Observation of inclusive D[superscript *± ] production in the Decay of Υ(1S)

We present a study of the inclusive D[superscript * ±] production in the decay of Υ(1S) using (98.6±0.9)×10[superscript 6] Υ(2S) mesons collected with the BABAR detector at the Υ(2S) resonance. Using the decay chain Υ(2S)→π[superscript +] π[superscript -] Υ(1S), Υ(1S)→D[superscript * ± ]X, where X i...

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Bibliographic Details
Main Authors: BaBar Collaboration (Author), Cowan, Ray F (Contributor), Dujmic, Denis (Contributor), Fisher, Peter H (Contributor), Henderson, Shawn Wesley (Contributor), Sciolla, Gabriella (Contributor), Spitznagel, Michael A (Contributor), Yamamoto, Richard K (Contributor), Zhao, Min Liang (Contributor)
Other Authors: Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
Format: Article
Language:English
Published: American Physical Society (APS), 2018-05-31T19:33:00Z.
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Summary:We present a study of the inclusive D[superscript * ±] production in the decay of Υ(1S) using (98.6±0.9)×10[superscript 6] Υ(2S) mesons collected with the BABAR detector at the Υ(2S) resonance. Using the decay chain Υ(2S)→π[superscript +] π[superscript -] Υ(1S), Υ(1S)→D[superscript * ± ]X, where X is unobserved, we measure the branching fraction B[Υ(1S)→D* ± X]=(2. 52±0.13(stat)±0.15(syst))% and the D* ± momentum distribution in the rest frame of the Υ(1S). We find evidence for an excess of D[superscript * ±] production over the expected rate from the virtual photon annihilation process Υ(1S)→γ *→cc̄→D[superscript * ± ]X.