Observation of charmless B meson decays |
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Institution: | 1. Department of Psychiatry, University of California San Diego, La Jolla, CA, 92093, USA;2. The Sam and Rose Stein Institute for Research on Aging, University of California San Diego, La Jolla, CA, 92093, USA;3. VA San Diego Healthcare System, San Diego, CA, 92161, USA |
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Abstract: | Using the ARGUS detector at the e+e− storage ring DORIS II, we have observed charmless decays of B mesons into the final states pp̄π± and pp̄π+π−. The significance of the signal corresponds to more than five standard deviations. The branching ratios are (5.2±1.4±1.9)×10−4 for the three-body and (6.0±2.0±2.2)×10−4 for the four-body final state. These decays cannot proceed via the dominant b→c transitions, and we show that they are not the result of penguin-type processes. Thus, the observed decays must represent b→u quark transitions. Consequently, the Kobayashi-Maskawa matrix element Vub is non-zero. |
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