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Dissertations / Theses on the topic 'Electron-positron annihilation'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Moscoso, Michael Douglas. "Electron-positron pair winds /." Digital version accessible at:, 1999. http://wwwlib.umi.com/cr/utexas/main.

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2

Avalos, Victor P. "Positron annihilation investigation of electron irradiated silicon." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1997. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp04/mq23204.pdf.

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3

Turnock, Graham. "Applications of resummation techniques to electron-positron annihilation." Thesis, University of Cambridge, 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.259591.

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4

Nahn, Steven C. (Steven Christopher) 1968. "Pair production of W bosons in electron positron annihilation." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50334.

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5

Michopoulos, Yanos. "Perturbative QCD studies of multijet structures in electron-positron annihilation." Thesis, Durham University, 1987. http://etheses.dur.ac.uk/6702/.

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To investigate the effect in perturbative QCD of multigluon emissions on the transverse momentum distributions of multijet final states in electron-positron annihilation, we use a simplified model based on the approximation that gluons are emitted independently. As a guide to these multigluon emissions, we study the two-gluon contribution in some detail and calculate the Q(_T)-distribution for four-jet events in e(^+)e̅(^-)annihilation, using suitable jet-defining cuts, needed both theoretically, to regularize the soft- and collinear-gluon singularities, as well as experimentally, to group the

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6

Kwan, Pui-ying Rebecca, and 關珮瑩. "The focusing of the HKU positron beam, and an extended design for incorporating secondary electron-positron annihilation lifetimespectroscopy." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2006. http://hub.hku.hk/bib/B36837192.

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7

Kwan, Pui-ying Rebecca. "The focusing of the HKU positron beam, and an extended design for incorporating secondary electron-positron annihilation lifetime spectroscopy." Click to view the E-thesis via HKUTO, 2006. http://sunzi.lib.hku.hk/hkuto/record/B36837192.

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8

Hawkes, C. M. "A study of the reaction esup(+)esup(-)-musup(+)musup(-)(gamma) at centre of mass energies up to 46.78GeV." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.355754.

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9

Ng, Cheuk-kwong, and 吳卓光. "Implementing variable energy positron lifetime spectroscopy based on secondary electron timing from thin carbon foil in transmission geometry." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/207171.

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10

Sterner, Kevin L. "Electron-positron annihilation into photons at √s = 50 to 64 GeV." Diss., Virginia Tech, 1993. http://hdl.handle.net/10919/40450.

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11

Pu, Anle. "Positron annihilation investigation of vacancies in as-grown and electron irradiated diamonds." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk2/ftp01/MQ53210.pdf.

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12

Lerner, Leonid. "Tests of quantum chromodynamics in 4-jet production in electron positron annihilation." Thesis, University of Cambridge, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.306436.

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13

Wechakama, Maneenate. "Multi-messenger constraints and pressure from dark matter annihilation into electron-positron pairs." Phd thesis, Universität Potsdam, 2013. http://opus.kobv.de/ubp/volltexte/2013/6740/.

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Despite striking evidence for the existence of dark matter from astrophysical observations, dark matter has still escaped any direct or indirect detection until today. Therefore a proof for its existence and the revelation of its nature belongs to one of the most intriguing challenges of nowadays cosmology and particle physics. The present work tries to investigate the nature of dark matter through indirect signatures from dark matter annihilation into electron-positron pairs in two different ways, pressure from dark matter annihilation and multi-messenger constraints on the dark matter annihi

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14

Greenshaw, T. J. "A measurement of the c and b quark assymetries in electron positron annihilation." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370415.

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15

Ho, King-fung, and 何競豐. "Some positron annihilation studies on highly doped and supersaturated N-type silicon." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2004. http://hub.hku.hk/bib/B30287108.

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16

Zhang, Yu, and 張毓. "Investigation of the lifetime spectrum of monoenergetic positrons in silicon involving secondary electrons emission from a carbon foil as start signal, and positron annihilation spectroscopy studies of strontium titante." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2013. http://hdl.handle.net/10722/197507.

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A proposed design of the variable energy positron annihilation spectroscopy (VEPALS) system based on secondary electron (SE) emission from a thin carbon foil has been investigated practically. The SE yield and the positron transmission coefficient were investigated as a function of the positron beam energy, the annular electrode potentials, and the column lengths of the annular electrode. The positron lifetime spectra of single crystal p-type silicon(Si) sample under different annular electrode potentials were analyzed. The result gives a supposed annular electrode potential of 1.5 kV. In view

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17

Zhou, Taojun, and 周濤俊. "All-electron and full-potential positron annihilation calculations forintrinsic and defective zinc and zinc oxide." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39634164.

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18

Zhou, Taojun. "All-electron and full-potential positron annihilation calculations for intrinsic and defective zinc and zinc oxide." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/hkuto/record/B39634164.

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19

Lam, Chi-hung. "Positron annihilation spectroscopy studies of 6H N-type silicon carbide and Zn-doped P-type gallium antimonide." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B36299996.

