Searching for X17: First Results from the PADME Experiment

Speaker: 
Andre Frankenthal
Institution: 
University of California, Irvine
Date: 
Wednesday, April 30, 2025
Time: 
11:00 am
Location: 
NSII 1201

Abstract: The PADME experiment is a fixed-target high-energy physics setup based in Frascati, Italy, originally designed to search for dark photon production via collisions between a positron beam and a thin carbon target. In 2022, the experiment was adapted for a timely search for the X17 particle—a hypothetical boson with a mass around 17 MeV—motivated by anomalies observed in nuclear transitions by the ATOMKI group in Hungary. We present preliminary results from this first dedicated X17 search, which show a mild excess of events near the expected 17 MeV center-of-mass energy. This talk will cover the experimental setup, the theoretical motivation for X17, details of the observed data, and future plans for data taking aimed at either confirming or refuting the existence of the X17 particle.

Host: 
Yuri Shirman