Report on the LHC2FC workshop (From the LHC to Future Colliders)

Transcription

1 Report on the LHC2FC workshop (From the LHC to Future Colliders) Sven Heinemeyer, IFCA (CSIC, Santander) Barcelona, 05/2009 Sven Heinemeyer, Spain for the ILC, Barcelona,

2 What can we learn from exploring the new territory of TeV-scale physics? How do elementary particles obtain the property of mass: what is the mechanism of electroweak symmetry breaking? Do all the forces of nature arise from a single fundamental interaction? Are there more than three dimensions of space? Are space and time embedded into a superspace? Can dark matter be produced in the laboratory?... Sven Heinemeyer, Spain for the ILC, Barcelona,

3 Hints from electroweak precision data? Global fit to all SM data: [LEPEWWG 09] M H = GeV March 2009 Theory uncertainty α had = α (5) ± ± incl. low Q 2 data m Limit = 163 GeV M H < 163 GeV, 95% C.L. χ Excluded Preliminary m H [GeV] Higgs should be right around the corner! Sven Heinemeyer, Spain for the ILC, Barcelona,

4 Hints from electroweak precision data? Global fit to all SM data incl. direct searches: [GFitter 09] M H = GeV M H < 152 GeV, 95% C.L. χ LEP exclusion at 95% CL Tevatron exclusion at 95% CL G fitter SM Theory uncertainty Fit including theory errors Fit excluding theory errors Mar 09 3σ 2σ 1σ Higgs should be right around the corner! M H [GeV] Sven Heinemeyer, Spain for the ILC, Barcelona,

5 Hints from electroweak precision data? SM vs. CMSSM: (incl. (g 2) µ, B-physics obs., CDM; m t = GeV) [Buchmüller, Cavanaugh, de Roeck, S.H., Isidori, Paradisi, Ronga, Weber, Weiglein (MasterCode) 07] 2 χ arxiv: LEP excluded [GeV] SUSY Higgs should be right around the corner! Sven Heinemeyer, Spain for the ILC, Barcelona, m H

6 Reality: ILC will start in 2020 earliest World of High Energy Physics in the year 2020: Both LHC detectors will have accumulated 300 fb 1 Initial LHC physics goals are accomplished: state compatible with a Higgs found (except in especially designed tricky scenarios) corresponding couplings measured to 10 30% SUSY-like signatures observed (if realized at the EW scale) Extra dimensions or...-like signatures observed LHC may await luminosity upgrade LHC will focus on Improvement in Higgs-like couplings (is it a Higgs?) Improvement of accuracy of new parameters (masses,...) Extension of high mass discovery region Extension of sensitivity to rare processes Sven Heinemeyer, Spain for the ILC, Barcelona,

7 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? Sven Heinemeyer, Spain for the ILC, Barcelona,

8 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? A: NO! The ILC physics case and it has been made many 2 times Sven Heinemeyer, Spain for the ILC, Barcelona,

9 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? A: NO! The ILC physics case and it has been made many 2 times There is a world wide consensus about the ILC (ACFA, ECFA, ICFA, XCFA,...) only some people tend to forget... The EPP2010: strongly recommended the ILC The European Strategy Group: What are (early) LHC results? could be a moving target decisions could be politics driven, not physics driven Equally important: the physics itself Sven Heinemeyer, Spain for the ILC, Barcelona,

10 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? A: NO! The ILC physics case and it has been made many 2 times The ILC will add precision The ILC can make discoveries Complementarity This has been shown for basically all (thinkable) physics aspects: Top/QCD electroweak precision observables Higgs (SM and beyond) Strong electroweak symmetry breaking Supersymmetry (SUSY) Extra dimensions, KK towers... the ILC adds model independence! Sven Heinemeyer, Spain for the ILC, Barcelona,

11 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? A: NO! The ILC physics case and it has been made many 2 times The ILC will add precision The ILC can make discoveries A : But there is more: Complementarity Sven Heinemeyer, Spain for the ILC, Barcelona,

12 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? A: NO! The ILC physics case and it has been made many 2 times The ILC will add precision The ILC can make discoveries Complementarity A : But there is more: Information obtained at the ILC can be used to improve LHC analyses and vice versa Enable improved strategies, dedicated searches Synergy / Concurrency ILC physics case does not rely on Synergy/Concurrency, but it helps! Sven Heinemeyer, Spain for the ILC, Barcelona,

13 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? A: NO! The ILC physics case and it has been made many 2 times A : However... The ILC will add precision The ILC can make discoveries Complementarity Sven Heinemeyer, Spain for the ILC, Barcelona,