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20

Pouladdej, Ali Carleton University Dissertation Physics. "A study of hadronisation in e[positive]e[negative] annihilation at the Z[superscript degree] using K[superscript degree] mesons." Ottawa, 1992.

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21

Glendinning, I. "A study of inclusive lepton pairs in multihadronic events from electron positron annihilation at PETRA." Thesis, University of Manchester, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.377472.

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22

Lam, Tat-wang. "Construction of a positron-lifetime spectrometer and its application to studying electron irradiation induced defects in 6H silicon carbide." Click to view the E-thesis via HKUTO, 2003. http://sunzi.lib.hku.hk/hkuto/record/B31549913.

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23

To, Chun-kit, and 杜俊傑. "Defect studies of single crystal and thin film zinc oxide by positron annihilation spectroscopy and cathodoluminescence." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2010. http://hub.hku.hk/bib/B4608955X.

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24

Alam, S. (Sher) Carleton University Dissertation Physics. "The one loop radiative corrections to W pair production in electron positron annihilation in the supersymmetric extension of the Salam-Weinberg model of the electroweak interactions." Ottawa, 1992.

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25

Lam, Chi-hung, and 林志雄. "Positron annihilation spectroscopy studies of 6H N-type silicon carbide and Zn-doped P-type gallium antimonide." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B36299996.

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26

Bull, P. S. "A study of specific hadronic final states in electron-positron annihilation at 34GeV centre of mass energy." Thesis, University of Oxford, 1986. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.375226.

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27

Dutschke, Markus [Verfasser], and Liviu [Akademischer Betreuer] Chioncel. "Systematic Analysis of the Lock-Crisp-West Theorem in Electron-Positron Annihilation / Markus Dutschke ; Betreuer: Liviu Chioncel." Augsburg : Universität Augsburg, 2019. http://d-nb.info/1180286197/34.

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28

Dutschke, Markus Thomas [Verfasser], and Liviu [Akademischer Betreuer] Chioncel. "Systematic Analysis of the Lock-Crisp-West Theorem in Electron-Positron Annihilation / Markus Dutschke ; Betreuer: Liviu Chioncel." Augsburg : Universität Augsburg, 2019. http://d-nb.info/1180286197/34.

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29

Deng, Xin, and 鄧欣. "Positron studies of silicon and germanium nanocrystals embedded in silicon dioxide." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B41508749.

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30

Deng, Xin. "Positron studies of silicon and germanium nanocrystals embedded in silicon dioxide." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B41508749.

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31

Lam, Tat-wang, and 林達宏. "Construction of a positron-lifetime spectrometer and its application to studying electron irradiation induced defects in 6H siliconcarbide." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2003. http://hub.hku.hk/bib/B31549913.

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32

[Verfasser], Maneenate Wechakama, and Matthias [Akademischer Betreuer] Steinmetz. "Multi-messenger constraints and pressure from dark matter annihilation into electron-positron pairs / Maneenate Wechakama. Betreuer: Matthias Steinmetz." Potsdam : Universitätsbibliothek der Universität Potsdam, 2013. http://d-nb.info/1041521669/34.

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33

Hasan, Anwarul. "Search for neutralions in electron-positron annihilation at LEP energies : data collected by the L3 detector at CERN /." Zürich, 1995. http://e-collection.ethbib.ethz.ch/show?type=diss&nr=10993.

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Diss. Naturwiss. ETH Zürich, Nr. 10993, 1995. Ref.: Hans Hofer ; Korref.: Maurice Bourquin ; Korref.: Juergen Ulbricht.<br>Am Kopf der Titelseite: Bericht des Instituts für Hochenergiephysik der ETH Zürich.

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34

Hui, I. Pui. "Construction of the preparation, growth and characterization chamber of molecular beam epitaxy system and some studies of the iron-gallium nitride system with a view to spintronics applications." Click to view the E-thesis via HKUTO, 2007. http://sunzi.lib.hku.hk/HKUTO/record/B39558435.

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35

Naik, Pranab Sabitru. "Design and implementation of a fully automated real-time s-parameter imaging system." Thesis, Click to view the E-thesis via HKUTO, 2004. http://sunzi.lib.hku.hk/hkuto/record/B30708758.

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36

Smith, Bryan R. (Bryan Richard) 1971. "High energy pair production of muons in electron-positron annihilation at center of mass energies ranging from 130 to 183Gev." Thesis, Massachusetts Institute of Technology, 1998. http://hdl.handle.net/1721.1/50011.

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37

Hui, I. Pui, and 許貽培. "Construction of the preparation, growth and characterization chamber of molecular beam epitaxy system and some studies of the iron-galliumnitride system with a view to spintronics applications." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2007. http://hub.hku.hk/bib/B39558435.

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38

González, Martirena Saúl. "A calorimetric measurement of the strong coupling constant in electron-positron annihilation at a center-of-mass energy of 91.6 GeV." Thesis, Massachusetts Institute of Technology, 1994. http://hdl.handle.net/1721.1/28139.

