MESON2026

Leptophobic $B$-boson searches with $\eta\to\pi^{0}\gamma\gamma$ and $\phi\to\pi^{0}\eta\gamma$ decays

27 Jun 2026, 12:30

20m

Medium lecture hall (B) (Auditorium Maximum)

Parallel Tests of fundamental symmetries and precision experiments Parallel session B5

Speaker

Rafel Escribano (Autonomous University of Barcelona)

Description

The possibility for the existence of a leptophobic $U(1)$ gauge boson associated to baryon symmetry is scrutinized in the MeV-GeV mass range by means of an exhaustive analysis of the corresponding golden channels $\eta\to\pi^{0}\gamma\gamma$ and $\phi\to\pi^{0}\eta\gamma$.
Using the latest experimental data on these two processes and taking also into account the Standard Model contributions from scalar and vector meson exchanges, we are able to obtain the best $95\%$ exclusion limits up to date for the mass $m_{B}$ and coupling $\alpha_{B}$ to known particles of this hypothetical $B$ boson.