Search for the decay χ c 1 ( 3872 ) → π + π − χ c 1

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doi:10.1103/PhysRevD.109.L071101

Title: Search for the decay $χ_{c 1} (3872) \to π^{+} π^{-} χ_{c 1}$

Journal Article · 08 April 2024 · Physical Review. D.

DOI: https://doi.org/10.1103/PhysRevD.109.L071101 · OSTI ID:2335517

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.; Bao, H. -R.; Batozskaya, V.; Begzsuren, K.; Berger, N.; Berlowski, M.; Bertani, M.; Bettoni, D.; Bianchi, F. more »

Using a data sample corresponding to an integrated luminosity of $10.9 {fb}^{- 1}$ collected at center-of-mass energies from 4.16 to 4.34 GeV with the BESIII detector, we search for the decay $χ_{c 1} (3872) \to π^{+} π^{-} χ_{c 1}$ in the radiative production $e^{+} e^{-} \to γ χ_{c 1} (3872)$ . No significant signal is observed, and the ratio for the branching fraction of $χ_{c 1} (3872) \to π^{+} π^{-} χ_{c 1}$ to $χ_{c 1} (3872) \to π^{+} π^{-} J / ψ$ is measured as $R \equiv \frac{B [χ_{c 1} (3872) \to π^{+} π^{-} χ_{c 1}]}{B [χ_{c 1} (3872) \to π^{+} π^{-} J / ψ]} < 0.18$ at 90% confidence level. An upper limit on the product of the cross section $σ [e^{+} e^{-} \to γ χ_{c 1} (3872)]$ and the branching fraction $B [χ_{c 1} (3872) \to π^{+} π^{-} χ_{c 1}]$ at each center-of-mass energy is also given. These measurements favor the nonconventional charmonium nature of the $χ_{c 1} (3872)$ state. Published by the American Physical Society 2024

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Sponsoring Organization:: USDOE

Grant/Contract Number:: FG02-05ER41374

OSTI ID:: 2335517

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 7 Vol. 109; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Bayesian versus frequentist upper limits Prix, Reinhard; Messenger, Chris; Röver, Christian CERN https://doi.org/10.5170/CERN-2011-006.158	null	January 2011

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