Measurement of the branching fraction of ψ(2S)→γπ0

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Measurement of the branching fraction of ψ(2S)→γπ0. / BESIII Collaboration ; Николаев, Иван Борисович ; Ачасов, Михаил Николаевич et al.

In: Physical Review D, Vol. 110, No. 5, 052011, 27.09.2024.

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

BibTeX

@article{883d208a82af40c1b31241762ae06b10,

title = "Measurement of the branching fraction of ψ(2S)→γπ0",

abstract = "Based on (2712.4±14.1)×106 ψ(2S) events, 7.9 fb-1 ψ(3773) data, and 0.8 fb-1 off-resonance data samples collected with the BESIII detector, we measure the branching fraction of ψ(2S)→γπ0 and e+e-→γπ0 form factor at momentum transfers Q2∼13 GeV2. The e+e-→γπ0 cross section is fitted with considering the interference between the ψ(2S) and continuum amplitudes and two solutions are found, B=3.74×10-7 with φ=3.93 rad and B=7.87×10-7 with φ=2.08 rad. Here, B is the branching fraction of ψ(2S)→γπ0 and φ is the relative phase angle between the ψ(2S) and continuum amplitudes. Due to insufficient off-resonance data, the branching fraction B(ψ(2S)→γπ0) is determined to be in the range [2.7,9.7]×10-7 within 1 standard deviation of the contour region. ",

author = "{BESIII Collaboration} and M. Ablikim and P. Adlarson and O. Afedulidis and X. c. Ai and R. Aliberti and A. Amoroso and Q. An and Y. Bai and O. Bakina and I. Balossino and Y. Ban and H.-R. Bao 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 Николаев, {Иван Борисович} and Ачасов, {Михаил Николаевич} and Мучной, {Николай Юрьевич}",

year = "2024",

month = sep,

day = "27",

doi = "10.1103/PhysRevD.110.052011",

language = "English",

volume = "110",

journal = "Physical Review D",

issn = "2470-0010",

publisher = "American Physical Society",

number = "5",

}

RIS

TY - JOUR

T1 - Measurement of the branching fraction of ψ(2S)→γπ0

AU - BESIII Collaboration

AU - Ablikim, M.

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 - Николаев, Иван Борисович

AU - Ачасов, Михаил Николаевич

AU - Мучной, Николай Юрьевич

PY - 2024/9/27

Y1 - 2024/9/27

N2 - Based on (2712.4±14.1)×106 ψ(2S) events, 7.9 fb-1 ψ(3773) data, and 0.8 fb-1 off-resonance data samples collected with the BESIII detector, we measure the branching fraction of ψ(2S)→γπ0 and e+e-→γπ0 form factor at momentum transfers Q2∼13 GeV2. The e+e-→γπ0 cross section is fitted with considering the interference between the ψ(2S) and continuum amplitudes and two solutions are found, B=3.74×10-7 with φ=3.93 rad and B=7.87×10-7 with φ=2.08 rad. Here, B is the branching fraction of ψ(2S)→γπ0 and φ is the relative phase angle between the ψ(2S) and continuum amplitudes. Due to insufficient off-resonance data, the branching fraction B(ψ(2S)→γπ0) is determined to be in the range [2.7,9.7]×10-7 within 1 standard deviation of the contour region.

AB - Based on (2712.4±14.1)×106 ψ(2S) events, 7.9 fb-1 ψ(3773) data, and 0.8 fb-1 off-resonance data samples collected with the BESIII detector, we measure the branching fraction of ψ(2S)→γπ0 and e+e-→γπ0 form factor at momentum transfers Q2∼13 GeV2. The e+e-→γπ0 cross section is fitted with considering the interference between the ψ(2S) and continuum amplitudes and two solutions are found, B=3.74×10-7 with φ=3.93 rad and B=7.87×10-7 with φ=2.08 rad. Here, B is the branching fraction of ψ(2S)→γπ0 and φ is the relative phase angle between the ψ(2S) and continuum amplitudes. Due to insufficient off-resonance data, the branching fraction B(ψ(2S)→γπ0) is determined to be in the range [2.7,9.7]×10-7 within 1 standard deviation of the contour region.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85208487108&origin=inward&txGid=9c3aa7f872817825f81cf8276b2fc00b

U2 - 10.1103/PhysRevD.110.052011

DO - 10.1103/PhysRevD.110.052011

M3 - Article

VL - 110

JO - Physical Review D

JF - Physical Review D

SN - 2470-0010

IS - 5

M1 - 052011

ER -

ID: 62704134