Detailed study of the K± → π0π0e±ν (Ke400) decay properties

被引：8

作者：

Batley, J. R. ^{[1
]}

Kalmus, G. ^{[1
]}

Lazzeroni, C. ^{[1
]}

Munday, D. J. ^{[1
]}

Slater, M. W. ^{[1
]}

Wotton, S. A. ^{[1
]}

Arcidiacono, R. ^{[2
]}

Bocquet, G. ^{[2
]}

Cabibbo, N. ^{[2
]}

Ceccucci, A. ^{[2
]}

Cundy, D. ^{[2
]}

Falaleev, V. ^{[2
]}

Fidecaro, M. ^{[2
]}

Gatignon, L. ^{[2
]}

Gonidec, A. ^{[2
]}

Kubischta, W. ^{[2
]}

Norton, A. ^{[2
]}

Maier, A. ^{[2
]}

Patel, M. ^{[2
]}

Peters, A. ^{[2
]}

Balev, S. ^{[3
]}

Frabetti, P. L. ^{[3
]}

Gersabeck, E. ^{[3
]}

Goudzovski, E. ^{[3
]}

Hristov, P. ^{[3
]}

Kekelidze, V. ^{[3
]}

Kozhuharov, V. ^{[3
]}

Litov, L. ^{[3
]}

Madigozhin, D. ^{[3
]}

Molokanova, N. ^{[3
]}

Polenkevich, I. ^{[3
]}

Potrebenikov, Yu. ^{[3
]}

Stoynev, S. ^{[3
]}

Zinchenko, A. ^{[3
]}

Monnier, E. ^{[4
]}

Swallow, E. ^{[4
]}

Winston, R. ^{[4
]}

Rubin, P. ^{[5
]}

Walker, A. ^{[5
]}

Baldini, W. ^{[6
,7
]}

Ramusino, A. Cotta ^{[6
,7
]}

Dalpiaz, P. ^{[6
,7
]}

Damiani, C. ^{[6
,7
]}

Fiorini, M. ^{[6
,7
]}

Gianoli, A. ^{[6
,7
]}

Martini, M. ^{[6
,7
]}

Petrucci, F. ^{[6
,7
]}

Savrie, M. ^{[6
,7
]}

Scarpa, M. ^{[6
,7
]}

Wahl, H. ^{[6
,7
]}

机构：

[1] Univ Cambridge, Cavendish Lab, Cambridge CB3 0HE, England

[2] CERN, CH-1211 Geneva 23, Switzerland

[3] Joint Inst Nucl Res, Dubna 141980, MO, Russia

[4] Univ Chicago, Enrico Fermi Inst, Chicago, IL 60126 USA

[5] Univ Edinburgh, Dept Phys & Astron, Edinburgh EH9 3JZ, Midlothian, Scotland

[6] Univ Ferrara, Dipartimento Fis & Sci Terra, I-44122 Ferrara, Italy

[7] Sez INFN Ferrara, I-44122 Ferrara, Italy

[8] Sez INFN Firenze, I-50019 Sesto Fiorentino, Italy

[9] Univ Florence, Dipartimento Fis, I-50125 Sesto Fiorentino, Italy

[10] Sez INFN Firenze, I-50125 Sesto Fiorentino, Italy

[11] Johannes Gutenberg Univ Mainz, Inst Phys, D-55099 Mainz, Germany

[12] Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA

[13] Sez INFN Perugia, I-06100 Perugia, Italy

[14] Univ Perugia, Dipartimento Fis, I-06100 Perugia, Italy

[15] Sez INFN Perugia, I-06100 Perugia, Italy

[16] Sez INFN Pisa, I-56100 Pisa, Italy

[17] Scuola Normale Super Pisa, I-56100 Pisa, Italy

[18] Sez INFN Pisa, I-56100 Pisa, Italy

[19] Univ Pisa, Dipartimento Fis, I-56100 Pisa, Italy

[20] CEA Saclay, DSM IRFU, F-91191 Gif Sur Yvette, France

[21] Univ Siegen, Fachbereich Phys, D-57068 Siegen, Germany

[22] Sez INFN Torino, I-10125 Turin, Italy

[23] Univ Turin, Dipartimento Fis, I-10125 Turin, Italy

[24] Austrian Acad Sci, Inst Hochenergiephys, A-10560 Vienna, Austria

[25] Univ Modena & Reggio Emilia, Dipartimento Fis, I-41125 Modena, Italy

[26] Univ Urbino, Ist Fis, I-61029 Urbino, Italy

来源：

JOURNAL OF HIGH ENERGY PHYSICS | 2014年 / 08期

关键词：

Rare decay; Branching fraction; Fixed target experiments; Flavor physics; RADIATIVE-CORRECTIONS; LOW-ENERGY; KE4; RATIO;

D O I：

10.1007/JHEP08(2014)159

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

A sample of 65210 K-+/- -> pi(0) pi(0)e(+/-)nu (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-pi pi(2), M-e nu(2)) and brings evidence for a cusp-like structure in the distribution of the squared pi(0)pi(0) invariant mass around . Exploiting a model independent description of this form factor, the branching ratio, inclusive of radiative decays, is obtained using the K-+/- -> pi(0)pi(0)pi(+/-) decay mode as normalization. It is measured to be BR(K-e4(00)) = (2.552 +/- 0.010(stat) +/- 0.010(syst) +/- 0.032(ext)) x 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 pi(+)pi(-) pair (K-e4(+-)) is also presented.

引用

页数：35

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