Investigation of the ΔI=1/2 Rule and Test of CP Symmetry through the Measurement of Decay Asymmetry Parameters in Ξ^{-} Decays

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Investigation of the ΔI=1/2 Rule and Test of CP Symmetry through the Measurement of Decay Asymmetry Parameters in Ξ^{-} Decays. / BESIII Collaboration ; Николаев, Иван Борисович ; Мучной, Николай Юрьевич.

In: Physical Review Letters, Vol. 132, No. 10, 101801, 05.03.2024, p. 101801.

Research output: Contribution to journal › Article › peer-review

BibTeX

@article{dad6169335c8419faab5579810c372c1,

title = "Investigation of the ΔI=1/2 Rule and Test of CP Symmetry through the Measurement of Decay Asymmetry Parameters in Ξ^{-} Decays",

abstract = "Using (10087±44)×10^{6} J/ψ events collected with the BESIII detector, numerous Ξ^{-} and Λ decay asymmetry parameters are simultaneously determined from the process J/ψ→Ξ^{-}Ξ[over ¯]^{+}→Λ(pπ^{-})π^{-}Λ[over ¯](n[over ¯]π^{0})π^{+} and its charge-conjugate channel. The precisions of α_{Λ0} for Λ→nπ^{0} and α[over ¯]_{Λ0} for Λ[over ¯]→n[over ¯]π^{0} compared to world averages are improved by factors of 4 and 1.7, respectively. The ratio of decay asymmetry parameters of Λ→nπ^{0} to that of Λ→pπ^{-}, ⟨α_{Λ0}⟩/⟨α_{Λ-}⟩, is determined to be 0.873±0.012_{-0.010}^{+0.011}, where the first and the second uncertainties are statistical and systematic, respectively. The ratio is smaller than unity more than 5σ, which signifies the existence of the ΔI=3/2 transition in Λ for the first time. Besides, we test for CP symmetry in Ξ^{-}→Λπ^{-} and in Λ→nπ^{0} with the best precision to date.",

author = "{BESIII Collaboration} and M. Ablikim and M. n. Achasov and P. Adlarson and X. c. Ai and R. Aliberti and A. Amoroso and M. r. An and Q. An and Y. Bai and O. Bakina and I. Balossino and Y. Ban and V. Batozskaya and K. Begzsuren and N. Berger and M. Berlowski and M. Bertani and D. Bettoni and F. Bianchi and E. Bianco and A. Bortone and R. a. Briere and A. Brueggemann and H. Cai and X. Cai and A. Calcaterra and G. f. Cao and N. Cao and Николаев, {Иван Борисович} and Мучной, {Николай Юрьевич}",

year = "2024",

month = mar,

day = "5",

doi = "10.1103/PhysRevLett.132.101801",

language = "English",

volume = "132",

pages = "101801",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "10",

}

RIS

TY - JOUR

T1 - Investigation of the ΔI=1/2 Rule and Test of CP Symmetry through the Measurement of Decay Asymmetry Parameters in Ξ^{-} Decays

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Adlarson, P.

AU - Ai, X. c.

AU - Aliberti, R.

AU - Amoroso, A.

AU - An, M. r.

AU - An, Q.

AU - Bai, Y.

AU - Bakina, O.

AU - Balossino, I.

AU - Ban, Y.

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 - Calcaterra, A.

AU - Cao, G. f.

AU - Cao, N.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/3/5

Y1 - 2024/3/5

N2 - Using (10087±44)×10^{6} J/ψ events collected with the BESIII detector, numerous Ξ^{-} and Λ decay asymmetry parameters are simultaneously determined from the process J/ψ→Ξ^{-}Ξ[over ¯]^{+}→Λ(pπ^{-})π^{-}Λ[over ¯](n[over ¯]π^{0})π^{+} and its charge-conjugate channel. The precisions of α_{Λ0} for Λ→nπ^{0} and α[over ¯]_{Λ0} for Λ[over ¯]→n[over ¯]π^{0} compared to world averages are improved by factors of 4 and 1.7, respectively. The ratio of decay asymmetry parameters of Λ→nπ^{0} to that of Λ→pπ^{-}, ⟨α_{Λ0}⟩/⟨α_{Λ-}⟩, is determined to be 0.873±0.012_{-0.010}^{+0.011}, where the first and the second uncertainties are statistical and systematic, respectively. The ratio is smaller than unity more than 5σ, which signifies the existence of the ΔI=3/2 transition in Λ for the first time. Besides, we test for CP symmetry in Ξ^{-}→Λπ^{-} and in Λ→nπ^{0} with the best precision to date.

AB - Using (10087±44)×10^{6} J/ψ events collected with the BESIII detector, numerous Ξ^{-} and Λ decay asymmetry parameters are simultaneously determined from the process J/ψ→Ξ^{-}Ξ[over ¯]^{+}→Λ(pπ^{-})π^{-}Λ[over ¯](n[over ¯]π^{0})π^{+} and its charge-conjugate channel. The precisions of α_{Λ0} for Λ→nπ^{0} and α[over ¯]_{Λ0} for Λ[over ¯]→n[over ¯]π^{0} compared to world averages are improved by factors of 4 and 1.7, respectively. The ratio of decay asymmetry parameters of Λ→nπ^{0} to that of Λ→pπ^{-}, ⟨α_{Λ0}⟩/⟨α_{Λ-}⟩, is determined to be 0.873±0.012_{-0.010}^{+0.011}, where the first and the second uncertainties are statistical and systematic, respectively. The ratio is smaller than unity more than 5σ, which signifies the existence of the ΔI=3/2 transition in Λ for the first time. Besides, we test for CP symmetry in Ξ^{-}→Λπ^{-} and in Λ→nπ^{0} with the best precision to date.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85187192701&origin=inward&txGid=0128f93ff892191e435a360ae0f7d461

UR - https://pubmed.ncbi.nlm.nih.gov/38518329/

UR - https://www.mendeley.com/catalogue/1078cdce-7ffb-3b14-bb0a-2cf75cc14c5e/

U2 - 10.1103/PhysRevLett.132.101801

DO - 10.1103/PhysRevLett.132.101801

M3 - Article

C2 - 38518329

VL - 132

SP - 101801

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 10

M1 - 101801

ER -

ID: 62717064