No. 54 (00166)

Family name : Watanabe
Given name : Takashi
Affiliation : Kougakuin Univ.
Abbreviation : 
E-mail address : Takashi.Watanabe@map.kogakuin.ac.jp
Title : Luminosity spectrum measurement in future e+ e- linear colliders
Authors : J. Fujimoto, S. Kawabata, Y. Kurihara, A. Shibata, T. Watanabe
Abstract : 
In future e+e- linear colliders, the collider energy cannot be
monochromatic due to the large effects of beam-beam interaction before
e+e- collisions.  The luminosity must have a continue spectrum which
distributes around the nominal energy and has a long tail toward the
low-energy region.  An a accurate measurement of the luminosity spectrum
is indispensable for a precise experiments at e+ e- linear colliders.
It is fond that the spectrum can be determined by measuring the
accolinearity angle of Bhabha events by tracking device with good
angular resolution. We need, however, 10 fb-1 with minimal acceptance
angle of 45 degrees to get the parameters of the beams with appropriate
accuracies. In order to make the interval of the sampling shorten,
further information of Bhabha events, like the calorimetric energy or
momenta of the tracks, can be used.  We would like to propose to apply
the Baysian parameter estimation or Baysian learning approach to pattern
classification problems to determine the luminosity function.