Feebly coupled Dark Matter and long-lived particles at the LHC - PowerPoint PPT Presentation

Feebly coupled Dark Matter and long-lived particles at the LHC Alberto Mariotti HEP@ Based on: JHEP 1809 037 with Lorenzo Calibbi, Laura Lopez Honorez, Steven Lowette arXiv:1904.07513 with Sam Junius and Laura Lopez Honorez DESY Theory Seminar 6 May 2019

2 Beyond Standard Model Physics Many fundamental questions still open … ? m e l b o Dark matter nature? r p y h c r a r e i H Force Unification ? Flavour hierarchies ? ? n o i t a fl B n a r y o I g e n e s i s ? ? Where do we go ? Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

3 Beyond Standard Model Physics Many fundamental questions still open … ? m e l b o Dark matter nature? r p y h c r a r e i H Force Unification ? Flavour hierarchies ? ? n o i t a fl B n a r y o I g e n e s i s ? ? Where do we go ? Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

4 Particle Dark Matter Assume Dark Matter is a new elementary particle Simplified models of Dark Matter Useful framework for pheno studies Portal Dark Sector Typically inspired by the WIMP miracle Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

5 WIMP miracle Dark Matter abundance through freeze-out (FO) mechanism ✦ Dark Matter annihilates into Standard Model Particles ✦ Dark Matter abundance freeze-out during cooling of universe Y (= comoving number density) 10 -4 ! ' SM DM 10 -6 ! & 10 -8 ! ( [Bernal et al . 2017] 10 -10 ! $! DM SM 10 -12 ! $% Portal 10 -14 ! $' � interaction Y eq 10 -16 ! $& !"! !"# $"! $"# %"! %"# 1 10 100 Typical weak coupling m/T Independent on cross section 100GeV ⇥ 0 . 2pb m DM initial conditions Ω h 2 ⇠ 0 . 12 ⇥ h σ v i !!! Correct abundance for weakly interacting massive particle !!! Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

6 Probing DM at experiments WIMP-like DM is prototype of DM simplified models e.g. Neutralino dark matter in SUSY 1 Fermi Satellite 2 IceCube Three-fold way 3 Large Hadron Collider Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

7 WIMP under pressure MonoJet signature Limits on WIMP DM are improving continuosly Strong limits from XENON1T Dark Matter Mediator arXiv:1712.02345 LHC results Very sensitive in 5-1000 GeV DM mass range Mediator search Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

8 Dark Matter ZOO But possibility for Dark Matter are much vaster Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

9 Feeble coupled DM Q: Why? ✦ Evade Direct and Indirect Detection ✦ Can be tested @ LHC with exotic signatures (long lived particles (LLP), displaced vertices ...) ✦ Explore the unexplored! Freeze-In DM and displaced signatures @ LHC In this talk: Co-annihilation Freeze-Out and LLP @ LHC Pragmatic Approach: Simplified models to draw lessons about interplay of DM production mechanism and experimental signatures A window into the cosmological history? Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

10 LongLived Signatures @ LHC disappearing or displaced kinked tracks multitrack vertices non-pointing (converted) photons [Figure from Heather Russell] e r a t s p y m a displaced leptons, c o emerging jets e r p lepton-jets, or d y M l lepton pairs l S a c i p y t trackless, low-EMF jets quasi-stable s c charged particles i h s y t multitrack vertices in the i h w P d muon spectrometer s n w e u r e o u N r t g a k n c g a i s b w o l 9 24 April 2017 eather Russell, McGill University Challenging but powerful LLP WG report: arXiv:1903.04497 Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

11 Dark Matter and Long-lived signatures What are DM models with long-lived signatures? Some explored cases .... ✴ FIMP Hall, Jedamzik, March-Russell, West '09 Co, D'Eramo, Hall, Pappadopulo '15 Typically non thermal ✴ SuperWIMP Feng, Rajaraman, Takayama '03 production Chang, Luty '09 ✴ Asymmetric DM Kaplan, Luty, Zurek '09 Schwaller, Stolarski, Weiler '15 ✴ Pseudo-Dirac DM Davoli, De Simone, Jacques, Sanz '17 ✴ Conversion driven FO (co-annihilation) Garny, Heisig, Lülf, Vogl '17 ............................ Hall, March-Russell , West '10 Schwaller, Stolarski, Weiler '15 Hessler, Ibarra, Molinaro, Vogl '16 Buchmueller, De Roeck, McCullough, Hahn, Sung, Schwaller, Yu '17 Stolarski '17 D'Agnolo, Mondino, Ruderman, Wang '18, Ghosh, Mondal, Mukhopadhyaya '18 Davoli, De Simone, Jacques, Morandini '18 D’Eramo, Fernandez, Profumo '18 Garny, Heisig, Hufnagel, Lülf '18 Garny, Heisig '18 Aboubrahim, Nath '19 Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

12 Feeble coupled DM Freeze-In DM and displaced signatures @ LHC In this talk: Co-annihilation Freeze-Out and LLP @ LHC Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