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39

Hill, P. V. "A model insensitive determination of the strong coupling constant and a measurement of the energy spread of quark jets in electron positron annihilation." Thesis, University of Manchester, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379148.

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40

Zimnik, Samantha Maria [Verfasser], Christoph P. [Akademischer Betreuer] [Gutachter] Hugenschmidt, and Johannes [Gutachter] Barth. "Surface segregation studied by time-resolved positron annihilation induced Auger electron spectroscopy / Samantha Maria Zimnik ; Gutachter: Johannes Barth, Christoph P. Hugenschmidt ; Betreuer: Christoph P. Hugenschmidt." München : Universitätsbibliothek der TU München, 2017. http://d-nb.info/1135385696/34.

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41

Mariano, Leandro. "Estudo da distribuição de momento de elétrons ligados por correlação ângulo-energia da radiação de aniquilação elétron-pósitron." Universidade de São Paulo, 2010. http://www.teses.usp.br/teses/disponiveis/43/43134/tde-26012011-154606/.

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Neste trabalho foi medido o alargamento Doppler de uma aniquilação elétron pósitron com o uso de um filtro angular. O Filtro angular reduz, substancialmente, a detecção de fótons provenientes de aniquilações de elétrons com baixo momento, enfatizando, desta forma, a contribuição de aniquilações com elétrons fortemente ligados. Foram medidos os espectros de coincidência para os ângulos de corte de 0,28°, 0,42° e 1.2°. Os resultados obtidos mostram que, conforme se aumenta o ângulo de corte, há uma redução das aniquilações com elétrons de valência em proporção muito maior do que para elétrons fo

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42

Huguenin, Denis. "Effets induits par irradiation électronique dans les alliages austénitiques Fe-Ni-Cr." Grenoble 1, 1989. http://www.theses.fr/1989GRE10034.

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43

Kayal, Philip Issa. "Search for vector leptoquarks in electron-positron annihilations at 183 GeV." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape9/PQDD_0027/NQ39550.pdf.

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44

Clarke, P. E. L. "A study of tau leptons in electron-positron annihilations at high energies." Thesis, University of Oxford, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.370242.

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45

Edwards, Adam Jacob. "A study of double-charm and charm-strange baryons in electron-positron annihilations /." May be available electronically:, 2007. http://proquest.umi.com/login?COPT=REJTPTU1MTUmSU5UPTAmVkVSPTI=&clientId=12498.

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46

Hara, Takayuki. "A calculation of fermi energy in selected materials using doppler broadened positron annihilation spectroscopy." Thesis, Georgia Institute of Technology, 1986. http://hdl.handle.net/1853/20238.

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47

Koch, Leonard [Verfasser]. "Search for Resonant X(3872) Formation in Electron Positron Annihilations and the Development of a Prototype Data Acquisition for the Crystal Zero Degree Detector at BESIII / Leonard Koch." Gießen : Universitätsbibliothek, 2019. http://d-nb.info/1188563718/34.

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48

Stone, Howard D. "Experimental Tests of QCD and Fragmentation Models in Electron-Positron Annihilation." Thesis, 1988. https://thesis.library.caltech.edu/7502/1/Stone%201988.pdf.

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<p>This thesis presents a detailed study of the hadronic data obtained with the MARK J detector from e⁺e⁻ annihilation. The predictions of several new combinations of Monte Carlo parton generators and fragmentation schemes have been tuned and compared directly to the data.</p> <p>A study, performed in the limit of perfect detector resolution and efficiency, has shown that the string effect, which some groups claimed to have observed, cannot be attributed to soft gluon coherence effects occurring at the soft perturbative stage of the event evolution.</p> <p>It is found that all the fragme

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49

Pu, Anle. "Positron annihilation investigation of vacancies in as-grown and electron irradiated dia onds." 2000. http://hdl.handle.net/1993/2337.

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Vacancy-type defects in the four main types of diamond (Ia, Ib, IIa and IIb) were investigated using positron lifetime, Doppler broadening and optical absorption spectroscopies. In unirradiated samples vacancy clusters were found in all types, synthetic as well as natural. These clusters are situated in highly defected regions, rather than homogeneously distributed, and their concentration varies significantly from sample to sample. For synthetic Ib diamonds vacancy clusters were investigated as a function of nitrogen content. We have developed a simplified model for the trapping of positrons

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50

Morris, Duncan Andrew. "The Relativistic String in the Caltech-II Model of Hadronization and Electron-Positron Annihilation." Thesis, 1987. https://thesis.library.caltech.edu/11407/1/Morris_DA_1987.pdf.

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<p>This study uses the full equations of motion of the massless relativistic string as a phenomenological model of color flux tubes in the process of hadronization in electron-positron annihilation. Perturbatively generated sets of partons are mapped onto color singlet strings, which fragment according to a generalization of the covariant decay law for point relativistic particles. String evolution is terminated when string masses are a few GeV above particle production threshold. Low-mass strings are decayed into primary hadrons using a parameterization of low-mass data. The complete model, w

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