Measurement of the Λ<sup>0</sup><sub>b</sub> lifetime in Λ<sup>0</sup><sub>b</sub> → Λ<sup>+</sup><sub>c</sub>π<sup>-</sup> decays at the Collider Detector at Fermilab

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The lifetime of the Λ<sup>0</sup><sub>b</sub> baryon (consisting of u, d and b quarks) is the theoretically most interesting of all b-hadron lifetimes. The lifetime of Λ<sup>0</sup><sub>b</sub> probes our understanding of how baryons with one heavy quark are put together and how they decay. Experimentally however, measurements of the Λ<sup>0</sup><sub>b</sub> lifetime have either lacked precision or have been inconsistent with one another. This thesis describes the measurement of Λ<sup>0</sup><sub>b</sub> lifetime in proton-antiproton collisions with center of mass energy of 1.96 TeV at Fermilab's Tevatron collider. Using 1070 ± 60pb<sup>-1</sup> of data collected by the Collider Detector at Fermilab (CDF), a clean ... continued below

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214 p.

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Mumford, Jonathan Reid September 1, 2008.

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The lifetime of the Λ<sup>0</sup><sub>b</sub> baryon (consisting of u, d and b quarks) is the theoretically most interesting of all b-hadron lifetimes. The lifetime of Λ<sup>0</sup><sub>b</sub> probes our understanding of how baryons with one heavy quark are put together and how they decay. Experimentally however, measurements of the Λ<sup>0</sup><sub>b</sub> lifetime have either lacked precision or have been inconsistent with one another. This thesis describes the measurement of Λ<sup>0</sup><sub>b</sub> lifetime in proton-antiproton collisions with center of mass energy of 1.96 TeV at Fermilab's Tevatron collider. Using 1070 ± 60pb<sup>-1</sup> of data collected by the Collider Detector at Fermilab (CDF), a clean sample of about 3,000 fully-reconstructed Λ<sup>0</sup><sub>b</sub> →Λ<sub>c</sub><sup>+</sup>π<sup>-</sup> decays (with Λ<sup>+</sup><sub>c</sub> subsequently decaying via Λ<sup>+</sup><sub>c</sub> → p<sup>+</sup> K<sup>-</sup> π<sup>+</sup>) is used to extract the lifetime of the Λ<sup>0</sup><sub>b</sub> baryon, which is found to be cτ(Λ<sup>0</sup><sub>b</sub>) = 422.8 ± 13.8(stat) ± 8.8(syst)μm. This is the most precise measurement of its kind, and is even better than the current world average. It also settles the recent controversy regarding the apparent inconsistency between CDF's other measurement and the rest of the world.

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214 p.

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  • Report No.: FERMILAB-THESIS--2008-97
  • Grant Number: AC02-07CH11359
  • DOI: 10.2172/982485 | External Link
  • Office of Scientific & Technical Information Report Number: 982485
  • Archival Resource Key: ark:/67531/metadc1014152

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  • September 1, 2008

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Mumford, Jonathan Reid. Measurement of the Λ<sup>0</sup><sub>b</sub> lifetime in Λ<sup>0</sup><sub>b</sub> → Λ<sup>+</sup><sub>c</sub>π<sup>-</sup> decays at the Collider Detector at Fermilab, thesis or dissertation, September 1, 2008; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc1014152/: accessed August 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.