Observation of inclusive $D^{*\pm}$ production in the decay of $Υ(1S)$

Details Observation of inclusive $D^{*\pm}$ production in the decay of $Υ(1S)$ Observation of inclusive $D^{*\pm}$ production in the decay of $Υ(1S)$

2009-11-10

arxiv.org/abs/0911.2024v2

Phys.Rev.D81:011102,2010

Physics

High Energy Physics

High Energy Physics - Experiment

8 pages, 4 postscript figures, published in PRD-RC

Scientific paper

10.1103/PhysRevD.81.011102

We present a study of the inclusive $D^{*\pm}$ production in the decay of $\Upsilon(1S)$ using $(98.6 \pm 0.9)\times 10^6$ $\Upsilon(2S)$ mesons collected with the BaBar detector at the $\Upsilon(2S)$ resonance. Using the decay chain $\Upsilon(2S)\to \pi^+ \pi^- \Upsilon(1S), \Upsilon(1S) \to D^{*\pm} X$, where X is unobserved, we measure the branching fraction $\BR[\Upsilon(1S)\to D^{*\pm} X] = (2.52 \pm 0.13({\rm stat}) \pm 0.15({\rm syst}))%$ and the $D^{*\pm}$ momentum distribution in the rest frame of the $\Upsilon(1S)$. We find evidence for an excess of $D^{*\pm}$ production over the expected rate from the virtual photon annihilation process $\Upsilon(1S)\to\gamma^*\to c\bar c\to D^{*\pm} X$.

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