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Shimizu, S.; Horie, K.; Aliev, M.; Asano, Y.; Baker, T.; Depommier, P.; Hasinoff, M.; Igarashi, Y.; Imazato, J.; Khabibullin, M.; Khotjantsev, A.; Kudenko, Y.; Levchenko, A. S.; Lim, G. Y.; Macdonald, J. A.; Mineev, O.; Rangacharyulu, C.; Sawada, S.

doi:10.1103/physrevd.70.037101

Cited by 7 publications

(1 citation statement)

References 23 publications

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“…At that time, in the framework of current algebra and under the assumption of a unique and constant form factor F [8], the K 00 e4 decay rate and form factor values were related by Γ = (0.75 ± 0.05) |V us • F | 2 10 3 s −1 . In 2004, the E470 experiment at KEK [9] reported an observation of 214 candidates in a study of stopped kaon decays in an active target. Due to a very low geometrical acceptance and large systematics, the partial rate measurement did not reflect the gain in statistics and was not included in the most recent world averages of the Particle Data Group [10], BR = (2.2 ± 0.4) × 10 −5 , unchanged since the 1990's, corresponding to the model dependent form factor value |V us • F | = 1.54 ± 0.15.…”

Section: Introductionmentioning

confidence: 99%

Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties

Batley¹,

Kalmus²,

Lazzeroni³

et al. 2014

J. High Energ. Phys.

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A sample of 65210 K ± → π 0 π 0 e ± ν (K e4 00 ) decay candidates with 1% background contamination has been collected in 2003-2004 by the NA48/2 collaboration at the CERN SPS. A study of the differential rate provides the first measurement of the hadronic form factor variation in the plane (M ππ 2 , M eν 2 ) and brings evidence for a cusp-like structure in the distribution of the squared π 0 π 0 invariant mass around 4m2π+ . Exploiting a model independent description of this form factor, the branching ratio, inclusive of radiative decays, is obtained using the K ± → π 0 π 0 π ± decay mode as normalization. It is measured to be BR(K e4 00 ) = (2.552 ± 0.010stat ± 0.010syst ± 0.032ext) × 10−5, which improves the current world average precision by an order of magnitude while the 1.4% relative precision is dominated by the external uncertainty from the normalization mode. A comparison with the properties of the corresponding mode involving a π + π − pair (K e4 + − ) is also presented

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Section: Introductionmentioning

confidence: 99%