First study of antihyperon-nucleon scattering
Λ̅p→Λ̅p and measurement of Λ
p→Λ p cross section
BESIII Collaboration,M. Ablikim,M. N. Achasov,P. Adlarson,O. Afedulidis,X. C. Ai,R. Aliberti,A. Amoroso,Q. An,Y. Bai,O. Bakina,I. Balossino,Y. Ban,H. -R. Bao,V. Batozskaya,K. Begzsuren,N. Berger,M. Berlowski,M. Bertani,D. Bettoni,F. Bianchi,E. Bianco,A. Bortone,I. Boyko,R. A. Briere,A. Brueggemann,H. Cai,X. Cai,A. Calcaterra,G. F. Cao,N. Cao,S. A. Cetin,J. F. Chang,G. R. Che,G. Chelkov,C. Chen,C. H. Chen,Chao Chen,G. Chen,H. S. Chen,H. Y. Chen,M. L. Chen,S. J. Chen,S. L. Chen,S. M. Chen,T. Chen,X. R. Chen,X. T. Chen,Y. B. Chen,Y. Q. Chen,Z. J. Chen,Z. Y. Chen,S. K. Choi,G. Cibinetto,F. Cossio,J. J. Cui,H. L. Dai,J. P. Dai,A. Dbeyssi,R. E. de Boer,D. Dedovich,C. Q. Deng,Z. Y. Deng,A. Denig,I. Denysenko,M. Destefanis,F. De Mori,B. Ding,X. X. Ding,Y. Ding,Y. Ding,J. Dong,L. Y. Dong,M. Y. Dong,X. Dong,M. C. Du,S. X. Du,Z. H. Duan,P. Egorov,Y. H. Fan,J. Fang,J. Fang,S. S. Fang,W. X. Fang,Y. Fang,Y. Q. Fang,R. Farinelli,L. Fava,F. Feldbauer,G. Felici,C. Q. Feng,J. H. Feng,Y. T. Feng,M. 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arxiv(2024)
Cited0|Views26
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Abstract
Using (10.087±0.044)×10^9 J/ψ events collected with the
BESIII detector at the BEPCII storage ring, the processes Λ
p→Λ p and Λ̅p→Λ̅p are
studied, where the Λ/Λ̅ baryons are produced in the process
J/ψ→ΛΛ̅ 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≤cosθ_Λ/Λ̅≤0.9 are measured to be
σ(Λ p→Λ
p)=(12.2±1.6_stat±1.1_sys) mb and σ(Λ̅
p→Λ̅ p)=(17.5±2.1_stat±1.6_sys) mb at
the Λ/Λ̅ momentum of 1.074 GeV/c within a range of
±0.017 GeV/c, where the θ_Λ/Λ̅ are the
scattering angles of the Λ/Λ̅ in the Λ
p/Λ̅p rest frames. Furthermore, the differential cross sections of
the two reactions are also measured, where there is a slight tendency of
forward scattering for Λ p→Λ p, and a strong forward
peak for Λ̅p→Λ̅p. We present an approach to
extract the total cross sections by extrapolation. The study of
Λ̅p→Λ̅p 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.
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