New, high statistics measurement of the K+ -> pi0 e+ nu (Ke3) branching ratio

Abstract

E865 at the Brookhaven National Laboratory AGS collected about 70,000 K+(e3) events with the purpose of measuring the relative K+(e3) branching ratio. The pi0 in all the decays was detected using the e+e- pair from pi0 -> e+e-gamma decay and no photons were required. Using the Particle Data Group branching ratios for the normalization decays we obtain BR(K+(e3(gamma))=(5.13+/-0.02(stat)+/-0.09(sys)+/-0.04(norm))%, where $K+(e3(gamma))includestheeffectofvirtualandrealphotons.Thisresultis2.3sigmahigherthanthecurrentParticleDataGroupvalue.Theimplicationsofthisresultforthe$V_{us}$ element of the CKM matrix, and the matrix's unitarity are discussed.

arXiv comment4 pages, 5 figures; final version accepted by PRL

References in corpus (7)

• Radiative Semileptonic Kaon Decays
• $K_{\ell 3}$ decays in Chiral Perturbation Theory
• Radiative corrections to K_{l3} decays
• The Evaluation of V_{ud}, Experiment and Theory
• Radiative Corrections to the $K_{e3}^{\pm }$ Decay Revised
• Updating V_us from kaon semileptonic decays
• Study of the K- -> mu- nu pi0 decay

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