALICE experiment. Measurements are performed via the newly accessed decay channel $$\overline{\Sigma }^{\pm } \!\!\rightarrow \mathrm{\overline{n}}...
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| Main Authors: | , , , , , , , , , , , , , , , , , , , |
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| Corporate Author: | |
| Format: | Article (Journal) |
| Language: | English |
| Published: |
09 February 2026
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| In: |
The European physical journal. C, Particles and fields
Year: 2026, Volume: 86, Issue: 2, Pages: 1-23 |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-025-15129-2 |
| Online Access: | Verlag, kostenfrei, Volltext: https://doi.org/10.1140/epjc/s10052-025-15129-2
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| Author Notes: | ALICE Collaboration |
| Summary: | The transverse momentum spectra and integrated yields of anti-Σ hyperons (Σ[bar]±) have been measured in pp and p-Pb collisions at √sNN=5.02TeV with the ALICE experiment. Measurements are performed via the newly accessed decay channel $$\overline{\Sigma }^{\pm } \!\!\rightarrow \mathrm{\overline{n}} \pi ^{\pm }$$. A new method of antineutron reconstruction with the PHOS electromagnetic spectrometer is developed and applied to this analysis. The $$p_{\textrm{T}}$$spectra of $$\overline{\Sigma }^{\pm } $$are measured in the range $$0.5<p_{\textrm{T}} <3$$GeV/$$c$$and compared to predictions of the PYTHIA 8, DPMJET, PHOJET, EPOS LHC and EPOS4 models. The EPOS LHC and EPOS4 models provide the best descriptions of the measured spectra both in $$\text {pp}$$and $$\text {p}{-}\text {Pb}$$collisions, while models which do not account for multiparton interactions provide a considerably worse description at high $$p_{\textrm{T}}$$. The total yields of $$\overline{\Sigma }^{\pm } $$in both $$\text {pp}$$and $$\text {p}{-}\text {Pb}$$collisions are compared to predictions of the Thermal-FIST model and dynamical models PYTHIA 8, DPMJET, PHOJET, EPOS LHC and EPOS4. All models reproduce the total yields in both colliding systems within uncertainties. The nuclear modification factors $$R_\textrm{pPb}$$for both $$\overline{\Sigma }^{+} $$and $$\overline{\Sigma }^{-} $$are evaluated and compared to those of protons, $$\Lambda $$and $$\Xi $$hyperons, and predictions of EPOS LHC and EPOS4 models. No deviations of $$R_\textrm{pPb}$$for $$\overline{\Sigma }^{\pm } $$from the model predictions or measurements for other hadrons are found within uncertainties. |
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| Item Description: | Im Titel sind ± hochgestellt ALICE Collaboration: I.J. Abualrob, V. Anguelov, A. Berdnikova, L. Bergmann, A.G. Borquez Carcamo, I. Fokin, P. Glässel, N.A. Grünwald, M.W. Menzel, A. Nath, K. Reygers, R. Schicker, F. Schlepper, J.J. Seo, G. Skorodumovs, J. Stachel, S.F. Stiefelmaier, C.A. van Veen, B. Windelband, A. Yuncu, F. Zanone [und viele weitere] Im Titel steht der Ausdruck "sNN" unter dem Wurzelsymbol Im Titel steht Sigma Buchstabe mit einem Oberstrich Gesehen am 25.06.2026 |
| Physical Description: | Online Resource |
| ISSN: | 1434-6052 |
| DOI: | 10.1140/epjc/s10052-025-15129-2 |