Jun 5 – 9, 2023
Genova, Italy
Europe/Rome timezone

Sensitivity of the η(′) → π0γγ and η′ → ηγγ decays to a sub-GeV leptophobic U(1)B boson

Jun 7, 2023, 3:00 PM
DAD - Room 0B (Genova, Italy)

DAD - Room 0B

Genova, Italy

Contributed Hadrons and physics beyond the standard model Hadrons and physics beyond the standard model


Sergi Gonzalez-Solis (Los Alamos National Lab)


The sensitivity of the rare decays $\eta^{(\prime)}\to\pi^{0}\gamma\gamma$ and $\eta^{\prime}\to\eta\gamma\gamma$ to signatures of a leptophobic $B$ boson in the MeV-GeV mass range is analyzed in this work.
By adding an explicit $B$-boson resonance exchange, $\eta\to B\gamma\to\pi^{0}\gamma\gamma$, to the Standard Model contributions from vector and scalar meson exchanges,and employing experimental data for the associated branching ratios,it allows us to improve the current constraints on the $B$-boson mass $m_{B}$ and coupling to Standard Model particles $\alpha_{B}$.
From these constraints and the analysis of the available experimental $\gamma\gamma$ invariant mass distribution, we show that a $B$-boson signature in the resonant mass range $m_{\pi^{0}}\leq m_{B}\leq m_{\eta}$ is strongly suppressed and would be very difficult to experimentally identify, assuming that the leptophobic $B$ boson only decays to Standard Model particles.
In contrast, the limits outside this mass window are less stringent and the corresponding $t$- and $u$-channel signatures may still be observable in the data, as it occurs with the nonresonant Standard Model $\rho$, $\omega$ and $\phi$ meson exchanges.
In addition, we make use of experimental data from the $\eta^{\prime}\to\pi^{0}\gamma\gamma$ and $\eta^{\prime}\to\eta\gamma\gamma$ decays to explore larger $B$-boson masses.
Our results are relevant for the $B$-boson search programs at existing and forthcoming light-meson facilities, such as KLOE(-II) and Jefferson Lab Eta Factory experiments.

Primary author

Rafel Escribano (Universitat Autònoma de Barcelona)


Emilio Royo (Universitat Autònoma de Barcelona) Sergi Gonzalez-Solis (Los Alamos National Lab)

Presentation materials

Peer reviewing