Presentation on theme: "SUSY 3 Jan Kalinowski. J. KalinowskiSupersymmetry, part 32 Outline Linear Collider: why? Precision SUSY measurements at the ILC masses, couplings, mixing."— Presentation transcript:
J. KalinowskiSupersymmetry, part 32 Outline Linear Collider: why? Precision SUSY measurements at the ILC masses, couplings, mixing angles, CP phases, Towards reconstructing the fundamental theory the SPA Convention and Project Summary
J. KalinowskiSupersymmetry, part 33 After discovering SUSY at LHC Many burning questions will arise: is it really SUSY? (measurement of quantum numbers) how is it realized? (MSSM, NMSSM, …) how is it broken? ILC will be indispensable to answer these questions! Make full use of the flexibility of the machine: - tunable energy - polarized beams - possibly e - e - and collisions 500 200 1000 3000 Sobloher
J. KalinowskiSupersymmetry, part 34 An intense R&D process since 1992 Huge world-wide effort to be ready for construction in 2009/10 (Global Design Effort GDE) ICFA parameter document: The baseline: - e + e - LC running from M Z to 500 GeV, tunable energy - e - /e + polarization - at least 500 fb -1 in the first 4 years Upgrade: to ~ 1 TeV 500 fb -1 /year Options : - GigaZ (high luminosity running at M Z ) - , e, e - e - collisions Choice of options depending on LHC+ILC physics results The International Linear Collider
J. KalinowskiSupersymmetry, part 35 0.Top quark at threshold measure its mass, verify its couplings The ILC physics case (LHC/ILC study group, `Weiglein et al.) LHC + LC data analysed together synergy! 1. Higgs ‘light’ (consistent with precision EW) verify the Higgs mechanism is at work in all elements ‘heavy’ (inconsistent with precision EW) find out why prec. EW data are inconsistent 2. 1.+ new states (SUSY, ED, extra Z’, little H,...) measurements of new states: masses, couplings infer properties of states above kinematic limit 3. No Higgs, no new states find out why precision EW data are inconsistent look for threshold effects of strong/delayed EWSB
J. KalinowskiSupersymmetry, part 36 Masses Two methods to obtain absolute sparticle masses: In the continuum At the kinematic threshold Martyn smuons:
J. KalinowskiSupersymmetry, part 37 Masses If a double cascade occurs, the intermediate state can be fully reconstructed e.g. Assuming neutrino masses known to some extent two LSP 4-momenta => 8 unknowns 4 mass relations + E,p conservation => 8 constraints LSP momenta can be reconstructed 4-momentum of the intermediate particle (here slepton) can be measured! So if you are used to think that a sparticle is just an edge or an end-point, change your mind – it can be a peak! Berggren
J. KalinowskiSupersymmetry, part 38 Couplings and mixings EW gauge and Yukawa couplings can be probed in e.g. Freitas et al
J. KalinowskiSupersymmetry, part 39 Charginos + neutralinos Including masses and polarized cross sections for light neutralinos: Now ask your LHC friends to look for => crucial test of the model Desch, JK, Moortgat-Pick, Nojiri, Polesello Feeding info on m( ) back to ILC => improved accuracy
J. KalinowskiSupersymmetry, part 310 Neutralino couplings also the equality of EW gauge and Yukawa couplings can be tested with polarized beams In these analyses sleptons assumed to be seen at ILC and measured. What if all sfermons heavy, like in focus-point or split SUSY? Choi, JK, Moortgat-Pick, Zerwas
J. KalinowskiSupersymmetry, part 311 Expectations at LHC: decay dominates, but huge background from top production other squarks accessible, but low statistics, BG,.. => m=50 GeV large gluino production, dilepton edge clearly seen, measure Heavy sfermion case Focus-point inspired case sfermions ~ 2 TeV only stop 1 ~1.1 TeV Expectations at ILC 500 GeV large production, measure its mass precisely very small cross section for neutralinos masss from decay + LHC Desch, JK, Moortgat-Pick, Rolbiecki, Stirling
J. KalinowskiSupersymmetry, part 312 Heavy sfermion case FB asymmetry very sensitive to sneutrino mass, Z Desch, JK, Moortgat-Pick, Rolbiecki, Stirling obtain sneutrino mass distinguish models (e.g. focus point SUSY from split SUSY) A FB Decay lepton FB asymmetry => Even a partial spectrum can tell a lot…
J. KalinowskiSupersymmetry, part 313 Majorana and CP of neutralinos Can be probed in neutralino pair production at threshold neutralino decay spectrum near the end-point neutralino production decay after Fierz-ing selectron exchanges + Production: Decay: ( intrinsic CP ) If CP conserved, in non-relat. limit for production for decay
