Search for B → (ρ/ω) γ decays at BaBar

Thesis/Dissertation · Mon Jul 28 00:00:00 EDT 2008

DOI:https://doi.org/10.2172/938641· OSTI ID:938641

Piatenko, Timofei ^[1]

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1. California Inst. of Technology (CalTech), Pasadena, CA (United States)

The authors present the results of the search for the decays B^0/± → ρ^0/±γ (previously observed) and B⁰ → ωγ (for which currently only an upper limit exists). Together with B → K*γ decays, B → (ρ/ωγ allow us to measure the ratio of CKM-matrix elements |V_td/V_ts|. The analysis is based on the full BABAR dataset of 424.35 fb^-1 corresponding to 465 million B$$\bar{B}$$ pairs, and makes heavy use of multivariate classification techniques based on decision trees. They find β(B^± → ρ^±γ) = (1.20 _-0.38^+0.42 ± 0.20) x 10^-6, β(B⁰ → ρ⁰γ) = (0.95_-0.21^+0.23 ± 0.06) x 10^-6, β(B⁰ → ωγ) = (0.51_-0.24^+0.27 ± 0.10) x 10^-60 → ωγ) < 0.9 x 10^-6 (90% C.L.). They also measure the isospin and SU(3)_F violating quantities Γ(B⁺ → ρ⁺γ)/2Γ(B⁰ → ρ⁰γ)-1 = -0.43_-0.22^+0.25 ± 0.10 and Γ(B⁰ → ωγ)/Γ(B⁰ → ρ⁰γ)-1 = -0.49_-0.27^+0.30 ± 0.10.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 938641
• Report Number(s): SLAC-R--905
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
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