Reconstruction of B^-→ D^*0 e^- $$\bar{v}$$_e Decays and Determination of |V_cb|

Thesis/Dissertation · Thu Jan 12 00:00:00 EST 2006

DOI:https://doi.org/10.2172/915390· OSTI ID:915390

Schubert, Jens ^[1]

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1. Stanford Univ., CA (United States)

In this analysis the decay B^-→ D^*0 e^- $$\bar{v}$$_e is measured. The underlying data sampel consists of about 226 million B$$\bar{B}$$-pairs accumulated on the Y(4S) resonance by the BABAR detector at the asymmetric e⁺e^- collider PEP-II. The reconstruction of the decay uses the channels D^*0→D⁰π⁰, D⁰ → K^-π⁺ and π⁰ → γγ. The neutrino is not reconstructed. Since the rest frame of the B meson is unknown, the boost w of the D^*0 meson in the B meson rest frame is estimated by $$\bar{w}$$. The $$\bar{w}$$ spectrum of the data is described in terms of the partial decay width dΓ/dw into an expectation of the measured $$\bar{w}$$ spectrum. dΓ/dw depends on a form factor F(w) parameterizing the strong interaction in the decay process. To find the best descriptive dΓ/dw a fit to the data determines the following two parameters of dΓ/dw: (i) F(1)|V_cb|, the product between F at zero D^*0 recoil and the CKM matrix element |V_cb|; (ii) ρ$$2\atop{A1}$$, a parameter of the form factor F(w). The former parameter scales the height of dΓ/dw and ρ$$2\atop{A1}$$ varies the shape of it.

• Research Organization: SLAC National Accelerator Lab., Menlo Park, CA (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC02-76SF00515
• OSTI ID: 915390
• Report Number(s): SLAC-R--876
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
DECAY
Experiment-HEP
HEPEX
STANFORD LINEAR ACCELERATOR CENTER