Research output: Contribution to journal › Article › peer-review
First Study of Antihyperon-Nucleon Scattering Λ¯p→Λ¯p and Measurement of Λp→Λp Cross Section. / BESIII Collaboration ; Николаев, Иван Борисович; Мучной, Николай Юрьевич.
In: Physical Review Letters, Vol. 132, No. 23, 231902, 04.06.2024, p. 231902.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - First Study of Antihyperon-Nucleon Scattering Λ¯p→Λ¯p and Measurement of Λp→Λp Cross Section
AU - BESIII Collaboration
AU - Ablikim, M.
AU - Achasov, M. n.
AU - Adlarson, P.
AU - Afedulidis, O.
AU - Ai, X. c.
AU - Aliberti, R.
AU - Amoroso, A.
AU - An, Q.
AU - Bai, Y.
AU - Bakina, O.
AU - Balossino, I.
AU - Ban, Y.
AU - Bao, H.-R.
AU - Batozskaya, V.
AU - Begzsuren, K.
AU - Berger, N.
AU - Berlowski, M.
AU - Bertani, M.
AU - Bettoni, D.
AU - Bianchi, F.
AU - Bianco, E.
AU - Bortone, A.
AU - Briere, R. a.
AU - Brueggemann, A.
AU - Cai, H.
AU - Cai, X.
AU - Николаев, Иван Борисович
AU - Мучной, Николай Юрьевич
PY - 2024/6/4
Y1 - 2024/6/4
N2 - Using (10.087±0.044)×109 J/ψ events collected with the BESIII detector at the BEPCII storage ring, the processes Λp→Λp and Λ¯p→Λ¯p are studied, where the Λ/Λ¯ baryons are produced in the process J/ψ→ΛΛ¯ and the protons are the hydrogen nuclei in the cooling oil of the beam pipe. Clear signals are observed for the two reactions. The cross sections in -0.9≤cosθΛ/Λ¯≤0.9 are measured to be σ(Λp→Λp)=(12.2±1.6stat±1.1syst) and σ(Λ¯p→Λ¯p)=(17.5±2.1stat±1.6syst) mb at the Λ/Λ¯ momentum of 1.074 GeV/c within a range of ±0.017 GeV/c, where the θΛ/Λ¯ are the scattering angles of the Λ/Λ¯ in the Λp/Λ¯p rest frames. Furthermore, the differential cross sections of the two reactions are also measured, where there is a slight tendency of forward scattering for Λp→Λp, and a strong forward peak for Λ¯p→Λ¯p. We present an approach to extract the total elastic cross sections by extrapolation. The study of Λ¯p→Λ¯p represents the first study of antihyperon-nucleon scattering, and these new measurements will serve as important inputs for the theoretical understanding of the (anti)hyperon-nucleon interaction.
AB - Using (10.087±0.044)×109 J/ψ events collected with the BESIII detector at the BEPCII storage ring, the processes Λp→Λp and Λ¯p→Λ¯p are studied, where the Λ/Λ¯ baryons are produced in the process J/ψ→ΛΛ¯ and the protons are the hydrogen nuclei in the cooling oil of the beam pipe. Clear signals are observed for the two reactions. The cross sections in -0.9≤cosθΛ/Λ¯≤0.9 are measured to be σ(Λp→Λp)=(12.2±1.6stat±1.1syst) and σ(Λ¯p→Λ¯p)=(17.5±2.1stat±1.6syst) mb at the Λ/Λ¯ momentum of 1.074 GeV/c within a range of ±0.017 GeV/c, where the θΛ/Λ¯ are the scattering angles of the Λ/Λ¯ in the Λp/Λ¯p rest frames. Furthermore, the differential cross sections of the two reactions are also measured, where there is a slight tendency of forward scattering for Λp→Λp, and a strong forward peak for Λ¯p→Λ¯p. We present an approach to extract the total elastic cross sections by extrapolation. The study of Λ¯p→Λ¯p represents the first study of antihyperon-nucleon scattering, and these new measurements will serve as important inputs for the theoretical understanding of the (anti)hyperon-nucleon interaction.
UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85196148480&origin=inward&txGid=03ce5afc433a77f467cb546038a075d5
UR - https://pubmed.ncbi.nlm.nih.gov/38905649/
U2 - 10.1103/PhysRevLett.132.231902
DO - 10.1103/PhysRevLett.132.231902
M3 - Article
C2 - 38905649
VL - 132
SP - 231902
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 23
M1 - 231902
ER -
ID: 62710079