14 Reality: ILC will start in 2020 earliest Q: Does the ILC decision have to wait for physics results of the LHC? A: NO! The ILC physics case and it has been made many 2 times The ILC will add precision The ILC can make discoveries Complementarity A : However... due to delays (in all directions) any decision about ILC (or other future colliders) will come anyway after first LHC data will be available early LHC data is important! Sven Heinemeyer, Spain for the ILC, Barcelona,

15 Early LHC data: shaping the future of particle physics Results from the LHC will drastically improve our knowledge of TeV scale physics Complexity and size of possible future accelerator experiments need to plan ahead for future programme ILC status so far: there is a strong physics case for a 500 GeV LC as the next step beyond the LHC, even before we know what the LHC will tell us (consensus documents,...) Early LHC data shape the future of particle physics We will need to reassess our future options in the light of results of the LHC and the Tevatron Sven Heinemeyer, Spain for the ILC, Barcelona,

16 Early LHC results: a possible window of opportunity Exciting results from the early LHC data could open up a window of opportunity for securing a long-term future of the field: possibility to bring a new major facility on the way The particle physics community will have to act quickly and speak with a unanimous voice: We will need to come up with a convincing and scientifically solid conclusion on how to proceed It is useful to discuss possible ways ahead already before the first LHC data become available Sven Heinemeyer, Spain for the ILC, Barcelona,

17 What will we know after the first 10 fb 1 of data at the LHC? Early LHC data: 10 fb 1 Need to discuss possible signatures rather than to assume certain models Whatever the early LHC results will look like, they will definitely rule out many models of new physics But it is expected that there will still be significant room for interpretation concerning the nature of new physics Future Collider comes in! Sven Heinemeyer, Spain for the ILC, Barcelona,

18 Possible scenarios of early LHC results 1. Detection of a state in the first 10 fb 1 of LHC data with properties that are compatible with those of a Higgs boson (either SM-type or non SM-type) + anything else 2. No observation in the first 10 fb 1 of LHC data of a state with properties compatible with a Higgs boson (+ anything else) 3. Detection of new states of physics beyond the Standard Model: leptonic resonances multi-gauge-boson signals missing energy (+nothing, leptons, jets) all other signatures of new states of BSM physics Sven Heinemeyer, Spain for the ILC, Barcelona,

19 First Workshop: The LHC early phase for the ILC (April 12 14, 2007, Fermilab) Focus was on implications for the ILC workshop charge: What could be the impact of early LHC results on the choice of the ultimate ILC energy range and the ILC upgrade path? Could there be issues that would need to be implemented into the ILC machine and detectors design from the start? Could there be cases that would change the consensus about the physics case for an ILC with an energy of about 500 GeV? What are the prospects for LHC / ILC interplay based on early LHC data? Sven Heinemeyer, Spain for the ILC, Barcelona,

20 CERN Theory Institute: From the LHC to Future Colliders (February 9 27, 2009, at CERN) Organizers: Albert De Roeck, John Ellis, Christophe Grojean, S.H., Karl Jakobs, Georg Weiglein, James Wells Goals: Past: Discuss recent physics developments Present: Anticipate near-term capabilities of Tevatron, LHC and other experiments Future: Have discussions on the most effective ways to be prepared for giving science input to plans of the post-lhc era Considered future options for accelerator-based facilities at the TeV scale beyond the first phase of the LHC: SLHC, ILC, CLIC, LHeC, Muon Collider,... Sven Heinemeyer, Spain for the ILC, Barcelona,

21 LHC2FC Workshop Programme A) Future Colliders Series: technology status and physics case B) 4 Working Groups, investigate for different signatures: How well do the observed signatures in the early LHC data constrain the possible physics scenario? What could be the impact of early LHC results on the choice of the next facility and its (ultimate) energy reach and luminosity? What would be the possible implications for the machine and the detector design? How would additional LHC luminosity further constrain / support the scenario and the choice of the future facility? What are the prospects for an interplay with results from the LHC, low-energy experiments and cosmological data? Sven Heinemeyer, Spain for the ILC, Barcelona,

22 WG 1: Detection of a state with properties that are compatible with a Higgs (SM-like or non-sm-like) Convenors: Sally Dawson, S.H., Chiara Mariotti, Markus Schumacher measurement of mass and spin, quantum numbers self-couplings precision top studies and electroweak precision physics... Sven Heinemeyer, Spain for the ILC, Barcelona,

