Piatenko, Timofei (2009) Search for B to rho/omega gamma decays at BaBar. Dissertation (Ph.D.), California Institute of Technology. http://resolver.caltech.edu/CaltechETD:etd-08252008-225854
We present the results of the search for the decays ß(0/±) ? ?(0/±)? (previously observed) and ß0 ? ?? (for which currently only an upper limit exists). Together with ß ? K*? decays, B ? (?/?)? allow us to measure the ratio of CKM-matrix elements |Vtd/Vts|. The analysis is based on the full BaBar dataset of 424.35 fb-1, corresponding to 465 million BB pairs, and makes heavy use of multivariate classification techniques based on decision trees. We find ßR(B ? ?±? ) = (1.20+0.42-0.38±0.20)×10-6, ßR(B ? ?0?)= (0.95+0.23-0.21 ±0.06)×10-6, and ßR(B ? ??)=(0.51+0.27-0.24±0.10)×10-6, where the first error is statistical and the second is systematic. We do not observe a statistically significant signal in the latter channel and set an upper limit at ßR(B ? ??) < 0.9 × 10-6 (90% C.L.). We also measure the isospin and SU(3)F violating quantities ?(B+ ? ?+?)/2?(B0 ? ?0?) - 1 = -0.43+0.25-0.22±0.10 and ?(B ? ??)/?(B0 ? ?0?) - 1 = -0.49+0.30-0.27±0.10.
|Item Type:||Thesis (Dissertation (Ph.D.))|
|Subject Keywords:||bagged decision trees; radiative penguin B decays|
|Degree Grantor:||California Institute of Technology|
|Division:||Physics, Mathematics and Astronomy|
|Thesis Availability:||Public (worldwide access)|
|Defense Date:||28 July 2008|
|Default Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Imported from ETD-db|
|Deposited On:||22 Oct 2008|
|Last Modified:||26 Dec 2012 02:58|
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