Generic Dark Matter 13 TeV. Matteo Cremonesi FNAL On behalf of the ATLAS and CMS Collaborations Moriond EWK - March 18, 2016
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1 Generic Dark Matter 13 TeV Matteo Cremonesi FNAL On behalf of the ATLAS and CMS Collaborations Moriond EWK - March 18, 2016
2 Introduction From cosmological observations, 85% of the matter comprised of dark matter (DM) Collider approach: DM production by colliding SM particles at high energies 2
3 From EFT to Simplified Models q DM gsm gdm q DM 3
4 From EFT to Simplified Models Described by a small number of free parameters: Spin-1 mediator Mmed, MDM, gsm, gdm shapes of kinematic distributions not altered by coupling variations gsm gdm Couplings DM gsm=0.25, gdm=1(spin-1) gsm=1, gdm=1(spin-0) LHC DM Forum, arxiv: v1 4
5 From EFT to Simplified Models Assumptions: DM: Spin-1 mediator single particle, Dirac fermion gsm gdm DM stable and non-interacting Couplings Mediator Axial/Vector, Scalar/Pseudoscalar minimal decay width (e.g. to DM and to quarks) LHC DM Forum, arxiv: v1 5
6 From EFT to Simplified Models Spin-1 mediator gsm gdm DM Couplings LHC DM WG, arxiv:
7 From EFT to Simplified Models Spin-1 mediator gsm gdm DM Couplings LHC DM WG, arxiv:
8 From EFT to Simplified Models Experimental approach: tag events using recoiling object(s) ISR: jet/gamma/w/z gsm gdm MET measure missing transverse momentum (MET) Recoiling object 8
9 9
10 Monojet Signature Looking for events with: monojet Large MET At least one high Pt jet jet(s) DM DM 10
11 Monojet Signature Looking for events with: Z+jets Large MET At least one high Pt jet jet(s) Z ν ν 11
12 Monojet Signature Looking for events with: W+jets Large MET At least one high Pt jet jet(s) W ν l 12
13 Largest backgrounds from W/Z+jets Signal populates high MET 13
14 Monojet 13 TeV ] 2 ( -neutron) [cm SD ATLAS Preliminary s -1 = 13 TeV, 3.2 fb 90% CL limits LUX Axial Vector Mediator Dirac Fermion DM g q = 0.25, g = m 4 10 [GeV] CMS PAS EXO
15 13 TeV 15
16 Hadronic Mono-V Boosted boson decaying hadronically recoiling DM-pair => a large-radius jet and MET V fat jet V DM DM 16
17 Hadronic Mono-V Boosted boson decaying hadronically recoiling DM-pair => a large-radius jet and MET 17
18 Hadronic Mono-V 13 TeV ATLAS-CONF
19 Hadronic Mono-V 13 TeV ATLAS-CONF Strongest channel together with monojet 19
20 Monojet/Mono-V Combination 20
21 Monojet/Mono-V Combination monojet mono-v jet(s) V fat jet V DM DM DM DM 21
22 Monojet/Mono-V Combination 8 TeV Fitting simultaneously for both monojet and mono-v signals Considering all the analysis samples from both the searches CMS PAS EXO
23 Dijet DM Interpretation BR of mediator to jets depends on m DM : for large m DM, BR to jets is 100% for m DM around 1 GeV, BR to DM is about the same as BR to jets dijet signal rate drops by a factor of ~2 above m DM = M Med /2 the limit is constant 23
24 Dijet DM Interpretation BR of mediator to jets depends DM Mass [TeV] DM Simplified Model Exclusions ATLAS Preliminary March 2016 Dijet 8 TeV Perturbative unitarity Mono-γ 13 TeV Phys. Rev. D (2015) Axial-vector mediator, Dirac DM g q = 0.25, g DM 2 = 1 = 0.12 DM Mass = Mediator Mass h Thermal relic Ω c 2 h Thermal relic Ω c Mono-jet 13 TeV 2 = 0.12 Dijet 13 TeV < Phys. Lett. B (2016) h Ω c Mediator Mass [TeV] on m DM : for large m DM, BR to jets is 100% for m DM around 1 GeV, BR to DM is about the same as BR to jets dijet signal rate drops by a factor of ~2 above m DM = M Med /2 the limit is constant 24
25 b(b)/tt+dm Models tt/bb+dm More sensitive than other searches for the scalar interactions between DM and quarks Couplings proportional to quark masses 25
26 tt/bb+dm Analysis Events with < 3 jets, different search regions based on b-jet multiplicity 1 b-tag 2 b-tag 26
27 tt/bb+dm Results Single and double b- tag categories combined Limits on DM+bb only and DM+bb/tt combined CMS PAS B2G
28 Conclusion Amazing work has been done in both experiments so far: Unified interpretation and presentation of the results Lots of channel already investigated: monojet/photon, mono-v, DM+bb/tt Results with first LHC Run II data have been presented, more to come in the next weeks No signs for DM so far, but new data will be recorded by the summer and new exciting results will be produced 28
29 Backup
30 From EFT to Simplified Models Assumptions: DM: Spin-0 mediator single particle, Dirac fermion DM stable and non-interacting gsm gdm Mediator Couplings Axial/Vector, Scalar/Pseudoscalar minimal decay width (e.g. to DM and to quarks) LHC DM Forum, arxiv: v1 30
31 From EFT to Simplified Models Spin-1 mediator gsm gdm DM Couplings Spin-dependent LHC DM WG, arxiv:
32 Conversion into DM-Nucleon Scattering Cross Section SI-DM nucleon scattering cross section: DM-nucleon reduced mass: Vector Mediator-nucleon coupling: => 32
33 Dijet Limit Conversion Take the limits on gaussian-shaped resonances Compare these to MadGraph predictions for signal rates and shapes, after parton shower, detector smearing, and analysis cuts Not a full MC interpretation from other studies we expect that it will match a full MC very well Z limits in the 13 TeV paper and it agrees with those in the large mdm limit 33
34 Dijet Limits 34
35 Monotop 35
36 MonoHiggs 36
37 Invisible Higgs Limits 37
38 Monojet/Mono-V 8 TeV Fitting simultaneously for both monojet and mono-v signals Considering all the analysis samples from both the searches 38
39 Z+jets Background Model PROXY Di-mu/ele CR jets jets Z Z ν l ν l 39
40 Z+jets Background Model PROXY photon CR jets jets Z γ ν ν 40
41 W+jets Background Model PROXY Single mu/ele CR jets jets W W ν l ν l 41
42 b(b)/tt+dm Signal Looking for events with: Large MET At least one high Pt b-tagged jet b jet DM DM 42
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