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2011

Evidence for the h_b(1P) meson in the decay Upsilon(3S) --> pi0 h_b(1P)

The BABAR Collaboration, Lees, J. P., Poireau, V. et al.

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Using a sample of 122 million Upsilon(3S) events recorded with the BaBar detector at the PEP-II asymmetric-energy e+e- collider at SLAC, we search for the $h_b(1P)$ spin-singlet partner of the P-wave chi_{bJ}(1P) states in the sequential decay Upsilon(3S) --> pi0 h_b(1P), h_b(1P) --> gamma eta_b(1S).

We observe an excess of events above background in the distribution of the recoil mass against the pi0 at mass 9902 +/- 4(stat.) +/- 2(syst.) MeV/c^2.
The width of the observed signal is consistent with experimental resolution, and its significance is 3.1sigma, including systematic uncertainties.
We obtain the value (4.3 +/- 1.1(stat.) +/- 0.9(syst.)) x 10^{-4} for the product branching fraction BF(Upsilon(3S)-->pi0 h_b) x BF(h_b-->gamma eta_b).

Evidence for the h_b(1P) meson in the decay Upsilon(3S) --> pi0 h_b(1P) · Around

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