13 Freeze In Dark Matter ✦ Dark matter not in thermal equilibrium with SM bath ✦ Produced via decay or scattering of particles in thermal equilibrium Hall, Jedamzik, March-Russell, West '09 Blennow, Fernandez-Martinez, Zaldivar '13 Bernal, Heikinheimo, Tenkanen, Tuominen, Vaskonen '17 Co, D'Eramo, Hall, Pappadopulo '15 Bélanger, Cai, Desai, Goudelis, Harz, Lessa, J.No, Pukhov, Sekmen, Sengupta, Zaldivar, Zurita '18 B Freeze-in through decay A χ Standard Model bath Dark Matter A χ B Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

14 Freeze-in through decay ★ Mother (mediator) A in thermal equilibrium ★ Mediator A decays to Dark Matter and produce it Tiny coupling 1706.07442 B A y ⌧ 1 y - 4 χ - 6 Γ - 8 Γ [ A → B χ ] ∼ y 2 log 10 Y - 10 - 12 DM Particles in thermal abundance Dark Matter - 14 equilibrium - 16 - 1.0 - 0.5 0.0 0.5 1.0 1.5 2.0 log 10 x Width (lifetime) of the mediator A determines the DM abundance Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

15 FIMP phenomenology ✦ What is typical value of portal coupling? ✦ Can we probe FIMP DM experimentally? ◆ 2 ⇣ m DM ✓ ◆ ✓ 600 GeV Γ A FIMP Dark Matter ⌘ Ω h 2 ∼ 0 . 12 abundance 4 × 10 − 15 GeV 10 keV m A B Γ A ∼ y 2 Very small y ∼ 10 − 8 A y 8 π m A coupling !!! χ ★ Suppressed signal in direct detection ★ Suppressed signal in indirect detection Can LHC probe FIMP? Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

16 FIMP phenomenology ✦ Can we probe FIMP DM at LHC? YES ! To be in thermal ✦ Mediator has sizeable coupling with SM particles equilibrium ✦ Can be copiously produced at the LHC B P y A DM A B P y DM Long-lived Typical mediator decay length c τ A = 10 − 15 GeV ⇥ 19 cm . is macroscopic: Γ A EXOTIC SIGNALS @ LHC !!! equivalently mediators, , with Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

17 FIMP (decay) phenomenology ◆ 2 ⇣ Standard ✓ 5 cm ◆ ✓ 600 GeV m χ ⌘ Ω h 2 ∼ 0 . 12 Cosmology 10 keV c τ A m A history Macroscopic decay Mediator accessible Very light visible at LHC at the LHC Dark Matter m A = 600 GeV 1000 100 2 1 . 0 c t @ meter D = 10 2 Typical h Ω size for 1 detector 0.1 0.01 10 - 6 10 - 5 10 - 4 0.001 0.01 0.1 1 m c @ GeV D Light Dark Matter regime Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

18 FIMP (decay) phenomenology ◆ 2 ⇣ Standard ✓ 5 cm ◆ ✓ 600 GeV m χ ⌘ Ω h 2 ∼ 0 . 12 Cosmology 10 keV c τ A m A history Macroscopic decay Mediator accessible Very light visible at LHC at the LHC Dark Matter m A = 600 GeV 1000 100 2 1 . 0 c t @ meter D = 10 2 Typical Displaced dark h Ω size for matter at LHC 1 detector 0.1 ? 0.01 WDM signatures 10 - 6 10 - 5 10 - 4 0.001 0.01 0.1 1 m c @ GeV D Light Dark Matter regime Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

Calibbi, Lopez-Honorez, Lowette, AM 19 Singlet Doublet Freeze In ✦ Minimal model with few extra fermionic states Mahbubani, Senatore '05 ✓ + ✓ 0 ◆ ◆ d ( u ) 2 , 1 2 = , ( d ) 2 , − 1 2 = , ( s ) 1 , 0 Z 0 2 − s y u m m i m e p t r o y s ✦ Lagrangian coupling with the Higgs e d − L ⊃ µ d · u + y d d · H s + y u H † u s + 1 2 m s s s + h.c. y u ≡ y sin ✓ , y d ≡ y cos ✓ . Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019

Calibbi, Lopez-Honorez, Lowette, AM 20 Singlet Doublet Freeze In ✦ Minimal model with few extra fermionic states Mahbubani, Senatore '05 ✓ + ✓ 0 ◆ ◆ d ( u ) 2 , 1 2 = , ( d ) 2 , − 1 2 = , ( s ) 1 , 0 Z 0 2 − s y u m m i m e p t r o y s ✦ Lagrangian coupling with the Higgs e d − L ⊃ µ d · u + y d d · H s + y u H † u s + 1 2 m s s s + h.c. y u ≡ y sin ✓ , y d ≡ y cos ✓ . | m s | ⌧ | µ | y ⌧ 1 , ✦ Regime for Freeze-in: Radiative Similar to corrections Simple Higgsino-Bino with tiny mixing spectrum and decay modes Long-lived states Dark matter Alberto Mariotti (VUB) FIMP DM and LLP @ LHC 06-05-2019