Evidence for X (3872) →j/ψ π+ π-Produced in Single-Tag Two-Photon Interactions

Teramoto, Y. and Uehara, S. and Masuda, M. and Giri, Anjan Kumar et. al. (2021) Evidence for X (3872) →j/ψ π+ π-Produced in Single-Tag Two-Photon Interactions. Physical Review Letters, 126 (12). ISSN 0031-9007

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We report the first evidence for X(3872) production in two-photon interactions by tagging either the electron or the positron in the final state, exploring the highly virtual photon region. The search is performed in e+e-→e+e-J/ψ π+ π-, using 825 fb-1 of data collected by the Belle detector operated at the KEKB e+e-collider. We observe three X(3872) candidates, where the expected background is 0.11±0.10 events, with a significance of 3.2σ. We obtain an estimated value for γB(X(3872)→J/ψ π+ π-) assuming the Q2 dependence predicted by a cc meson model, where-Q2 is the invariant mass squared of the virtual photon. No X(3915)→J/ψ π+ π-candidates are found.

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IITH Creators:
IITH CreatorsORCiD
Giri, Anjan KumarUNSPECIFIED
Item Type: Article
Uncontrolled Keywords: Belle detectors; E+e- collider; Final state; Invariant mass; Two photon; Virtual photons
Subjects: Physics
Divisions: Department of Physics
Depositing User: . LibTrainee 2021
Date Deposited: 13 Jul 2021 10:50
Last Modified: 13 Jul 2021 10:50
URI: http://raiith.iith.ac.in/id/eprint/8292
Publisher URL:
OA policy: https://v2.sherpa.ac.uk/id/publication/13640
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