462 research outputs found
Update on the Measurement of alpha_S with a 500 GeV Linear Collider
An update on the prospects for the precise measurement of the strong coupling
constant alpha_S at a high energy Linear Collider via the three-jet rate is
presented. In particular, the issue of the distribution of center-of-mass
energies of the identified q-qbar event sample, which can affect the
determination of \alpha_S at the scale Q^2=(500 GeV)^2$, is addressed.Comment: 4 pages, 3 figures, LaTex, requires epsfig and aipproc macro
A Study of the Impact of High Cross Section ILC Processes on the SiD Detector Design
The SiD concept is one of two proposed detectors to be mounted at the
interaction region of the International Linear Collider (ILC). A substantial
ILC background arises from low transverse momentum
pairs created by the interaction of the
colliding beams' electromagnetic fields. In order to provide hermeticity and
sensitivity to beam targeting parameters, a forward Beamline Calorimeter
(BeamCal) is being designed that will provide coverage down to 5 mrad from the
outgoing beam trajectory, and intercept the majority of this pair background.
Using the SiD simulation framework, the effect of this pair background on the
SiD detector components, especially the vertex detector (VXD) and forward
electromagnetic calorimeter (FCAL), is explored. In the case of the FCAL,
backgrounds from Bhabha and two-photon processes are also considered. The
consequence of several variants of the BeamCal geometry and ILC interaction
region configuration are considered for both the vertex detector and BeamCal
performance
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