Description
A second major upgrade of the LHCb detector is necessary to allow full exploitation of the HL-LHC for flavour physics. The new detector will be installed during long shutdown 4 (LS4), and will operate at instantaneous luminosity up to $1.5 \times 10^{34}\,{\rm cm}^{−2} {\rm s}^{−1}$. By upgrading all subsystems and adding new detection capability it will be possible to accumulate a sample corresponding to an integrated luminosity of at least $300\,{\rm fb}^{−1}$ of high energy $pp$ collision data, giving unprecedented and unique scientific opportunities in flavour physics, in electroweak physics, in searches for new feebly interacting particles and in hadron spectroscopy. In this document, the potential of the LHCb Upgrade II detector to enable major discoveries through increased sensitivity to a range of as-yet unknown phenomena is summarised.
