Coupled-Channel Analysis of the χ c 1 ( 3872 ) Line Shape with BESIII Data

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doi:10.1103/PhysRevLett.132.151903

Coupled-Channel Analysis of the $χ_{c 1} (3872)$ Line Shape with BESIII Data

Journal Article · Fri Apr 12 00:00:00 EDT 2024 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.132.151903· OSTI ID:2336798

Ablikim, M.; Achasov, M. N.; Adlarson, P.; Ai, X. C.; Aliberti, R.; Amoroso, A.; An, M. R.; An, Q.; Bai, Y.; Bakina, O.; Balossino, I.; Ban, Y.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F.; Bianco, E. more »

We perform a study of the $χ_{c 1} (3872)$ line shape using the data samples of $e^{+} e^{-} \to γ χ_{c 1} (3872)$ , $χ_{c 1} (3872) \to D^{0} {\bar{D}}^{0} π^{0}$ , and $π^{+} π^{-} J / ψ$ collected with the BESIII detector. The effects of the coupled channels and the off-shell $D^{* 0}$ are included in the parametrization of the line shape. The line shape mass parameter is obtained to be $M_{X} = (3871.63 \pm 0.1 3_{- 0.05}^{+ 0.06}) MeV$ . Two poles are found on the first and second Riemann sheets corresponding to the $D^{* 0} {\bar{D}}^{0}$ branch cut. The pole location on the first sheet is much closer to the $D^{* 0} {\bar{D}}^{0}$ threshold than the other, and is determined to be $7.04 \pm 0.1 5_{- 0.08}^{+ 0.07} MeV$ above the $D^{0} {\bar{D}}^{0} π^{0}$ threshold with an imaginary part $- 0.19 \pm 0.0 8_{- 0.19}^{+ 0.14} MeV$ .

Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2336798

Alternate ID(s):: OSTI ID: 2579687

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 132; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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