Observation of inclusive D*+- production in the decay of Upsilon(1S)

Aubert, B.; Karyotakis, Y.; Lees, J.P.; Poireau, V.; Prencipe, E.; Prudent, X.; Tisserand, V.; Tico, J.Garra; Grauges, E.; Martinelli, M.

doi:10.1103/PhysRevD.81.011102

Observation of inclusive D*+- production in the decay of Upsilon(1S)

BaBar

Collaboration

•

B. Aubert
(
- Annecy, LAPP
)

Nov, 2009

8 pages

Published in:

Phys.Rev.D 81 (2010) 011102

e-Print:

0911.2024 [hep-ex]

DOI:

10.1103/PhysRevD.81.011102

PDG:

{{\mathit \Upsilon}{(1S)}}

\rightarrow

{{\mathit D}^{*}{(2010)}^{\pm}}

anything

Report number:

SLAC-PUB-13837,
BABAR-PUB-09-030

Experiments:

SLAC-PEP2-BABAR

View in:

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Abstract: (arXiv)

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

.

Note:

8 pages, 4 postscript figures, submitted to PRD-RC

13.87.Fh
13.25.Gv
14.65.Dw
electron positron: annihilation
Upsilon(10020): cascade decay
Upsilon(9460): decay
D*(2010): inclusive production
quark antiquark: annihilation
charm: pair production
charm: fragmentation

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