60563789
The effect of the CERNET network on computing at CERN
108673538
THE CERN TRACK-MATCH PROGRAM FOR VERTEX GUIDANCE BUBBLE CHAMBER MEASUREMENT SYSTEMS.
122062189
Two years of real progress in European HEP networking : a CERN perspective
Abstract The last two years have been marked by real progress in networking in HEP. Home-made developments, studies and plans have given way to the use of real networks involving hundreds of HEP and other computers and based on externally produced software and hardware. Within the last year, the first generation of industrial software products following some of the international standards for networking have become available. Related developments are taking place in networking for on-line systems and indeed the LEP experiments are distinguished by their heavy and crucial reliance on both local and wide-area networks. This paper describes the progress made at CERN since the last two years and looks at perspectives for the future.
107816989
Performance of the HPD minimum guidance systeme, pt 1
195705202
Local area networks for microcomputers
Abstract This paper analyses the ways in which modern high performance Local Area Networks (LANs) can be of use to microcomputers. It discusses some of the basic concepts of LANs, with special reference to international standards. It then presents ways in which LANs may be connected to, and used with microcomputers. Examples are given of existing applications.
119231612
Ultimate survival in anomalous psi(2S) decays
The hierarchy among the radiative γ(π0, η, η′) decay channels for the ψ′ looks quite different from the J/ψ one. The fate of charm, namely an ultimate survival of on-shell cc¯ intermediate states, might give us the clue for this new puzzle in exclusive charmonium decays. A similar self-preservation has already been invoked in the past to solve the so-called ρπ puzzle.
31098631
Primordial constraint on the spatial dependence of the Newton constant
A Nordtvedt effect at cosmological scales affects the acoustic oscillations imprinted in the cosmic microwave background. The gravitational baryonic mass density of the universe is inferred at the first peak scale from WMAP data. The independent determination of the inertial baryonic mass density through the measurement of the deuterium abundance in the framework of standard big bang nucleosynthesis leads to a new constraint on a possible violation of the strong equivalence principle at the recombination time. Comment: 4 pages, REVTeX4. Changes include (a) corrections of typos and (b) addition of references
125311467
D0 $\to \bar{K}0 \phi$: Annihilation Form-factor and 1/$N$ Expansion
The weak form factor associated with the pure annihilation decay D0 →K0ϕ is evaluated assuming factorization of the hadronic matrix element and using single-pole approximation and experimental data for ϕ→KK. Chiral SU(3)×SU(3) current algebra and PCAC extrapolated to large q2 = mD2 imply a very small branching ratio B(D0 → K0ϕ) = O(10−3%), far below the experimental value O(1%). The recently suggested large-N approximation enhances this estimate considerably, but in order to fully reproduce the data either non-leading in 1N terms have to be included (breakdown of factorization) or PCAC has to be strongly violated at such large value of q2. Indeed moderate violations of PCAC give B(D0 → K0ϕ) = O(10−3%) in the large-N limit. In the presence of strong violations of PCAC at q2 = mF2 the branching ratio for F+ → ϱπ+, another pure annihilation channel, could be as large as 10%.
120899275
A model for leptons and quarks
Abstract A composite model for leptons and quarks is constructed starting from two fundamental fermions and a scalar. The model satisfies a modified form of 't Hooft's anomaly equations and predicts three active generations of leptons and four generations of quarks.
1197376
Cosmic microwave background constraints on the strong equivalence principle
We study the effect of a violation of the strong equivalence principle (SEP) on the cosmic microwave background (CMB). Such a violation would modify the weight of baryons in the primordial gravitational potentials and hence their impact in the establishment of the photon-baryon plasma acoustic oscillations before recombination. This cosmological Nordtvedt effect alters the odd peaks height of the CMB temperature anisotropy power spectrum. A gravitational baryonic mass density of the universe may already be inferred at the first peak scale from the analysis of WMAP data. Experimental constraints on a primordial SEP violation are derived from a comparison with the universe's inertial baryonic mass density measured either in a full analysis of the CMB, or in the framework of the standard big bang nucleosynthesis (BBN). Comment: Version accepted for publication in Phys. Rev. D, 8 pages, Revtex 4; discussion of "Experimental constraints" extended, references added, typos corrected