Compressed Mass Scenarios via VBF Dijet and ISR Jet Tagging at Future Circular Hadron Colliders
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1 Compressed Mass Scenarios via VBF Dijet and ISR Jet Tagging at Future Circular Hadron Colliders Teruki Kamon Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University & Kyungpook National University VHEPP Physics Seminar Fermilab, July 23, 2015 July 2015 CMS via VBF/ISR at FCC 1
2 E A 100-TeV collider is powerful in producing heavy objects. July 4, 2012 LHC8 Higgs LHC13+ Outline Precision Hadron Collider ( s ) Gluino/Squark Mass Reach (M) M/ s Tevatron (2 TeV) ~400 GeV 0.20 LHC (8 TeV) ~1.7 TeV 0.21 LHC (14 TeV) ~2.8 TeV* 0.20* FCC (100 TeV) ~20 TeV* 0.20* 2 (*) just use a naïve scaling Understanding the limitations at the LHC14 will be an important step for FCC100pp Today s tolk selected topics on SUSY Searches via VBF dijet and ISR jet tagging from present results and/or prospects Summary
3 TeV pp Collider km x $3000/m = $810M CMS via VBF/ISR at FCC 3
4 4
5 Questions What do we do with (i) really heavy 1 st /2 nd generation squarks and/or gluino, and (ii) small DM (mass difference between NLSP and LSP)? How can we probe Compressed SUSY Scenarios at hadron collides? 1) Tagging energetic jets (+ MET) from cascade decays 2) Tagging leptons 3) Tagging photons 4) Tagging with timing, vetexing 5) ISR jet, VBF dijet Let me focus on ISR and VBF ISR jet tagging VBF-like dijet tagging 5
6 Selected Papers for e+e- Colliders Many papers to discuss the cases for e+e- colliders. See, for example, below: : C.H. Chen, Manuel Drees, and J.F. Gunion, Searching for invisible and almost invisible particles at e+ e- colliders, Phys. Rev. Lett. 76 (1996) 2002 [hep-ph/ ] C.H. Chen, Manuel Drees, and J.F. Gunion, A Nonstandard string / SUSY scenario and its phenomenological implications, Phys. Rev. D55 (1997) 330, Erratum-ibid. D60 (1999) [hep-ph/ ] this is probably the first to consider and motivate AMSB boundary conditions. 6
7 Selected Papers on ISR and VBF J.F. Gunion and S. Mrenna, A study of SUSY signatures at the Tevatron in models with near mass degeneracy of the lightest chargino and neutralino, PRD62 (2000) [ ] Yang Bai and Tim M.P. Tait, Inelastic Dark Matter at the LHC, PLB 710 (2012) 335 [ ] (MonoJet + Decay Vertex) Pedro Schwaller and Jose Zurita,, Compressed electroweakino spectra at the LHC. JHEP 03 (2014) 060 [ ] Howard Baer, Azar Mustafayev, Xerxes Tata, Monojets and mono-photons from light higgsino pair production at LHC14, PRD 89 (2014) [ ] Ning Zhou, David Berge, Daniel Whiteson, Monoeverything: combined limits on dark matter production at colliders from multiple final states, PRD 87 (2013) [ ] Chengcheng Han, Archil Kobakhidze, Ning Liu, Aldo Saavedra, Lei Wu and Jin Min Yang, Probing light higgsinos in natural SUSY from monojet signals at the LHC, JHEP 02 (2014) 049 [ ] Teruki Kamon CMS via VBF/ISR at FCC Zhenyu Han, Graham D. Kribs, Adam Martin, Arjun Menon, Hunting quasi-degenerate higgsinos, PRD 89 (2014) [ ] Howard Baer, Azar Mustafayev and Xerxes Tata, Monojet plus soft dilepton signal from light higgsino pair production at LHC14, PRD 90 (2014) [ ] Zhenyu Han and Yandong Liu, MT2 to the rescue -- searching for sleptons in compressed spectra at the LHC, PRD 92 (2015) [ ] 7
