Results 1 - 10 of 30089
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[en] The Dualized Standard Model which has a number of very interesting physical consequences is itself based on the concept of a nonabelian generalization to electric-magnetic duality. This paper explains first the reasons why the ordinary (Hodge) does not give duality for the nonabelian theory and then reviews the steps by which these difficulties are surmounted, leading to a generalized duality transform formulated in loop space. The significance of this in relation to the Dualized Standard Model is explained, and possibly also to some other areas. (author)
[en] Theoretical expectations for direct and indirect searches for relic neutralinos are presented. Evaluations of event rates are discussed in different theoretical scenarios and compared with experimental capabilities of detectors for direct detection and neutrino telescopes. (author)
[en] We search for CP violation in a sample of 20,000 Cabibbo-suppressed decays, D+ → K+KS0π+π-, and 30,000 Cabibbo-favored decays, Ds+ → K+KS0π+π-. We use 520 fb-1 of data recorded by the BABAR detector at the PEP-II asymmetric-energy e+e- collider operating at center of mass energies near 10.6 GeV. We search for CP violation in the difference between the T-odd asymmetries obtained using triple product correlations of the D+ (Ds+) and D- (Ds-) decays, respectively. The T violation parameter values obtained are ΑT (D+) = (-12.0 ± 10.0stat ± 4.6syst) x 10-3 and ΑT(Ds+) = (-13.6 ± 7.7stat ± 3.4syst) x 10-3, which are consistent with the Standard Model expectations.
[en] Charged lepton flavor violating processes are unobservable in the standard model, but they are predicted to be enhanced in several extensions to the standard model, including supersymmetry and models with leptoquarks or compositeness. We present a search for such processes in a sample of 99 x 106 Υ(2S) decays and 117 x 106 Υ(3S) decays collected with the BABAR detector. We place upper limits on the branching fractions Β(Υ(nS) → e±τ±) and Β(Υ(nS) → μ±τ±) (n = 2, 3) at the 10-6 level and use these results to place lower limits of order 1 TeV on the mass scale of charged lepton flavor violating effective operators.
[en] We report on recent measurements of branching fractions and CP violation observables of selected charmless hadronic B decays obtained from data collected with the BABAR detector at the PEP-II asymmetric-energy collider, operating at the Υ(4S) resonance.
[en] The robust character of the Standard Model is confirmed. Examination of its geometrical basis in three equivalent internal symmetry spaces - the unitary plane C2, the quaternion space Q, and the real space R4 - as well as the real space R3 uncovers mathematical properties that predict the physical properties of leptons and quarks. The finite rotational subgroups of the gauge group SU(2)L x U(1)Y generate exactly three lepton families and four quark families and reveal how quarks and leptons are related. Among the physical properties explained are the mass ratios of the six leptons and eight quarks, the origin of the left-handed preference by the weak interaction, the geometrical source of color symmetry, and the zero neutrino masses. The (u,d) and (c,s) quark families team together to satisfy the triangle anomaly cancellation with the electron family, while the other families pair one-to-one for cancellation. The spontaneously broken symmetry is discrete and needs no Higgs mechanism. Predictions include all massless neutrinos, the top quark at 160 GeV/c2, the b' quark at 80 GeV/c2, and the t' quark at 2600 GeV/c2