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WHAT BREAKS ELECTROWEAK SYMMETRY ?

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Page 1: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

WHAT BREAKS

ELECTROWEAK SYMMETRY ?

Page 2: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

We shall find the answer in experiments at the LHC?

Most likely it will tells us a lot about the physics beyond the SM

Page 3: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

Electroweak symmetry breaking in the SM by the Higgs sector (renormalizable lagrangian)

Page 4: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

SU(2)xSU(2) global symmetry of V :

Properties of the Higgs potential crucial forthe electroweak theory:

Spontaneously broken to the diagonal subgroup SU(2)

Page 5: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 6: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

The Higgs mechanism then ensures that the Goldstone bosons become the longitudinal modes of the gauge bosons W,Z which acquire masses.

Renormalizability not crucial for EWSB

But crucial for ensuring unitarity of e.g. WW scattering by exchange of one physical Higgs particle h

Page 7: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 8: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 9: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 10: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 11: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

INDEED,

In the Standard Model, the EWSB is described butnot explained

Can we better understand the Fermi scale? e.g. calculate it in terms of some more fundamental parameters?

The hierarchy problem of the Standard Model.

Page 12: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
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Page 14: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 15: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

SUPERSYMMETRY ------MANY VIRTUES

Higgs sector of the MSSM:two Higgs doublets;

Page 16: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

Fermi scale calculated in terms of the soft supersymmetry breaking parameters; generated by quantum corrections to the Higgs potential due to the large top quark mass(Ibanez, Ross)

The lightest physical scalar has similarproperties as the Higgs particle in the SM;

Page 17: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 18: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 19: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 20: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 21: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 22: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

DOUBLE PROTECTION FOR THE HIGGS POTENTIAL

SUPERSYMMETRY PLUS LOW ENERGY GLOBAL SYMMETRY;

NO STRONGLY INTERACTING NEW PHYSICS

Page 23: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 24: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 25: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

Prediction – new fermionic states needed by global symmetry,

e.g. new top quark around 1 TeV

Page 26: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

Non –supersymmetric „solutions” to the origin of the Fermi scale.

Revival of those approaches inspired by various theoreticalideas (extra dimensions, AdS/CFT correspondence, deconstruction,…

General picture –new strong interactions that provide a low-scale cut-off to the (non-renormalisable) electroweak theory and are responsible forelectroweak symmetry breaking

Page 27: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

Well-known example : rescaled QCD (technicolour)

Page 28: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 29: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 30: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 31: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 32: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 33: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 34: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 35: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 36: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 37: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

Barrel organ: the power source is commonly assumed to be a crank, turned by the operator or by his monkey.

A barrel organ player has been asked how to compose good music.

Just smoothly turn the crank, he replied.

CONCLUSION

Page 38: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

Supersymmetry – elementary scalars

Minimal supersymmetric model – renormlizable extension of the SM

UV behaviour improved due to fermion-boson cancellations;

Superpartner masses- cut off in the SMHiggs potential

Page 39: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 40: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

The impact of physics beyond the Standard Model on precision electroweak data can be studied in a modelindependent way by adding to the SM lagrangian higher dimension operators

Page 41: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 42: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 43: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 44: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 45: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 46: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

In the Standard Model(with a Higgs particle –renormalizable theory) from the fits to LEP data we get

Page 47: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 48: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 49: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 50: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the
Page 51: WHAT BREAKS ELECTROWEAK SYMMETRY ?. We shall find the answer in experiments at the LHC? Most likely it will tells us a lot about the physics beyond the

LHC Heavy Ion Physics Lecture 5: Jets, W, Z, photons...T jets, γ/ W/Z, quarkonia at the LHC energy, use hard probes produced with the collision. 5 Three types of hard probes Electroweak

