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30 papers · 2 filters
Astrophysical Bounds on Milli-Charged Particles in Models with a Paraphoton
Sacha Davidson, Michael Peskin
The upper bound on the number of relativistic species present at nucleosynthesis has been used to constrain particles with electric charge (). We correct the bo…
Squark Mass Determination at the Next Generation of Linear Colliders
Jonathan Feng, Donald Finnell
Current mass limits allow the possibility that squarks may be produced in large numbers at the next generation of linear colliders. In this paper we investigate the prospe…
The Decay in Heavy Quark Effective Theory
Gustavo Burdman, Zoltan Ligeti, Matthias Neubert +1
We present a systematic analysis of the weak decay form factors to order in the heavy quark effective theory, including a discussion of renormalizati…
Zeroing in on more photons and gluons
R. W. Brown, M. E. Convery, M. A. Samuel
We discuss radiation zeros that are found in gauge tree amplitudes for processes involving multi-photon emission. Previous results are clarified by examples and by further elaborat…
Short-Distance Expansion of Heavy-Light Currents at Order 1/m
Matthias Neubert
The short-distance expansion of the heavy-light currents and is constructed to order , and to next-to-leading order in renormalization-gro…
A Systematic SO(10) Operator Analysis for Fermion Masses
G. Anderson, S. Raby, S. Dimopoulos +2
A new approach for deducing the theory of fermion masses at the scale of grand unification is proposed. Combining SO(10) grand unification, family symmetries and supersymmetry with…