To achieve maximam integrated luminosity at the SLAC Linear Collider, a method of noninvasive beam tuning is required . Traditional luminosity monitors based on Bhabha scattering are inadequate because of low instantaneous counting rates. Coherent deflections of one beam by the electromagnetic field of the other are sensitive not only to the relative steering of the two bunches but also to thei...

It has been recently suggested by Arkani-Hamed, Dimopoulos and Dvali that gravity may become strong at energies not far above the electroweak scale and thus remove the hierarchy problem. Such a scenario can be tested at both present and future accelerators since towers of Kaluza-Klein gravitons and associated scalar fields now play an important phenomenological role. In this paper we examine se...

A fast and simple Monte Carlo program is presented that simulates single Bremsstrahlung in Bhabha scattering, ee → eeγ, without constraints on scattering angles. This allows the study of this process at arbitrarily small, or even vanishing, scattering angles. Experimental cuts can be imposed on an event-by-event basis, allowing for detailed studies of the process as a limitation to beam lifetim...

Spectrum of elementary string states in type II string theory contains ultra-short multiplets that are marginally stable. U -duality transformation converts these states into bound states at threshold of p-branes carrying Ramond-Ramond charges, and wrapped around p-cycles of a torus. We propose a test for the existence of these marginally stable bound states. Using the recent results of Polchin...

Bhabha Atomic Research Centre, Mumbai, India designed and developed a telecobalt unit, which was named as Bhabhatron-II. In this paper, the results pertaining to radiation safety of indigenously developed Bhabhatron-II telecobalt unit are reported. The various tests were carried out as per requirements of International Electrotechnical Commission standard and acceptance criteria developed natio...