8 Selected Papers on ISR and VBF A. Datta, P. Konar, and B. Mukhopadhyaya, Invisible charginos and neutralinos from gauge boson fusion: a way to explore anomaly mediation, PRL 88 (2002) B. Dutta, W. Flanagan, A. Gurrola, W. Johns, T. Kamon, P. Sheldon, K. Sinha, K. Wang, S. Wu, Probing compressed top squarks at the LHC at 14 TeV. PRD 90 (2014) G. Giudice, T. Han, K. Wang, and L.T. Wang, Nearly degenerate gauginos and dark matter at the LHC, PRD 81 (2010) B. Dutta, A. Gurrola, W. Johns, T. Kamon, P. Sheldon, K. Sinha, Vector boson fusion processes as a probe of supersymmetric electroweak sectors at the LHC, PRD 87 (2013) A.G. Delannoy, B. Dutta, A. Gurrola, W. Johns, T. Kamon, E. Luiggi, A. Melo, P. Sheldon, K. Sinha, K. Wang, S. Wu, Probing dark matter at the LHC using vector boson fusion processes, PRL 111 (2013) B. Dutta, T. Ghosh, A. Gurrola, W. Johns, T. Kamon, P. Sheldon, K. Sinha, K Wang, S. Wu, Probing Compressed Sleptons at the LHC using Vector Boson Fusion Processes, PRD 91 (2015) [ ] A. Berlin, T. Lin, M. Low, L.-T. Wang, Neutralinos in Vector Boson Fusion at High Energy Colliders, PRD 91 (2015) [ ] B. Dutta, A. Gurrola, K. Hatakeyama, W. Johns, T. Kamon, P. Sheldon, K. Sinha, S. Wu, Zhenbin Wu, Probing Compressed Bottom Squarks with Boosted Jets and Shape Analysis, [ ] 8
9 Selected Papers on ISR and VBF Marco Cirelli, Filippo Sala, Marco Taoso, Wino-like Minimal Dark Matter and future colliders, JHEP 10 (2014) 033, Erratum-ibid. 01 (2015) 041 [ ] 9
10 VBF Cross Sections PRL 111 (2013) Tathagata Ghosh, Aspen TeV 14 TeV 100 TeV 10
11 VBF Cross Sections [II] A. Berlin, T. Lin, M. Low, L.-T. Wang, Neutralinos in Vector Boson Fusion at High Energy Colliders, PRD 91 (2015) [ ] Tathagata Ghosh, Aspen 2015 agree 8 TeV 14 TeV 100 TeV 11
12 ISR Invisible vs. VBF Invisible EPJC 75 (2015) 235 [ ], CMS-EXO , CERN-PH-EP EPJC 74 (2014) 2980 [ ], CMS-HIG , CERN-PH-EP One energetic jet, pt > 110 GeV, h < 2.4, and allow an additional jet (pt > 30 GeV) MET > 250 GeV 500 GeV Veto event if j3 pt > 30 GeV Veto event if Df(j1,j2) > 2.5 Veto event if they contain isolated electrons or muons with pt > 10 GeV; or hadronic tau with > 20 GeV VBF tag jet pair, pt,j1, pt,j2 > 50 GeV, η < 4.7, ηj1*ηj2 < 0, ηjj > 4.2, and Mjj > 1100 GeV; Df(j1,j2) < 1.0 MET > 130 GeV Central jet veto (event that has an additional jet with pt > 30 GeV and pseudorapidity between those of the two tag jets); Lepton veto with pt > 10 GeV. 12
13 ISR Invisible vs. VBF Invisible Z/W ratio ~ 3 Z/W ratio ~ 1/2 CMS Preliminary Lepton ID Better with low p T, large h 13
14 Higgs portal to DM: H(inv) EPJC 74 (2014) 2980 [ ], CMS-HIG , CERN-PH-EP DM particles have the direct couplings to the SM Higgs boson sector, H cc; (a) Limits on branching fraction of Higgs to invisible particles used for limits on DM, (b) Scalar, vector or fermionic couplings, (c) Limits only up to DM mass M c < M H /2 Good S/B ratio Poor S/B ratio 14
15 ISR Invisible vs. VBF Invisible EPJC 75 (2015) 235 [ ], CMS-EXO , CERN-PH-EP EPJC 74 (2014) 2980 [ ], CMS-HIG , CERN-PH-EP [Beyond EFT approach] See, for example, S. Baek, P. Ko, and W. Park, PRD 90 (2014) [ ] for explicit expressions within UV completions 15
