b --> s gamma using a Sum of Exclusive Modes
| dc.creator | The BABAR Collaboration | |
| dc.creator | Aubert, B. | |
| dc.date | 2002-07-24 | |
| dc.date.accessioned | 2026-07-07T03:35:25Z | |
| dc.date.available | 2026-07-07T03:35:25Z | |
| dc.description | This paper describes preliminary results on the inclusive process b --> s gamma obtained from 20.7 fb^-1 of data recorded with the BaBar detector during 1999-2000. Signal event yields are found from a combination of twelve exclusive decay channels after subtracting continuum and BBbar backgrounds. Cross-feed from incorrectly reconstructed b --> s gamma events is also removed. Branching fractions in bins of hadronic mass are calculated using corrected Monte Carlo signal efficiencies; this is equivalent to measuring the gamma energy spectrum. We measure the first moment of the gamma energy spectrum constraining the HQET parameter LambdaBar = (0.37 +/- 0.09 (stat) +/- 0.07 (syst) +/- 0.10 (model)) GeV/c^2. A fit to the hadronic mass spectrum gives B(b --> s gamma) = (4.3 +/- 0.5 (stat) +/- 0.8 (syst) +/- 1.3 (model))x 10^-4 for the inclusive branching fraction. We also constrain the HQET parameter lambda_1. | |
| dc.description | 21 pages, 18 postscript figures, submitted to ICHEP2002 | |
| dc.identifier | https://arxiv.org/abs/hep-ex/0207074 | |
| dc.identifier | http://arxiv.org/abs/hep-ex/0207074 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/37344 | |
| dc.subject | High Energy Physics - Experiment | |
| dc.title | b --> s gamma using a Sum of Exclusive Modes | |
| dc.type | text |