Search for an $H$-dibaryon with mass near $2m_\Lambda$ in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays - INSPIRE

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Search for an $H$ -dibaryon with mass near $2m_\Lambda$ in $\Upsilon(1S)$ and $\Upsilon(2S)$ decays

Belle

Collaboration

Feb 16, 2013

6 pages

Published in:

Phys.Rev.Lett. 110 (2013) 22, 222002

Published: May 31, 2013

e-Print:

1302.4028 [hep-ex]

DOI:

10.1103/PhysRevLett.110.222002

Experiments:

KEK-BF-BELLE

View in:

reference search74 citations

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Abstract: (APS)

We report the results of a high-statistics search for H dibaryon production in inclusive Υ(1S) and Υ(2S) decays. No indication of an H dibaryon with a mass near the MH=2mΛ threshold is seen in either the H→Λpπ- or ΛΛ decay channels and 90% confidence level branching-fraction upper limits are set that are between one and two orders of magnitude below the measured branching fractions for inclusive Υ(1S) and Υ(2S) decays to antideuterons. Since Υ(1S,2S) decays produce flavor-SU(3)-symmetric final states, these results put stringent constraints on H dibaryon properties. The results are based on analyses of 102 million Υ(1S) and 158 million Υ(2S) events collected with the Belle detector at the KEKB e+e- collider.

Note:

6 pages, 3 figures, submitted for publication in Physical Review Letters

13.85.Rm
12.39.Ba
14.20.Pt
Upsilon(10020): branching ratio: upper limit
Upsilon(9460): branching ratio: upper limit
electron positron: annihilation
Lambda Lambda: mass spectrum
BELLE
KEK-B
upsilon mesons: electroproduction

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Figures(6)

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