16 VBF Invisible Df(jj) PLB 495 (2000) 147 arxiv: Auxiliary plot using PGS4 using the cuts in PRL 111 (2013) W+jets l x n W j j j n l x W 16 j
17 Forward Detector Challenge Lost-lepton is a dominant BG source in many SUSY searches. It depends on performance of the forward detector system (tracker, muon, and calorimeter) The VBF SUSY was one of representative CMS SUSY projections for the ECFA (European Committee for Future Accelerator) workshop in 2013 [CMS PAS FTR Study of the Discovery Reach in Searches for Supersymmetry at CMS with 3000 fb -1 ] One of key conclusions was the possible gain from extending the tracker up to a pseudo-rapidity of four is studied for vector boson fusion processes. Pile-ups: Ultra-fast timing on forward calorimeter to reject out-of-time jets? CMS PAS FTR
18 Next Gen. Searches via VBF The final state is same as invisible Higgs signal, but larger p T jets Cross section? Wino-like DM Bino-Higgsino DM Example, disappearing tracks? jj MET X CMS-EXO , JHEP 01 (2015) 096 [ ] Search for disappearing tracks in events with jet p T > 100 GeV, MET > 100 GeV for direct production of C1N2 and C1C1. 18
19 Long-Lived (LL) Interpretations [EXO ] Constraints on the pmssm, AMSB model and on other models from the search for LL charged particles in proton-proton collisions at sqrt(s) = 8 TeV, accepted for publication in EPJC [EXO , JHEP 01 (2015) 096] Search for disappearing tracks in proton-proton collisions at sqrt(s) = 8 TeV Disappearing tracks (as a signature of LL particle decaying inside the CMS detector) are identified as those with little or no associated calorimeter energy deposits and with missing hits in the outer layers of the tracker. Limits are set on the cross section of direct electroweak chargino production in terms of the chargino mass and mean proper lifetime. 19
20 Wino DM with ISR, VBF and DT Marco Cirelli, Filippo Sala, Marco Taoso, Wino-like Minimal Dark Matter and future colliders, JHEP 10 (2014) 033, Erratum-ibid. 01 (2015) 041 [arxiv: v2]! 20
21 Wino DM with ISR, VBF and DT Marco Cirelli, Filippo Sala, Marco Taoso, Wino-like Minimal Dark Matter and future colliders, JHEP 10 (2014) 033, Erratum-ibid. 01 (2015) 041 [arxiv: v2] ISR Jet VBF Dijet DTs! 21
22 Light Higgsinos in MonoJet Detecting light Higgsinos in ISR jet tagging (Monojet events). See arxiv: (*), for example. See also the next page. We see a reach at ~200 GeV at 14 TeV 100 TeV? (*) Chengcheng Han, Archil Kobakhidze, Ning Liu, Aldo Saavedra, Lei Wu and Jin Min Yang, Probing light higgsinos in natural SUSY from monojet signals at the LHC, JHEP 02 (2014) 049 [arxiv: ] 22
23 More on Higgsinos with ISR Jet 23
24 Wino and Higgsino via VBF A. Berlin, T. Lin, M. Low, L.-T. Wang, Neutralinos in Vector Boson Fusion at High Energy Colliders, PRD 91 (2015) [ ] Given a systematic uncertainty of 5% with 3000 fb 1 [LHC14] 125 GeV Winos and 55 GeV Higgsinos [100 TeV] 750 GeV Winos and 180 GeV Higgsinos [Comments] The forward detector system (tracking, calorimeter, muon) must be good for lepton veto and vertexing for forward jets. Ultra-fast timing on forward calorimeter for trigger? Central tracking, calorimeter, muon lepton ID from 5 GeV?? We want to lower lepton p T threshold and cover larger h coverage for future detector. 24
