Abstract/Details

Search for neutral <i>D</i> meson mixing using semileptonic decays


2004 2004

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Abstract (summary)

Based on a 87 fb−1 dataset, a search for D0-0 mixing is made using the semileptonic decay modes D*+ → π +D0, D0 → [K/K*]eν (+c.c.) at the B-Factory facility at the Stanford Linear Accelerator Center. These modes offer unambiguous initial and final-state charm flavor tags, and allow the combined use of the D0 lifetime and D*+- D0 mass difference (ΔM) in a global likelihood fit. The high-statistics sample of reconstructed unmixed semileptonic D0 decays is used to model both the ΔM distribution and the time-dependence of mixed events directly from the data. Neural networks are used both to select events and to fully reconstruct the D0. A result consistent with no charm mixing has been obtained, Rmix = 0.0023 ± 0.0012(stat) ± 0.0004(sys ). This corresponds to an upper limit of Rmix < 0.0047 (95% C.L.) and Rmix < 0.0043 (90% C.L.). The lowest current published limit on semileptonic charm mixing is 0.005 (90% C.L.) (E791, E.M. Aitala et al., Phys.Rev.Lett. 77 2384 (1996)). The current best published limit using any analysis technique on the total rate of charm mixing is 0.0016 (95% C.L.) (Babar Kπ mixing, B. Aubert et al., Phys.Rev.Lett. 91 171801 (2003)).

Indexing (details)


Subject
Particle physics
Classification
0798: Particle physics
Identifier / keyword
Pure sciences; Charm decays; D mesons; Electroweak; Flavor mixing; Semileptonic decays
Title
Search for neutral <i>D</i> meson mixing using semileptonic decays
Author
Flood, Kevin T.
Number of pages
178
Publication year
2004
Degree date
2004
School code
0118
Source
DAI-B 65/06, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
Advisor
Hertzbach, Stanley S.
University/institution
University of Massachusetts Amherst
University location
United States -- Massachusetts
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3136725
ProQuest document ID
305176183
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305176183
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