LLCP at FCC-hh & FCC-he

Transcription

1 LLCP at FCC-hh & FCC-he Sho IWAMOTO [Technion, Israel à Padova, Italia] 27 Aug Fuji-Yoshida Based on hh: Jonathan. L. Feng, S.I., Yael Shadmi, Shlomit Tarem [ ] (collected in FCC-hh report [ ]) he: Kechen Wang, S.I., Monica D Onofrio, Georges Azuelos [17??.?????] (subgroup in BSM@ep collaboration)

2 LLCPs : long-lived charged particles p p 2 /36

3 LLCPs : long-lived charged particles p p 3 /36

4 LLCPs : long-lived charged particles stable LLCP p p 4 /36

5 LLCPs : long-lived charged particles stable LLCP passes the detector like a muon. is much heavier than a muon. Background = muons distinguishable by measuring the mass. = measuring the velocity. 5 /36

6 LLCP searches at LHC Run 2 CMS-PAS-EXO / /36

7 LLCPs : long-lived charged particles in-flight decay LLCP p p 7 /36

8 How to detect in-flight decay LLCP d1 in-flight decay LLCP LLCP d2 Proton electron In-flight decay = disappearing track 3-4 hits in the inner-most tracker and then missing (or a kink if the harder daughter d1 is charged) 8 /36

9 FCC-hh and FCC-he 27 km, 8.3 T, beam = 7 TeV * he-lhc 27 km, 16 T beam = 13.5 TeV FCC-hh km, ~16 T, beam = 50 TeV ( L = 5 10 ab 1 ) (FCC-ee as a potential first step) à CDR in /36

10 FCC-hh and FCC-he Magnet R&D: 20+ years Draft Schedule Considerations Technical Design Phase Strategy Update 2026 assumed project decision Dipole short models SC Magnets Dipole long models 16 T dipole indust. prototypes 16 T dipoles preseries 16 T series production FCC-hh FCC-ee Civil Engineering FCC-hh ring CE TL to LHC LHC Modification Installation + test FCC-hh CE FCC-ee ring + injector Injector Installation + test FCC-ee HE-LHC LHC Removal Installation HE-LHC FCC Study Status and Plans Michael Benedikt 3 rd FCC Week, Berlin, 29 May From M. Benedikt s 3 rd FCC Week, 29 May /36

11 FCC-hh and FCC-he LHC + e - beam = LHeC FCC-hh + e - beam = FCC-he E e = 60 GeV (140 GeV?) from Energy Recovery Linacs s LHeC =2 s FCC-he = TeV 1.73 TeV ( L FCC-he 1 ab 1 ) 11 /36

12 Many activities toward CDR n Mar 2015 : FCC week Washington D.C. n Apr 2016 : FCC week Rome n Jan 2017 : FCC physics CERN n May 2017 : FCC week Berlin n Sep 2017 : LHeC/FCC-eh CERN n Jan 2018 : FCC physics CERN n Apr 2018 : FCC week Amsterdam 12 /36

13 Outline 1. FCC-hh and FCC-he 2. LLCP searches at FCC-hh Ø Motivation: Super-WIMP scenario Ø A new method to reduce BKG Ø Expectation 3. LLCP searches at FCC-he Ø Scenarios of interest: what can we do at FCC-he? Ø Expectation 13 /36

14 2. FCC-hh Jonathan. L. Feng (UC Irvine), S.I., Yael Shadmi, Shlomit Tarem (Technion) [ ] (collected in FCC-hh report [ ])

15 Motivation for FCC-hh n The era of FCC-hh: standard thermal-wimp scenarios à greatly covered. n Elusive cases: Ø degenerate Ø non-standard n An example of non-standard scenario: super-wimp "Physics at the FCC-hh" Report [ ] 15 /36

16 Super-WIMP scenario Feng, Rajaraman, Takayama [ph/ ] SM n Super-WIMP: Ø NLSP slepton SM + LSP gravitino frozen-out thermal relic with h e e! G e+ late-time decay h 2 DM (G) = mg m h2 16 /36

17 Super-WIMP scenario n Super-WIMP: (short-lived) LLCP search target (BBN/CMB constraints are relevant.) 17 /36

18 LLCPs at FCC-hh n LLCPs at FCC-hh LLCPs at LHC Ø same production mechanism; just with a higher energy. l e.g., à Drell Yan process (or from cascade decay) Ø same detection method. l stable à muon-like track but with a larger mass. l in-flight decay à disappearing track. à just an extrapolation of LHC analysis, but a new handle to reduce muon BKG from SM: muon radiative energy loss. 18 /36

19 Muon energy loss in matter Figure from Groom, Mokhov, Striganov, Atom. Nucl. Data Tab. 78 (2001) [also in PDG Review Passage of particles through matter ] 19 /36

20 Muon energy loss in matter Muon radiative energy loss Ø Bremsstrahlung Ø Photonuclear interaction Ø e + - e pair-production Figure from Groom, Mokhov, Striganov, Atom. Nucl. Data Tab. 78 (2001) [also in PDG Review Passage of particles through matter ] 20 /36

