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

Abstract : 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 $\Upsilon(1S)\to\gamma^*\to c\bar c\to D^{*\pm} X$.
Document type :
Journal articles

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Submitted on : Thursday, November 12, 2009 - 10:11:00 AM
Last modification on : Tuesday, December 22, 2020 - 12:40:02 PM

Citation

B. Aubert, Y. Karyotakis, J.P. Lees, V. Poireau, E. Prencipe, et al.. Observation of inclusive $D^{*\pm}$ production in the decay of $\Upsilon(1S)$. Physical Review D, American Physical Society, 2010, 81, pp.011102. ⟨10.1103/PhysRevD.81.011102⟩. ⟨in2p3-00431347⟩

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