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Supersymmetry, Supergravity and R_b revisited in the light of LEP 2
J. Ellis, J. Lopez, D. Nanopoulos
A previous study of supersymmetric models has indicated that they are unlikely to make a large contribution to R_b. We revisit this analysis, taking into account the improved lower…
Single-photon signals at LEP in supersymmetric models with a light gravitino
J. Lopez, D. Nanopoulos, A. Zichichi
We study the single-photon signals expected at LEP in models with a very light gravitino. The dominant process is neutralino-gravitino production (e+e- -> chi+ G) with subsequent n…
Analysis of LEP Constraints on Supersymmetric Models with a Light Gravitino
J. Ellis, J. Lopez, D. Nanopoulos
We propose an analysis of LEP constraints on radiative neutralino decays into a light gravitino, based on the plane of the Higgs mixing parameter mu and the SU(2) gaugino mass M_2.…
No-scale supergravity confronts LEP diphoton events
J. Lopez, D. Nanopoulos, A. Zichichi
We examine the possibility that some anomalous acoplanar diphoton events observed at LEP may be consistent with the predictions of our previously proposed one-parameter no-scale su…
D-Brane Recoil Mislays Information
J. Ellis. N. Mavromatos, D. Nanopoulos
We discuss the scattering of a light closed-string state off a brane, taking into account quantum recoil effects on the latter, which are described by a pair of logarithmic ope…
Supersymmetric photonic signals at LEP
J. Lopez, D. Nanopoulos, A. Zichichi
We explore and contrast the single-photon and diphoton signals expected at LEP 2, that arise from neutralino-gravitino (e^+ e^- -> chi + gravitino -> gamma + E_miss) and neutralino…
Theoretical Summary
D. Nanopoulos
After a quick tour through the present status of the Standard Model, an attempt is made to set up a framework to discuss some presently available exotica, including and the C…
Experimental consequences of no-scale supergravity in light of the CDF event
J. Lopez, D. Nanopoulos
We explore two possible interpretations for the CDF event in the context of a recently proposed one-parameter no-scale supergravity model with a light g…
CPT and Superstring
John Ellis, N. E. Mavromatos, D. V. Nanopoulos
We discuss the possibility that CPT violation may appear as a consequence of microscopic decoherence due to quantum-gravity effects, that we describe using a density-matrix formali…
D Branes from Liouville Strings
J. Ellis, N. E. Mavromatos, D. V. Nanopoulos
We develop quantization aspects of our Liouville approach to non-critical strings, proposing a path-integral formulation of a second quantization of string theory, that incorporate…
Enhanced Supersymmetric Corrections to Top-Quark Production at the Tevatron
J. Kim, J. Lopez, D. Nanopoulos +1
We calculate the one-loop supersymmetric electroweak-like and QCD-like corrections to the top-quark pair-production cross section at the Tevatron, including the important effects o…
Distance Measurement and Wave Dispersion in a Liouville-String Approach to Quantum Gravity
G. Amelino-Camelia, J. Ellis, N. E. Mavromatos +1
Within a Liouville approach to non-critical string theory, we discuss space-time foam effects on the propagation of low-energy particles. We find an induced frequency-dependent dis…
Leptophobic in stringy flipped SU(5)
J. Lopez, D. Nanopoulos
We show that leptophobic gauge bosons occur naturally in flipped SU(5) and may shift in an interesting way without upsetting the good values of and . With…
Quantum Decoherence in a Four-Dimensional Black Hole Background
John Ellis, N. E. Mavromatos, D. V. Nanopoulos +1
We display a logarithmic divergence in the density matrix of a scalar field in the presence of an Einstein-Yang-Mills black hole in four dimensions. This divergence is related to a…
A Non-critical String (Liouville) Approach to Brain Microtubules: State Vector reduction, Memory coding and Capacity
N. E. Mavromatos, D. V. Nanopoulos
Microtubule (MT) networks, subneural paracrystalline cytosceletal structures, seem to play a fundamental role in the neurons. We cast here the complicated MT dynamics in the form o…
Experimental constraints on a stringy SU(5)U(1) model
J. Lopez, D. Nanopoulos, A. Zichichi
We re-examine the phenomenological aspects of a recently proposed string-derived SU(5)U(1) one-parameter supergravity model, and explore the sensitivity of the model predic…