A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Investigation of the p–Σ0 interaction via femtoscopy in pp collisions (2020)
ALICE Collaboration. (2020). Investigation of the p–Σ0 interaction via femtoscopy in pp collisions. Physics Letters B, 805, Article 135419. https://doi.org/10.1016/j.physletb.2020.135419
JYU-tekijät tai -toimittajat
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Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: ALICE Collaboration
Lehti tai sarja: Physics Letters B
ISSN: 0370-2693
eISSN: 1873-2445
Julkaisuvuosi: 2020
Volyymi: 805
Artikkelinumero: 135419
Kustantaja: Elsevier
Julkaisumaa: Alankomaat
Julkaisun kieli: englanti
DOI: https://doi.org/10.1016/j.physletb.2020.135419
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Kokonaan avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/68853
Julkaisu on rinnakkaistallennettu: https://iris.unito.it/retrieve/handle/2318/1736855/605823/PLB_805_2020_135419.pdf
Rinnakkaistallenteen verkko-osoite (pre-print): https://arxiv.org/abs/1910.14407
Tiivistelmä
This Letter presents the first direct investigation of the p–Σ0 interaction, using the femtoscopy technique in high-multiplicity pp collisions at s=13 TeV measured by the ALICE detector. The Σ0 is reconstructed via the decay channel to Λγ, and the subsequent decay of Λ to pπ−. The photon is detected via the conversion in material to e+e− pairs exploiting the capability of the ALICE detector to measure electrons at low transverse momenta. The measured p–Σ0 correlation indicates a shallow strong interaction. The comparison of the data to several theoretical predictions obtained employing the Correlation Analysis Tool using the Schrödinger Equation (CATS) and the Lednický–Lyuboshits approach shows that the current experimental precision does not yet allow to discriminate between different models, as it is the case for the available scattering and hypernuclei data. Nevertheless, the p–Σ0 correlation function is found to be sensitive to the strong interaction, and driven by the interplay of the different spin and isospin channels. This pioneering study demonstrates the feasibility of a femtoscopic measurement in the p–Σ0 channel and with the expected larger data samples in LHC Run 3 and Run 4, the p–Σ0 interaction will be constrained with high precision.
YSO-asiasanat: hiukkasfysiikka
Vapaat asiasanat: hypernuclei; hyperons
Liittyvät organisaatiot
OKM-raportointi: Kyllä
VIRTA-lähetysvuosi: 2020
JUFO-taso: 2
