Evidence for X(3872) -> J/Psi pi(+)pi(-) Produced in Single-Tag Two-Photon Interactions

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10439867" target="_blank" >RIV/00216208:11320/21:10439867 - isvavai.cz</a>
Result on the web
<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=voFoHWbFae" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=voFoHWbFae</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1103/PhysRevLett.126.122001" target="_blank" >10.1103/PhysRevLett.126.122001</a>

Result language
angličtina
Original language name
Evidence for X(3872) -> J/Psi pi(+)pi(-) Produced in Single-Tag Two-Photon Interactions
Original language description
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/Psi pi(+)pi(-), 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 3.2 sigma. We obtain an estimated value for (Gamma) over tilde (gamma gamma) B(x(3872) -> j/Psi pi(+)pi(-)) assuming the Q(2) dependence predicted by a c (c) over bar meson model, where -Q(2) is the invariant mass squared of the virtual photon. No X(3915) -> J/Psi pi(+)pi(-) candidates are found.
Czech name
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Czech description
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Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10300 - Physical sciences

Project
<a href="/en/project/LTT17020" target="_blank" >LTT17020: Study of Beyond Standard Model Physics with the International Experiment Belle II in Japan</a><br>
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2021
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

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