Content mono-V Conclusion and next steps mono-Z mono-V Status - PowerPoint PPT Presentation

11.04.2016 - JDM Meeting T Philipp Gadow (on behalf of the team) | Max-Planck-Institut für Physik, München Search for hadronic Mono-V + E miss

Content mono-V Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) Conclusion and next steps Status Status mono-Z’ Multi-jet background estimation Post-fjt distributions Pre-fjt distributions Analysis overview 0 / 28 H → invisible H → invisible

Mono-V analysis overview Efgective Field Theory Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) Simplifjed Models 1 / 28 Search for dark matter with hadronically decaying Z / W boson in (resolved) T (merged) T the channels ◮ large- R jet + E miss ◮ pair of small R -jet + E miss using 13 . 2 fb − 1 of 2015 + 2016 data, interpreted in terms of H → invisible

Mono-V analysis overview t (1lep) Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) estimated with Signal signature and dominant backgrounds 2 / 28 Signal signature (0lep) (resolved) T (merged) T Dominant backgrounds ◮ large- R jet + E miss ◮ pair of small R -jet + E miss t ¯ W + jets (1lep) Z → ν ¯ ν (2lep) Z → µ ¯ µ ℓ not detected ℓ not detected H → invisible

Event selection T Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) T T T T t (1tag) Merged region use b-tagging (0tag, 1tag, 2tag) 3 / 28 0 leptons 1 lepton 2 leptons HLTxe70, HLTxe90  lepton triggers lepton triggers 0 loose e + µ 1 tight µ 1 loose µ , 1 medium µ ◮ MET > 250 GeV ◮ MPT > 30 GeV ◮ n large- R jet > 0 ◮ min ∆ φ ( j , E miss ) > 20 ◦ ◮ ∆ φ ( MET , MPT ) < 90 ◦ ◮ ∆ φ ( large- R jet , MET ) > 120 ◦ + � p µ MET := E miss discriminate between W + jets (0tag) MPT := p miss + � p µ and t ¯ H → invisible

Event selection T Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) T Resolved region 4 / 28 lepton triggers 0 leptons 1 lepton 2 leptons HLTxe70, HLTxe90  lepton triggers 0 loose e + µ 1 tight µ 1 loose µ , 1 medium µ ◮ MET > 150 GeV > 30 GeV ◮ p miss ◮ n central jet = 2 or 3 ◮ n forward jet = 0 ◮ p leading jet > 45 GeV ◮ p j 1 T + p j 2 T > 120 GeV or p j 1 T + p j 2 T + p j 3 T > 150 GeV ◮ min ∆ φ ( j , E miss ) > 20 ◦ ◮ ∆ φ ( MET , MPT ) < 90 ◦ ◮ ∆ φ ( dijet , MET ) > 120 ◦ ◮ ∆ φ ( jet 1 , jet 2 ) > 140 ◦ H → invisible

Pre-fjt distributions 0 lep, merged region, 0+ b-tags T values Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 5 / 28 ◮ Poor modeling of low p miss ◮ Overall reasonable data/MC agreement H → invisible

Pre-fjt distributions 0 lep, merged region, 0+ b-tags Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 6 / 28 ◮ Blinding harmonised between mono-H and mono-V search H → invisible

Pre-fjt distributions 0 lep, merged region, split in b-tag regions Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) t 7 / 28 search included in mono-V 2+ b-tags 1 b-tag 0 b-tags ◮ B-tagging now ◮ good discrimination of t ¯ H → invisible

Pre-fjt distributions 0 lep, resolved region, 0+ b-tags included yet Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 8 / 28 ◮ Moderate data/MC agreement, multi-jet contribution not H → invisible

Pre-fjt distributions 0 lep, resolved region, split in b-tag regions Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) t 9 / 28 search included in mono-V 2+ b-tags 1 b-tag 0 b-tags ◮ B-tagging now ◮ good discrimination of t ¯ H → invisible

Pre-fjt distributions 1 lep, merged region: W +jets (0 b-tags) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 10 / 28 ◮ moderate data/MC agreement ◮ slope in large- R jet shape H → invisible

Pre-fjt distributions t (1+ b-tags) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 11 / 28 1 lep, merged region: t ¯ ◮ reasonable data/MC agreement ◮ slope in large- R jet shape H → invisible

