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Search for B → (ρ/ω)γ decays at BABAR


Piatenko, Timofei (2009) Search for B → (ρ/ω)γ decays at BABAR. Dissertation (Ph.D.), California Institute of Technology. doi:10.7907/JFX3-1629.


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
Major Option:Physics
Thesis Availability:Public (worldwide access)
Research Advisor(s):
  • Hitlin, David G.
Thesis Committee:
  • Hitlin, David G. (chair)
  • Weinstein, Alan Jay
  • Porter, Frank C.
  • Wise, Mark B.
Defense Date:28 July 2008
Record Number:CaltechETD:etd-08252008-225854
Persistent URL:
Default Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:3226
Deposited By: Imported from ETD-db
Deposited On:22 Oct 2008
Last Modified:26 Nov 2019 20:24

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