IPM Calendar 
Tuesday 14 July 2020   Today  
Events for day: Monday 16 December 2019    
           11:00 - 12:00     Journal Club: Experiment & Phenomenology
The existing evidence for the hypothetical X17 particle

School
PARTICLES AND ACCELERATORS

Based on: 1910.10459[nucl-ex]
1604.07411[hep-ph]


Abstract: A series of experiments at Atomki Institute lead by Krasznakorkay suggest the existence of a new gauge boson with a mass of about 17 MeV (X17). These experiments which study the nuclear transition of excited 8Be and 4He to their ground states plus an electron-positron pair, show an excess of events in the opening angle and the invariant masses of the electron-positron, which can be explained very nicely with the help of X17. In this talk, we will discuss these experiments, and how a new gauge boson with mass 17 MeV can fit the data. We wil ...