https://scholars.lib.ntu.edu.tw/handle/123456789/606624
標題: | Evidence for X (3872) →j/ψ π+ π-Produced in Single-Tag Two-Photon Interactions | 作者: | PAO-TI CHANG WEI-SHU HOU |
關鍵字: | Atomic physics; Physics; Belle detectors; E+e- collider; Final state; Invariant mass; Two photon; Virtual photons; Photons; article; meson; photon; positron | 公開日期: | 2021 | 卷: | 126 | 期: | 12 | 來源出版物: | Physical Review Letters | 摘要: | 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. ? 2021 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3. |
URI: | https://www.scopus.com/inward/record.uri?eid=2-s2.0-85103505018&doi=10.1103%2fPhysRevLett.126.122001&partnerID=40&md5=7521cf2aaee8f866ac10b2f07a504f14 https://scholars.lib.ntu.edu.tw/handle/123456789/606624 |
ISSN: | 319007 | DOI: | 10.1103/PhysRevLett.126.122001 |
顯示於: | 物理學系 |
在 IR 系統中的文件,除了特別指名其著作權條款之外,均受到著作權保護,並且保留所有的權利。