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Studies of D Semileptonic Decays at CLEO-c

Studies of D Semileptonic Decays at CLEO-c. Bo Xin. Ph.D. Thesis Defense West Lafayette, Indiana, April 14, 2009. Introducing Myself. A one word definition A HEP graduate Student from China, working on D semileptonic decays at the CLEO-c experiment. Introducing Myself.

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Studies of D Semileptonic Decays at CLEO-c

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  1. Studies of D Semileptonic Decays at CLEO-c Bo Xin Ph.D. Thesis Defense West Lafayette, Indiana, April 14, 2009 Studies of D Semileptonic Decay at CLEO-c Bo Xin

  2. Introducing Myself • A one word definition • A HEP graduate Student from China, working on D semileptonic decays at the CLEO-c experiment Studies of D Semileptonic Decay at CLEO-c Bo Xin

  3. Introducing Myself • Before I came to Purdue • A Graduate Student working on Ψ(2S) decays at the BEijing Spectrometer (BES) experiment • A one word definition • A HEP graduate Student from China, working on D semileptonic decays at the CLEO-c experiment Studies of D Semileptonic Decay at CLEO-c Bo Xin

  4. Introducing Myself • Before I came to Purdue • A Graduate Student working on Ψ(2S) decays at the BEijing Spectrometer (BES) experiment • A summary of my years at Purdue • 5 years in graduate school • 4 physics analyses • 3 years of service work • A one word definition • A HEP graduate Student from China, working on D semileptonic decays at the CLEO-c experiment Studies of D Semileptonic Decay at CLEO-c Bo Xin

  5. Introducing Myself • Before I came to Purdue • A Graduate Student working on Ψ(2S) decays at the BEijing Spectrometer (BES) experiment • A summary of my years at Purdue • 5 years in graduate school • 4 physics analyses • 3 years of service work • 2 great universities (Purdue & Cornell) • 1 great adviser Thank you! • A one word definition • A HEP graduate Student from China, working on D semileptonic decays at the CLEO-c experiment Studies of D Semileptonic Decay at CLEO-c Bo Xin

  6. Physics Analyses Entered Purdue: Aug 2004 Qualifying exam: Aug 2004, Preliminary exam: Oct 2006 Graduating: May 2009 2005 2006 2007 2008 2009 Batbold’s thesis Jan 07 - Oct 08 Jul 05 - Feb 07 Oct 06 - Jan 09 Jun 07 - Mar 09 Studies of D Semileptonic Decay at CLEO-c Bo Xin

  7. CLEO-c The CLEO-c detector CLEO-c  CLEO III – SVX + ZD – 0.5 T Most relevant to D semileptonic decays CLEO III General purpose symmetric detector p/p = 0.6% at 800 MeV/c E/E = 2% at 1 GeV, 5% at 100 MeV 93% coverage (charged and neutral) Excellent electron and particle ID • Advantages of running at Charm threshold • Low multiplicity • High tagging efficiency Studies of D Semileptonic Decay at CLEO-c Bo Xin

  8. e+e-y(3770)DD Analysis Technique • Candidate events are selected by reconstructing a D, called a tag, in several hadronic modes • Then we reconstruct the semileptonic decay in the system recoiling from the tag. • Two key variables in the reconstruction of a tag: • For semileptonic D : Tagging creates a single D beam of known 4-momentum Studies of D Semileptonic Decay at CLEO-c Bo Xin

  9. D tagging at CLEO-c 818 pb-1 @3770 Plots from 818/pb DK/πe+ analysis Pure DD, zero additional particles, ~5-6 charged particles per event ~6.6x 105 D0 and ~4.8 x 105 D+ tags reconstructed from ~5.2 x 106 DD events We tag ~20% of the events, compared to ~0.1% of B’s at the Y(4S) Studies of D Semileptonic Decay at CLEO-c Bo Xin

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