The LHCb Experiment T Bowcock University of Liverpool

The LHCb Experiment T. Bowcock University of Liverpool For the LHCb Collaboration

Overview Detector Design LHCb Components and Status Physics Summary 9/17/2020 LHCb Detector T. Bowcock 3

Detector Design(1) Goals • • Simultaneous measurements of , , , and Exploration of Bs sector Access to rare b-decays +… 9/17/2020 LHCb Detector T. Bowcock 4

Detector Design(2) h 1 a g 0 0 9/17/2020 LHCb Detector T. Bowcock b r 1 5

Detector Design(3) Forward Physics O(1012)bbpairs/year bb~500 b bb/ inelastic~5× 10 -3 Pairs produced at small angles Modest luminosity 9/17/2020 LHCb Detector T. Bowcock 6

LHCb(1) Components Reversible field 9/17/2020 LHCb Detector T. Bowcock 7

LHCb(2) Particle ID ID 1 -150 Ge. V/c RICH system divided into 2 detectors and 3 radiators: aerogel, C 4 F 10, CF 4 9/17/2020 LHCb Detector T. Bowcock 8

LHCb(3) RICH Acceptance n 300 mrad RICH 1 n 120 mrad RICH 2 Radiators: thickness L, refractive index n, angle c, /K threshold Aerogel C 4 F 10 CF 4 9/17/2020 LHCb Detector T. Bowcock L 5 85 167 cm n 1. 03 1. 0014 1. 0005 c 242 53 32 mrad 0. 6 2. 6 4. 4 Ge. V K 2. 0 9. 3 15. 6 Ge. V 9

LHCb(4) Particle ID 3 separation K 380 Ge. V/c 2 separation K 1150 Ge. V/c # of detected photons n 9/17/2020 7 33 18 Aerogel C 4 F 10 CF 4 LHCb Detector T. Bowcock 10

LHCb(5) Particle ID Bd + ( ) B s D s K ( ) 9/17/2020 LHCb Detector T. Bowcock 11

LHCb(6) Vertexing VELO 9/17/2020 LHCb Detector T. Bowcock 12

LHCb(7) VELO Series of disks 9/17/2020 LHCb Detector T. Bowcock 13

LHCb(8) VELO Micron pn&nn Rad tolerant High resolution n Xs ~ 80 200, 000 channels Low occupancy 9/17/2020 LHCb Detector T. Bowcock 14

LHCb(9) Trigger 9/17/2020 LHCb Detector T. Bowcock 15

LHCb(10) Trigger 9/17/2020 LHCb Detector T. Bowcock 16

LHCb(11) Status LHCb Experiment Approved Sep 1998 Technical Design Reports n n n 9/17/2020 Magnet Calorimeter Muon RICH VELO Outer Tracker LHCb Detector T. Bowcock 17

LHCb(12) Improving Performance Reducing Material Budgets n n n VELO RICH 1 Tracking 0. 19 X 0 0. 04 0. 14 X 0 0. 05 0. 27 X 0 0. 11 Beam Pipe VELO: material, stations RICH: Mirror Tracking Stations Trigger efficiencies 9/17/2020 LHCb Detector T. Bowcock 18

Physics(1) 2005 BABAR, BELLE 9/17/2020 LHCb Detector T. Bowcock 19

Physics(2) LHCb 2007/8 9/17/2020 LHCb Detector T. Bowcock 20

Physics(3) LHCb Performance 9/17/2020 LHCb Detector T. Bowcock 21

Summary Second generation b-physics experiment “day-one” operation Superb instrument for exploring possible deviations from SM in B sector Preparation progressing well 9/17/2020 LHCb Detector T. Bowcock 24