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Kaon experiments at CERN: recent results and prospects

Author:
Goudzovski, Evgueni   Wrońska, A.   Magiera, A.   Guaraldo, C.   Ströher, H.   


Journal:
EPJ Web of Conferences


Issue Date:
2016


Abstract(summary):

The NA48/2 and NA62-R-K experiments at the CERN SPS collected large samples of charged kaon decays in flight in 2003-07. The data analysis is still on-going (with over 20 publications produced so far); the recent results from these experiments are presented. A new upper limit on the rate of a lepton number violating decay K-+/- -> pi(-/+)mu(+/-)mu(+/-) is reported: B < 8.6 x 10(-11) at 90% CL. Searches for heavy sterile neutrino N-4 and neutral scalar resonances (chi) in K-+/- -> pi mu mu decays are reported. Upper limits on the products B(K +/- -> mu N-+/-(4))B(N-4 -> pi(-/+)mu(+/-)) and B (K-+/- -> pi(+/-)chi)B(chi -> mu(+)mu(-)) are set in the range 10(-10) to 10(-9) for resonance lifetimes up to 100 ps. A preliminary measurement of the electromagnetic transition form factor slope of the pi(0) from 1.05 x 10(6) fully reconstructed pi(0) -> gamma e(+)e(-) decays is presented: the obtained result a =3D (3.70 +/- 0.53(stat) +/- 0.36(syst)) x 10(-2) represents the first observation of a non-zero slope in the time-like region of momentum transfer.


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