论文标题
$η^{（\ prime）} \toπ^{0}γγ$和$η^{\ prime} \toηγγ$衰减到Sub-Gev leptophobic $ u（1）_ {b} $ boson
Sensitivity of the $η^{(\prime)}\toπ^{0}γγ$ and $η^{\prime}\toηγγ$ decays to a sub-GeV leptophobic $U(1)_{B}$ boson
论文作者
论文摘要
罕见衰减的敏感性$η^{（\ prime）} \toπ^{0}γγ$和$η^{\ prime} \ toηγ$ toηγ$ to leptophobic $ b $ b $ boson在MEV-GEV群众中的签名。通过添加明显的$ b $ -boson共振交换，$η\ tobγ\toπ^{0}γγ$，从矢量和标量梅森交换的标准模型贡献中，并为相关的分支比率采用实验数据，它允许我们对$ b $ boson $ -boson $ -boson Mass $ pl $ m__} $} $} $}的当前约束; $α_{b} $。从这些约束以及对可用实验性$γγ$不变质量分布的分析中，我们表明a $ b $ -boson签名在谐振质量范围内$ m_ {π^{0}} \ simsim m_ {b} \ lyssim m_ {b} \ sillsimm_η$很难在实验中，并且bos $ bos $ bos $ bos $ bos bos bos bobs b byopp b byopp byopp byopp byopp opp oppoff byopp oppoff颗粒。相比之下，此质量窗口以外的限制不那么严格，并且相应的$ t $ - $ u $ - 通道签名仍可以在数据中观察到，因为它发生在非谐波标准型号$ρ$，$ω$和$ ϕ $ n ϕ $ MESON交流中。此外，我们利用来自$η^{\ prime} \toπ^{0}γγ$和$η^{\ prime} \ toηγ$衰变的实验数据，以探索较大的$ b $ boson块。我们的结果与现有和即将推出的Light-Meson设施的$ B $ -BOSON搜索程序有关，例如Kloe（-II）和Jefferson Lab ETA工厂实验。
The sensitivity of the rare decays $η^{(\prime)}\toπ^{0}γγ$ and $η^{\prime}\toηγγ$ 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, $η\to Bγ\toπ^{0}γγ$, 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 $α_{B}$. From these constraints and the analysis of the available experimental $γγ$ invariant mass distribution, we show that a $B$-boson signature in the resonant mass range $m_{π^{0}}\lesssim m_{B}\lesssim m_η$ 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 $ρ$, $ω$ and $ϕ$ meson exchanges. In addition, we make use of experimental data from the $η^{\prime}\toπ^{0}γγ$ and $η^{\prime}\toηγγ$ 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.
