Observation of the Bottomonium Ground State in the Decay Y(3S) to ynb Page: 7 of 7
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the yield of XbJ(2P) in data to the number of expected
events, which is calculated from the known branching
fractions , the number of T(3S) events, and MC re-
construction efficiency of XbJ(2P). They show a 13%
discrepancy, but are consistent within the errors. We as-
sign the full difference to the systematic uncertainty. A
total uncertainty in E is obtained, after adding the uncer-
tainties in the XbJ(2P) branching fractions (18%).
In conclusion, we have observed, with a significance of
10 standard deviations, the radiative decay of the T(3S)
to a narrow state lying slightly below the T(1S). The
most likely interpretation of the signal peak is the T(3S)
transition to the bottomonium ground state, although
other hypotheses, such as a radiative transition to a light
Higgs boson, are not excluded. Under the bottomonium
interpretation, this is the first evidence for the Yb bot-
tomonium state, the pseudoscalar partner of the T(1S).
The mass of the Yb is 9388.9+i. 2.7 MeV/c2, which
corresponds to a mass splitting between the T(1S) and
the Yb of 71.4-2.3 2.7 MeV/c2. The estimated branch-
ing fraction of the decay T(3S) -> 71b is found to be
(4.8 0.5 1.2) x 10-4.
We are grateful for the excellent luminosity and ma-
chine conditions provided by our PEP-II colleagues, and
for the substantial dedicated effort from the computing
organizations that support BABAR. We thank Bob McEl-
rath and Michael Peskin for helpful discussions. The
collaborating institutions wish to thank SLAC for its
support and kind hospitality. This work is supported
by DOE and NSF (USA), NSERC (Canada), CEA and
CNRS-IN2P3 (France), BMBF and DFG (Germany),
INFN (Italy), FOM (The Netherlands), NFR (Norway),
MES (Russia), MEC (Spain), and STFC (United King-
dom). Individuals have received support from the Marie
Curie EIF (European Union) and the A. P. Sloan Foun-
t Now at Temple University, Philadelphia, Pennsylvania
$ Now at Tel Aviv University, Tel Aviv, 69978, Israel
Also with Universit di Perugia, Dipartimento di Fisica,
Also with Universitx di Roma La Sapienza, I-00185
** Now at University of South Alabama, Mobile, Alabama
tt Also with University di Sassari, Sassari, Italy
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Aubert, B. Observation of the Bottomonium Ground State in the Decay Y(3S) to ynb, article, July 11, 2008; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc895669/m1/7/: accessed October 23, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.