Teilchenphysik – ohne Beschleuniger und Kosmologie

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Teilchenphysik – ohne Beschleuniger und Kosmologie. 31.5.07 Sommersemester 2007. 2. CP-Verletzung. H.W. Wilschut. P. C. T. matter. anti-matter. time   t ime. mirror image. Time reversal violation can be measured at low energies. - PowerPoint PPT Presentation

Text of Teilchenphysik – ohne Beschleuniger und Kosmologie

  • Teilchenphysik ohne Beschleuniger und Kosmologie

    31.5.07Sommersemester 2007

  • 2. CP-Verletzung

    Neutronenphysik

  • 3. Symmetries and the World according to Escher H.W. Wilschutstartidentical to startanti-particle particle e+ e-

    Neutronenphysik

  • BABAR 2001

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  • 3. Prinzip: CP-Verletzung(P - known)P-+elementary particlespinEDMT+-(CP big deal)CP TS. Paul, TUM

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  • ILL: the EDM experiment

    Neutronenphysik

  • Final Sussex-RAL-ILL result(C.A. Baker et al. PRL 97(2006) 131801)| dn | < 2.9 x 10-26 ecm (90% CL)use of 199Hg co-magnetometerd(199Hg) < 8.7 10-28 ecm

    Neutronenphysik

  • EDM: PSIF overall = 100

    Neutronenphysik

  • The PNPI experimentPolarize neutrons || B0 while filling the bottleApply B(wt) B0 to get neutron spin to B0Wait for a time T (~100 s): spin precesses about B0Apply B(wt) to get neutron spin || to B0; if w wL = (w - wL )T Analyze polarization: P = P0 cos()EDM

    Neutronenphysik

  • Improvements higher degree of polarization triple polarizers: a = 0.75 higher electric field E - new material (CERAN): E = 10 kV/cm more neutrons N - FRM II + UCN source, more efficient neutron guides longer storage time T - better coating, better stability of B0: T 150 s Systematic errors: stable B0 (3fT!) - 3He magnetometer with SQIDs (W. Heil, Mainz), better shielding, polarization and analysis with the same arrangementMainly performed by the group at PNPI (V. Lobashev et al.):official collaboration agreement with TUM

    Neutronenphysik

  • berblick zur die Sensitivitt von NeutronexperimentenEDM: Energy: E ~0.000 000 000 000 000 000 000 1eV = 10-22 eVn-Ladung: Impuls: p/p ~ 10-11 (Winkelauflsung von 1 auf 10m)Feinstrukturkonstante / ~ 10-8 (Messung von: nvn)

    Quark-Mischung Vud ~ 7 x 10-4

    Lebensdauer / ~ 10-3

    Gravitation und QM g/g ~ 10-2

    Neutronenphysik

  • EDM Strong CP problemAxion als pseudoskalares Teilchen

    Neutronenphysik

  • Axion limits 2007PVLASUCNother limitsBaeler et al.Westphal, Baeler, H.A. arXiv:hep-ph/0703108

    Neutronenphysik

  • 2. Prinzip: Mischung der Quarks-Zerfall: ~ GF2n-Zerfall:~ 0.95. GF2 = cos2C. GF2K-Zerfall: :~ 0.05. GF2 = sin2C. GF2Quarkmischung ist Rotation im Flavour-Raum (Null-Summe)CKM-Matrix ist unitr!

    Neutronenphysik

    |Vud|2 + |Vus|2 + |Vub|2 = 1-

  • Unitarity Check: The Quark Mixing CKM MatrixParametrization: 3 angles, and a phase

    A, , are real

    Neutronenphysik

  • Unitarity Check II: PDG: = 59 13, = 24 4

    Neutronenphysik

  • Unitarity Check IIdsfVud= 1 - 2/2From A. Buras, Munich

    Neutronenphysik

  • Unitarity check

    Mixing of quarks = rotation in flavor-space:

    Test in first row: |Vud|2 + |Vus|2 + |Vub|2

    cos2 + sin2 + 0 < 1?

    : Cabibbo

    95%5%0.00001%VubVusVud

    Neutronenphysik

  • Situation 1995 - 2004

    Neutronenphysik

  • The PDG feels it has the right to redefine anything it wants

    Is there a general decline of standards?

    1994:The centimeters on the ruler on p. 227 of the booklet are 0.97 cm long, because:

    The booklet were returned from the printer at 0.25 times the speed of lightA theorist is in charge of the PDGThe PDG feels it has the right to redefine anything it wantsThere is a general decline of standardsThere was an international conspiracyIt was a congressionally mandated cost-saving measurePDG gives you more cm/inch than anyone else

    Neutronenphysik

  • Vus Kaon semileptonic decaysK+p0l+nlK0Lp-l+nl sul+nlD = (2.120.08%), d = -2.0% for K+ and 0.5% for K0

    I+ = 0.1605 0.0009, I0 = 0.1561 0.0008G+ = (2.56 0.033)10-15 MeV, G0=(4.937 0.053)10-15 MeVf(0) = 0.961 0.008, f(0) = 0.963 0.004

    Vus = 0.2196 0.0017exp 0.0018th = 0.2196 0.0026 (PDG 2002)

    Neutronenphysik

  • Some news in 2005: Vusb

    Neutronenphysik

  • CKM unitarity summaryPhase of consolidationAchievements:New K resultsNew A resultHalving of the theoretical error in radiative correctionsContinue to measure lifetime and correlation coefficients until limited by theoryLifetimeFormfactors

    Neutronenphysik

  • NeutronlebensdauerMethode: UCN in FlaschenPrzision / ~ 10-3

    TUM~ 99.99 % elastische Reflexion~ 0.01% inelastische Reflexion in meV-Bereich ~ 0.001% Absorption885.7 0.7 sec 878.5 0.8 secTUM: magnetische Speicherung: keine Verluste

    Neutronenphysik

  • 2 values878.5 0.8 sec Serebrov et al.885.7 0.7 sec PDG 2005 = 2 x 10-6

    Neutronenphysik

  • Neutrons and Big Bang Nucleo SynthesisProblem 1s after Big Bang:What does a gas of n and p, when the universe expands and the temperature drops?Inputs:neutron lifetime Cross sectionsneutrino cross-sections 1/ nuclear physics 0.1 1 MeV (measured!)Outputs: H, D, He, Linumber of particle families N density of (ordinary) matter in universe

    Neutronenphysik

  • In more detailWeak reaction rate n + e+ p + e n + e p + eHubble expansion rateEquating gives freeze out temp.Free neutron beta-decayNeutron lifetimePDG 2006Serebrov et al.2005(1+ 3gA2)astro-ph/0408523 v2Yp= 0.2463(6)Yp= 0.2479(6)

    Neutronenphysik

    NeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysisNeutronsNeutron diffraction for crystal structure analysis