Particle theory

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Quark and Lepton Mass Matrices from Horizontal U(1) Symmetry

(1996)

Authors:

EJ Chun, A Lukas
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Large multiplicity fluctuations and saturation effects in onium collisions

(1996)

Authors:

AH Mueller, GP Salam
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Nucleosynthesis bounds on a time-varying cosmological 'constant'

ArXiv astro-ph/9605055 (1996)

Authors:

Michael Birkel, Subir Sarkar

Abstract:

We constrain proposed phenomenological models for a vacuum energy which decays with the expansion of the universe from considerations of standard big bang nucleosynthesis. Several such models which attempt to solve the cosmological age problem are disfavored or even ruled out.
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Nucleosynthesis bounds on a time-varying cosmological 'constant'

(1996)

Authors:

Michael Birkel, Subir Sarkar
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A supersymmetric resolution of the KARMEN anomaly

Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics 374:1-3 (1996) 87-92

Authors:

D Choudhury, S Sarkar

Abstract:

We consider the hypothesis that the recently reported anomaly in the time structure of signals in the KARMEN experiment is due to the production of a light photino (or Zino) which decays radiatively due to violation of R-parity. Such a particle is shown to be consistent with all experimental data and with cosmological nucleosynthesis. There are difficulties with constraints from SN 1987A but these may be evaded if squarks are non-degenerate in mass.
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