25 Wino and Higgsino via VBF A. Berlin, T. Lin, M. Low, L.-T. Wang, Neutralinos in Vector Boson Fusion at High Energy Colliders, PRD 91 (2015) [ ] [Abstract] Discovering dark matter at high energy colliders continues to be a compelling and well-motivated possibility. Weakly interacting massive particles are a particularly interesting class in which the dark matter particles interact with the standard model weak gauge bosons. Neutralinos are a prototypical example that arise in supersymmetric models. In the limit where all other superpartners are decoupled, it is known that for relic density motivated masses, the rates for neutralinos are too small to be discovered at the Large Hadron Collider (LHC), but that they may be large enough for a 100 TeV collider to observe. In this work we perform a careful study in the vector boson fusion channel for pure winos and pure higgsinos. We find that given a systematic uncertainty of 1% (5%), with 3000 fb 1, the LHC is sensitive to winos of 240 GeV (125 GeV) and higgsinos of 125 GeV (55 GeV). A future 100 TeV collider would be sensitive to winos of 1.1 TeV (750 GeV) and higgsinos of 530 GeV (180 GeV) with a 1% (5%) uncertainty, also with 3000 fb 1. 25
26 Top Squark Decay Modes m c1 0 Dm m -m c t (off-shell W) (off-shell top) (on-shell top) m W m t m t Teruki Kamon CMS via VBF/ISR at FCC 26
27 Top Squark Results at 8 TeV ICHEP DM=30 Teruki Kamon m W m top CMS via VBF/ISR at FCC 27
28 MET in Compressed Top Squark 8 TeV 1 2 ICHEP 2014 CMS-SUS Teruki Kamon m W m top CMS via VBF/ISR at FCC 28
29 3 rd Generation Squark Accepted in JHEP [ ] CMS Preliminary [VBF] We expect a comparable VBF SUS result on compressed stop/sbottom. 29
30 VBF as Tool for Compressed SUSY VBF tagged jets (2 energetic jets with large Dh separation: large M(jj)) in forward region, opposite hemispheres) VBF production topology in transverse plane Teruki Kamon CMS via VBF/ISR at FCC 30
31 Challenging Compressed Stop 31
32 Next Gen. Search for Compressed X PRD 90 (2014) VBF+stops: GeV at 2s at 14 TeV VBF jj + stops ISR jet + stops? ISR g + stops? 32
33 Next Gen. Search for Compressed X B. Dutta, A. Gurrola, K. Hatakeyama, W. Johns, T. Kamon, P. Sheldon, K. Sinha, S. Wu, Zhenbin Wu, Probing Compressed Bottom Squarks with Boosted Jets and Shape Analysis, [ ] VBF jj + sbottom ISR jet + sbottom? ISR g + sbottom? VBF+sbottom: 541 (462) GeV at 95%CL (3s ) at 14 TeV & 50PU 33
34 Electroweak (EWK) Sector x = 0.5 (maximum sensitivity) Wino-Chargino and Bino- LSP Up to ~700 and ~300 GeV for light slepton case Up to 320 and 100 GeV for W and Z cases Lower limits for heavy slepton being Higgsinos small mass difference (compressed spectra) 34
35 SUSY VBF [SUS ] Search for supersymmetry with the vector boson fusion topology in proton-proton collisions at /s = 8 TeV, Physics Analysis Summary (CERN link: The first SUSY search of its kind in public (March 2015) Inclusive muon trigger and ditau trigger mu-mu, mu-e, mu-tau, tau-tau ; OS & LS Run 2: VBF + soft lepton triggers 35
