Speaker
Yorito Yamaguchi
(University of Tokyo)
Description
A dark photon is a hypothetical particle which is very weakly coupled
with ordinary photons in some Beyond the Standard Model (BSM)
theories. The dark photon is a candidate for the annihilation of dark
matter particles into $e^+e^-$ pairs, a process which could provide an
explanation for the positron excess in the universe observed by
several satellite experiments. It may also explain the $3\sigma$
discrepancy between the muon $g-2$ result and Standard Model
calculations. The PHENIX experiment at RHIC has excellent
capabilities for electron identification and for measuring $e^+e^-$
pairs with a very good mass resolution, making possible a search for
such pairs from dark photon decay. We have conducted a search for
possible $e^+e^-$ pairs from dark photons among a large data sample of
pairs from $\pi^0$ Dalitz decays. We present new results of the dark
photon search from the PHENIX experiment, which provide the world's
best limits and rules out a majority of the mass-branching ratio
region that could explain the $g-2$ result.
| On behalf of collaboration: | PHENIX |
|---|
Author
Dr
Dave Morrison
(Brookhaven National Laboratory)
