Search for baryons in the radiative penguin decay b ---> s gamma
May, 20038 pages
Published in:
- Phys.Rev.D 68 (2003) 011102
e-Print:
- hep-ex/0305005 [hep-ex]
Report number:
- CLNS-03-1824,
- CLEO-03-08
Experiments:
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Citations per year
Abstract:
We have searched for the baryon-containing radiative penguin decays B^- -> \Lambda p-bar \gamma and B^- -> \Sigma^0 p-bar \gamma, using a sample of 9.7 million BBbar events collected at the \Upsilon(4S) with the CLEO detector. We find no evidence for either, and set 90% confidence level upper limits for photons with B rest frame energy greater than 2.0 GeV of [Br(B^- -> \Lambda p-bar \gamma) + 0.3 Br(B^- -> \Sigma^0 p-bar \gamma)] < 3.3 x 10^-6, [Br(B^- -> \Sigma^0 p-bar \gamma) + 0.4 Br(B^- -> \Lambda p-bar \gamma)] < 6.4 x 10^-6. From the latter, we estimate (for photons with B rest frame energy greater than 2.0 GeV) Br(B -> X_s \gamma, X_s containing baryons) < 3.8 x 10^-5. This limit implies upper limits on corrections to CLEO's recent measurement of branching fraction, mean photon energy, and variance in photon energy from b -> s \gamma that are less than half the combined statistical and systematic errors quoted on these quantities.- 13.20.He
- 13.60.Rj
- 13.40.Hq
- talk: Les Arcs 2003/03/22
- electron positron: colliding beams
- electron positron: annihilation
- Upsilon(10570): electroproduction
- B: pair production
- B-: radiative decay
- baryon: production
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