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Observation of ηc(2S)→K+K−η. / BESIII Collaboration ; Николаев, Иван Борисович; Мучной, Николай Юрьевич.

In: Physical Review D, Vol. 110, No. 9, 92003, 12.11.2024.

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BESIII Collaboration, Николаев ИБ, Мучной НЮ. Observation of ηc(2S)→K+K−η. Physical Review D. 2024 Nov 12;110(9):92003. doi: 10.1103/PhysRevD.110.092003

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@article{6442d2fe39b9452e92a008ba9814db59,
title = "Observation of ηc(2S)→K+K−η",
abstract = "By analyzing (27.12±0.14)×108 ψ(3686) events accumulated with the BESIII detector, the decay ηc(2S)→K+K−η is observed for the first time with a significance of 6.2σ after considering systematic uncertainties. The product of the branching fractions of ψ(3686)→γηc(2S) and ηc(2S)→K+K−η is measured to be B(ψ(3686)→γηc(2S))×B(ηc(2S)→K+K−η)=(2.39±0.32±0.34)×10−6, where the first uncertainty is statistical, and the second one is systematic. The branching fraction of ηc(2S)→K+K−η is determined to be B(ηc(2S)→K+K−η)=(3.42±0.46±0.48±2.44)×10−3, where the third uncertainty is due to the branching fraction ofψ(3686)→γηc(2S). Using a recent BESIII measurement of B(ηc(2S)→K+K−π0), we also determine the ratio between the branching fractions of ηc(2S)→K+K−η and ηc(2S)→K+K−π0 to be1.49±0.22±0.25, which is consistent with the previous result of BABAR at a comparable precision level.",
author = "{BESIII Collaboration} and M. Ablikim and M. n. Achasov and Николаев, {Иван Борисович} and Мучной, {Николай Юрьевич}",
year = "2024",
month = nov,
day = "12",
doi = "10.1103/PhysRevD.110.092003",
language = "English",
volume = "110",
journal = "Physical Review D",
issn = "2470-0010",
publisher = "American Physical Society",
number = "9",

}

RIS

TY - JOUR

T1 - Observation of ηc(2S)→K+K−η

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. n.

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

PY - 2024/11/12

Y1 - 2024/11/12

N2 - By analyzing (27.12±0.14)×108 ψ(3686) events accumulated with the BESIII detector, the decay ηc(2S)→K+K−η is observed for the first time with a significance of 6.2σ after considering systematic uncertainties. The product of the branching fractions of ψ(3686)→γηc(2S) and ηc(2S)→K+K−η is measured to be B(ψ(3686)→γηc(2S))×B(ηc(2S)→K+K−η)=(2.39±0.32±0.34)×10−6, where the first uncertainty is statistical, and the second one is systematic. The branching fraction of ηc(2S)→K+K−η is determined to be B(ηc(2S)→K+K−η)=(3.42±0.46±0.48±2.44)×10−3, where the third uncertainty is due to the branching fraction ofψ(3686)→γηc(2S). Using a recent BESIII measurement of B(ηc(2S)→K+K−π0), we also determine the ratio between the branching fractions of ηc(2S)→K+K−η and ηc(2S)→K+K−π0 to be1.49±0.22±0.25, which is consistent with the previous result of BABAR at a comparable precision level.

AB - By analyzing (27.12±0.14)×108 ψ(3686) events accumulated with the BESIII detector, the decay ηc(2S)→K+K−η is observed for the first time with a significance of 6.2σ after considering systematic uncertainties. The product of the branching fractions of ψ(3686)→γηc(2S) and ηc(2S)→K+K−η is measured to be B(ψ(3686)→γηc(2S))×B(ηc(2S)→K+K−η)=(2.39±0.32±0.34)×10−6, where the first uncertainty is statistical, and the second one is systematic. The branching fraction of ηc(2S)→K+K−η is determined to be B(ηc(2S)→K+K−η)=(3.42±0.46±0.48±2.44)×10−3, where the third uncertainty is due to the branching fraction ofψ(3686)→γηc(2S). Using a recent BESIII measurement of B(ηc(2S)→K+K−π0), we also determine the ratio between the branching fractions of ηc(2S)→K+K−η and ηc(2S)→K+K−π0 to be1.49±0.22±0.25, which is consistent with the previous result of BABAR at a comparable precision level.

U2 - 10.1103/PhysRevD.110.092003

DO - 10.1103/PhysRevD.110.092003

M3 - Article

VL - 110

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 9

M1 - 92003

ER -

ID: 67753441