LHCb Mockup
LHCb does not resemble a modern 4pi general purpose particle detector, but rather looks a bit like an old-fashioned spectrometer like was used at fixed target experiments (to be clear, LHCb is not a fixed target experiment). Collisions happen to the left of the detector, and the collision products are analyzed by the detectors to the right. Since the LHC energy is much higher than what is needed to make B mesons, LHCb doesn't lose anything by "giving up" the collision energy available in central collisions.
LHCb Mockup
LHCb does not resemble a modern 4pi general purpose particle detector, but rather looks a bit like an old-fashioned spectrometer like was used at fixed target experiments (to be clear, LHCb is not a fixed target experiment). Collisions happen to the left of the detector, and the collision products are analyzed by the detectors to the right. Since the LHC energy is much higher than what is needed to make B mesons, LHCb doesn't lose anything by "giving up" the collision energy available in central collisions.