Measurement of the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay with the KLOE detector

Abstract

We have measured the absolute branching ratio of the K+ -> pi+ pi0 (gamma) decay, using about 20 million tagged K+ mesons collected with the KLOE detector at DAFNE, the Frascati phi-factory. Signal counts are obtained from the fit of the distribution of the momentum of the charged decay particle in the kaon rest frame. The result, inclusive of final-state radiation, is BR(K+ -> pi+ pi0 (gamma))=0.2065+/-0.0005_{stat}+/- 0.0008_{syst}.

arXiv comment14 pages, 2 figures; changed content

References in corpus (14)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Data handling, reconstruction, and simulation for the KLOE experiment
• Isospin Breaking in K -> Pi Pi Decays
• Measurements of the Absolute Branching Ratios for the Dominant KL Decays, the KL Lifetime, and Vus with the KLOE Detector
• Study of the branching ratio and charge asymmetry for the decay Ks->pi e nu with the KLOE detector
• Monte Carlo simulation for radiative kaon decays
• Measurement of the Absolute Branching Ratio for the K+ -> mu+ nu(gamma) Decay with the KLOE Detector
• Measurement of the Branching Ratio of the KL -> pi+pi- decay with the KLOE Detector
• Precise measurement of Gamma(Ks->pi+pi-(gamma))/Gamma(Ks->pi0pi0) with the KLOE detector at DAFNE
• Measurements of Charged Kaon Semileptonic Decay Branching Fractions K^+- -> pi^0 mu^+- nu and K+- -> pi^0 e^+- nu and Their Ratio
• Measurement of the branching fraction for the decay KS --> pi e nu
• Measurement of the branching ratio for the decay $K^{\pm }\to {\pi }^{\pm }{\pi }^0{\pi }^0$ with the KLOE detector

Cited by in corpus (4)

• Physics with the KLOE-2 experiment at the upgraded DA$\varphi$NE
• An evaluation of |Vus| and precise tests of the Standard Model from world data on leptonic and semileptonic kaon decays
• Scrutinizing CKM unitarity with a new measurement of the $K_{\mu 3}/K_{\mu 2}$ branching fraction
• Precision Measurement of KS Meson Lifetime with the KLOE detector