1. Gloria Corti, LHCb LHCb background on detector

2. Gloria Corti Page 2 Evaluating impact on experiment Increasing the inner coverage of the TT detector will improve considerably the tracking between the VeLo and the Tracking Station after the magnet, having another tracking segment between both! Existing TT square Hole 2.81 cm TT inner radius With existing beam pipe

3. Gloria Corti Page 3 Backgrounds Amount of particle from collisions crossing the beam pipe walls depends on its radius Today input on aperture for both LHC and HL- LHC Background from beam-gas Today input Inclusive b Minimum bias

4. Gloria Corti Impact of Background To evaluate how the increased level of background affects the experiment measurements requires complete simulation studies where the new beam pipe is introduced. Occupancy vs. detector granularity ‘realistic layout’ keeping massive element as far as possible from beam line 15 0 window ? ✕ ✓