Speaker
Mr
Dongwi Handiipondola Dongwi
(Hampton University)
Description
We are potentially standing at the precipice in the quest for discovery of New Physics (NP) beyond the Standard Model (SM) by performing a precision test of lepton universality. Experiment E36 conducted at J- PARC in Japan is testing lepton universality in the RK = Γ(Ke2)/Γ(Kμ2) ratio. In the SM, the ratio of leptonic K+ decays is highly precise with an uncertainty of δRK /RK = 4 · 10−4. Any observed deviation from the SM prediction would break the universality of the lepton couplings and provide a clear indication of NP beyond the SM. The E36 detector apparatus allows sensitivity to search for sterile neutrinos and light U(1) gauge bosons below 300 MeV/c2, which could be associated with dark matter or explain established muon-related anomalies such as the muon g − 2 value, and perhaps the proton radius puzzle. E36 data taking was completed in 2015. A scintillating fiber target was used to stop a beam of up to 1.2 Million K+ per spill. The K+ decay products were detected with a large-acceptance toroidal spectrometer capable of tracking charged particles with high resolution, combined with a CsI(Tl) photon calorimeter with large solid angle covering about 75% of 4π and particle identification systems. The status of the data analysis will be presented. This work has been supported by DOE Early Career Award DE-SC0003884 and DOE DE-SC0013941.
Primary author
Mr
Dongwi Handiipondola Dongwi
(Hampton University)
Co-authors
Dr
Michael Kohl
(Hampton University)
Dr
Tongtong Cao
(Hampton University)