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Observation of h(c) Radiative Decay h(c) -> gamma eta ' and Evidence for h(c) -> gamma eta
Inst High Energy Phys, Beijing 100049, Peoples R China..
GI Budker Inst Nucl Phys SB RAS BINP, Novosibirsk 630090, Russia.;Novosibirsk State Univ, Novosibirsk 630090, Russia..
Inst High Energy Phys, Beijing 100049, Peoples R China..
Carnegie Mellon Univ, Pittsburgh, PA 15213 USA..
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2016 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 116, no 25, 251802Article in journal (Refereed) PublishedText
Abstract [en]

A search for radiative decays of the P-wave spin singlet charmonium resonance h(c) is performed based on 4.48 x 10(8) psi' events collected with the BESIII detector operating at the BEPCII storage ring. Events of the reaction channels h(c) -> gamma eta' and gamma eta are observed with a statistical significance of 8.4 sigma and 4.0 sigma, respectively, for the first time. The branching fractions of h(c) -> gamma eta' and h(c) -> gamma eta' are measured to be B(h(c) -> gamma eta') = (1.52 +/- 0.27 +/- 0.29) x 10(-3) and B(h(c) -> gamma eta) = (4.7 +/- 1.5 +/- 1.4) x 10(-4), respectively, where the first errors are statistical and the second are systematic uncertainties.

Place, publisher, year, edition, pages
2016. Vol. 116, no 25, 251802
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-299895DOI: 10.1103/PhysRevLett.116.251802ISI: 000378209900007PubMedID: 27391715OAI: oai:DiVA.org:uu-299895DiVA: diva2:950522
Funder
German Research Foundation (DFG), Collaborative Research Center CRC-1044Swedish Research Council
Available from: 2016-08-01 Created: 2016-07-29 Last updated: 2016-08-01Bibliographically approved

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Johansson, TordKupsc, AndrzejLi, CuiPettersson, JoachimSchönning, KarinWolke, Magnus
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