Evidence for the h[subscript b](1P) meson in the decay Υ(3S)→π[superscript 0]h[subscript b](1P)

• Main Authors: Cowan, Ray Franklin (Contributor), Dujmic, Denis (Contributor), Sciolla, Gabriella (Contributor)
• Other Authors: Massachusetts Institute of Technology. Laboratory for Nuclear Science (Contributor)
• Format: Article
• Language: English
• Published: American Physical Society, 2012-06-26T12:20:17Z.
• Subjects: Article
• Online Access: Get fulltext

Using a sample of 122×10[superscript 6] Υ(3S) events recorded with the BABAR detector at the PEP-II asymmetric-energy e[superscript +]e[superscript -] collider at SLAC, we search for the h[subscript b](1P) spin-singlet partner of the P-wave χ[subscript bJ](1P) states in the sequential decay Υ(3S)→π[superscript 0]h[subscript b](1P), h[subscript b](1P)→γη[subscript b](1S). We observe an excess of events above background in the distribution of the recoil mass against the π[superscript 0] at mass 9902±4(stat)±2(syst)  MeV/c[superscript 2]. The width of the observed signal is consistent with experimental resolution, and its significance is 3.1σ, including systematic uncertainties. We obtain the value (4.3±1.1(stat)±0.9(syst))×10[superscript -4] for the product branching fraction B(Υ(3S)→π[superscript 0]h[subscript b])×B(h[subscript b]→γη[subscript b]).