Observation of the electromagnetic Dalitz transition hc →e+e-ηc

BESIII Collaboration; M. Ablikim; M.N. Achasov; P. Adlarson; R. Aliberti; X.C. Ai; A. Amoroso; O.   Bakina; Nasser Kalantar-Nayestanaki; Rosa Kappert; Myroslav Kavatsyuk; Johan Messchendorp; Viktor Rodin

doi:10.1103/PhysRevD.110.L111101

Observation of the electromagnetic Dalitz transition hc →e+e-ηc

BESIII Collaboration, M. Ablikim^*, M.N. Achasov, P. Adlarson, R. Aliberti, X.C. Ai, A. Amoroso, O. Bakina, Nasser Kalantar-Nayestanaki, Rosa Kappert, Myroslav Kavatsyuk, Johan Messchendorp, Viktor Rodin

^*Corresponding author for this work

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Abstract

Using (27.12±0.14)×108 ψ(3686) decays and data samples of e+e- collisions with s from 4.130 to 4.780 GeV collected with the BESIII detector, we report the first observation of the electromagnetic Dalitz transition hc→e+e-ηc with a statistical significance of 5.4σ. We measure the ratio of the branching fractions B(hc→e+e-ηc)B(hc→γηc) separately for the hc samples produced via ψ(3686)→π0hc and e+e-→π+π-hc. The average ratio is determined to be (0.59±0.10(stat)±0.04(syst))%, where the uncertainty includes both statistical and systematic components.

Original language	English
Article number	L111101
Number of pages	8
Journal	Physical Review D
Volume	110
Issue number	11
DOIs	https://doi.org/10.1103/PhysRevD.110.L111101
Publication status	Published - Dec-2024

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title = "Observation of the electromagnetic Dalitz transition hc →e+e-ηc",

abstract = "Using (27.12±0.14)×108 ψ(3686) decays and data samples of e+e- collisions with s from 4.130 to 4.780 GeV collected with the BESIII detector, we report the first observation of the electromagnetic Dalitz transition hc→e+e-ηc with a statistical significance of 5.4σ. We measure the ratio of the branching fractions B(hc→e+e-ηc)B(hc→γηc) separately for the hc samples produced via ψ(3686)→π0hc and e+e-→π+π-hc. The average ratio is determined to be (0.59±0.10(stat)±0.04(syst))%, where the uncertainty includes both statistical and systematic components. ",

author = "{BESIII Collaboration} and M. Ablikim and M.N. Achasov and P. Adlarson and R. Aliberti and X.C. Ai and A. Amoroso and O. Bakina and Nasser Kalantar-Nayestanaki and Rosa Kappert and Myroslav Kavatsyuk and Johan Messchendorp and Viktor Rodin",

year = "2024",

month = dec,

doi = "10.1103/PhysRevD.110.L111101",

language = "English",

volume = "110",

journal = "Physical Review D",

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TY - JOUR

T1 - Observation of the electromagnetic Dalitz transition hc →e+e-ηc

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M.N.

AU - Adlarson, P.

AU - Aliberti, R.

AU - Ai, X.C.

AU - Amoroso, A.

AU - Bakina, O.

AU - Kalantar-Nayestanaki, Nasser

AU - Kappert, Rosa

AU - Kavatsyuk, Myroslav

AU - Messchendorp, Johan

AU - Rodin, Viktor

PY - 2024/12

Y1 - 2024/12

N2 - Using (27.12±0.14)×108 ψ(3686) decays and data samples of e+e- collisions with s from 4.130 to 4.780 GeV collected with the BESIII detector, we report the first observation of the electromagnetic Dalitz transition hc→e+e-ηc with a statistical significance of 5.4σ. We measure the ratio of the branching fractions B(hc→e+e-ηc)B(hc→γηc) separately for the hc samples produced via ψ(3686)→π0hc and e+e-→π+π-hc. The average ratio is determined to be (0.59±0.10(stat)±0.04(syst))%, where the uncertainty includes both statistical and systematic components.

AB - Using (27.12±0.14)×108 ψ(3686) decays and data samples of e+e- collisions with s from 4.130 to 4.780 GeV collected with the BESIII detector, we report the first observation of the electromagnetic Dalitz transition hc→e+e-ηc with a statistical significance of 5.4σ. We measure the ratio of the branching fractions B(hc→e+e-ηc)B(hc→γηc) separately for the hc samples produced via ψ(3686)→π0hc and e+e-→π+π-hc. The average ratio is determined to be (0.59±0.10(stat)±0.04(syst))%, where the uncertainty includes both statistical and systematic components.

U2 - 10.1103/PhysRevD.110.L111101

DO - 10.1103/PhysRevD.110.L111101

M3 - Article

SN - 1550-7998

VL - 110

JO - Physical Review D

JF - Physical Review D

IS - 11

M1 - L111101

ER -

Observation of the electromagnetic Dalitz transition hc →e+e-ηc

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