23 WG 2: No Higgs signal No Higgs candidate (yet?) in the first 10 fb 1 at the LHC (+ anything else) Convenors: Georges Azuelos, Christophe Grojean, Mark Lancaster, Georg Weiglein gauge boson self-couplings longitudinal vector boson scattering exotic Higgs scenarios invisibly decaying Higgs scenarios... Sven Heinemeyer, Spain for the ILC, Barcelona,

24 WG 3: Missing energy (+ nothing, leptons, jets) Convenors: Ben Gripaios, Filip Moortgat, Gudrid Moortgat-Pick, Giacomo Polesello measurement of mass and spin, quantum numbers dark matter / connection with cosmology... Sven Heinemeyer, Spain for the ILC, Barcelona,

25 WG 4: Other new signatures Convenors: Tao Han, JoAnne Hewett, Albert De Roeck, Sabine Riemann Leptonic resonances multi-gauge-boson signals measurement of mass and spin, quantum numbers leptoquark-type signatures flavour physics fourth generation-type signatures, exotic quarks TeV scale gravity-type signatures other possible signatures of new physics Sven Heinemeyer, Spain for the ILC, Barcelona,

26 LHC2FC Workshop More than 100 participants, very lively meeting The workshop is not over yet! Reports of the four working groups are currently being prepared (10 20 pages each) The aim is to have a document containing the four working group reports and overall introduction / conclusions sections by middle of June; will be submitted to the arxiv and possibly appear as a CERN Yellow Report Sven Heinemeyer, Spain for the ILC, Barcelona,

27 LHC2FC Workshop More than 100 participants, very lively meeting The workshop is not over yet! Reports of the four working groups are currently being prepared (10 20 pages each) The aim is to have a document containing the four working group reports and overall introduction / conclusions sections by middle of June; will be submitted to the arxiv and possibly appear as a CERN Yellow Report In the following: some examples of issues discussed at the CERN meeting; far from a comprehensive coverage Sven Heinemeyer, Spain for the ILC, Barcelona,

28 WG1: observation of a Higgs-like state [C. Mariotti, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

29 WG1: observation of a Higgs-like state experimental questions: Is it a Higgs boson? What are its mass, spin and CP properties? What are its couplings to fermions and gauge bosons? Are they really proportional to the masses of the particles? What are its self-couplings? Are its properties compatible with the SM, the MSSM, the NMSSM,...? Are there indications that there are more than one Higgs bosons? Are there indications for other new states that influence Higgs physics? Sven Heinemeyer, Spain for the ILC, Barcelona,

30 WG1: observation of a Higgs-like state A light Higgs candidate at the LHC: Initial information from the LHC: From decay to γγ or ZZ ( ) mass From production in WBF or decay to WW ( ), ZZ ( ) gauge coupling is present Expected information from the LHC at high luminosity: determination of coupling ratios at the 20-30% level determination of couplings at the 20-30% level??? test of coupling structure Expectations for the ILC: new state will be produced at the LC in the HZ mode precise mass, coupling and quantum number determination great opportunity for an ILC at s < 350 GeV (+ top physics + GigaZ +...) Sven Heinemeyer, Spain for the ILC, Barcelona,

31 WG1: observation of a Higgs-like state [K. Desch, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

32 WG1: observation of a Higgs-like state [C. Mariotti, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

33 WG1: observation of a Higgs-like state [C. Mariotti, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

34 WG1: observation of a Higgs-like state [C. Mariotti, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

35 WG1: observation of a Higgs-like state [C. Mariotti, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

36 WG2: no observation of a Higgs-like state (yet?) Possible options: There is a Higgs boson (or more than one), but it has non-standard properties that make it difficult to detect: Suppressed couplings to gauge bosons and / or fermions Higgs decays into jets, invisible Higgs decays,... Examples: MSSM with complex parameters, NMSSM, Higgs radion mixing,... There is really no Higgs boson: Technicolour-like models, BESS models,... Higgsless models in extra dimensions Impact on longitudinal vector boson scattering, gauge boson self-couplings: anom. couplings, resonances,... Sven Heinemeyer, Spain for the ILC, Barcelona,

37 WG2: no observation of a Higgs-like state (yet?) [G. Azuelos, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

38 WG2: no observation of a Higgs-like state (yet?) [G. Azuelos, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

39 WG2: no observation of a Higgs-like state (yet?) [G. Azuelos, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

40 WG2: no observation of a Higgs-like state (yet?) [G. Azuelos, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

41 WG3: missing energy [F. Moortgat, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

42 WG3: missing energy: One SUSY example Comparison of electro-weak precision observables with theory: Precision data: Theory: M W,sin 2 θ eff, a µ,... SM, MSSM,... Test of theory at quantum level: Sensitivity to loop corrections, e.g. X SUSY limits on M SUSY Very high accuracy of measurements and theoretical predictions needed Sven Heinemeyer, Spain for the ILC, Barcelona,

