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Measurement of differential cross sections for Σ+p elastic scattering in the momentum range 0.44–0.80 GeV/c
- Source :
- Progress of Theoretical and Experimental Physics. 2022
- Publication Year :
- 2022
- Publisher :
- Oxford University Press (OUP), 2022.
-
Abstract
- We performed a novel Σ⁺+p scattering experiment at the J-PARC Hadron Experimental Facility. Approximately 2400 Σ⁺+p elastic scattering events were identified from 4.9 × 10⁷ tagged Σ⁺+ particles in the Σ⁺+ momentum range 0.44-0.80 GeV/c. The differential cross sections of the Σ⁺+p elastic scattering were derived with much better precision than in previous experiments. The obtained differential cross sections were approximately 2 mb/sr or less, which were not as large as those predicted by the fss2 and FSS models based on the quark cluster model in the short-range region. By performing phase-shift analyses for the obtained differential cross sections, we experimentally derived the phase shifts of the ³S₁ and ¹P₁ channels for the first time. The phase shift of the ³S₁ channel, where a large repulsive core was predicted owing to the Pauli effect between quarks, was evaluated as 20° < |δ₃S₁| < 35°. If the sign of δ₃S₁ is assumed to be negative, the interaction in this channel is moderately repulsive, as the Nijmegen extended-sort-core models predicted.<br />クォーク間の「芯」をとらえた --物質が安定して存在できる理由の理解に貢献--. 京都大学プレスリリース. 2022-09-05.
- Subjects :
- General Physics and Astronomy
D14
Nuclear Physics
Subjects
Details
- ISSN :
- 20503911
- Volume :
- 2022
- Database :
- OpenAIRE
- Journal :
- Progress of Theoretical and Experimental Physics
- Accession number :
- edsair.doi.dedup.....d40ec50fd5de3508967855af0ea0e7b7