Please visit Jefferson Lab Event Policies and Guidance before planning your next event: https://www.jlab.org/conference_planning.

Sep 5 – 9, 2022
online
US/Eastern timezone
Thank you to all the participants for a great QNP2022!

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

Sep 9, 2022, 9:45 AM
20m
online

online

FSU, Tallahassee, FL, USA

Speaker

Rafel Escribano

Description

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 analysed 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 meson dominance and the linear sigma model, and employing experimental data for the associated branching ratios, 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 $m_{\gamma\gamma}^{2}$ 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 $B$ boson only decays to %visible,
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 non-resonant, Standard Model, $\rho,\omega$ and $\phi$ meson exchanges. % contributions.
In addition, we employ 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 programmes at existing and forthcoming light-meson facilities, such as KLOE(-II) and Jefferson Lab Eta Factory experiments.

speaker affiliation Universitat Autònoma de Barcelona and IFAE

Primary author

Co-authors

Sergi Gonzàlez-Solís (Los Alamos National Laboratory) Emilio Royo (Universitat Autònoma de Barcelona and IFAE)

Presentation materials