43 Indirect constraints on SUSY from existing data? Electroweak precision observables (EWPO)? B physics observables (BPO)? Cold dark matter (CDM)? combination of EWPO, BPO, CDM? Sven Heinemeyer, Spain for the ILC, Barcelona,

44 Indirect constraints on SUSY from existing data? Electroweak precision observables (EWPO)? B physics observables (BPO)? Cold dark matter (CDM)? combination of EWPO, BPO, CDM? EWPO M W : information on m t, m b or M A, tan β or... EWPO (g 2) µ : information on tan β and/or m χ 0, m χ ± and/or m µ, m νµ BPO BR(b sγ) : information on tan β and/or M H ± and/or m t, m χ ± CDM (LSP gives CDM) : information on m χ 0 and m τ or M A or... 1 Sven Heinemeyer, Spain for the ILC, Barcelona,

45 Indirect constraints on SUSY from existing data? Electroweak precision observables (EWPO)? B physics observables (BPO)? Cold dark matter (CDM)? combination of EWPO, BPO, CDM? EWPO M W : information on m t, m b or M A, tan β or... EWPO (g 2) µ : information on tan β and/or m χ 0, m χ ± and/or m µ, m νµ BPO BR(b sγ) : information on tan β and/or M H ± and/or m t, m χ ± CDM (LSP gives CDM) : information on m χ 0 1 and m τ or M A or... combination makes only sense if all parameters are connected! GUT based models,... CMSSM, NUHM1 Sven Heinemeyer, Spain for the ILC, Barcelona,

46 SUSY particle mass determination [MasterCode 08] combine all electroweak precision data as in the SM combine with B physics observables combine with CDM and (g 2) µ include SM parameters with their errors: m t, M Z, α had χ 2 function scan over the full CMSSM/NUHM1 parameter space points samples with MCMC (comparison: L.R. et al.: points) statistical measure: χ 2 function (Frequentist, no priors) final minimum: Minuit χ 2 : 68, 95% C.L. contours preferred CMSSM/NUHM1 parameters LHC/ILC reach Sven Heinemeyer, Spain for the ILC, Barcelona,

47 Best-fit points: CMSSM: m 1/2 = 310 GeV, m 0 = 60 GeV, A 0 = 240 GeV, tan β = 11, µ = 380 GeV, M A = 410 GeV χ 2 /N dof = 20.4/19 (37.3 % probability) very similar to SPS1a :-) NUHM1: m 1/2 = 240 GeV, m 0 = 100 GeV, A 0 = 930 GeV, tan β = 7, µ = 870 GeV, M A = 300 GeV (39 % probability) Sven Heinemeyer, Spain for the ILC, Barcelona,

48 LHC (CMS): [MasterCode 08] [CMS 07] excellent prospects for early LHC data strong support for the ILC Sven Heinemeyer, Spain for the ILC, Barcelona,

49 LHC (CMS): NUHM1 analysis [MasterCode 08] [CMS 07] excellent prospects for early LHC data strong support for the ILC Sven Heinemeyer, Spain for the ILC, Barcelona,

50 Masses for best-fit points: [MasterCode 08] 1000 CMSSM NUHM χ, χ ± χ ~ g ~ ~ q, t L 2 ~ b 1 ~ q ~, b R 2 ~ t ~ g ~ ~ q q L R ~ b 1 ~ t 2 ~ b ± H 0 0 A,H ± χ, χ χ ± H 0 0 A,H ~ t h ~ l L,τ 2 ~ l R,τ 1 ν l χ ± χ, χ h ~ l L,τ 2 ~ l R τ 1 ν l χ ± χ, χ largely accessible spectrum for LHC and ILC see Marcel Vos talk for ẽ production see Olaf Kittel s talk for χ 0 i χ0 j production Sven Heinemeyer, Spain for the ILC, Barcelona,

51 WG4: other signatures [A. de Roeck, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

52 WG4: other signatures [A. de Roeck, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

53 WG4: other signatures [A. de Roeck, LHC2FC 09] Sven Heinemeyer, Spain for the ILC, Barcelona,

54 Conclusions The main future option beyond LHC / SLHC remains a Linear Collider: ILC / CLIC Likely first phase at 500 GeV or below; intense discussions at the workshop Much less activity on the other options ILC performance (machine and detector(s)) & cost will be crucial factors A Workshop Report is in preparation Looking forward to exciting results from the LHC! Sven Heinemeyer, Spain for the ILC, Barcelona,