Pre-fjt distributions Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 12 / 28 2 lep, merged region: Z → µ ¯ µ , 0+ b-tags ◮ resonable data/MC agreement ◮ high purity in Z +jets H → invisible

Post-fjt distributions merged region, 0 b-tags signal region (0lep) CR W +jets (1lep) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 13 / 28 CR Z → νν (2lep) H → invisible

Post-fjt distributions merged region, 1 b-tag signal region (0lep) t (1lep) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 14 / 28 CR t ¯ CR Z → νν (2lep) H → invisible

Post-fjt distributions merged region, 2 b-tags signal region (0lep) t (1lep) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 15 / 28 CR t ¯ CR Z → νν (2lep) H → invisible

Post-fjt distributions resolved region, 0 b-tags signal region (0lep) CR W +jets (1lep) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 16 / 28 CR Z → νν (2lep) H → invisible

Post-fjt distributions resolved region, 1 b-tag signal region (0lep) t (1lep) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 17 / 28 CR t ¯ CR Z → νν (2lep) H → invisible

Post-fjt distributions resolved region, 2 b-tags signal region (0lep) t (1lep) Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 18 / 28 CR t ¯ CR Z → νν (2lep) H → invisible

Multi-jet background estimation in 0lep, merged in 0lep, merged, still very preliminary Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 19 / 28 ◮ defjne QCD-enriched region by lowering requirement on MET > 150 GeV ◮ divide events in QCD and signal-like region by inversion of min ∆ φ ( j , MET ) > 20 ◦ requirement H → invisible

Multi-jet background estimation t Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) in 0lep, merged, still very preliminary 20 / 28 [t] pulls Pre-fjt Post-fjt → ◮ profjle-likelihood fjt for QCD shape normalisation: 0 . 058 ± 0 . 014 α VV α t α t ¯ α W+jets α Z+jets − 0 . 037 ± 0 . 994 − 0 . 028 ± 0 . 994 − 0 . 093 ± 0 . 993 − 1 . 880 ± 0 . 406 1 . 718 ± 0 . 253 σ H → invisible

Multi-jet estimation Aim for closure tests the QCD region template fjt in MET distribution and check if the model describes the data Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 21 / 28 ◮ Take a QCD template of another variable, e.g. m large- R jet in ◮ Apply the QCD normalisation factor derived from the QCD ◮ Use the resulting QCD distribution in the signal-like region H → invisible

Multi-jet estimation Questions to JDM Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) double counting of uncertainties then? Use the uncertainty of the QCD template fjt? What about unblinded data? and rescale it to the expected normalisation given the used in the fjnal fjt? small. What is small enough to be allowed to neglect it? 22 / 28 ◮ Overall opinion on this approach? ◮ For MET > 250 GeV the QCD event fraction appears to be ◮ If we don’t neglect it, how should we derive QCD templates ◮ Note: the current study is based on blinded data. ◮ Should we estimate the QCD contribution as presented here ◮ How should we estimate the uncertainy of the QCD template? H → invisible

mono-Z’ status same set-up (trigger, object defjnitions, SR, CRs) as in mono-V Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP)  PANDA production page  JIRA ticket  Event generation details Signal samples are in production(see  JDM talk) EFT models simplifjed model of interpretation in terms 23 / 28 ◮ Dark Higgs model ◮ light Z ′ vector ◮ light Z ′ /Inelastic ◮ ◮ ◮ H → invisible

same set-up (trigger, object defjnitions, SR, CRs) as in mono-V Signal production in progress, fjrst validation plots created Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 24 / 28 H → invisible status → for H truth particle → for Z truth particle H → invisible

Conclusion and next steps mono-V Conclusion and next steps mono-Z’ mono-V Status report Philipp Gadow (MPP) 25 / 28 mono-Z’ benefjt ◮ added b-tagging to analysis for improved sensitivity ◮ mono-V QCD estimate strategy on good way, mono-H might ◮ working on fjt and sensitivity estimate with 13 fb − 1 ◮ signals are being produced H → invisible ◮ working on signal production H → invisible

Additional material Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 26 / 28 H → invisible

Multi-jet estimation Why not the ABCD method? Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 27 / 28 H → invisible

Multi-jet estimation Why not the ABCD method? Philipp Gadow (MPP) Status report mono-V mono-Z’ Conclusion and next steps 28 / 28 ◮ ABCD method unreliable for poor data/mc agreement H → invisible