Generalized Weinberg Sum Rules in Deconstructed QCD

Recently, Son and Stephanov have considered an "open moose" as a possible dual model of a QCD-like theory of chiral symmetry breaking. In this note we demonstrate that although the Weinberg sum rules are satisfied in any such model, the relevant sums converge very slowly and in a manner unlike QCD. Further, we show that such a model satisfies a set of generalized sum rules. These sum rules can be understood by looking at the operator product expansion for the correlation function of chiral currents, and correspond to the absence of low-dimension gauge-invariant chiral symmetry breaking condensates. These results imply that, regardless of the couplings and F-constants chosen, the open moose is not the dual of any QCD-like theory of chiral symmetry breaking. We also show that the generalized sum rules can be "solved", leading to a compact expression for the difference of vector- and axial-current correlation functions. This expression allows for a simple formula for the S parameter (L_10), which implies that S is always positive and of order one in any (unitary) open linear moose model. Therefore the S parameter is positive and order one in any "Higgsless model" based on the continuum limit of a linear moose regardless of the warping or position-dependent gauge-coupling chosen.Comment: 12 pages, 5 eps figures; reference to overlapping work adde

Phonon Self-energy Effects Due To Superconductivity In Bi2sr2cacu2o8+δ

Raman scattering of A1g phonons in Bi2Sr2CaCu2O8+δ single crystals (δ=0.13, Tc=86 K) has been measured as a function of temperature. We report an anomalous softening in the frequency and a decrease in the linewidth of the A1g phonon at 290 cm-1 (O1,2 c-axis in-phase vibration) below Tc. We also confirm a smaller anomalous softening in the frequency of the A1g phonon at 465 cm-1 (O3 c-axis vibration), but for this phonon mode no linewidth anomaly has been found. We compare the anomalous softening and linewidth behavior in the superconducting state with theoretical calculations for isotropic s-wave, planar d-wave, and dx 2 -y 2 gap symmetries and as for a layered superconductor model.561384268431Thomsen, C., Cardona, M., Gegenheimer, B., Liu, R., Simon, A., (1988) Phys. Rev. B, 37, p. 9860Heynen, E.T., Cardona, M., Karpinski, J., Kaldis, E., Rusiecki, S., (1991) Phys. Rev. B, 43, p. 12958Kendizora, C., Kelley, R.J., Onellion, M., (1996) Phys. Rev. Lett., 77, p. 727Macfarlane, R.M., Rosen, H., Seki, H., (1987) Solid State Commun., 63, p. 831Ruf, T., Thomsen, C., Liu, R., Cardona, M., (1988) Phys. Rev. B, 38, p. 11985Burns, G., Chandrashekhar, G.V., Dacol, F.H., Strobel, P., (1989) Phys. Rev. B, 39, p. 775Bokholt, M., Erie, A., Splittgerber-Hünnekes, P.C., Güntherodt, G., (1990) Solid State Commun., 74, p. 1107Leach, D.H., Thomsen, C., Cardona, M., (1993) Solid State Commun., 88, p. 457Martin, A.A., Lee, M.J.G., (1995) Physica C, 254, p. 222Liu, R., Klein, M., Han, P.D., Payne, D.A., (1992) Phys. Rev. B, 45, p. 7392Menéndez, J., Cardona, M., (1984) Phys. Rev. B, 29, p. 2051Litvinchuk, A.P., Thomsen, C., Cardona, M., (1992) Solid State Commun., 83, p. 343Zeyher, R., Zwicknagl, G., (1990) Z. Phys. B, 78, p. 175Nicol, E.J., Jiang, C., Carbotte, J.P., (1993) Phys. Rev. B, 47, p. 8131Devereaux, T.P., (1994) Phys. Rev. B, 50, p. 10287Kendziora, C., Rosenberg, A., (1995) Phys. Rev. B, 52, pp. R986

A simple inert model solves the little hierarchy problem and provides a dark matter candidate

We discuss a minimal extension to the standard model in which two singlet scalar states that only interacts with the Higgs boson is added. Their masses and interaction strengths are fixed by the two requirements of canceling the one-loop quadratic corrections to the Higgs boson mass and providing a viable dark matter candidate. Direct detection of the lightest of these new states in nuclear scattering experiments is possible with a cross section within reach of future experiments.Comment: Finite corrections included. Model modified. Conclusion unchange

Equivalence Theorem and Probing the Electroweak Symmetry Breaking Sector

We examine the Lorentz non-invariance ambiguity in longitudinal weak-boson scatterings and the precise conditions for the validity of the Equivalence Theorem (ET). {\it Safe} Lorentz frames for applying the ET are defined, and the intrinsic connection between the longitudinal weak-boson scatterings and probing the symmetry breaking sector is analyzed. A universal precise formulation of the ET is presented for both the Standard Model and the Chiral Lagrangian formulated Electro-Weak Theories. It is shown that in electroweak theories with strongly interacting symmetry breaking sector, the longitudinal weak-boson scattering amplitude {\it under proper conditions} can be replaced by the corresponding Goldstone-boson scattering amplitude in which all the internal weak-boson lines and fermion loops are ignored.Comment: 20 pages, in LaTeX, to appear in Phys. Rev. D (1995). A few minor corrections were made to clarify our viewpoint of the Equivalence Theorem and compare our conclusion with those in the literatur

Searching for Higgs : From LEP towards LHC

After a brief introduction to the theoretical basis of the Higgs mechanism for generating the masses of elementary particles, the experimental searches for Higgs particles will be summarized, from bounds at LEP to inferences for LHC. The report will focus on the Standard Model, though some central results on extended Higgs systems, as conjectured for example in supersymmetric theories, will also be recapitulated. Alternative scenarios based on spontaneous symmetry breaking by novel strong interactions are adumbrated at the theoretical level.Comment: Added reference

Prospects for e+e- physics at Frascati between the phi and the psi

We present a detailed study, done in the framework of the INFN 2006 Roadmap, of the prospects for e+e- physics at the Frascati National Laboratories. The physics case for an e+e- collider running at high luminosity at the phi resonance energy and also reaching a maximum center of mass energy of 2.5 GeV is discussed, together with the specific aspects of a very high luminosity tau-charm factory. Subjects connected to Kaon decay physics are not discussed here, being part of another INFN Roadmap working group. The significance of the project and the impact on INFN are also discussed. All the documentation related to the activities of the working group can be found in http://www.roma1.infn.it/people/bini/roadmap.html.Comment: INFN Roadmap Report: 86 pages, 25 figures, 9 table

7th Drug hypersensitivity meeting: part two

No abstract availabl

Physics with the KLOE-2 experiment at the upgraded DAϕ\phiNE

Investigation at a $\phi$--factory can shed light on several debated issues in particle physics. We discuss: i) recent theoretical development and experimental progress in kaon physics relevant for the Standard Model tests in the flavor sector, ii) the sensitivity we can reach in probing CPT and Quantum Mechanics from time evolution of entangled kaon states, iii) the interest for improving on the present measurements of non-leptonic and radiative decays of kaons and eta/eta$^\prime$ mesons, iv) the contribution to understand the nature of light scalar mesons, and v) the opportunity to search for narrow di-lepton resonances suggested by recent models proposing a hidden dark-matter sector. We also report on the $e^+ e^-$ physics in the continuum with the measurements of (multi)hadronic cross sections and the study of gamma gamma processes.Comment: 60 pages, 41 figures; added affiliation for one of the authors; added reference to section