Search for Neutral D Meson Mixing using Semileptonic Decays

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Based on a 87 fb{sup -1} dataset, a search for D{sup 0}-{bar D}{sup 0} mixing is made using the semileptonic decay modes D*{sup +} {yields} {pi}{sup +} D{sup 0}, D{sup 0} {yields} [K/K*]e{nu} (+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 D{sup 0} lifetime and D*{sup +}-D{sup 0} mass difference ({Delta}M) in a global likelihood fit. The high-statistics sample of reconstructed unmixed semileptonic D{sup 0} decays is used to model both the {Delta}M distribution and the time-dependence of mixed events ... continued below

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178 pages

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Flood, Kevin T. & /Massachusetts U., Amherst April 14, 2006.

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Description

Based on a 87 fb{sup -1} dataset, a search for D{sup 0}-{bar D}{sup 0} mixing is made using the semileptonic decay modes D*{sup +} {yields} {pi}{sup +} D{sup 0}, D{sup 0} {yields} [K/K*]e{nu} (+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 D{sup 0} lifetime and D*{sup +}-D{sup 0} mass difference ({Delta}M) in a global likelihood fit. The high-statistics sample of reconstructed unmixed semileptonic D{sup 0} decays is used to model both the {Delta}M 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 D{sup 0}. A result consistent with no charm mixing has been obtained, R{sub mix} < 0.0047 (95% C.L.) and R{sub mix} < 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.) (Bab K{pi} mixing, B. Aubert et al., Phys. Rev. Lett. 91 171801 (2003)).

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178 pages

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  • Report No.: SLAC-R-818
  • Grant Number: AC02-76SF00515
  • DOI: 10.2172/881249 | External Link
  • Office of Scientific & Technical Information Report Number: 881249
  • Archival Resource Key: ark:/67531/metadc885927

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  • April 14, 2006

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  • Sept. 21, 2016, 2:29 a.m.

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  • Dec. 1, 2016, 7 p.m.

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Flood, Kevin T. & /Massachusetts U., Amherst. Search for Neutral D Meson Mixing using Semileptonic Decays, report, April 14, 2006; [Menlo Park, California]. (digital.library.unt.edu/ark:/67531/metadc885927/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.