Marc Pelizaeus - Meson

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The Babar-Experiment • Asymmetric energy e + e - storage rings PEP-II – ~90% at 10.58 GeV ( ); ~10% at 10.54 GeV – more than 350 fb -1 recorded so far (~1.6x10 9 hadronic events) Solenoid (1.5T) Hadron /Muon Detector • Good track and vertex reconstruction • Good particle identification • Good photon detection (3.1 GeV) (9.0 GeV) Cherenkov Detector Vertex Detector Drift Chamber Electromagnetic Calorimeter M. Pelizäus, Charm and Charmonium Spectroscopy 2
Production of hidden and open charm states • Production in B decays – ~380x10 6 B events – provides access to inclusive measurements of absolute branching fractions • e + e - →c fragmentation processes – ~1x10 9 charmed particles – spectroscopy of open charm states with high precision • Initial state radiation (ISR) e + e - →γ ISR (c) – J/ψ sample: ~14x10 6 events – resonance production in the energy range – only production of J PC =1 -- states) b W c s (*) b charmonium c W q q open charm c q D(s) (*) c ð (*) Babar offers excellent options for charm / charmonium spectroscopy M. Pelizäus, Charm and Charmonium Spectroscopy 3
Page 1: 9 th International Workshop on Meso
Page 5 and 6: • Put further experimental constr
Page 7 and 8: Exclusive study of D sJ (2460) •
Page 9 and 10: Exclusive study: Summary • Decay
Page 11 and 12: Exclusive study of the DK system
Page 13 and 14: Further studies of D sJ *(2860) •
Page 15 and 16: • Tetra quark model - predicts no
Page 17 and 18: Exclusive study of X(3872) • B +
Page 19 and 20: Discovery of Y(4260) • Negative s
Page 21 and 22: • X(3872) (→J/ψπ + π − , J
Page 23 and 24: Backup Slides M. Pelizäus, Charm a
Page 25 and 26: Reflections in D s π 0 Data MC Eff
Page 27 and 28: Babar: 193 fb -1 PRD 71, 031501 (20
Page 29 and 30: Confirmation of Y(4260) from CLEO-I
Page 31: ISR studies of Y(4260) • No indic

Marc Pelizaeus - Meson

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