Luminosity Measurements and Two-Photon Physics with the DELPHI VSAT at LEP
(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:
https://lup.lub.lu.se/record/38413
- author
- Jonsson, Per M LU
- supervisor
- opponent
-
- Dr Erdmann, Martin, DESY, Germany
- organization
- publishing date
- 1998
- 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 10:15:00
- 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
- 2016-04-04 10:44:00
- date last changed
- 2018-11-21 21:00:29
@phdthesis{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}}, keywords = {{Elementary particle physics; kvantfältteori; Elementarpartikelfysik; quantum field theory; Fysicumarkivet A:1998:Jonsson}}, language = {{eng}}, publisher = {{Experimental High-Energy Physics}}, school = {{Lund University}}, title = {{Luminosity Measurements and Two-Photon Physics with the DELPHI VSAT at LEP}}, year = {{1998}}, }