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Flavour in the era of the LHC, 4th meeting
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Europe/Zurich
CERN
CERN
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Before 1950 all theorists believed P (parity symmetry) and that there consequently could be no EDM for any elementary particle. Ramsey and Purcell [PR 78, 807 (1950)] pointed out that there was no experimental evidence for P in the case of nuclear forces so it should be tested. They proposed a search for a neutron EDM or dn, as a test of P. The 1953 neutron beam experiment at Oak Ridge showed dn<5x10^{-20} e- cm. In 1956 Lee and Yang suggest P failure in weak force, which was confirmed next year by Wu and Ambler. Many theorists argued that, despite this P failure, there should still be no EDM because of T (time reversal symmetry). In 1957 Ramsey and J.D. Jackson pointed out that there was no experimental evidence for T in nuclear forces so neutron EDM tests were continued. In 1964 Oak Ridge Beam experiment dn<10^{-21} e-cm. In 1964 Fitch et al discovered failure of CP in K0L so T would fail if CPT conserved. Theorists reverse their view and became very interested in our experiments and are puzzled by our very low EDM limits. Other labs begin EDM experiments on neutron and atoms. In 1967 Oak Ridge Beam Experiments dn<4x10^{-23} e-cm, and in 1973 Grenoble Beam dn<4x10^{-24} e-cm. In 1984 experiments with ultra cold neutrons stored in bottles by independent Russian group in St. Petersburg and by group in Grenoble dn<3x10^{-25} e-cm. In 1999 St. Petersburg group and Grenoble group independently dn<6.3x10^{-26} e- cm. In 2006 Grenoble group with geometric phase correction find dn<3.0x10^{-26} e-cm. Experimental results compared with theoretical predictions.Speaker: Norman Ramsey (Harvard)
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A review of the effective theory treatment of CP-odd operators contributing to EDMs, and the ensuing sensitivity to new CP-violating physics. As examples, new dimension-five operators in the MSSM, and a new Higgs-sector threshold allowing for electroweak baryogenesis, will be discussed.Speaker: Adam Ritz (Victoria/Canada)
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Coffee break 15m
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This talk will review three neutron EDM experiments: First, the room-temperature experiment at ILL, the results of which have just been published; second, the CryoEDM experiment at ILL that is now nearing the completion of its construction, and which promises an improvement in sensitivity of two orders of magnitude; and third, for the longer term, the cryogenic experiment that is planned to be built at the SNS in Oak Ridge, which is anticipated to have a sensitivity of below 1E-28 e.cm.Speaker: P. Harris (Sussex)
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Status and plans for the neutron EDM experiment at PSI are updated. The idea for a compact muon EDM experiment with a sensitivity of 5x10^(-23) e-cm will be briefly discussed.Speaker: K. Kirch (PSI)
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Speaker: Roman Zwicky (Durham IPPP)
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Using the e^+- mu^-+ + E_Tmiss signature in the search for supersymmetry and lepton flavour violation in neutralino decays¶ 15mSpeaker: Nikolai Krasnikov
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lunch break 1h
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Dilating the muon lifetime to 300 microsec can lead to ten times better accuracy. This can be achieved with a new design of storage ring using discrete magnets and calibrating the field by means of polarised protons in flight.Speaker: F. Farley (Yale)
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A theoretical motivation for an EDM search on the deuteron will be presented, together with the so-called resonance method. The basic features of this method will be discussed in some detail.Speaker: G. Onderwater (KVI)
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Coffee break 15m
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A plan of comprehensive investigation of systematic errors and spin coherence time for the deuteron resonance EDM experiment¶ 45mSpeaker: Y. Orlov (Cornell)
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Nuclei which are characterized by octupole deformation should have relatively large Schiff moments and therefore be particularly sensitive to T-violating interactions in the nucleus. Currently, the most stringent limits in this sector are set by measurements made at the University of Washington, which restrict the atomic EDM of Hg-199 to <2.1x10^{-28} e cm. We are developing an experiment around Ra-225, which is predicted to be two to three orders of magnitude more sensitive to T-violating interactions in the nucleus than Hg-199. The experimental scheme and our recent success in laser-trapping radium will be discussed along with other group's efforts to take advantage of this enhancement.Speaker: J.R. Guest (Argonne)
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Speaker: Sebastien Descotes-Genon (LPT Orsay)
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Speaker: Claudio Verzegnassi
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Speaker: Pedro Miguel Martins Ferreira
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The experiment responsible for the current limit on the electron's electric dipole moment is described. A very brief overview of the many current efforts to push this limit is presented. Efforts underway at the University of Oklahoma to exploit the unique magnetic properties of PbF are described with a particular emphasis on the development of new resonant enhanced multiphoton ionization schemes.Speaker: N. Shafer-Ray (Oklahoma Univ.)
