Speaker
Misa Toman
Description
The ForwArd Search ExpeRiment (FASER) searches for dark photons that are produced in the decays of neutral pions and eta mesons and decay into fermion-antifermion pairs. Dark photons are massive gauge bosons of broken $U(1)_D$ symmetry, presenting a remarkably simple extension to the standard model. Previous analyses have neglected spin correlations in signal event generation; however, because the dark photon has non-zero spin, such spin correlations exist. We analytically calculate the cross-section for these decays within the narrow-width approximation, and compare the results with and without spin correlations. We find that spin correlations are not a significant effect on existing dark photon searches.
Authors
Eli Marcel Welch
(University of California Irvine (US))
Jonathan Lee Feng
(University of California Irvine (US))
Misa Toman
