TY - JOUR

T1 - Precise Measurement of the χ c0 Resonance Parameters and Branching Fractions of χ c0,c2 → π + π - /K + K -

AU - BESIII Collaboration

AU - Ablikim, M.

AU - Ачасов, Михаил Николаевич

AU - Николаев, Иван Борисович

AU - Мучной, Николай Юрьевич

N1 - Precise Measurement of the χ c0 Resonance Parameters and Branching Fractions of χ c0,c2 → π + π - /K + K - / The BESIII Collaboration // Chinese Physics C. - 2025. - Т. 49. - С. 091001. DOI: 10.1088/1674-1137/ade95f

PY - 2025

Y1 - 2025

N2 - By analyzing a Ψ(3686) data sample containing (107.7±0.6)×10 6 events taken with the BESIII detector at the BEPCII storage ring in 2009, the χ c0 resonance parameters are precisely measured using χ c0,c2 → π + π - /K + K - events. The mass of χ c0 is determined to be M(χ c0 )=(3415.63±0.07±0.07±0.07)MeV/c 2 , and its full width is Γ( χ c0 )=(12.52±0.12±0.13) MeV, where the first uncertainty is statistical, the second systematic, and the third for mass comes from χ c2 mass uncertainty. These measurements improve the precision of χ c0 mass by a factor of four and width by one order of magnitude over the previous individual measurements, and significantly boost our knowledge about the charmonium spectrum. Together with additional (345.4±2.6)×10 6 Ψ(3686) data events taken in 2012, the decay branching fractions of χ c0,c2 → π + π - /K + K - are measured as well, with precision improved by a factor of three compared to previous measurements. These χ c0 decay branching fractions provide important inputs for the study of glueballs. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

AB - By analyzing a Ψ(3686) data sample containing (107.7±0.6)×10 6 events taken with the BESIII detector at the BEPCII storage ring in 2009, the χ c0 resonance parameters are precisely measured using χ c0,c2 → π + π - /K + K - events. The mass of χ c0 is determined to be M(χ c0 )=(3415.63±0.07±0.07±0.07)MeV/c 2 , and its full width is Γ( χ c0 )=(12.52±0.12±0.13) MeV, where the first uncertainty is statistical, the second systematic, and the third for mass comes from χ c2 mass uncertainty. These measurements improve the precision of χ c0 mass by a factor of four and width by one order of magnitude over the previous individual measurements, and significantly boost our knowledge about the charmonium spectrum. Together with additional (345.4±2.6)×10 6 Ψ(3686) data events taken in 2012, the decay branching fractions of χ c0,c2 → π + π - /K + K - are measured as well, with precision improved by a factor of three compared to previous measurements. These χ c0 decay branching fractions provide important inputs for the study of glueballs. Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. Article funded by SCOAP3 and published under licence by Chinese Physical Society and the Institute of High Energy Physics of the Chinese Academy of Science and the Institute of Modern Physics of the Chinese Academy of Sciences and IOP Publishing Ltd.

UR - https://www.mendeley.com/catalogue/5a661da0-723c-3ae6-b82e-45eebe9aa69b/

U2 - 10.1088/1674-1137/ade95f

DO - 10.1088/1674-1137/ade95f

M3 - Article

VL - 49

JO - Chinese Physics C

JF - Chinese Physics C

SN - 1674-1137

M1 - 091001

ER -