J. KalinowskiSupersymmetry, part 314 Majorana and CP of neutralinos CPC: if (12) and (13) in S-wave (23) must be in P-wave otherwise CP violated if => P-wave if => S-wave 1. Production at threshold JK 2. Compare production of (12) with decay of 2->1 S.Y.Choi CPC: if production in S-wave decay must be in P-wave otherwise CP violated
J. KalinowskiSupersymmetry, part 315 e and options Create HE photon beam by Compton back-scattering laser light on electrons Ginzburg, Kotkin, Serbo, Telnov Photons retain ~90% of electron beam energy almost 100% conversion – no loss of luminosity
J. KalinowskiSupersymmetry, part 316 e example important SM background from can be considerably suppressed by taking right-handed electron beam Illian, Monig ’05 signal E (GeV) N Assume that LSP mass=100 GeV and already measured => higher reach in selectron mass
J. KalinowskiSupersymmetry, part 317 examples 1.very useful for Higgs boson studies - higher kinematic reach - investigate CP using polarized beams 2. Measure tan (for moderate to large values) - important parameter - notoriuosly difficult to determine Choi, JK, Lee, Muhlleitner, Spira, Zerwas
J. KalinowskiSupersymmetry, part 318 Cosmology connection: benchmarks How well can be predicted from LHC/ILC depends on model for NP American LCC + Snowmass05 benchmark points Peskin, LCWS06
J. KalinowskiSupersymmetry, part 319 LCC2 Squarks and sleptons heavy, relevant param. M 1, M 2, tan J. Alexander et al. LHC alone allows multiple solutions Need to know gaugino- higgsino mixing angle can be measured at ILC ILC resolves measured at LHC
J. KalinowskiSupersymmetry, part 320 LCC2: cross-checks, predictions rate of from DM annihilation in the galactic center, or using measured rate determine the DM density neutralino-proton cross section for direct DM search experiments, or using measured cross section determine the flux of DM With the LSP properties determined, calculate
J. KalinowskiSupersymmetry, part 321 The LHC will start testing cosmology. other LCC points In some cases the LC will be invaluable.
J. KalinowskiSupersymmetry, part 322 Towards reconstructing SUSY: Supersymmetry particles will be discovered at the LHC Future ILC will provide additional precision data on masses and couplings Will everybody be happy? We would like to know the relation of the visible sector to the fundamental theory: what is the origin of SUSY breaking ? what is the role of neutrinos ? is it related to the theory of early universe ? how to embed gravity ? etc., etc. Probably we won’t have a direct experimental access to these questions But SUSY is a predictive framework ! We can analyse precision data and state how well within some specific SUSY/GUT model the relation of observable to fundamental physics can be established You may ask: who cares about precision ??
J. KalinowskiSupersymmetry, part 323 Remember Tycho Brache ? from W. Kilian
J. KalinowskiSupersymmetry, part 324 Practical questions How precisely can we predict masses, cross sections, branching ratos, couplings etc. ? many relations between sparticle masses already at tree-level, much worse at loop-level no obvious choice of renormalizaton scheme Goals of the SPA Project Lagrangian parameters not directly measurable some parameters are not directly related to one particular observable, e.g., tan , fitting procedure,.... What precision can be achieved on parameters of the MSSM Lagrangian ? unification of couplings, soft masses etc.??? which SUSY breaking mechanism ?? Can we reconsruct the fundamental theory at high scale ?
J. KalinowskiSupersymmetry, part 325 http://spa.desy.de/spa The SPA project is a joint study of theorists and experimentalists working on LHC and Linear Collider phenomenology. The study focuses on the supersymmetric extension of the Standard Model. The main targets are High-precision determination of the supersymmetry Lagrange parameters at the electroweak scale Extrapolation to a high scale to reconstruct the fundamental parameters and the mechanism for supersymmetry breaking SPA report, The SPA convention and the SPA Project are described in the SPA report, Eur.Phys.J.C46:43-60,2006 [arXiv:hep-ph/05113444]. Spiritus movens: Peter Zerwas
J. KalinowskiSupersymmetry, part 326 The Document More than one ‘astronomer’ involved Please join in !!!!
J. KalinowskiSupersymmetry, part 327 Summa summarum Supersymmetry has been motivated as a way to stabilize the hierarchy At present: no sign, but not excluded either If true, exciting times at near-future colliders Precision measurements will be necessary to reconstruct the theory Once seen and studied, it may provide a telescope to physics at GUT/Planck/string scales