Electroweak Measurements at the LHC

Introduction to Electroweak theory and Higgs-boson …oleari/public/Higgs_LHC.pdfIntroduction to Electroweak theory and Higgs-boson physics at the LHC CarloOleari Universita` di Milano-Bicocca,

Electroweak Theory

Electroweak Baryogenesis: Electric dipole moments, the LHC, and the sign of the baryon asymmetry

Electroweak Physics at the LHC Precision Measurements and New Physics

Electroweak Physics at the LHC – Introductory Lecture · Universitat Wien, October 2007¨ Stefan Dittmaier (MPI Mu¨nchen), Electroweak Physics at the LHC – Introductory Lecture

Threshold Resummation for Electroweak Gauge Boson Pair at the LHC

Electroweak physics at the LHC with ATLAS APS April 2003 Meeting – Philadelphia, PA Arthur M. Moraes University of Sheffield, UK (on behalf of the ATLAS

Supersymmetry Breaking and Gauge Mediation arXiv:1001 ... · physics, “supersymmetric technicolor,” where a technicolor force dynamically breaks both supersymmetry and the electroweak

Electroweak precision observables in the LHC epoch

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Electroweak Phase Transition, Scalar Dark Matter, & the LHC

Electroweak Symmetry Breaking at the Tevatron, the LHC and the Linear Collider

Tevatron Electroweak Results And Electroweak Summary

TheglobalStandard Modelfit to electroweak precisionmoriond.in2p3.fr/QCD/2009/TuesdayAfternoon/Stelzer.pdf · The Electroweak Fit ¾SM predictions of electroweak precision observables

Minimal Electroweak Scale Cosmology and the LHC M.J. Ramsey-Musolf Wisconsin-Madison NPAC Theoretical

QCD challenges at the LHC · 2007-04-18 · parton distributions electroweak parameters LHC parton luminosity Precise prediction for Higgs production new physics processes their backgrounds

Electroweak and top mass studies for the LHC

Electroweak Phase Transition, Scalar Dark Matter, & the LHC M.J. Ramsey-Musolf Wisconsin-Madison NPAC

Electroweak Sudakov corrections to New Physics searches at the … New Physics searches. ELECTROWEAK SUDAKOV CORRECTIONS TO NEW PHYSICS SEARCHES AT THE LHC AND FUTURE HADRON COLLIDERS

The Physic of LHC - Italo-Hellenic School – Lecce – May 2004 Alessandro Ballestrero 1 Electroweak Physics at the LHC PHASE Monte Carlo Boson Boson Scattering

Dynamical Electroweak Breaking @ LHC

WHAT BREAKS ELECTROWEAK SYMMETRY ?

Electroweak Physics at the LHC Precision Measurements and New Physics PY898: Special Topics in LHC Physics By Keith Otis 4/13/2009

Electroweak physics at LHC an introduction to the Standard ...personalpages.to.infn.it/~gambino/lhc2.pdf · Naturally of O(1%), δs2 w≈ 0.002 exp constraints very weak Different

Electroweak Symmetry Breaking in Light of LHC Results

Spear-fishing at the LHC: Using Electroweak Bosons to … · 2010. 4. 14. · April 14, 2010 Spear-fishing at the LHC -- UVA HEP Seminar 29 Electrons will put some signal into the

Electroweak Physics

QCD at hadron collidersandreas/FTTA/VDelDuca.pdf · parton distributions electroweak parameters LHC parton luminosity Precise prediction for ... In proton collisions at 14 TeV, and

Electroweak physics and the LHC an introduction to the Standard Model Paolo Gambino INFN Torino LHC School Martignano 12-18 June 2006

ElectroWeak Physics at LHC Kajari Mazumdar Tata Institute of Fundamental Research, Mumbai, India BSM@LHC, IACS, Kolkata January, 2009

V + jet production at the LHC: ELECTROWEAK PRECISION · Outline 1 Introduction 2 Status of Theory Predictions QCD Corrections Electroweak Corrections 3 Details of the Calculations