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Particle Theory in Innsbruck

Particle Theory in Innsbruck. Steven Bass / Innsbruck. RECFA, March 26 2004. 1. Subatomic Theory in Innsbruck. HEP Theory: Steven Bass (Lise Meitner Fellow, FWF, Visiting Prof.)

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Particle Theory in Innsbruck

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  1. Particle Theory in Innsbruck Steven Bass / Innsbruck RECFA, March 26 2004

  2. 1. Subatomic Theory in Innsbruck • HEP Theory: Steven Bass (Lise Meitner Fellow, FWF, Visiting Prof.) • QCD: Spin Structure of the Proton, Heavy Quarks, Confinement, Eta-prime Physics, Structure of light-mass Exotic Mesons (JPC=1-+) • [Writing Rev Mod Physics ``The Spin Structure of the Proton´´] • Electroweak baryogenesis  (spin independent) topological condensate in the Early Universe (Interface with Astrophysics [S Schindler talk]) • Origin of mass and spin (related issues in Black Hole Physics) • Connections with programmes elsewhere include: • CERN (ATLAS, TH-EP Collab. with A De Roeck, CMS) • JLAB/CSSM (AW Thomas, R Crewther: longstanding collab.) • BNL (A Deshpande on polarized colliders: RHIC, e-RHIC/EIC) • SLAC (S Brodsky on polarized photon structure function &tc) • Nuclear Physics Labs working on eta(-prime) physics: COSY-11 (W Oelert, P Moskal), GSI (P Kienle @IMEP), … • (1999+): 22 invited talks at Int. Meetings, including 17 in plenary session • Co-Chair with C Jarlskog + T Nilsson (Nuclei and the Standard Model topical conference at INPC, Göteborg SE, 04), • Scientific Prog. Cttee (Physics at LHC, Vienna, 04)

  3. 2. Field Theory Group • A. Prof. Gebhard Grübl, • 2 PhD students (Sabine Kreidl, Stefan Mair), 3 MSc students (Margarete Meisinger, Markus Penz, Michael Ruggenthaler) @ March 04; 6 completed M Sc´s (2000-04) • Bohmian mechanics and foundations of QFT • Search for quantum theory of closed systems without external measurement intervention, i.e. quantum theory without observers. • Coordinate free form of Schrödinger Eqns on Galilean space times • Do Bohmian trajectories for Klein´s paradox show particle creation ? • Bohmian mechanics of interferometry and decoherence • What is the probability to detect a particle within a given space-time volume ? Detection probability without state reduction and quantum Zeno paradox. Time of arrival of Bohmian flow. • Does local energy momentum conservation in relativistic quantum mechanics lead to a relativistic Bohmian flow ? • Generalizing some NO GO theorems concerning the quantum measurement problem

  4. QCD: The Spin Structure of the Proton QCD: (Spin) Structure of the proton Confinement (physical interpretation of Gribov confinement) Relation to axial U(1) problem [etaprime mass, light-mass exotics, gluon topology, instantons, …] [36 primary research papers]  Structure of the Proton as a Lab for Non-perturbative physics Very interesting in itself (!) *plus* primary test of non-perturbative particle theory before unexpected surprises at the LHC (strong e-weak symmetry breaking, WW, …) ``WHERE THERE IS NOMYSTERY THERE IS NORELIGION´´ (Rev. Septimus Harding in Barchester Towers) SM Higgs sector (many parameters of unknown dynamical origin, 15 before neutrino masses)  Hierachy problem (SUSY, Large Extra-Dimensions),  Strong CP (axions),  Cosmological Constant (Universe size of a football!), … Many of the things we vigorously seek are postulated to explain problems that arise from a (perturbative) elementary Higgs • SOON TO START MEETING DATA !!! be prepared for something non-perturbative !

  5. Polarized DIS Measure g_1 spin structure function First moment  Sigma = 0.2 – 0.35 ``Missing spin´´ Many exciting ideas being checked in experiment: Gluon polarization Delta g (COMPASS, RHIC, EIC), Valence and Sea quark polarization (Jlab, HERMES, COMPASS, RHIC), … , Connection to Drell-Hearn-Gerasimov sum-rule, … Close contacts with EP groups Spawned vast EP programme at BNL, CERN, DESY, JLab, SLAC, … PLANS FOR NEW FACILITIES: JLAB @ 12 GeV, e-RHIC [SDB, De Roeck, Deshpande] Key result [SDB]: Transition from current to constituent quarks  Polarized Condensate (x=0) Testable through nu-p elastic scattering The Spin Structure of the Proton

  6. Transition between current and constituent quarks Anomalous glue in DSB Can form ``polarized condensate´´ inside a proton  some of the spin sits at x=0 In Regge language: „fixed pole with non-polynomial residue in the spin dependent, real part of forward Compton amplitude“  Subtraction constant correction in dispersion relation (from circle at infinity)  There is no EJ sum rule for pDIS (!) but there is an EJ sum rule for nu-p elastic scattering Direct probe of the spin !!! (Interest in the US, R Tayloe et al) Test current to constituentquark transition!!! Elastic neutrino proton scattering low duty cycle neutrino beam Carbon target Heavy Quarks (Simultaneous Decoupling) [NLO Calculation: SDB,Crewther,Steffens,Thomas, PRD 02,03] Spin structure of the proton

  7. Large etaprime mass - anomalous glue in non-p QCD Relation to proton spin problem Look at etaprime – hadron interactions … Eta-(prime) production at threshold [Bass, PLB] COSY-11/CELSIUS : (pnpn eta´)/(pppp eta´) GSI : eta´s in nuclei … Light mass exotics … (CERN and BNL) Major importance in new Jlab and GSI projects Lattice cannot get right (mass few-100 MeV too big) BS calculation with U(1) extended ChiralLagrangian [Bass, Marco 02] Like sigma meson in nuclear physics Etaprime phenomenology

  8. Cosmology: Electroweak baryogenesis  topological condensate in the Early Universe • Anomalous commutators + electroweak baryogenesis  topological condensate in the Early Universe • Condensate has spin independent component • (probably) survives cooling to present times!! • [SDB, hep-ph/0403219] • Possible Application to Cosmology … • *** Same fundamental physics which can give you a ``subtraction at infinity´´ correction to the proton spin sum-rule in QCD *** • Generalization of the Crewther current problem in axial U(1) dynamics

  9. Future: What are Spin ? Mass ? • Black Holes (Large Extra Dimension models  perhaps see at LHC, FNAL, CLIC,…) • Famous information paradox • Well defined quantum information goes into BH • BH evaporates through (black body) thermal Hawking radiation… • Information is missing unless some new physics (HEP meets gravity) • Could (in principle) test with polarized beams at CLIC, TESLA, (LHC)!!

  10. Summary: important and relevant to many experimental programmes at major world Labs in Subatomic Physics

  11. Experiments motivated by TH • Key TH results and new experiments: • High energy part of the GDH sum rule (Jlab, SLAC, EIC) • Semi inclusive DIS  quark sea (HERMES, COMPASS, EIC) • Gluon polarization  jets (EIC) • Polarized condensate  neutrino-proton elastic (FNAL ?) • Real photon spin sum-rule  (CLIC, TESLA) • Etaprimes at threshold  COSY, GSI, JLab • Light-mass exotics  BNL, CERN, GSI, Jlab • Topological condensate in early Universe  Cosmology • Black Holes  CLIC, LHC, TESLA, FNAL

  12. 21st century physicist !Celine (born 18/08/03)

  13. Ideal place for a European Aspen! • Kitzbühel … • Work in progress …

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