Measurement of the branching fraction for the decay neutral kaon(long) going to pion-antipion-positron-electron in the high M(pi-pi) invariant mass region

A measurement of the branching fraction for the rare decay K0L → pi+pi-e +e- was performed using data collected from experiment E871 which ran at the AGS of Brookhaven National Laboratory. Analysis of the data revealed 27.7 +/- 7.4 signal events in the signal region, 0.4905 GeV < Mpipiee < 0.505 GeV together with 13.3 +/- 3.7 background events. The branching fractions of ( 8.5+/-2.3stat +/-1.0sys ) x 10-6 using the phenomenological model acceptance and ( 2.3+/-0.6stat +/-0.3sys ) x 10-6 using the chiral perturbation model represent the first measurements for K0L → pi+pi-e +e- in the dipion invariant mass region 0.475 GeV < Mpipi < 0.497 GeV. These results support the prediction of chiral perturbation theory rather than that of the phenomenological model.

Department dc:contributor.department

College of William & Mary - Arts & Sciences

Year dc:date.issued

2007

Author dc:creator

• Moss, Joshua J.

Statement dc:rights

• © The Author

DOI

https://dx.doi.org/doi:10.21220/s2-843x-vn61

OAI record oai:identifier

https://scholarworks.wm.edu/server/oai/request?verb=GetRecord&metadataPrefix=dim&identifier=oai%3Ascholarworks.wm.edu%3Ainternal%2F5617