57. International Winter Meeting on Nuclear Physics

Search for a stable six-quark state in Upsilon decays

22 Jan 2019, 17:00

20m

Bormio, Italy

Short Contribution Tuesday Afternoon Session

Speaker

Prof. Wolfgang Gradl (Universität Mainz)

Description

Recently, it has been proposed that the six-quark combination uuddss could be a deeply bound state S, called the "sexaquark". Depending on its mass, S could have a lifetime longer than the age of the universe, or even be absolutely stable. This makes S a good Dark Matter candidate, if it exists. In this talk we present the first search for a stable, deeply-bound, doubly strange six-quark state in the decay Upsilon --> S Lambdabar Lambdabar, using a data sample of 90 M Upsilon(2S) and 110 M Upsilon(3S) decays collected by the BABAR experiment. No signal is observed, and upper limits on the combined Upsilon(nS) --> S Lambdabar Lambdabar branching fractions are derived, setting stringent limits on the existence of such an exotic particle. [Ref: BABAR Collaboration, Search for a Stable Six-Quark State at BABAR, arXiv:1810.04724, submitted to PRL]

Summary

Recently, it has been proposed that the six-quark combination uuddss
could be a deeply bound state S, called the "sexaquark". Depending on
its mass, S could have a lifetime longer than the age of the universe,
or even be absolutely stable. This makes S a good Dark Matter
candidate, if it exists.

In this talk we present the first search for a stable, deeply-bound,
doubly strange six-quark state in the decay Upsilon --> S Lambdabar
Lambdabar, using a data sample of 90 M Upsilon(2S) and 110 M
Upsilon(3S) decays collected by the BABAR experiment. No signal is
observed, and upper limits on the combined Upsilon(nS) --> S Lambdabar
Lambdabar branching fractions are derived, setting stringent limits on
the existence of such an exotic particle.

[Ref: BABAR Collaboration, Search for a Stable Six-Quark State at
BABAR, arXiv:1810.04724, submitted to PRL]

Presentation materials

Slides

1-gradl.pdf