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Study of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experiment
The study is based on data collected at the LEP II accelerator during the second period of the Large Electron-Positron collider operations (1996–2000). During that time the DELPHI (DEtector with Lepton, Photon and Hadron Identification) experiment collected about 90 Gb of data on tape corr...
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| Lenguaje: | eng |
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CERN
2004
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| Acceso en línea: | http://cds.cern.ch/record/884814 |
| _version_ | 1780908315486715904 |
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| author | Tyapkin, P |
| author_facet | Tyapkin, P |
| author_sort | Tyapkin, P |
| collection | CERN |
| description | The study is based on data collected at the LEP II accelerator during the second period of the Large Electron-Positron collider operations (1996–2000). During that time the DELPHI (DEtector with Lepton, Photon and Hadron Identification) experiment collected about 90 Gb of data on tape corresponding to 687–691 <italic> pb</italic><super>−1</super> of luminosity. The data obtained by the VSAT (Very Small Angle Tagger) electromagnetic calorimeter was stored and used for luminosity measurements and for gamma-gamma physics analysis. The analysis was concentrated on single and double tag events. Three Monte Carlo sets were generated for years 1998–2000 using) three different generators (PYTHIA, PHOJET and TWOGAM). Gamma-gamma physics at such high energies (189–206 GeV in the c.m.s.) and small polar angles (3–12 mrad) is unique. Background and beam conditions influenced the analysis and were studied in order to obtain a “clean” signal with as little background as possible. The total hadronic cross-sections for different invariant mass were estimated. The upgrade of the VSAT data-taking software and some hardware problems due to aging were also discussed. |
| id | cern-884814 |
| institution | Organización Europea para la Investigación Nuclear |
| language | eng |
| publishDate | 2004 |
| publisher | CERN |
| record_format | invenio |
| spelling | cern-8848142019-09-30T06:29:59Zhttp://cds.cern.ch/record/884814engTyapkin, PStudy of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experimentParticle Physics - ExperimentThe study is based on data collected at the LEP II accelerator during the second period of the Large Electron-Positron collider operations (1996–2000). During that time the DELPHI (DEtector with Lepton, Photon and Hadron Identification) experiment collected about 90 Gb of data on tape corresponding to 687–691 <italic> pb</italic><super>−1</super> of luminosity. The data obtained by the VSAT (Very Small Angle Tagger) electromagnetic calorimeter was stored and used for luminosity measurements and for gamma-gamma physics analysis. The analysis was concentrated on single and double tag events. Three Monte Carlo sets were generated for years 1998–2000 using) three different generators (PYTHIA, PHOJET and TWOGAM). Gamma-gamma physics at such high energies (189–206 GeV in the c.m.s.) and small polar angles (3–12 mrad) is unique. Background and beam conditions influenced the analysis and were studied in order to obtain a “clean” signal with as little background as possible. The total hadronic cross-sections for different invariant mass were estimated. The upgrade of the VSAT data-taking software and some hardware problems due to aging were also discussed.CERNoai:cds.cern.ch:8848142004 |
| spellingShingle | Particle Physics - Experiment Tyapkin, P Study of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experiment |
| title | Study of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experiment |
| title_full | Study of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experiment |
| title_fullStr | Study of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experiment |
| title_full_unstemmed | Study of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experiment |
| title_short | Study of two-photon processes at low $Q^2$ using the Vsat calorimeter in the DELPHI experiment |
| title_sort | study of two-photon processes at low $q^2$ using the vsat calorimeter in the delphi experiment |
| topic | Particle Physics - Experiment |
| url | http://cds.cern.ch/record/884814 |
| work_keys_str_mv | AT tyapkinp studyoftwophotonprocessesatlowq2usingthevsatcalorimeterinthedelphiexperiment |