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  • Slide 1
  • Possibili candidati di materia oscura ai collisori. Antonio Masiero Univ. di Padova INFN, Padova Ricerca di Materia Oscura a LHC, Padova, 22 Aprile 2008
  • Slide 2
  • UNIFICATION of FUNDAMENTAL INTERACTIONS
  • Slide 3
  • THE G-W-S STANDARD MODEL
  • Slide 4
  • Slide 5
  • Slide 6
  • COLLA NUCLEARE
  • Slide 7
  • Slide 8
  • Slide 9
  • The HIGGS BOSON CONDENSATE SOMETHING fills the Universe: it disturbs Weak interactions making them SHORT-RANGED, while it does NOT affect gravity or electromagnetism. WHAT IS IT? Analogy with SUPERCONDUCTIVITY: in a superconductor the magnetic field gets repelled ( Meissner effect) and penetrates only over the penetration length, i.e. the magnetic field is short-ranged source which disturbs are the boson condensates, Cooper pairs. We are swimming in Higgs Boson Condensates its value at the minimum of its potential determines the masses of all particles!
  • Slide 10
  • WHY TO GO BEYOND THE SM OBSERVATIONAL REASONS HIGH ENERGY PHYSICS (but A FB ) FCNC, CP NO (but evidence >3 for NP in b - s transitions,,,) HIGH PRECISION LOW-EN. NO (but (g-2) ) NEUTRINO PHYSICS YE m 0, 0 COSMO - PARTICLE PHYSICS YE (DM, B cos m, INFLAT., DE) Z bb NO YES THEORETICAL REASONS INTRINSIC INCONSISTENCY OF SM AS QFT (spont. broken gauge theory without anomalies) NO ANSWER TO QUESTIONS THAT WE CONSIDER FUNDAMENTAL QUESTIONS TO BE ANSWERED BY FUNDAMENTAL THEORY (hierarchy, unification, flavor) NO YES Strong CP violation?
  • Slide 11
  • MICROMACRO PARTICLE PHYSICSCOSMOLOGY GWS STANDARD MODEL HOT BIG BANG STANDARD MODEL HAPPY MARRIAGE Ex: NUCLEOSYNTHESIS BUT ALSO POINTS OF FRICTION -COSMIC MATTER-ANTIMATTER ASYMMETRY -INFLATION - DARK MATTER + DARK ENERGY OBSERVATIONAL EVIDENCE FOR NEW PHYSICS BEYOND THE (PARTICLE PHYSICS) STANDARD MODEL
  • Slide 12
  • Slide 13
  • Present Observational Evidence for New Physics NEUTRINO MASSES DARK MATTER MATTER-ANTIMATTER ASYMMETRY INFLATION
  • Slide 14
  • INDICAZIONI DI NUOVA FISICA AL DI LA DEL MODELLO STANDARD MASSA DEI NEUTRINI ESISTENZA DI MATERIA OSCURA NON COSTITUITA DALLA SOLITA MATERIA (protoni, neutroni) ASIMMETRIA COSMICA TRA MATERIA E ANTIMATERIA: ESISTENZA DI UNA NUOVA SORGENTE DI VIOLAZIONE DI CP OLTRE A QUELLA PREVISTA DAL MODELLO STANDARD DOMANDE FONDAMENTALI A CUI IL MODELLO STANDARD NON RISPONDE: - UNIFICAZIONE DELLE FORZE FONDAMENTALI - MASSE E MESCOLAMENTI DEI FERMIONI - STABILITA DELLA SCALA DI ENERGIA A CUI I BOSONI W e Z PRENDONO MASSA ( circa 100 GeV)
  • Slide 15
  • Bilancio energetico dellUniverso
  • Slide 16
  • WMAP3 + small scale CMB exps (BOOMERang, ACBAR, CBI ans VSA) + Large-Scale Structures (SDSS,2dFCRS) + SuperNova ( HST/GOODS, SNLS) CONSISTENT WITH BARYON DENSITY DETERMINATION FROM BIG BANG NUCLEOSYNTHESIS
  • Slide 17
  • DM: the most impressive evidence at the quantitative and qualitative levels of New Physics beyond SM QUANTITATIVE: Taking into account the latest WMAP data which in combination with LSS data provide stringent bounds on DM and B EVIDENCE FOR NON-BARYONIC DM AT MORE THAN 10 STANDARD DEVIATIONS!! THE SM DOES NOT PROVIDE ANY CANDIDATE FOR SUCH NON- BARYONIC DM QUALITATIVE: it is NOT enough to provide a mass to neutrinos to obtain a valid DM candidate; LSS formation requires DM to be COLD NEW PARTICLES NOT INCLUDED IN THE SPECTRUM OF THE FUNDAMENTAL BUILDING BLOCKS OF THE SM !
  • Slide 18
  • THE RISE AND FALL OF NEUTRINOS AS DARK MATTER Massive neutrinos: only candidates in the SM to account for DM. From here the prejudice of neutrinos of a few eV to correctly account for DM Neutrinos decouple at ~1 MeV ; being their mass

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