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Evidence for the Cusp Effect in η′ Decays into ηπ0π0. / BESIII Collaboration ; Мучной, Николай Юрьевич.

In: Physical Review Letters, Vol. 130, No. 8, 081901, 24.06.2023.

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

Harvard

BESIII Collaboration & Мучной, НЮ 2023, 'Evidence for the Cusp Effect in η′ Decays into ηπ0π0', Physical Review Letters, vol. 130, no. 8, 081901. https://doi.org/10.1103/PhysRevLett.130.081901

APA

BESIII Collaboration, & Мучной, Н. Ю. (2023). Evidence for the Cusp Effect in η′ Decays into ηπ0π0. Physical Review Letters, 130(8), [081901]. https://doi.org/10.1103/PhysRevLett.130.081901

Vancouver

BESIII Collaboration, Мучной НЮ. Evidence for the Cusp Effect in η′ Decays into ηπ0π0. Physical Review Letters. 2023 Jun 24;130(8):081901. doi: 10.1103/PhysRevLett.130.081901

Author

BESIII Collaboration ; Мучной, Николай Юрьевич. / Evidence for the Cusp Effect in η′ Decays into ηπ0π0. In: Physical Review Letters. 2023 ; Vol. 130, No. 8.

BibTeX

@article{2972233a5cf44748b5afd805d51830c4,
title = "Evidence for the Cusp Effect in η′ Decays into ηπ0π0",
abstract = "Using a sample of 4.3×105 η′→ηπ0π0 events selected from the ten billion J/ψ event dataset collected with the BESIII detector, we study the decay η′→ηπ0π0 within the framework of nonrelativistic effective field theory. Evidence for a structure at π+π- mass threshold is observed in the invariant mass spectrum of π0π0 with a statistical significance of around 3.5σ, which is consistent with the cusp effect as predicted by the nonrelativistic effective field theory. After introducing the amplitude for describing the cusp effect, the ππ scattering length combination a0-a2 is determined to be 0.226±0.060stat±0.013syst, which is in good agreement with theoretical calculation of 0.2644±0.0051.",
author = "{BESIII Collaboration} and M. Ablikim and Achasov, {M. N.} and Nikolaev, {I. B.} and Мучной, {Николай Юрьевич}",
year = "2023",
month = jun,
day = "24",
doi = "10.1103/PhysRevLett.130.081901",
language = "English",
volume = "130",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "8",

}

RIS

TY - JOUR

T1 - Evidence for the Cusp Effect in η′ Decays into ηπ0π0

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Achasov, M. N.

AU - Nikolaev, I. B.

AU - Мучной, Николай Юрьевич

PY - 2023/6/24

Y1 - 2023/6/24

N2 - Using a sample of 4.3×105 η′→ηπ0π0 events selected from the ten billion J/ψ event dataset collected with the BESIII detector, we study the decay η′→ηπ0π0 within the framework of nonrelativistic effective field theory. Evidence for a structure at π+π- mass threshold is observed in the invariant mass spectrum of π0π0 with a statistical significance of around 3.5σ, which is consistent with the cusp effect as predicted by the nonrelativistic effective field theory. After introducing the amplitude for describing the cusp effect, the ππ scattering length combination a0-a2 is determined to be 0.226±0.060stat±0.013syst, which is in good agreement with theoretical calculation of 0.2644±0.0051.

AB - Using a sample of 4.3×105 η′→ηπ0π0 events selected from the ten billion J/ψ event dataset collected with the BESIII detector, we study the decay η′→ηπ0π0 within the framework of nonrelativistic effective field theory. Evidence for a structure at π+π- mass threshold is observed in the invariant mass spectrum of π0π0 with a statistical significance of around 3.5σ, which is consistent with the cusp effect as predicted by the nonrelativistic effective field theory. After introducing the amplitude for describing the cusp effect, the ππ scattering length combination a0-a2 is determined to be 0.226±0.060stat±0.013syst, which is in good agreement with theoretical calculation of 0.2644±0.0051.

UR - https://www.mendeley.com/catalogue/40dd8683-2083-3a65-8d25-ff357194234f/

UR - https://pubmed.ncbi.nlm.nih.gov/36898113/#full-view-affiliation-1

U2 - 10.1103/PhysRevLett.130.081901

DO - 10.1103/PhysRevLett.130.081901

M3 - Article

C2 - 36898113

VL - 130

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 8

M1 - 081901

ER -

ID: 71476929