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Lhcb: Stealth Bosons 4Th Red LHC Workshop (Virtual) (4 – 6 November 2020)

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Lhcb: Stealth Bosons 4Th Red LHC Workshop (Virtual) (4 – 6 November 2020) LHCb: Stealth bosons 4th Red LHC workshop (Virtual) (4 { 6 November 2020) Carlos V´azquezSierra CERN November 5, 2020 Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 1 / 18 The LHCb detector [IJMP A30 (2015) 1530022] LHCb is a 20 5 m GPD in the forward region (upgrade during LS2 { see backup). × Single-arm forward spectrometer (2 < η < 5) along the beamline (z). Tracking and vertexing systems Particle identification systems Side view π± e± VELO µ± TT RICH1 RICH2 Magnet # T1 T2 T3 Excellent vertexing resolution (fast mixing). M1 SPD HCAL Excellent mass resolution (low masses). PS/ECAL M2 M3 M4 M5 Excellent jet reconstruction and tagging capabilities { see backup. Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 2 / 18 The LHCb detector [IJMP A30 (2015) 1530022] LHCb is a 20 5 m GPD in the forward region (upgrade during LS2 { see backup). × Single-arm forward spectrometer (2 < η < 5) along the beamline (z). Tracking and vertexing systems Particle identification systems Side view Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 3 / 18 The LHCb detector [IJMP A30 (2015) 1530022] Hardware level L0: removed for Upgrade Ia (UIa). ! benefit for low mass searches. ! Software level HLT: Topological triggers on DV. ! Down to pT 80 MeV/c (µ). ! ∼ UIa: full event reco (30 MHz). ! benefit for exotic searches. ! Turbo (since 2015) lines: Any event part can be saved. ! Can work directly on them. ! Online µ-ID and jets in turbo. ! GPU-based HLT1 (Allen project) from UIa [Comp Soft Big Sci (2020) 4 7] Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 4 / 18 STEALTH physics @ LHCb [STEALTH physics @ LHCb] workshop (J. Zurita): Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 5 / 18 STEALTH physics @ LHCb [STEALTH physics @ LHCb] workshop (J. Zurita): Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 6 / 18 Dark Photons [PRL (2020) 124 041801] Search for dark photons decaying into a pair of muons: Kinetic mixing of the dark photon (A0) with off-shell photon (γ∗) by a factor ": 1 A0 inherits the production mode mechanisms from γ∗. + + 2 A0 µ µ− can be normalised to γ∗ µ µ−. ! ! 3 No use of MC no systematics from MC. ! Separate γ∗ signal from background and measure its fraction. Prompt-like search (up to 70 GeV/c2) displaced search (214 { 350 MeV/c2). ! A0 is long-lived only if the mixing factor is really small. 1 Used 5.5 fb− of Run 2 LHCb data (13 TeV). Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 7 / 18 Dark Photons [PRL (2020) 124 041801] Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 8 / 18 Dark Photons [PRL (2020) 124 041801] No significant excess found { great sensitivity (especially m > 10GeV and m < 0:5 GeV). Displaced search is also done (small displaced region is excluded) { see backup. 2 ε − 10 5 − 10 6 − 10 7 LHCb LHCb prompt-like A0 search LHCb (2016 data) BaBar+KLOE+CMS − 10 8 1 10 m(A0) [ GeV ] 10−2 A1 HPS APEX (g 2)e LHCb ε − KLOE CMS NA48/2 BaBar KLOE −3 BaBar 10 E774 LHCb NA64 10−4 E141 LHCb KEK − 10 5 Orsay PS191 NOMAD ν-CAL I CHARM E137 10−6 10−2 10−1 1 10 m(A0) [ GeV ] Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 9 / 18 Dark Photons { non-minimal searches [JHEP 10 (2020) 156] Signature sensitive to other models model-independent search: ! Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 10 / 18 Dark Photons { non-minimal searches [JHEP 10 (2020) 156] UL @ 90% C.L. on σ(X µµ) (top: inclusive, bottom: b-associated): ! 2HDM Higgs θH world best limits: LHCb R1 [JHEP! 09 (2018) 147] ! CMS R1 [PRL 109 (2012) 121801] ! CMS R2 [PRL 124, 131802 (2020)] ! Belle Y X γ [PRD 87 (2013) 031102] ! ! Other scenarios covered too (i.e. HV). Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 11 / 18 Dark Photons { the future 0 0 Cover di-electron final states in D∗ D A0(ee) decays: Hardwareless trigger is required (softer! final state than in the di-muon mode), ! High statistics get 3 1011D0 per inverse fb! ! ! × Prospected reach for Run III and beyond: [arXiv:1812.07831] Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 12 / 18 Light dark bosons decaying into µµ [JHEP 09 (2018) 147] Light spin-0 particles copiously produced in gluon-gluon fusion: Many models: NMSSM, 2HDM+S, etc. Recent review on LHC searches: [arXiv:1802.02156] 1 Search using LHCb Run 1 (3 fb− ) published in JHEP. Look for a di-muon resonance from 5.5 to 15 GeV/c2 (also between Υ peaks): Mass-interpolated efficiencies in bins of pT ; η (model independent results also given). Production x-section (8 TeV) limits for a scalar (vector) boson on the left (right). First scalar limits between 8.7 and 11.5 GeV/c2 and competitive with CMS elsewhere. No excess observed for more details ask me during the coffee break ! 