Long Lived Particles in LHCb Upgrade II Elena Dall’Occo on behalf of the LHCb collaboration HL/HE LHC Meeting Fermilab 04-06/04/2018
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LLPs at LHCb • calibration + reconstruction in real time • very soft triggers: at software level (HLT): at hardware level (L0): • topological triggers on detached vertices • muons with p T > 1.5 GeV • PID and jets in trigger • calo deposits with E T > 3 GeV • excellent for light dimuons see Mike’s (prompt and detached) talk new µµ turbo trigger with online muon id requirement (no pre-scale) Phys. Rev. Lett. 120, 061801 (2018) Candidates / σ [ m ( µµ )]/ 2 7 prompt-like sample 10 LHCb p T ( µ ) > 1 GeV, p ( µ ) > 20 GeV √ s = 13 TeV 6 10 µ + µ − 5 10 µ ± µ ± 4 10 3 10 2 10 3 5 4 10 10 10 m ( µµ ) [ MeV ] Many searches for LLPs performed and ongoing! 3 Elena Dall’Occo HL/HE LHC - 04/04/2018
LHCb Upgrades ~1 visible ~5 visible interactions interactions LHCb LHCb Upgrade I LHCb Upgrade I LHCb Run 2 Run 3 Run 4 LS3 LS2 EYETS L int ~ 8 fb -1 L = 2 x 10 33 L int ~ 50 fb -1 HL-LHC Installation,ATLAS/ Injector upgrades CMS Phase 2 upgrades 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2030 2028 2028 LHCb Upgrade I LHCb Upgrade I(b): Incremental LHCb Upgrade I LHCb Upgrade I(b): incremental Installation starts improvements/prototype detectors installation starts improvements/prototype detectors Upgrade I • no hardware trigger, full software trigger with readout of the full event at 40 MHz • improved vertex resolution • momentum resolution of the tracking system ~10-20% better • reduced ghost rate will extend LHCb reach for LLPs! 4 Elena Dall’Occo HL/HE LHC - 04/04/2018
LHCb Upgrades ~1 visible ~5 visible interactions interactions LHCb LHCb Upgrade I LHCb Upgrade I LHCb Run 2 Run 3 Run 4 LS3 LS2 EYETS L int ~ 8 fb -1 L = 2 x 10 33 L int ~ 50 fb -1 HL-LHC Installation,ATLAS/ Injector upgrades CMS Phase 2 upgrades 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2030 2028 2028 LHCb Upgrade I LHCb Upgrade I(b): Incremental LHCb Upgrade I LHCb Upgrade I(b): incremental Installation starts improvements/prototype detectors installation starts improvements/prototype detectors ~50 visible interactions LHCb Upgrade II LHCb Upgrade II Upgrade II (wrt Upgrade I) LHCb Upgrade II Run 5 Run 6 Run 4 and Run 5 • 10x higher vertex multiplicity LS5 L = 1-2 x 10 34 2030 ++ LS4 L int ~ 300 fb -1 • 10x higher particle multiplicity Accumulate 300 fb -1 2040 2030 2031 2032 2033 2034 2035 Pixel timing mandatory • 10x higher radiation damage 5 Elena Dall’Occo HL/HE LHC - 04/04/2018
Detector improvements for LLPs? 6 Elena Dall’Occo HL/HE LHC - 04/04/2018
LHCb Upgrade II CERN-LHCC-2017-003 inner/middle/ outer tracker magnet timing plane side stations How LHCb might look like… (TORCH) • silicon and scintillating fibres UT micro based tracking detectors strips • new sub-detectors (magnet stations, TORCH) • high granularity ECAL with extended dynamic range • HCAL removed see Matt’s talk tomorrow VELO pixels Tracking system and trigger crucial for LLP searches! 7 Elena Dall’Occo HL/HE LHC - 04/04/2018
VELO VELO plays a fundamental role in LLP searches: • reconstruction of primary and secondary in upgrade II pixel timing vertices becomes essential to reduce vertex mis-association in the • part of the tracking system high pile up environment! • decay length accessible by LHCb ~20 cm (decay in the VELO) single PV two PVs two PVs + timing t 0 , t 0 + Δ t t 0 t 0 + Δ t e + mary mary ces: x: ambiguous clear unambiguous unambiguous ambiguous clear flight distance assignment flight distance flight distance flight distance assignment 8 Elena Dall’Occo HL/HE LHC - 04/04/2018
VELO Material CERN-LHCb-DP-2018-002 • the removal of the RF foil is under RF box at ~5 mm from the beam: study for upgrade II • < 5 mm: background dominated • it would reduce the background by heavy flavour and improve the IP resolution • > 5 mm: background mainly from • if not feasible it is crucial to veto material interaction the material interactions… …a material map of the VELO is essential to reduce the background in LLP searches! [mm] • beam-gas (helium) collisions 3 10 20 r (signed) • material interaction along the full 10 2 10 length of the VELO LHCb 0 • secondary interactions of hadrons − 10 10 used to map the material − 20 1 − 500 0 500 1000 [mm] z • analysis performed for Run1 and Run2 • method already applied successfully on a LLP analysis …repeat for next runs? (Phys. Rev. Lett. 120, 061801 (2018)) 9 Elena Dall’Occo HL/HE LHC - 04/04/2018
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