I have been a member of the Belle collaboration between 2002 and 2003 as a JSPS fellow. I have been first involved in the tracking working group and have then measured the inclusive b->s gamma branching fraction and photon energy shape.

• Official Belle page at KEK.
• Official JSPS page.

• The LHCb experiment at CERN.
• Much more B physics links.

My main result at Belle is the fully inclusive measurement of the flavour changing neutral current decay b → sγ in the energy range 1.8 GeV < E* < 2.8 GeV, covering 95% of the total spectrum. Using 140 fb^-1 I obtain BF(b → sγ)= (3.55 ± 0.32 ± 0.31 (+0.07-0.11)) 10^-4, where the errors are statistical, systematic and from theory corrections. I also measure the first and second moments of the photon energy spectrum above 1.8 GeV and obtain <E> = 2.292 ± 0.026 ± 0.034 GeV and <E²>-<E>² = 0.0305 ± 0.0074 ± 0.0063 GeV², where the errors are statistical and systematic.

• Published: Phys. Rev. Lett. 93, 061803 (2004). (PRL online)
• Preprints: ArXiv:hep-ex/0403004. Belle-2004-6 (ps.gz). Figures: Fig.1, Fig.2.
• Cited by: List from Spires. TOPCITE = 100+.
• Talk: CERN EP Seminar. Radiative B decays at Belle.
• Internal documentation: Belle Notes 665-669.

Tracking studies

I have also measured Belle's tracking efficiency using partially reconstructed D^* -> D⁰(K_sππ)π decays.

Internal documentation: Belle Note 621.