Measurement of structure dependent radiative K+ → e+νγ decays using stopped positive kaons

Search for Light Neutral Bosons in the TREK/E36 Experiment at J-PARC

“…alies in astrophysics and g the Standard Model of ional Uð1Þ D gauge group gauge boson A 0 (''dark ss range [4][5][6] motivated well as in experimental [15], where new physics ssible explanation of the he constraints from rare he present work, we will nd constraints on the A 0 electromagnetic current a QED-like vertex term g parameter describing ctromagnetic current by 4 [9]. udy the process K þ !…”

“…The possibility to explain anomalies in astrophysics and particle physics [1][2][3] by extending the Standard Model of particle physics (SM) by an additional Uð1Þ D gauge group manifesting itself in a massive gauge boson A 0 (''dark photon'') in the MeV to GeV mass range [4][5][6] motivated a strong activity in theoretical as well as in experimental physics [7][8][9][10][11][12][13][14][15][16]. In a recent work [15], where new physics scenarios were explored as a possible explanation of the proton charge radius problem, the constraints from rare kaon decays were examined. In the present work, we will use these rare kaon decays to find constraints on the A 0 parameters.…”

“…Details of the experimental method and detector configuration have been described in Ref. [15]. The radiative photons from K SD e2γ(γ) were detected by GSC.…”

Measurement of structure dependent radiative K+ → e+νγ decay at J-PARC

“…Details of the experimental methods, detector configuration, and analysis procedure have been described in Ref. [5]. The K e2 and K µ2 events with momentum of 247 and 236 MeV/c, respectively, were analyzed by the toroidal spectrometer.…”