TY - JOUR
T1 - Improved measurement of the decays η′ →π+π-π+ (0)π- (0) and search for the rare decay η′ →4π0
AU - Ablikim, M.
AU - Achasov, M. N.
AU - Adlarson, P.
AU - Ai, X. C.
AU - Kabana, S.
AU - The BESIII collaboration
N1 - Publisher Copyright:
© 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3.
PY - 2024/2/1
Y1 - 2024/2/1
N2 - Using a sample of 10 billion J/ψ events collected with the BESIII detector, the decays η′→π+π-π+π-, η′→π+π-π0π0 and η′→4π0 are studied via the process J/ψ→γη′. The branching fractions of η′→π+π-π+π- and η′→π+π-π0 π0 are measured to be (8.56±0.25(stat)±0.23(syst))×10-5 and (2.12±0.12(stat)±0.10(syst))×10-4, respectively, which are consistent with previous measurements but with improved precision. No significant η′→4π0 signal is observed, and the upper limit on the branching fraction of this decay is determined to be less than 1.24×10-5 at the 90% confidence level. In addition, an amplitude analysis of η′→π+π-π+π- is performed to extract the doubly virtual isovector form factor α for the first time. The measured value of α=1.22±0.33(stat)±0.04(syst), is in agreement with the prediction of the vector meson dominance model.
AB - Using a sample of 10 billion J/ψ events collected with the BESIII detector, the decays η′→π+π-π+π-, η′→π+π-π0π0 and η′→4π0 are studied via the process J/ψ→γη′. The branching fractions of η′→π+π-π+π- and η′→π+π-π0 π0 are measured to be (8.56±0.25(stat)±0.23(syst))×10-5 and (2.12±0.12(stat)±0.10(syst))×10-4, respectively, which are consistent with previous measurements but with improved precision. No significant η′→4π0 signal is observed, and the upper limit on the branching fraction of this decay is determined to be less than 1.24×10-5 at the 90% confidence level. In addition, an amplitude analysis of η′→π+π-π+π- is performed to extract the doubly virtual isovector form factor α for the first time. The measured value of α=1.22±0.33(stat)±0.04(syst), is in agreement with the prediction of the vector meson dominance model.
UR - https://www.scopus.com/pages/publications/85185762745
U2 - 10.1103/PhysRevD.109.032006
DO - 10.1103/PhysRevD.109.032006
M3 - Article
AN - SCOPUS:85185762745
SN - 2470-0010
VL - 109
JO - Physical Review D
JF - Physical Review D
IS - 3
M1 - 032006
ER -