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

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Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties. / The NA48/2 Collaboration ; Ruggiero, Giuseppe.
In: Journal of High Energy Physics, Vol. 2014, No. 159, 18.06.2014.

Research output: Contribution to Journal/Magazine › Journal article › peer-review

Harvard

The NA48/2 Collaboration & Ruggiero, G 2014, 'Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties', Journal of High Energy Physics, vol. 2014, no. 159. https://doi.org/10.1007/JHEP08(2014)159

APA

The NA48/2 Collaboration, & Ruggiero, G. (2014). Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties. Journal of High Energy Physics, 2014(159). https://doi.org/10.1007/JHEP08(2014)159

Vancouver

The NA48/2 Collaboration, Ruggiero G. Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties. Journal of High Energy Physics. 2014 Jun 18;2014(159). doi: 10.1007/JHEP08(2014)159

Author

The NA48/2 Collaboration ; Ruggiero, Giuseppe. / Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties. In: Journal of High Energy Physics. 2014 ; Vol. 2014, No. 159.

Bibtex

@article{105e772e32314e41b576393cbb062d7f,
title = "Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties",
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.",
keywords = "hep-ex, hep-ph",
author = "{The NA48/2 Collaboration} and Giuseppe Ruggiero",
year = "2014",
month = jun,
day = "18",
doi = "10.1007/JHEP08(2014)159",
language = "English",
volume = "2014",
journal = "Journal of High Energy Physics",
issn = "1029-8479",
publisher = "Springer-Verlag",
number = "159",

}

RIS

TY - JOUR

T1 - Detailed study of the K ± → π 0 π 0 e ± ν (K e4 00 ) decay properties

AU - The NA48/2 Collaboration

AU - Ruggiero, Giuseppe

PY - 2014/6/18

Y1 - 2014/6/18

N2 - 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.

AB - 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.

KW - hep-ex

KW - hep-ph

U2 - 10.1007/JHEP08(2014)159

DO - 10.1007/JHEP08(2014)159

M3 - Journal article

VL - 2014

JO - Journal of High Energy Physics

JF - Journal of High Energy Physics

SN - 1029-8479

IS - 159

ER -