Use this URL to cite or link to this record in EThOS: http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.656336
Title: Measurement of CP violation in Bo/d mixing using Bo/d → D* - µ + (vµ) X decays
Author: Ross, Anthony
Awarding Body: Lancaster University
Current Institution: Lancaster University
Date of Award: 2012
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Abstract:
This thesis describes the measurement of the time-integrated semileptonic charge asymmetry in Bo/d mixing, ad/sl, using the decay chain of Bo/d -> D*-μ,+ (vμ), D*- -> D°π-, DO -> K+π-. Decay candidates are reconstructed from lO.4 fb-1 of data recorded by the DØ detector at Fermilab's Tevatron pp collder during the 2002- 2011 'RunII' data takin~ period. Yields are extracted using a X2 minimising simultaneous binned fit where 490k D* candidates are reconstructed. Factoring in the probability of a candidate Bo/d mixing using simulated data, the corresponding semileptonic charge asymmetry value was found to be, ad/sl = [1.10 ± 0.62 (stat) ± 0.08 (syst)]% This result is 1.8 standard deviations from zero and the Standard Model predicted value, and l.4 standard deviations from the 2011 world average. This value is more precise than any single result which is used in the 2011 HFAG world average for ad/sl. If this value were to be included in the world average, then the approximate value would become -0.08 ± 0.37 %. The measurements presented in this thesis was made possible due to sophisticated online and offline reconstruction software, precise track~ng systems, and the first-order background asymmetry negating magnet polarity reversal of the DØ detector.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.656336  DOI: Not available
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