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Speaker: M. Kozlov (St. Petersburg)
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Coffee break 15m
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A proposal has been approved at the BNL AGS to improve upon the muon magnetic anomaly measurement uncertainty by a factor of two, to 0.25 ppm. The current experimental value differs from the theoretical value by about 3 standard deviations. This suggests the possibility of new physics, and an increased data set could make the comparison between theory and experiment more definitive.Speaker: J. Miller (Boston)
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The contribution from hadronic vacuum polarization to the muon anomalous magnetic moment is calculated with a dispersion relation using experimental data and perturbative QCD as input. Its uncertainty is presently limiting the Standard Model prediction, and is of the same order as the experimental error on g-2. The state of the art of the calculation is discussed and perpectives for future improvement are given.Speaker: Andreas Hoecker (CERN)
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The Budker Institute (Novosibirsk, Russia) is mostly dedicated to physics in
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At the Frascati phi-factory DAFNE the pion form factor is measured by means of the "radiative return", i.e. by using events in which one of the collider electrons (positrons) has radiated an initial state radiation photon (ISR), lowering in such a way the invariant mass M(pi pi) of the two-pion-system. In a recent publication of the KLOE collaboration the initial state radiation photon had been required to be at small polar angles with respect to the beam axis, the so called "Small Angle analysis", using data collected in 2001. We show an update of this analysis, using 2002 data. We also present results from a new and complementary analysis in which the photon is tagged at large polar angles. Only like this the threshold region M^2(pi pi)< 0.35 GeV^2 becomes accessible.Speaker: Debora Leone (Karlsruhe)
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Speaker: Juan Antonio Aguilar-Saavedra
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Speaker: Lotte Wilke (Uni Zuerich)
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Speaker: Andrey Starodumov (ETH Zuerich)
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Speaker: Stephane Lavignac (SPhT Saclay)
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Speaker: Werner Rodejohann (TU Muenchen)
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We compare the patterns of the flavor violating effects which are radiatively induced via the neutrino Yukawa couplings in "minimal" SU(5) models with the Type I or Type II seesaw mechanism for the neutrino masses. We pay special attention to the ratio between the lepton flavor violations and the quark flavor violations, and especially to its dependence on the UV physics, such as the GUT parameters and cutoff scale.Speaker: Toshifumi Yamashita (S.I.S.S.A.)
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We determine the leptonic mixing matrix elements without assuming unitarity. To do this, we firstly develop the formalism to study neutrino oscillations and then we perform the fits. We realize that oscillation experiments alone are not enough to constrain all the matrix elements. However, by combining them with other electroweak data, we can determine all of them.Speaker: Carla Biggio (Madrid)
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Speaker: Gerald Gabrielse (Harvard)
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Certain relations among EDMs can be viewed as indirect evidence for supersymmetry. I will report on recent work on EDM correlations which includes analyses of non-universal SUSY models.Speaker: Oleg Lebedev (Bonn)
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It is proposed to measure the rate of coherent muon to electron conversion in the field of a nucleus, without neutrino production, to a precision of 10^{-16} times the rate of ordinary muon capture on the nucleus. This is an example of charged lepton flavor violation. The measurement would be several thousand times more sensitive than previous experiments. A working group has been formed to examine the feasibility of performing the experiment at Fermilab. The group met in mid-September, 2006, at Fermilab. I will describe briefly the status and prospects of this project and what transpired at the meeting.Speaker: Jim Miller (Boston)
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We discuss the LHCb potential for the LFV B->e mu decay and the possibility of constraining the leptoquark mass within the context of the Pati-Salam SU(4) model.Speaker: Walter Bonivento (I.N.F.N. Cagliari, Italy)
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We discuss the dependence of the rates of LFV processes mu -> e + gamma, tau -> e + gamma, tau -> mu + gamma (l_i -> l_j + gamma) and their ratios in MSSM with right-handed neutrinos on CP phases. We focus on the case of quasi-degenerate in mass heavy Majorana neutrinos. The three types of light neutrino mass spectrum - normal hierarchical, inverted hierarchical and quasi-degenerate - are considered.Speaker: Dr Tetsuo Shindou (SISSA)
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We analyze the possibility of generating masses and mixing angles to neutrinos via bilinear R-Parity and lepton number violation alone (not trilinear).Speaker: Dr Marco Aurelio Diaz (Universidad Catolica de Chile)
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The B -> Xs gamma branching ratio estimate at the next-to-next-to-leading order in QCD is discussed. Constrains on certain beyond-SM effects are updated.Speaker: Mikolaj Misiak (Warsaw)
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One of the attractive features of fundamental research is the frequency with which new methods or discoveries in one narrow field of research eventually often make very important contributions to other fields. This has been conspicuously true of magnetic resonance, with which I have been associated ever since I.I. Rabi invented and demonstrated the method for the important but limited purpose of measuring nuclear magnetic moments. The following year we were surprised by the unexpected appearance of the H2 magnetic resonance, which we soon showed was due to the magnetic effects of the other proton and the rotating charged molecule; from these measurements we could also obtain important chemical and molecular information. We had another shock when we studied D2 and found the resonance curves were spread more widely for D2 than H2 even though the magnetic interactions should have been much smaller. We found we could explain this by assuming that the deuteron had an electric quadrupole moment and J. Schwinger pointed out that this would require the existence of a previously unsuspected electric tensor force between the neutron and the proton. With this, the resonance method was also giving new fundamental information about nuclear forces. In 1944, Rabi and I pointed out that it should be possible by the Dirac theory and our past resonance experiments to calculate exactly the hyperfine interaction between the electron and the proton in the hydrogen atom and we had two graduate students, Nafe and Nelson do the experiment and they found a disagreement which led J. Schwinger to develop the first successful relativistic quantum field theory and QED. In 1964, Purcell, Bloch and others detected magnetic resonance transitions by the effect of the transition on the oscillator, called NMR, making possible measurements on liquids, solids and gases and giving information on chemical shifts and thermal relaxation times T1 and T2. I developed a magnetic resonance method for setting a limit to the EDM of a neutron in a beam and with others for neutrons stored in a suitably coated bottle. Magnetic resonance measurements provide high stability atomic clocks. Both the second and the meter are now defined in terms of atomic clocks. Lauterbuhr, Mansfield and Damadian and others developed the important methods of using inhomogeneous magnetic fields to localize the magnetic resonance in a tissue sample producing beautiful and valuable magnetic resonance images, MRI’s, and fMRI’s.Speaker: Norman Ramsey (Harvard University)
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