Search for Supersymmetry at CMS

Transcription

1 Search for Supersymmetry at CMS Teruki Kamon on behalf of the CMS Collaboration Mitchell Institute for Fundamental Physics and Astronomy Texas A&M University Mitchell Conference on Collider Physics, Dark Mateer, Neutrino Physics May 2018, College Station, TX (United States) May 23, 2018 [Credits] Images of Baryon Acoustic Bscillations with Cosmic Microwave Background by E.M. Huff, the SDSS-III team, and the South Pole Telescope team. Graphic by Zosia Rostomian (Lawrence Berkeley National Laboratory) Image of Neutrino Astrophysics, taken from Image of the LHC by CERN Photo Image of Bullet Cluster by NASA/ Chandra X-ray Center CMS SUSY 1

2 CMS Operation and Papers in Numbers Schematic view of the 12,500-ton CMS Detector with its main components. L int N papers 2

3 links CMS Physics Triggers JINST 12 (2017) P ) Tagging energetic jets (+ MET) from cascade decays 2) Tagging leptons 3) Tagging photons 4) Tagging with timing 5) ISR jet(s), VBF dijet 6) E T miss Particle IDs with Particle Flow JINST 12 (2017) P E T miss

4 D4 = Digging Down, Down, and Down CMS Preliminary [1982] W and Z with e, μ Now full measurements σ [1995] ttҧ miss with l + jets/b + E T Now full measurements [2012] H(125) with γγ, 4l Now full measurements 1 fb This demonstrates the CMS detector is functioning well to test the SM. 4

5 Deviation from the SM The SM is successful in explaining a wide variety of physics, aside from two to three standard deviation effects, despite possessing structural defects. SM Shadows of BSM 5

6 Supersymmetry (SUSY) The SM is successful in explaining a wide variety of physics, aside from two to three standard deviation effects, despite possessing structural defects. So far, no sign of Beyond the SM (e.g., SUSY) in very diverse search programs. SUSY in splitting scenario? Compressed-mass spectra scenarios? We should continue studying various challenging final states. SM BSM Nature of colored and noncolored sectors? S. Kamon 0 1 ( B, W, Hd, H ) u 1 ( W, H 1 ( W, H u ) d ) 6

7 LHC SUSY Probe Metric (I) 1 st /2 nd generation squarks and gluino, (II) 3 rd generation squarks, (III) non-colored sectors and (IV) (very) small DM (mass difference between NLSP and LSP) Triggers: 1) Tagging energetic jets (+ MET) from cascade decays 2) Tagging b s, top s, Higgs 3) Tagging leptons, photons 4) Tagging ISR jet 5) Tagging VBF jets WW Collider 6) Tagging with timing 1) Selected CMS searches for SUSY in colored sectors and non-colored sectors. 2) Summary & Remarks 7

8 SUSY Exploration Map g തq q തqq χ 1 0 m q = m χ1 0 Compressed Mass (<50 GeV) Scenario? Teruki Kamon m g or q 0 1 ( B, W, Hd, Hu ) ( W, H 1 ( W, H u ) d ) CMS SUSY 8

9 s Multi-dimensional Search Regions SUS H T miss > 300 GeV H T > 300 GeV N jets 2 H T mis N j, N b, N l, N τ X X H T 9

10 Squarks/Gluinos g തq q തqq χ 1 0 g തb b തbb χ 1 0 q = u, ሚd, s, ǁ cǁ m q = m b = 10

11 m b m χ 1 0 = 5 GeV Bottom Squarks VBF: SUS m 25 GeV 315 GeV 250 GeV Monojet: SUS g Monojet & 2b SUS (8 TeV) [Q] Do we still care of the extremely compressed mass (< 10 GeV) scenario? 11

12 Gluino with H( bb) CMS-PAS-BTV g തq q തqq χ 2 0 m q = m g m χ2 0 = 50 12

13 Gluino with H( bb) Results CMS-SUS ; CERN-EP χ 2 0 H χ 1 0 or Z χ 1 0 in heavy gluino ( g) decay high p T H bb decay with small opening angle Event with p T miss > 300 GeV; Use large cone (AK8) jets to capture full Higgs decay (presence of two displaced subjets). Jet mass shows clear peaking structure Search for 2H and 1H events (T5HH and T5HZ models) m J T5HZ T5HH 13

14 Top Squarks Stop decay Stop mixing & neutralino/chargino composition & t g Dm m m Δm = mሚt m χ

15 CMS-SUS ; CERN-EP Tops Top (t) quarks in top squarks ( ǁ t) or gluinos ( g) decay high p T t decay with small opening angle Event with p T miss > 250 GeV and H T > 300 GeV; Use AK8 jets to capture full top decay (3 subjets); two or three AK4 jets Search for 1t and 1b events 15

