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32 papers · 1 filter
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…
Search for Diphoton Events with Large Missing Transverse Energy in proton-antiproton collisions at sqrt(s) = 1.8 TeV
S. Abachi
A search for signals of new physics has been carried out in the channel p pbar -> gamma gamma + ETmiss. This signature is expected in various recently proposed supersymmetric (SUSY…
Search for Top Squark Pair Production in the Dielectron Channel
D0 Collaboration, S. Abachi
This report describes the first search for top squark pair production in the channel stop_1 stopbar_1 -> b bbar chargino_1 chargino_1 -> ee+jets+MEt using 74.9 +- 8.9 pb^-1 of data…
Evolution of the Low-Energy Photon Spectra in Gamma-Ray Bursts
A. Crider, E. P. Liang, I. A. Smith +6
We report evidence that the asymptotic low-energy power law slope alpha (below the spectral break) of BATSE gamma-ray burst photon spectra evolves with time rather than remaining c…
Limits on Anomalous Couplings from Events at TeV
The DZero Collaboration, S. Abachi
We have measured the gauge boson coupling parameters using () events at TeV. The data, corresponding to an integrated luminosi…
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…
High Carbon in I Zwicky 18: New Results from Hubble Space Telescope Spectroscopy
D. R. Garnett, E. D. Skillman, R. J. Dufour +1
We present new measurements of the gas-phase C/O abundance ratio in both the NW and SE components of the extremely metal-poor dwarf irregular galaxy I Zw 18, based on ultraviolet s…
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.…
Non-Fermi Liquids in the Extended Hubbard Model
Qimiao Si
I summarize recent work on non-Fermi liquids within certain generalized Anderson impurity model as well as in the large dimensionality () limit of the two-band extended Hubbard…
Stiefel-Whitney Currents
Reese Harvey, John Zweck
A canonically defined mod 2 linear dependency current is associated to each collection of m sections of a real rank n vector bundle. This current is supported on the linear depende…
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…
Radiative Muon Capture on Hydrogen and the Induced Pseudoscalar Coupling
G. Jonkmans, S. Ahmad, D. S. Armstrong +24
The first measurement of the elementary process is reported. A photon pair spectrometer was used to measure the partial branching ratio ($2.10 \pm 0.22)…
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…
Measurement of the Boson Mass
Marcel Demarteau
A measurement of the mass of the boson is presented based on a sample of 5982 decays observed in collisions at = 1.8~TeV with the…
Physical Conditions in Low Ionization Regions of the Orion Nebula
J. A. Baldwin, A. Crotts, R. J. Dufour +12
We reexamine the spectroscopic underpinnings of recent suggestions that [O I] and [Fe II] lines from the Orion H II region are produced in gas where the iron-carrying grains have b…
Making proofs without Modus Ponens: An introduction to the combinatorics and complexity of cut elimination
Alessandra Carbone, S. Semmes
This paper is intended to provide an introduction to cut elimination which is accessible to a broad mathematical audience. Gentzen's cut elimination theorem is not as well known as…
Looking from the inside and from the outside
Alessandra Carbone, S. Semmes
One often sees a sharp distinction in mathematics between descriptions from the outside and from the inside. Think of defining a set in the plane through an algebraic equation, or…
String Unification and Leptophobic in Flipped SU(5)
J. Lopez
We summarize recent developments in the prediction for , self-consistent string unification and the dynamical determination of mass scales, and leptophobic gauge bos…
A supergravity explanation of the CDF event
J. Lopez, D. Nanopoulos
We present a unified no-scale supergravity model with a light gravitino that can naturally explain the observed event at CDF via right-handed selectron pair-production. The…
Search for Anomalous WW and WZ Production in ppbar Collisions at sqrt(s) = 1.8 TeV
The DZero Collaboration, S. Abachi
We present results from a search for anomalous WW and WZ production in ppbar collisions at sqrt(s) = 1.8 TeV. We used ppbar->evjjX events observed during the 1992-1993 run of the F…
Kosterlitz-Thouless Transition and Short Range Spatial Correlations in an Extended Hubbard Model
Qimiao Si, J. Lleweilun Smith
We study the competition between intersite and local correlations in a spinless two-band extended Hubbard model by taking an alternative limit of infinite dimensions. We find that…
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…
Response to Tarrach's "Mode Dependent Field Renormalization and Trivialty"
M. Consoli, P. M. Stevenson
We respond to Tarrach's criticisms (hep-th/9511034) of our work on lambda Phi^4 theory. Tarrach does not discuss the same renormalization procedure that we do. He also relies on re…
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…