20 / 100 , LHCb Υ(1S) 95% CL upper limits LHCb Υ(1S) 95% CL upper limits ) [pb] ) [pb] Υ(2S) Median expected Υ(2S) Median expected √s = 8 TeV µµ √s = 8 TeV µµ Υ(3S) 68% expected 80 Υ(3S) 68% expected 15 → → 95% expected 0 95% expected φ A ( Observed ( Observed CMS expected 60 × B × B ) ) CMS observed 0 φ 10 A → → ¯ q 40 gg q ( ( σ σ 5 20 0 0 6 8 10 12 14 6 8 10 12 14 m(φ) [GeV] m(A0) [GeV] Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 13 / 18 Dark pions decaying into jet pairs [EPJC (2017) 77 812] 0 HV πv decaying to bb¯ { especially with SM-like H πv πv production. ! In most of the cases only one of the two πv decays into the LHCb acceptance. Experimental signature is a single displaced vertex with two associated jets. 1 Limits with partial LHCb Run I (2 fb− ) dataset published (95% C.L. below): 3 ) 10 v π 2 2 v mπ = 25 GeV/c mπ = 50 GeV/c Reconstruct the displaced vertex and v v 2 2 → π mπ = 35 GeV/c mπ = 35 GeV/c , πv → cc̄ v v LHCb 0 2 2 H 2 m = 43 GeV/c m = 35 GeV/c , π → ss̄ find two associated jets. ( 10 πv πv v ⋅ ℬ ) 0 Use πv detachment to discriminate →H SM gg 10 σ/σ between signal and background. ( Background dominated by bb¯ events 1 and material interactions. 10−1 No excess found { next steps: Analyse LHCb Run 2 data for lower 10−2 ! 1 10 102 103 masses/jet substructure. Lifetime [ps] Confining dark showers [PRD 97 ! (2018) 095033]. Exclusive displaced hadronic ! vertices [JHEP 01 (2020) 115]. Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 14 / 18 ( ) + Hidden-sector bosons in B K ∗ χ(µ µ−) ! 0 0 + + B K ∗ χ [PRL 115 (2015) 161802] / B K χ [PRD 95 (2017) 071101 (R)] ! + ! Search for hidden-sector bosons χ µ µ− in b s penguin decays: ! ! Axial-vector portal (χ as axion) [LNP 741 (2008) 3] Scalar (Higgs) portal (χ as inflaton) [JHEP 05 (2010) 10] 0 First dedicated search (K ∗ χ) over such a large mass range: 0 + Pro: K ∗ K π− vertex leads to better τ(χ) resolution and less background. Con: B0 !K 0χ has smaller branching fraction than the B+ K +χ mode. ! ∗ ! Allow for prompt and detached di-muon candidates { up to 1000 ps ( 30 cm). ∼ Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 15 / 18 ( ) + Hidden-sector bosons in B K ∗ χ(µ µ−) ! 1 Full LHCb Run I dataset (3 fb− ) used for both searches. Look for a narrow di-muon peak (mass resolution between 2 and 9 MeV/c2). Exclude narrow QCD resonances [PRL 115 (2015) 161802] MVA selection almost independent of χ mass and decay time (uBoost). BR normalised to (B+ K +J= )( 10 4) or (B0 K 0µ+µ )( 10 7). B ! ∼ − B ! ∗ − ∼ − Constraints on τ(χ) between 0.1 and 1000 ps (left), [PRD 95 (2017) 071101 (R)] Constraints on mixing angle θ2 between the Higgs and χ in the inflaton model (right): No evidence for signal observed. Large fraction of allowed inflaton parameter space ruled out. Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 16 / 18 Conclusions LHCb proved to be very competitive for stealth physics: Excellent vertexing, tracking and soft trigger. Especially competitive for low masses and lifetimes. Rich variety of models and signatures can be approached. Bright prospects for the future: Removal of hardware trigger access softer kinematics. Better vertex resolution and tracking! capabilities. New techniques under development for ideas on new signatures. Many other existing results and proposed studies not covered: LFV Higgs decays [EPJC (2018) 78 1008] Searches for HNLs (produced from B and D meson decays, or from prompt W decays) (existing). LLP µ+jets (existing), ALPs γγ (on-going), True Muonium at LHCb (proposed)! see backup. ! ! White paper on Stealth physics at LHCb in preparation stay tuned! ! We are looking forward to ideas for new signatures and techniques: Do not hesitate to contact us if interested! Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 17 / 18 Thanks for your attention! Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 18 / 18 Backup Carlos V´azquezSierra 4th Red LHC workshop (Virtual) November 5, 2020 19 / 18 The future of LHCb Physics case for an LHCb Upgrade II: Opportunities in flavour physics, and beyond, in the HL-LHC era [CERN-LHCC-2018-027] Challenging conditions { higher rate, pile-up, occupancy and fluence.
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