We have searched for prompt heavy quarkonia and Bc mesons in 3 × 106 hadronic Z0 decays recorded with the DELPHI detector at LEP. No signal was observed in any of these modes. We achieved the highest sensitivities for gluon fragmentation into J/ψ and for semileptonic B c decays, yielding branching ratio upper limits of B(Z 0 → J/ψggX) < 4.1×10−4 and B(Z0 → B c X)·B(B ± c → J/ψl νl) < 5.0×10 −5 ...

We study the following online problem: at each time unit, one of m identical items is offered for sale. Bidders arrive and depart dynamically, and each bidder is interested in winning one item between his arrival and departure. Our goal is to design truthful mechanisms that maximize the welfare, the sum of the utilities of winning bidders. We first consider this problem under the assumption tha...

Acute heat shock initiates the phenomenon of “prompt” glycosylation, which is characterized by selective glycosylation of specific cellular proteins called the prompt stress glycoproteins (P-SG). Prompt glycosylation rapidly occurs even during short heating periods, e.g. 10 min at 45 “C, and is not affected by the presence of cycloheximide (Henle, K. J., Kaushal, G. P., Nagle, W. A, and Nolen, ...

We describe a system, Prompt, used to design physical systems. Prompt employs a multi-level approach to design. When simple constraint propagation over prototypes [Adda fails, Prompt can significantly modify prototypes by reasoning about their structure and physics. Prompt derives the behavior of a prototype from its structure using knowledge of physics stored in a Graph of Models. It then uses...

In ee and in hadron-hadron reactions at collider energies, prompt photons are observed and their cross sections are measured only if the photons are relatively isolated in phase space. Isolation is required to reduce various hadronic backgrounds including those from the electromagnetic decay of mesons, e.g., π → 2γ. The essence of isolation is that a cone of half-angle δ is drawn about the dire...