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- W4313404141 abstract "We explore some aspects of $Sp(4)$ gauge theory with two fundamental fermions in the context of composite Goldstone Dark Matter. We present preliminary lattice results for the mass of the pseudoscalar iso-singlet meson $eta'$ using unimproved Wilson fermions and the standard plaquette action. We find that the $eta'$ is slightly heavier than the pseudoscalar non-singlets $pi$ and lighter than the vector mesons $rho$ for multiple ensembles with $m_pi/m_rho geq 0.77$. This pattern is potentially relevant for Beyond the Standard Model physics model building. Furthermore, we show that for $N_f=1+1$ flavours the disconnected contributions to the unflavoured pseudoscalar $pi^0$ are small. We supplement this measurement by a calculation of the $pipi$ scattering length $a_0$ which shows that the ensemble studied might be phenomenologically relevant for Dark Matter models such as the Strongly Interacting Massive Particles paradigm." @default.
- W4313404141 created "2023-01-06" @default.
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- W4313404141 date "2022-12-19" @default.
- W4313404141 modified "2023-10-14" @default.
- W4313404141 title "Singlet Mesons in Dark $Sp(4)$ Theories" @default.
- W4313404141 doi "https://doi.org/10.22323/1.430.0225" @default.
- W4313404141 hasPublicationYear "2022" @default.
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