36 SUSY VBF MG5, Dh > 4.2 QCD2QED2 + QCD0QED4 SUS SUS
37 SUSY VBF vs. Direct MG5, Dh > 4.2 QCD2QED2 + QCD0QED4 SUS x ~ 0.95 (maximum sensitivity) SUS EPJC 74 (2014) 3036 [ ] x = 0.5 (maximum sensitivity) 37
38 SUSY + Another Higgs Wanted MSSM Higgs (e.g., A H and H + H - ), Non-MSSM Higgs Colored Sectors Gluinos Heavier(?) 1 st /2 nd generation scalar quarks (squaks) Lighter(?) 3 rd generation squarks (stop, sbottom) Charginos (C1, C2), Neutralinos (N1, N2, N3, N4), decaying into: Compressed scenarios at Leptons, Higgs, W, Z hadron collides LSP? Lightest Neutralino (N1): Bino-like, Wino-like, Higgsino-like, Bino-Higgsino-like.. [Example] Higgsino LSP chargino and neutralinos below 200 GeV, with mass splittings of order 10 GeV. It is very difficult for LHC to observe these particles. Gravitino Sleptons Selectrons and smuons - mass degenerate? Special case: Stau is lighter. Displaced Tracks Long-Lived (LL) RPV +??? 38
39 E July 4, 2012 Run2 and Beyond FCC will be powerful in producing heavy objects. LHC13+ Hadron Collider ( s ) Gluino/Squark Mass Reach (M) M/ s Tevatron (2 TeV) ~400 GeV 0.20 LHC (8 TeV) ~1.7 TeV 0.21 LHC (14 TeV) ~2.8 TeV* 0.20* FCC (100 TeV) ~20 TeV* 0.20* (*) just use a naïve scaling [Run1 at 8 TeV] the LHC8 has started probing a TeV physics: discovery of a Higgs boson with null results on BSM (or we may be seeing hints?). LHC8 Higgs Precision [Run2 at 13 TeV] Exciting! Understanding the limitations of the LHC13 will be an important step toward the next energy frontier 39
40 Summary 100 TeV collider, powerful; VBF luminosity, stronger. Physics menu with VBF dijet and ISR jet tagging: Invisible, Higgsino, Wino, Stop, Sbottom, Slepton But, the forward detector system (tracking, calorimeter, muon) must be good for lepton veto and vertexing for forward jets. Ultra-fast timing on VF calorimeter for trigger? Central tracking, calorimeter, muon lepton ID from 3-5 GeV?? 40
41 Backups 41
42 Higgs portal to DM: Results EPJC 74 (2014) 2980 [ ], CMS-HIG , CERN-PH-EP % CL observed upper (expected) limit on B(H inv) = 0.51(0.38) 95% CL observed upper (expected) limit on B(H inv) = 0.58(0.44) Upper limits on the spinindependent DM-nucleon cross section in Higgsportal models, derived for mh = 125GeV, and B(H inv) < 0.51 at 90% CL, as a function of the DM mass. [Beyond EFT approach] See, for example, S. Baek, P.. Ko, and W. Park, PRD 90 (2014) [ ] for explicit expressions within UV completions Teruki Kamon CMS Dark Matter 42
43 Top Squark Decay Modes Dm m m c Stop decay Stop mixing & neutralino/chargino composition & - t 0 1 m c1 0 Dm m -m c t 0 1 (off-shell W) (off-shell top) (on-shell top) m W m t m t Teruki Kamon CMS Dark Matter 43
44 Monojet: Remarks Limitation of EFT Simplified Model with M * EFT is valid when mediator mass (M * ) > a fewtev The couplings required are large comparing this with known couplings: o strong interaction ~1.2 o weak interaction ~0.6 Theory is non-perturbative if g q g DM > 4p Width larger than mass, so unlikely mediator will be identified as a particle Region I: EFT limit is good! Region II: EFT limit is too weak! Region III: EFT limit is too strong! III II I See, for example, arxiv: for further reading. Teruki Kamon CMS Dark Matter 44
