Advanced

Luminosity Measurements and Two-Photon Physics with the DELPHI VSAT at LEP

Jonsson, Per M LU (1998)
Abstract
This thesis describes analysis of data from the DELPHI Very Small Angle Tagger (VSAT) calorimeter at LEP1. The VSAT consists of four Silicon-Tungsten calorimeter modules symmetrically positioned 7.7 meters away from the interaction point. It measures elastically scattered electrons and positrons, Bhabha events, within the polar angular region between 5-12 mrad. Trigger efficiency and reconstruction procedures for the energy and position measurement of VSAT data are described. Off momentum electron background and online luminosity monitoring with the VSAT are also discussed. The extraction of various beamparameters from analysis of the impact point of Bhabha pairs reveal the ability to measure variations in beam angles with a precision of... (More)
This thesis describes analysis of data from the DELPHI Very Small Angle Tagger (VSAT) calorimeter at LEP1. The VSAT consists of four Silicon-Tungsten calorimeter modules symmetrically positioned 7.7 meters away from the interaction point. It measures elastically scattered electrons and positrons, Bhabha events, within the polar angular region between 5-12 mrad. Trigger efficiency and reconstruction procedures for the energy and position measurement of VSAT data are described. Off momentum electron background and online luminosity monitoring with the VSAT are also discussed. The extraction of various beamparameters from analysis of the impact point of Bhabha pairs reveal the ability to measure variations in beam angles with a precision of 50 microrad. The relative luminosity measurement of the VSAT with a precision level of 0.1% for the 1993-1994 Z scan is also presented. Through the study of double-tag two-photon events, using the VSAT for measuring the energy of both scattered electrons, the behaviour of the total hadronic two-photon cross section is for the first time investigated up to invariant masses of 35 GeV. (Less)
Please use this url to cite or link to this publication:
author
opponent
  • Dr Erdmann, Martin, DESY, Germany
organization
publishing date
type
Thesis
publication status
published
subject
keywords
Elementary particle physics, kvantfältteori, Elementarpartikelfysik, quantum field theory, Fysicumarkivet A:1998:Jonsson
pages
133 pages
publisher
Experimental High-Energy Physics
defense location
Lecture hall B, Physics department
defense date
1998-03-06 10:15
external identifiers
  • Other:ISRN: LUNFD6/(NFFL-7152) 1998
language
English
LU publication?
yes
id
1d0dc1ec-c238-4772-81f6-0f7789a244e6 (old id 38413)
date added to LUP
2007-08-01 12:15:19
date last changed
2016-09-19 08:45:06
@misc{1d0dc1ec-c238-4772-81f6-0f7789a244e6,
  abstract     = {This thesis describes analysis of data from the DELPHI Very Small Angle Tagger (VSAT) calorimeter at LEP1. The VSAT consists of four Silicon-Tungsten calorimeter modules symmetrically positioned 7.7 meters away from the interaction point. It measures elastically scattered electrons and positrons, Bhabha events, within the polar angular region between 5-12 mrad. Trigger efficiency and reconstruction procedures for the energy and position measurement of VSAT data are described. Off momentum electron background and online luminosity monitoring with the VSAT are also discussed. The extraction of various beamparameters from analysis of the impact point of Bhabha pairs reveal the ability to measure variations in beam angles with a precision of 50 microrad. The relative luminosity measurement of the VSAT with a precision level of 0.1% for the 1993-1994 Z scan is also presented. Through the study of double-tag two-photon events, using the VSAT for measuring the energy of both scattered electrons, the behaviour of the total hadronic two-photon cross section is for the first time investigated up to invariant masses of 35 GeV.},
  author       = {Jonsson, Per M},
  keyword      = {Elementary particle physics,kvantfältteori,Elementarpartikelfysik,quantum field theory,Fysicumarkivet A:1998:Jonsson},
  language     = {eng},
  pages        = {133},
  publisher    = {ARRAY(0xb2e45a0)},
  title        = {Luminosity Measurements and Two-Photon Physics with the DELPHI VSAT at LEP},
  year         = {1998},
}