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19922026
Showing 1997 · hep-phShow all

20 papers · 2 filters

hep-ph1997★ 1 cited

Exclusive photoproduction of on Proton in the quark-diquark model

C. Carimalo, N. Arteaga-Romero, S. Ong

We present predictions for the exclusive photoproduction of -meson on Proton at large tranfer, where we use a quark-diquark structure model for the proton. Extrapolation from ou…

hep-ph1997

The gaussian propagator formalism and the determination of the leading Regge trajectory for phi^3 field theory

Richard Hong Tuan

As the number of loops goes to infinity Feynman -parameters undergo a fixing mechanism which entails a gaussian representation for propagators in scalar field theories. Here, we…

hep-ph1997★ 3 cited

Multibody neutrino exchange in a neutron star: neutrino sea and border effects

As. Abada, O. Pène, J. Rodriguez-Quintero

The interaction due to the exchange of massless neutrinos between neutrons is a long-range force. Border effects on this multibody exchange inside a dense core are studied and comp…

hep-ph1997★ 8 cited

Alternative Theories of CP violation

Riccardo Barbieri, Lawrence Hall, Achille Stocchi +1

Recent improvements to the limit of Delta M_{B_s} imply that pure superweak theories, while not excluded, no longer provide a good fit to the data. A class of general superweak the…

hep-ph1997★ 17 cited

Neutralino Cascades in the (M+1)SSM

U. Ellwanger, C. Hugonie

In the (M+1)SSM an additional gauge singlet Weyl spinor appears in the neutralino sector. For a large part of the parameter space this approximative eigenstate is the true LSP. The…

hep-ph1997★ 132 cited

Improved Determination of alpha_QED(M_Z^2) and the Anomalous Magnetic Moment of the Muon

M. Davier, A. Hoecker

We reevaluate the hadronic contribution to the running of the QED fine structure constant alpha(s) at s = M_Z^2. We use data from e+e- annihilation and tau decays at low energy and…

hep-ph1997★ 38 cited

Measurements of the and parameters of the matrix and perspectives

P. Paganini, F. Parodi, P. Roudeau +1

A review of the current status of the Cabibbo-Kobayashi-Maskawa matrix () is presented and a special emphasis is put on the determination of the and parameters. Fr…

hep-ph1997★ 117 cited

Infrared Safe but Infinite: Soft-Gluon Divergences Inside the Physical Region

S. Catani, B. R. Webber

We show that QCD observables defined as infrared- and collinear-safe, according to the usual Sterman-Weinberg criteria, can nevertheless be infinite at accessible points inside pha…

hep-ph1997

Supersymmetric particle searches at LEP

J. -F. Grivaz

Searches for supersymmetric particles performed at LEP 1 and LEP 2 are reviewed. Using the MSSM with R-parity conservation as a reference model, the various analyses are briefly de…

hep-ph1997★ 19 cited

Implications of the Fleischer-Mannel Bound

Yuval Grossman, Yosef Nir, Stephane Plaszczynski +1

Fleischer and Mannel (FM) have shown that it may become possible to constrain the angle of the unitarity triangle from measurements of various decays. This constraint…

hep-ph1997★ 54 cited

Power Corrections and Nonlocal Operators

Gregory P. Korchemsky, Gianluca Oderda, George Sterman

We discuss power corrections to infrared safe cross sections and event shapes, and identify a nonperturbative function that governs 1/Q corrections to these quantities.

hep-ph1997★ 2 cited

Supersymmetric loop effects

P. H. Chankowski, S. Pokorski

We review the loop effects of the low energy supersymmetry. The global success of the Standard Model rises two related questions: how strongly the mass scales of the superpartners…

hep-ph1997★ 20 cited

Probabilistic versus Field-Theoretical Description of Heavy Flavour Production off Nuclei

N. Armesto, M. A. Braun, A. Capella +2

The absorptive corrections resulting from the rescattering of a heavy flavour (the so-called nuclear absorption) are usually calculated with a probabilistic formula valid only in t…

hep-ph1997★ 49 cited

Relativistic effects in the pionium lifetime

H. Jallouli, H. Sazdjian

The pionium decay width is evaluated in the framework of chiral perturbation theory and the relativistic bound state formalism of constraint theory. Corrections of order O(α) are c…

hep-ph1997★ 84 cited

Lambda^2-contribution to the condensate in lattice gauge theory

G. Burgio, F. Di Renzo, G. Marchesini +1

We present some evidence that in Lattice Gauge Theory the condensate contains a non-perturbative contribution proportional to , the square of the physical scale. This result i…

hep-ph1997★ 65 cited

A quantitative reanalysis of charmonium suppression in nuclear collisions

N. Armesto, A. Capella

We present a quantitative description of and suppression in proton-nucleus and nucleus-nucleus collisions at CERN energies. We use a conventional hadronic framewor…

hep-ph1997★ 620 cited

Radiative energy loss of high energy quarks in finite-size nuclear matter and quark-gluon plasma

B. G. Zakharov

The induced gluon radiation of a high energy quark in a finite-size QCD medium is studied. For a sufficiently energetic quark produced inside a medium we find the radiative energy…

hep-ph1997★ 45 cited

Improved Determination of the Hadronic Contribution to the Muon (g-2) and to alpha(M_Z**2) Using new Data from Hadronic Tau Decays

R. Alemany, M. Davier, A. Hocker

We have reevaluated the hadronic contribution to the anomalous magnetic moment of the muon (g-2) and to the running of the QED fine structure constant alpha(s) at s=M_Z**2. We inco…

hep-ph1997

The Running Gauge Coupling in the Exact Renormalization Group Approach

Ulrich Ellwanger

We discuss the perturbative running Yang-Mills coupling constant in the Wilsonian exact renormalization group approach, and compare it to the running coupling in the more conventio…

hep-ph1997★ 160 cited

A sum rule approach to the violation of Dashen's theorem

B. Moussallam

A classic sum rule by Das et al. is extended to seven of the low-energy constants , introduced by Urech, which parameterize electromagnetic corrections at chiral order $O(e^2p…