45 Monophoton MET > 140 GeV One energetic photon, pt > 145 GeV, h < Veto on jets, leptons, and pixel seeds (hit pattern in the pixel detector) Df(photon,MET) > 2 MinMET > 120 GeV, Prob(χ 2 ) (Reduce fake MET events) g pt MET Teruki Kamon CMS Dark Matter 45
46 Monophoton: Results Vector operator spin independent (SI) Axial-vector operator spin-dependent (SD) Teruki Kamon CMS Dark Matter 46
47 Higgs portal to DM: VBF H(inv) arxiv: v2 DM particles have the direct couplings to the SM Higgs sector, H c c Limits on branching fraction of Higgs to invisible particles used for limits on DM Can be scalar, vector or fermionic couplings Limits only up to DM mass Mχ < MH/2 Veto events with an identified electron, or muon with pt > 10 GeV. VBF tag jet pair, pt,j1, pt,j2 > 50 GeV, η < 4.7, ηj1, ηj2 < 0, ηjj > 4.2, and Mjj > 1100 GeV MET > 130 GeV Df(j1,j2) < 1.0 Central jet veto (event that has an additional jet with pt > 30 GeV and pseudorapidity between those of the two tag jets) Teruki Kamon CMS Dark Matter 47
48 Remark on Compressed X Teruki Kamon CMS Dark Matter 48
49 Top/Bottom Squark Results at 8 TeV SUS Fig. 9 SUS Fig
50 3 rd Generation Squark ICHEP SUS [ ] JHEP 06 (2015) 116 SUS (monojet stop) SUS (stop) SUS (sbottom) Teruki Kamon CMS Dark Matter 50
51 ublic/physicsresultsexo12048 EPJC 75 (2015) 235 [ ] One energetic jet, pt > 110 GeV, h < 2.4, and allow an additional jet (pt > 30 GeV); MET > 250 GeV Veto event if j3 pt > 30 GeV Veto event if Df(j1,j2) > 2.5 Veto event if they contain isolated electrons or muons with pt > 10 GeV; or hadronic tau with > 20 GeV MET Monojet/Monophoton ublic/physicsresultsexo12047 One energetic photon, pt > 145 GeV, h < ; MET > 140 GeV Veto on jets, leptons, and pixel seeds (hit pattern in the pixel detector) Df(photon,MET) > 2 MinMET > 120 GeV, Prob(χ 2 ) (Reduce fake MET events) MET Teruki Kamon CMS Dark Matter 51
52 Monojet/Monophoton: Results Vector operator spin independent (SI) III II I Λ = Contact interaction scale Region I: EFT limit is good! Region II: EFT limit is too weak! Region III: EFT limit is too strong! 10 TeV EFT is valid for heavy mediator mass (M * ) > a few 10 TeV; The couplings required are large comparing this with known couplings: Theory is non-perturbative if g q g DM > 4p Width larger than mass, so unlikely mediator will be identified as a particle EFT (L) a minimal framework (M*, couplings, DM types) for a comprehensive interpretation of collider results with other experiments (e.g., Direct Detection). See O. Buchmueller, S. Malik, M. Dolan, and C. McCabe, arxiv: Teruki Kamon CMS Dark Matter 52
53 DM with Rasor Vector operator spin independent (SI) Λ = Contact interaction scale Results are comparable to those in the CMS monojet analysis. Teruki Kamon CMS Dark Matter 53
54 Monolepton (W ln) and Monotop (jjb) ublic/physicsresultsexo ublic/physicsresultsb2g12022 PRL 114 (2015) [ ] a FC [Note] ξ = -1 and 0 are not gauge invariant simplified models Monojet Vector operator spin independent (SI) DM coupling set to 0.1 for q = u/d [ ] Exclude scalar (vector) DM masses below 327 (655) GeV Teruki Kamon CMS Dark Matter 54
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