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Preliminary Study of B0 Decay Vertex Reconstruction Using Hadronic and Semileptonic Modes

This study presents preliminary results on the reconstruction of B0 decay vertices using both hadronic and semileptonic decay modes from 8.9 fb^-1 of data collected at the Upsilon(4S). We investigate the decay chain B0 → D*−l+ν, where D* decays into various final states, including D0 with kaons and pions, and compute the decay time dependence for mixed and unmixed events. Utilizing a likelihood function, we extract tagging dilution parameters. Our findings provide insights into B0 flavor tagging and decay characteristics.

sasha-hanson
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Preliminary Study of B0 Decay Vertex Reconstruction Using Hadronic and Semileptonic Modes

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  1. K+ ps- p- D0 Brec B0 p+ (4S) Btag B0 bZg 0.56 e-, m-, K- tag Dz ~260 mm • Reconstruct B0 decay vertex using hadronic or semileptonic decay modes • Reconstruct tagging vertex, measure Dz= zrec– ztagDt = Dz / < bZ g > • Use e/m/K charge etc. to determine b flavor at the tagging vertex • Time dependence of mixed and unmixed events, in each tagging category (i) is • Form a likelihood function and extract tagging dilution w = (1- Di ) and Dmd PRELIMINARY

  2. Reconstruct hadronic and Semileptonic B0 decays in 8.9 fb-1 (4S) data B0 D* -l+ nl D*- D0 - D0  K-p+ , D0  K-p+ p0 , D0  K-p+ p-p+ • B0 D(*) -p+ •  D(*) -r+ •  D(*) -a1+ •  J/ K*0 Preliminary B0 257759B0 7517104 D*+l+ combinations PRELIMINARY

  3. Likelihood Fit to t Distribution hadronic B0sample PRELIMINARY hadronic sample semileptonic sample combined result

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