1. Recent ATLAS results Woochun Park @ USC Physics Seminar April 13, 2011 The ATLAS detector Heavy Flavor Physics at ATLAS Observation of Charmonium, Upsilon & Charm Mesons Inclusive differential cross-section of J/  production and Charm Mesons. Measurement of the fraction of non-prompt J/  decays & non- prompt cross sections Exclusive B-meson decays. Higgs Search at ATLAS (not today) Summary and Outlook April 13, 2011W. Park USC Physics Seminar1

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3. The ATLAS Muon Spectrometer Crucial measurement by CSC before toroidal field and materials. High counting rate area near the beam axis ( > 200Hz/cm 2 ) Excellent track resolution ~60  m. Good two track resolution Good time resolution ~7ns 3 planes of trigger and precision chambers individually o Barrel: sagitta measurement o Endcap: point-angle measurement MDT TGC CSC RPC April 13, 2011W. Park USC Physics Seminar3

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7. Observation of  cJ (1P) Measurement of the  c cross-section in 7TeV pp collision is interesting topic being actively worked by many theorists. Theoretical prediction of the  c production cross-sections is difficult due to P-wave divergences in the theory. One of the significant uncertainty of J/  cross-section measurement is  c contribution through  J/  Measurement of  c cross-section will benefic J/  cross-section measurement. Two approaches: – Calorimetric Photon Information – Tracking Photon Information (ee pair conversion) W. Park USC Physics Seminar7April 13, 2011 Mass (MeV) Mass-M(J/  BF(%) of  J/   c0 3414.75317.831.16 ± 0.08  c1 3510.66413.7434.4 ± 1.5  c2 3556.20459.2819.5 ± 0.8

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12. D *+ Cross-section Measurement using D 0  K3  April 13, 2011 Validated result with independent decay channel. W. Park USC Physics Seminar12

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16. Evaluate Tracking Performance D *+  D 0  ; D 0  K3  D *+  D 0  ; D 0  K  April 13, 2011W. Park USC Physics Seminar16

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