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Recent results on quarkonium spectroscopy from BaBar and Belle Bryan Fulsom SLAC National Accelerator Laboratory XXIII iemes Rencontres de Blois Blois, France June 1, 2011 Slide 2 Heavy quark (q=c,b) bound system: qq Existence, masses, widths, quantum numbers Phenomenological models, effective field theory, lattice QCD Quarkonium Spectroscopy BaBar/Belle Quarkonium Spectroscopy / Bryan Fulsom / Rencontres de Blois / 2011.06.01 / Page 2/26 Slide 3 The Experiments BaBar/Belle Quarkonium Spectroscopy / Bryan Fulsom / Rencontres de Blois / 2011.06.01 / Page 3/26 Operated over the past decade, accumulating ~1.5 ab -1 Quarkonium production via B/ (nS) decay, , ISR Slide 4 Decay of X(3872) J/ X(3872) mass, width and BF measurements Radiative decays of the X(3872) Search for X(3872) J/ and (2S) Recoil against in (3S) b (2P) b (1P) transitions, (3S) mass, h b (1P) search Recoil against in (2S) First evidence for h b (1P) Bottomonium transitions with converted photons Radiative decays of (nS) and b (nP), b (1S) search Topics covered today BaBar/Belle Quarkonium Spectroscopy / Bryan Fulsom / Rencontres de Blois / 2011.06.01 / Page 4/26 Slide 5 Topics not covered today BaBar/Belle Quarkonium Spectroscopy / Bryan Fulsom / Rencontres de Blois / 2011.06.01 / Page 5/26 Slide 6 X(3872) BaBar/Belle Quarkonium Spectroscopy / Bryan Fulsom / Rencontres de Blois / 2011.06.01 / Page 6/26 Slide 7 Discovered by Belle in B X K , X J/ Since measured by BaBar, CDF, D, LHC Also decays to DD*, J/ , and J PC assignment 1 ++ or 2 -+ DD* molecule, charmonium, or tetraquark? Mass, width, decays, rates can test these theories Mass above or below DD* threshold? Tetraquark predicts splitting between neutral and charged B decay Width Narrow, best limit 0 > 1 unusual for quarkonium (3S) : 300