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Hong-Jian He Tsinghua University Probing New Physics at LHC and Beyond HEP Annual Meeting, Wuhan, April 18-22, 2014.

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Presentation on theme: "Hong-Jian He Tsinghua University Probing New Physics at LHC and Beyond HEP Annual Meeting, Wuhan, April 18-22, 2014."— Presentation transcript:

1 Hong-Jian He Tsinghua University Probing New Physics at LHC and Beyond HEP Annual Meeting, Wuhan, April 18-22, 2014.

2 SM Structure is complete, but.... Recall: situation around 1900 ─ People mis-claimed: Newton Mechanics was complete! So physics reached “the End”, but it was just at start of New Revolutions, in afterwards ─ SR, GR, QM....

3 LHC Status

4 High Energy Physics at Turning Point High Energy Physics at Turning Point New Set of Key Physics Questions LHC New Discovery of H(125GeV) puts leading to

5 New Set of Key Physics Questions Within SM Structure New Set of Key Physics Questions Within SM Structure SM contains 3 kinds of Fundamental Interactions: SM contains 3 kinds of Fundamental Interactions:  1. Gauge Interactions: via Spin-1 Gauge Bosons  2. Yukawa Interactions: via Spin-0 Higgs Boson  3. Higgs Self-Interactions: via h 3 and h 4 Couplings  LHC only has weak sensitivities to hττ, hbb, htt. ─ All other Yukawa + Self couplings fully unknown!! ─ All other Yukawa + Self couplings fully unknown!! ─ Origins of Fermion Masses + Higgs Mass Itself ?? ─ Origins of Fermion Masses + Higgs Mass Itself ??  Quantitative Tests of Type Interactions are Beyond LHC and needs New Colliders are Beyond LHC and needs New Colliders

6 Sensitivity to Higgs Couplings: M.E.Peskin, arXiv: LHC(300/fb) has poor sensitivity to Fermion-Yukawa-Couplings !

7 Model-Independent: Higgs Anomalous Couplings from Effective dim-6 Operators

8 Higgs Anomalous Coupling from Models

9 New Set of Key Physics Questions Beyond SM Structure New Set of Key Physics Questions Beyond SM Structure  SM does not include Gravity Force ! So it cannot explain Dark Energy, Inflation..... So it cannot explain Dark Energy, Inflation.....  85% Matter in the universe is Dark Matter, but SM contains no DM ! but SM contains no DM !  SM with h(125GeV) gives too small Baryon Asymmetry of the universe, in contradiction with observations !  SM cannot account for Neutrino Mass without adding New Particles. New Particles.  ν Mixings fully differ from Quarks. Leptonic CP ?…

10 High Energy Physics at Turning Point Additional Remarks High Energy Physics at Turning Point Additional Remarks  H(125) completes SM spectrum. We enter a New Era where Verification of SM takes 2nd Place to Search for New Forces & Interactions. Search for New Forces & Interactions.  A Mystery concerns Higgs Itself: It gives masses to all SM particles - Why is God Particle as simple as this? Why is Higgs mass sensitive to Heavy Particles in UV ? Why is Higgs mass sensitive to Heavy Particles in UV ?  Higgs itself gives us a New Exp approach: Once SM Higgs is extended, its properties are hardly constrained. It is compelling to tug on this particle until SM breaks !!

11 What LHC-14 at 300/fb Will Do ?  Increase mass reach by a factor ~2 in most channels. Search glunio to ~2TeV, Z’, t’ above 1TeV, …… Search glunio to ~2TeV, Z’, t’ above 1TeV, ……  Make 1st measurement on V V V V Scattering.  Test h gauge couplings, mass, spin, CP to 10% level.  Give 1st measurement on h-t-t coupling.  Measure M W to precision < 10MeV, M t to < 600MeV.  Measure t couplings to Z, W, g, γ with sensitivities increased by a factor 2-5 better than today.  Carry out ISR-based searches for DM particles.  Provide data for new generation of PDFs. ………

12 What HL-LHC at 3/ab Will Do ? What HL-LHC at 3/ab Will Do ?  Increase mass reach by 20-40% for generic New Particle searches; increase a factor-2 in mass reach via EW force searches; increase a factor-2 in mass reach via EW force  Make precise measurement on V V V V Scattering, to probe Higgs sector resonance. to probe Higgs sector resonance.  Test Higgs couplings to 2-10%, 1% for h γγ /hZZ ratio.  Make powerful searches for Extended Higgs Sector.  Measure Rare Decays h μμ,γZ with 100M Higgs bosons.  Measure M W to precision < 5MeV, M t to < 500MeV.  Search for flavor-changing t couplings with 10B t-quarks.  Follow up an earlier discovery at LHC or in DM searches …