16 CMS-PAS-SUS Top Sqaurk Results 2 3 CMS-SUS ; CERN-EP

17 Gluino with Tops Results CMS-SUS ; CERN-EP m ሚ t = m( ǁ t)-m( χ 1 0 )=20 GeV 17

18 Non-colored SUSY Probe Metric Charginos, Neutralinos, Sleptons Multiple Leptons + MET Photons + MET Outside a box Multiple Leptons + no MET W RPV ijk L L i j E k ijk Lepton Number Violation L Q i j D k k i L H i u U ijk i D j D k Baryon Number Violation non-pointing g delayed g Selected topics, here Teruki Kamon LHC SUSY Searches (II) 18

19 Chargino-Neutralino Limits on σ(χ 1 ± χ 2 0 ) with decays via (a) sleptons or (b) W/Z/H x = 0.5 (maximum sensitivity) Wino-Chargino and Bino-LSP Up to ~1150 and ~700 GeV for light slepton case; Up to 450 and 150 GeV for W and Z cases Weaker limits for Heavy slepton; being Higgsinos; small mass difference (compressed mass spectra) Dimuon (3 GeV) + MET (50 GeV) trigger (offline: p T > 5 GeV and MET > 125 GeV) Soft OS dilepton in compressed mass spectra (DM < 20 GeV). 19

20 Chargino-Neutralino with Taus CMS-PAS-SUS (m χ2 0, m τ, m χ1 0) τ h + l or e + μ Event with Δφ(ττ), ΣM T, and/or p T miss Search for OS 2τ x = 0.95 (200, 197,5, 150) x = 0.50 (200, 175, 150) x = 0.05 (200, 152,5, 150) Can we access to the compressed mass scenarios ( )? 20

21 LL Results (2016) 21

22 Electroweak Gauginos Squarks Gluinos Summary of Run2 in Covering a large variety of possible final states even with <PU> ~25 Setting stringent limits on many SUSY scenarios including compressed mass SUSY. See the public result pages: GeV 2000 GeV 22

23 S. Kamon Hunting for SUSY We examined pp collisions for (i) Simplified Model Spectra (SMS) Scenarios; (ii) Minimal and non-minimal scenarios in Supersymmetric SM; (iii) Minimal and non-minimal scenarios in AMSB, GMSB, SUGRA/CMSSM; (iii) Natural SUSY, Split SUSY; (iv) RPV Heavy 1 st /2 nd generation squarks and gluino, not-so light 3 rd generation squaks, but light non-colored sector with (very) small M (mass difference between NLSP and LSP) Teruki Kamon How can we probe noncolored SUSY sector? 1) Tagging energetic jets (+ MET) from cascade decays 2) Tagging leptons 3) Tagging photons 4) Tagging with ISR jet, VBF jets 5) Tagging with timing 6) Any other means? CMS SUSY 23

24 Remarks on Run2 and Beyond Good LHC duty cycle in 2018; Fills with cm 2 s 1 ; CMS: ~10 fb 1 ; Hadron Collider ( s ) g/q 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 Various improvements and optimizations: Dedicated heavy object tagging by utilizing Deep Learning DeepAK8: tagger for boosted t/w DeepResolved: tagger for resolved top with 3-jet combination Dedicated triggers for compressed-mass spectra scenarios 24

25 Appendix 25

26 Data/MC u / q T u u Challenges with High Luminosity (= PU) E T miss μ e CMS-PAS-JME τ j τ 26

27 CMS-PAS-BTV Tagging Boosted Objects CMS-PAS-JME ΔR~ 2m particle p T 27

28 CMS-PAS-SUS Tau Spelton Pair with Taus Hadronically decayoing tau (τ h ) leptons in tau slepton ( τ) ǁ decay Event with M T2, Δφ(ττ), ΣM T, and/or miss p T Search for OS 2τ 28

29 CMS-PAS-SUS Tau Slepton Pair with Taus m( χ 1 0 )= 1 GeV m( χǁ 0 1 )= 1 GeV m( χǁ 0 1 )= 20 GeV τǁ L m( χǁ 0 1 )= 50 GeV τǁ L τǁ mixed τǁ R 29

30 CMS-PAS-SUS Tau Slepton Pair with Taus τ h + l or e + μ from tau leptom decays Event with Δφ(ττ), ΣM T, and/or p T miss Search for OS 2τ m( χǁ 0 1 )= 1 GeV m( χǁ 0 1 )= 20 GeV m( χǁ 0 1 )= 20 GeV m( χǁ 0 1 )= 30 GeV 30