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Observation of the Decay X(3872) -> pi(0)chi(c1) (1P)
Inst High Energy Phys, Beijing 100049, Peoples R China.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0002-6945-716x
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.ORCID iD: 0000-0003-4937-2270
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Number of Authors: 4702019 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 122, no 20, article id 202001Article in journal (Refereed) Published
Abstract [en]

Using a total of 9.0 fb(-1) of e(+)e(-) collision data with center-of-mass energies between 4.15 and 4.30 GeV collected by the BESIII detector, we search for the processes e(+)e(-) gamma X(3872) with X(3872) -> pi(0)chi(cJ) for J = 0, 1, 2. We report the first observation of X(3872) -> pi(0)chi(c1), a new decay mode of the X(3872), with a statistical significance of more than 5 sigma for all systematic fit variations. Normalizing to the previously established process e(+)e(-) -> gamma X(3872) with X(3872) -> pi(+) pi(-) J/psi, we find B(X(3872) -> pi(0)chi(c1))/B(X(3872) -> pi+ pi(-) J/psi) = 0.88(-0.27)(+0.33) +/- 0.10, where the first error is statistical and the second is systematic. We set 90% confidence level upper limits on the corresponding ratios for the decays to pi(0)chi(c0) and pi(0)chi(c2) of 19 and 1.1, respectively.

Place, publisher, year, edition, pages
2019. Vol. 122, no 20, article id 202001
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-387588DOI: 10.1103/PhysRevLett.122.202001ISI: 000469035500004PubMedID: 31172749OAI: oai:DiVA.org:uu-387588DiVA, id: diva2:1331326
Funder
Swedish Research CouncilKnut and Alice Wallenberg Foundation
Note

For complete list of authors see http://dx.doi.org/10.1103/PhysRevLett.122.202001

Available from: 2019-06-26 Created: 2019-06-26 Last updated: 2019-06-26Bibliographically approved

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