21 Muon energy loss in calorimeter Feng, SI, Shadmi, Tarem [ ] calorimeter : approximated by iron (Fe) with 3m thickness. à some of μ (P T > 500 GeV): > 30 GeV energy deposit. Probability > 10 GeV > 20 GeV E loss > 30 GeV muon energy [TeV] [Simulated with GEANT 4] 21 /36

22 Assumptions Feng, SI, Shadmi, Tarem [ ] n Detector Ø similar to ATLAS/CMS Ø β-resolution same as ATLAS (resolution: 2.4%) n Signal: Madgraph5 + Pythia6 + Delphes3 (calculated at the LO) n BKG: Snowmass 2013 BKG set for 100TeV n Pile-up not considered n -selection flow e = reconstructed muon with P T > 500 GeV < < ˆ < 0.95 (from ToF) E loss < 30 GeV n Event selection 22 /36

23 Result: cut flow LLCP selection flow signal Event categorization ( R L = 1 ab 1 ) SM BKG ( R L = 1 ab 1 ) n -selection flow e Eloss reduces = reconstructed 34% of BKG muon with P T > 500 GeV < < ˆ < 0.95 (from ToF) E loss < 30 GeV n Event selection Feng, SI, Shadmi, Tarem [ ] SR 23 /36

24 Result: Expected exclusion limit Feng, SI, Shadmi, Tarem [ ] 24 /36

25 Result: Expected exclusion limit Feng, SI, Shadmi, Tarem [ ] mixing-angle dependence 25 /36

26 Result: Expected exclusion limit Feng, SI, Shadmi, Tarem [ ] mixing-angle dependence 26 /36

27 3. FCC-he Kechen Wang (DESY), S.I. (Technion), Monica D Onofrio (U. Liverpool), Georges Azuelos (U. Montreal, TRIUMF) [17??.?????] (subgroup in BSM@ep collaboration)

28 FCC-he for n FCC-he main targets: Ø PDFs Ø strong coupling n What s more? Ø Higgs & Electroweak physics Ø QCD (heavy quark PDFs) Ø low-x physics (non-linear QCD?) n What s MORE? Any power to New Physics? à BSM ep team 28 /36

29 FCC-he for n BSM ep team [from a talk by Kechen FCC week 2017] 29 /36

30 SUSY models with LLCP (stable / in-flight decay) n Slepton LSP decaying c m m l 100 GeV to ~kev gravitino via tiny R-parity violation 5 m G 1 ev 2, 0.50 m m l 100 GeV [ stable / in-flight decay] 1 ijk n Pure-Wino LSP / Pure-Higgsino LSP [in-flight decay] Ø long-lived because of small m = m W ± m W 0, m H ± m H 0 (Higgsino is more challenging because of smaller cτ) 30 /36

31 However, the simplest scenarios have tiny cross sections; less promising than LHC. n Simplest models: 4-body production; < 1 fb Ø Pure-Wino / Pure-Higgsino LSP disappearing track ( ω `) degenerate in mass Ø Slepton LSP disappearing track (or kink ) R-parity violation or gravitational interaction 31 /36

32 If one more SUSY particles are as light as the LSP, the production greatly enhances. n Introducing co-lsp allows 3-body production Ø Pure-Wino / Pure-Higgsino LSP + left-handed selectron Ø Slepton LSP + Bino (or Wino) 32 /36

33 With 3-body prod., FCC-he may compete w/ LHC. (à good for verification of FCC-hh) n Nominal production cross section (without acceptances / efficiencies) xs[fb] FCC-he; 4-body (pure-wino) With no polarization. Wino LSP scenarios with/without co-production excluded by ATLAS LHeC; 4-body Shaded region is excluded by ATLAS (13TeV, 36/fb) 3-body model assumes mẽl = m GeV LHeC; 3-body mass[gev] LHC14 FCC-he; 3-body (pure-wino + L-selec.) x30 33 /36

34 With 3-body prod., FCC-he may compete w/ LHC. (à good for verification of FCC-hh) n Nominal production cross section (without acceptances / efficiencies) Slepton LSP scenarios with/without co-production LHC14 xs[fb] FCC-he; 3-body (right-handed slepton + Bino) LHeC; 3-body x mass[gev] With no polarization. FCC-he; 4-body (right-handed slepton) 3-body model assumes 34 /36

35 Summary + Discussion: LLCPs at FCC-he n SUSY scenarios with LLCP: Ø Pure-Wino LSP Ø Slepton LSP (with a lighter gravitino / tiny RpV) Ø Pure-Higgsino LSP à too small lifetime; not promising. n Add another sparticle: 3-body production; much more events Ø Pure-Wino LSP + left-handed slepton Ø Slepton LSP + Bino (or Wino) 4-body production; HL-LHC will be better. FCC-he will be competitive with HL-LHC. v Analysis with the proposed detector layout is ongoing. v Any theoretical motivation? v Any other ideas to improve the sensitivity? 35 /36

