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

, The NA48/2 Collaboration and Ruggiero, Giuseppe (2014) Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties. Journal of High Energy Physics, 2014 (159). ISSN 1029-8479

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Abstract

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.

Item Type:
Journal Article
Journal or Publication Title:
Journal of High Energy Physics
Uncontrolled Keywords:
/dk/atira/pure/subjectarea/asjc/3100/3106
Subjects:
ID Code:
133611
Deposited By:
Deposited On:
21 May 2019 10:15
Refereed?:
Yes
Published?:
Published
Last Modified:
01 Jan 2020 11:59