Probing for the Charm Content of $B$ and $Υ$ Mesons

Details Probing for the Charm Content of $B$ and $Υ$ Mesons Probing for the Charm Content of $B$ and $Υ$ Mesons

2001-01-15

arxiv.org/abs/hep-ph/0101162v2

Phys.Rev. D64 (2001) 071501

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 pages, REVTEX, 10 eps figures included. Major revision with more discussions on the rescattering background, and a reapprais

Scientific paper

10.1103/PhysRevD.64.071501

A slow $J/\psi$ bump exists in the inclusive $B\to J/\psi + X$ spectrum, while the softness of $J/\psi$ spectrum in $\Upsilon(1S) \to J/\psi + X$ decay is in strong contrast with expectations from color octet mechanism. We propose {\it intrinsic} charm as the explanation:the former is due to $\bar B\to J/\psi D \pi$,with three charm quarks in the final state; the latter is just a small fraction of $\Upsilon(1S) \to (c\bar c)_{\rm slow} + 2$"jet" events, where the slow moving $c\bar c$ system evolves into $D^{(*)}$ pairs. Experimental search for these phenomena at B Factories and the Tevatron is strongly urged, as the implications go beyond QCD.

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