The Future of Supersymmetry
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- Barnaby Sharp
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1 The Future of Supersymmetry Sreerup Raychaudhuri TIFR HEP Seminar Institute of Physics, Bhubaneswar
2 ...in recent times, supersymmetry has been getting a lot of bad press
3 Supersymmetry Bites the Dust Where Supersymmetry Belongs: In a Coffin SUSY in the Hospital? Is Supersymmetry Dead? Supersymmetry Dealt a Blow? Well that about wraps it up for SUSY? Truant particles turn the screw on supersymmetry Supersymmetry takes an arrow to the knee Is SUSY Dead Yet? The uncertain future of SUSY
4 The Future of Supersymmetry is rooted in the present
5 Aesthetic appeal of SUSY: THE CASE FOR SUSY only way of combining spacetime symmetry w. internal symmetry the only way to combine gravity with other interactions only theory which explains differentiation of bosons and fermions a consequence of the breaking of supersymmetry Practical appeal of SUSY: most natural way of solving hierarchy problem pairwise cancellation of quadratic divergences only theory where a light Higgs boson is predicted naturally fits the 125 GeV Higgs boson perfectly only theory which has a natural dark matter candidate and also has a solution for the cosmological constant electroweak symmetry-breaking has a dynamical origin only way to get gauge coupling unification with one-step breaking
6 Group Theoretic Arguments Haag Lopuszanski Sohnius theorem The only way to evade the restrictions of the Coleman-Mandula theorem is to replace the Lie group of symmetries by a Z 2 graded Lie group supersymmetry
7 Bosons and Fermions mix freely cannot be distinguished SUSY breaks Bosons are Bosons Fermions are Fermions cannot mix with each other Spin-statistics theorem becomes a low-energy effect
8 Mass Stabilization Arguments J. Feng arxiv: Standard Model with f = t : Supersymmetry with f = t :
9 Light Higgs Boson Arguments 91 GeV GeV 135 GeV max Discovery of a GeV Higgs-like boson vindicates what SUSY has always predicted Large stop mass splitting required...
10 Dark Matter Arguments Lepton number (L) and baryon number (B) conservation in the Standard Model are purely accidental they happen because we write the minimum number of possible operators Any bigger symmetry, such as a GUT, will automatically violate these U(1) global symmetries and lead to rapid proton decay SUSY models lend themselves naturally to a global U(1) R-symmetry. When SUSY breaks, this remains as R-parity All SM particles have R-parity +1, all SUSY partners have -1 The LSP is stable and weakly interacting ideal WIMP for dark matter candidate
11 Dark matter must be WIMPS... Bullet Cluster...
12 Electroweak Symmetry Breaking in SUSY S.P. Martin hep-ph/
13 Gauge Coupling Unification in SUSY SUSY Particles
14 Gauge Coupling Unification in SUSY SUSY Particles
15 Such a beautiful theory must have truth in it somewhere Interviewe r Dr. Einstein, it seems that the observations made by the British team of the recent solar eclipse in South America support your theory of general relativity. How would you have felt if your theory had been proven wrong? Then I would have felt sorry for the Lord. The theory is correct.
16 The Only Problem...we have no experimental evidence at all for SUSY particles okay, then they must be heavy
17
18 Little Hierarchy Problem in 3 rd generation N 0 Fine tuning level Max squark mass SUSY around the corner 10 10% 253 GeV 100 1% 800 GeV % 2.53 TeV % 8 TeV % 25.3 TeV % 80 TeV No reason to panic at this stage
19 Collider Searches for SUSY : missing pt
20 Low Energy Searches for SUSY : GIM Violation b u i s V* ib V is i m ( i ) * ib is v V V f
21 21
22 stop mass < 1.5 TeV cmssm NUHM 22
23 Collected constraints theory constraints LEP bound theory + indirect LEP bound theory + indirect + direct LEP bound theory + indirect + direct + Higgs mass LEP bound cmssm NUHM
24 CMS ATLAS Higgs decay constraints
25 The pmssm
26
27 SUSY Dark Matter
28
29 Direct Search:
30 Conclusions Electroweak-scale SUSY remains the best BSM option It was not just around the corner when LHC started B factories have also come up with a blank No reason to despair yet (recall wait for the Higgs) We may have to live with some minor fine-tuning Thank You
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