36 Summary: LLCPs at FCC-hh n 100 TeV FCC-hh mass reach (Drell Yan or ) 0.3ab 1 1ab 1 3ab 1 Exclusion Discovery in TeV n Muon radiative energy loss Ø Bremsstrahlung Ø Photonuclear interaction Ø pair-production à 34% of BKG reduction 36 /36

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38 Velocity measurement 38 /36

39 inner detectors (trackers) calorimeters Ecal Hcal muon spectrometer light hadron heavy [m] 39 /36

40 Mass measurement to distinguish long-lived sleptons momentum & velocity n mass measurement = p & β measurements Ø momentum Ø velocity TOF [time-of-flight] de/dx [ionization energy loss] 40 /36

41 Mass measurement to distinguish long-lived sleptons momentum & velocity n mass measurement = p & β measurements ATLAS muon data: Δβ = 2.4% Ø momentum Ø velocity TOF [time-of-flight] de/dx [ionization energy loss] obs =: ˆ 41 /36

42 Exclusion & Discovery Reach 42 /36

43 Luminosity for exclusion and discovery for LLCP exclusion ] -1 Integrated Luminosity [ab HL-LHC 0.5 FCC-hh ] -1 Integrated Luminosity [ab Slepton mass [TeV] ~ l ~ L l R (θ = 0) (θ = π / 2) θ = HL-LHC for LLCP discovery FCC-hh ~ l L ; for 5σ ~ l L ; for 3σ ~ l R; for 5σ ~ l ; for 3σ Slepton mass [TeV] R 43 /36

44 Momentum resolution 44 /36

45 Momentum resolution for very-large pt ATLAS [ ]; see also [ ] ATLAS 7 TeV results on muon momentum resolution 45 /36

46 Result: LLCP histogram on mass Feng, SI, Shadmi, Tarem [ ] p T p T = p T TeV (too pessimistic?) FCC-hh trk. goal: TeV (Michele Selvaggi s talk) cf. ATLAS 7 TeV commissioning: (ID-barrel, MS-barrel, MS-extbarrel) = (38%, 14%, 1 TeV 46 /36

47 Result: LLCP histogram on mass Feng, SI, Shadmi, Tarem [ ] p T p T = p T TeV (too optimistic) FCC-hh trk. goal: TeV (Michele Selvaggi s talk) cf. ATLAS 7 TeV commissioning: (ID-barrel, MS-barrel, MS-extbarrel) = (38%, 14%, 1 TeV 47 /36

48 HL-LHC 48 /36

49 14 TeV LHC expectation Feng, SI, Shadmi, Tarem [ ] n Detector Ø similar to ATLAS/CMS Ø β-resolution same as ATLAS (resolution: 2.4%) n Signal: Madgraph5 + Pythia6 + Delphes3 (calculated at the LO) n -selection flow n BKG: Snowmass 2013 BKG set for 14 TeV (publicly available) n Event selection n Pile-up not considered 49 /36

50 14 TeV LHC expectation 50 /36

51 14 TeV LHC expectation 14 TeV LHC prospects are also studied in [ ] & [ ] by J. Heisig and J. Kersten. 51 /36

52 HL-LHC CMS-PAS-EXO (sept. 2016) (pb) CMS Projection for 3000 fb s = 14 TeV Gluino (f=10%) Th pred. (NLO+NLL) TOF only Tk Phase2 (4+3) de/dx+tof -1 Tk Phase1 (300 fb ), de/dx+tof -1 at (pb) Mass (GeV/c 2 ) current HL-LHC gluino: 1.7 TeV à 2.2 TeV? stop: 1.2 TeV à 1.7 TeV? stau (GMSB): 660 GeV à 1.2 TeV? stau (DY): 360 GeV à 1.0 TeV? Mass (GeV/c 2 ) (or discovery?) 52 /36

53 Compare with CMS official CMS-PAS-EXO (sept. 2016) Cross section [ab] expected σ UL expected σ UL with x5 BKG σ ~ ~ LO (pp e L e L *) σ ~ ~ LO (pp e R *) e R σ *) with θ =1.1 LO (pp τ 1 τ Slepton mass [TeV] 53 /36

54 LLCP searches at LHC Run /36 54 Drell Yan only: incl. cascade decay (assuming some GMSB model)

55 Why β>0.4? (slepton de/dx) 55 /36

56 Figure from Groom, Mokhov, Striganov, Atom. Nucl. Data Tab. 78 (2001) [also in PDG Review Passage of particles through matter ] /36 56

57 Mean value of Eloss? 57 /36

58 Averaged muon energy loss in 3m iron (internal) Note that the mean is much larger than the median because of its long long long tail. 58 /36

59 de/dx to measure β 59 /36

60 Mass measurement = Measurement of velocity β n TOF : time-of-flight n de/dx : ionization energy loss CMS [ ] 60 /36

61 Extra materials 61 /36

62 Wino-DM lifetime (Ibe, Matsumoto, Sato, ) 62 /36

63 Bino-Gluino co-annihilation (Nagata, Otono, Shirai, ) 63 /36