Observation of Xc1 Decays into Vector Meson Pairs ϕϕ, ωωandωυ.
In: Physical Review Letters, Jg. 107 (2011-08-26), Heft 9, S. 1-6
academicJournal
Zugriff:
Using (106 ± 4) x 106 ~i(3686) events accumulated with the BESIII detector at the BEPCII e~e collider, we present the first measurement of decays of x~i to vector meson pairs ~ ww, and n~i. The branching fractions are measured to be (4.4 ± 0.3 ± 0.5) x 10-4, (6.0 ± 0.3 ± 0.7) X 10-4, arid (2.2 ± 0.6 ± 0.2) X 10-5, for xc~ -~ 41~ ww, and ~ respectively, which indicates that the hadron helicity selection rule is significantly violated in XcJ decays. In addition, the measurement of XcJ↠ ω ɸ provides the first indication of the rate of doubly OZI-suppressed xcj decay. Finally, we present improved measurements for the branching fractions of xco and Xc2 to vector meson pairs. [ABSTRACT FROM AUTHOR]
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Observation of Xc1 Decays into Vector Meson Pairs ϕϕ, ωωandωυ.
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Zeitschrift: | Physical Review Letters, Jg. 107 (2011-08-26), Heft 9, S. 1-6 |
Veröffentlichung: | 2011 |
Medientyp: | academicJournal |
ISSN: | 0031-9007 (print) |
DOI: | 10.1103/PhysRevLett.107.092001 |
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