13 Circular e + e - Higgs Factory at 240GeV  Offer 10 times higher Luminosity than ILC(240), improve Higgs Coupling measurements by factor 3, and provide Multiple Detectors working at the same time.  Make better measurements than ILC by factor-4 in sin 2 θ eff, a factor-4 in M W, and a factor-10 in M Z. a factor-4 in M W, and a factor-10 in M Z.  Search for rare top coupling via ee t c, t u.  Offer possible improvement of α s by a factor-5 over Giga-Z, to < 0.1% precision.  TLEP350 measures top mass more precisely to ±100MeV.  …………

14 Circular pp Collider at TeV  Give high rates for gg hh production, and measure h 3 coupling to 8% at pp(100TeV) with 3/ab luminosity. h 3 coupling to 8% at pp(100TeV) with 3/ab luminosity.  Sensitively search New Higgs bosons of extended Higgs sector in multi-TeV range.  Significantly improve sensitivity to WW Scattering and multi-weak-boson production. multi-weak-boson production.  Search for WIMP DM Particle up to TeV mass range.  Follow up any discovery at LHC or DM & flavor searches, with further probes for related higher-mass particles. with further probes for related higher-mass particles. Both energy + luminosity matter! Both energy + luminosity matter!  ………… Brock & Peskin, Snowmass-Summary-Rept

15 Circular e + e - : Precision Higgs Machine  e + e - Higgs Factory (240GeV) can more precisely measure Higgs properties than LHC: Mass, J PC, Couplings, especially h-Z-Z, h-b-b, h-τ-τ, h-g-g couplings, and invisible decays. It can also measure h-c-c Coupling, which cannot be carried out at LHC.  Most of important Precision-Higgs-Tests can be already done at HF(240GeV), without ILC500. Higgs self-couplings’ll be probed at Super pp(50-100TeV). M. E. Peskin, arXiv: ILC1(250GeV) & HF( ) can do well !

16 Collider Reach for New Physics Upper Limits on New Particles Reaches at 95%CL Snowmass-Summary-2013

17 Higgs Higgs Factory

18 Testing Higgs Self-Couplings LHC(14TeV) vs pp(50-100TeV) pp hh + X bbγγ h 3 coupling with 50% accuracy.  LHC(14TeV, 3/ab) probe h 3 coupling with 50% accuracy. h 3 coupling with 20% accuracy.  HE-LHC(33TeV, 3/ab) probe h 3 coupling with 20% accuracy. h 3 coupling with 8% accuracy.  pp(100TeV, 3/ab) probe h 3 coupling with 8% accuracy. W. Yao, Snowmass-2013 (arXiv: )

19 Can Circular e  e + (240) Probe h 3 Coupling?  TLEP(240GeV) can measure σ[Zh] to 0.4%. Estimate: Can probe h 3 to 28%. Estimate: Can probe h 3 to 28%.  Recall: HL-LHC probes h 3 to 50%. HL-LHC probes h 3 to 50%. ILC500 probes h 3 to 83%. ILC500 probes h 3 to 83%. M. Mcullough, arXiv:

20 Higgs Gauge Couplings via WW Scattering LHC(14TeV) vs pp(50-100TeV)

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22 Higgs Gauge Couplings via WW Scattering LHC(14TeV, 300/fb) Sensitivity: |Δκ| < 0.2 (2σ level) For recent study, Y.Cui & Z.Han, arXiv:

23 Modify Effective hWW/hZZ Couplings in Einstein Frame:

24 Unitarity Bound on Higgs-Gravity Coupling Bound with Φ = v Bound with large Φ Ren, Xianyu, He, arXiv: [gr-qc]

25 Probe Higgs-Gravity Coupling at pp Colliders W + W + W + W + for WW energies at LHC(14TeV) for WW Energies at pp(50-100TeV) Ren, Xianyu, He, arXiv:

26 Higgs Inflation: Moderate Higgs-Gravity Coupling ξ = O(10 4 ─10) ξ = 10 4 (conventional)ξ = 10 (BICEP2) Ren, Xianyu, He, arXiv: [gr-qc]

27 Origins of Fermion Masses: Probing Yukawa ! All spin-1/2 matter particles have ∝ Masses ∝ Arbitrary Yukawa Couplings: (in SM)

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31 PP(50-100TeV): Direct Probe of b & c Yukawa Couplings J. Ren & HJH

32 Probing New Heavy Higgs States Probing New Heavy Higgs States Higgs WG Rept - SppC

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36 Current WG Report (~200pp) 6 Sub-Reports Very Preliminary

37 Beyond Higgs Boson(125) ?!! We need: Good Colliders + Good Ideas ! Cooperate Exp & Theory !

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39 Sensitivity to Higgs Couplings: M.Klute etal, arXiv: HL-LHC(3/ab) does not improve much on Yukawa Couplings !


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