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Possible Manifestation of a Non-Pointness of the Electron in $e^+e^-$ Annihilation Reaction at Centre of Mass Energies 55-207 GeV / Chen, Yutao (Hefei, CUST) ; Lin, Chih-Hsun (Taiwan, Inst. Phys.) ; Liu, Minghui (Hefei, CUST) ; Sakharov, Alexander S. (Manhattan Coll., Riverdale ; CERN) ; Ulbricht, Jürgen (Zurich, ETH) ; Zhao, Jiawei (Hefei, CUST)
The experimental data from VENUS, TOPAS, OPAL, DELPHI, ALEPH and L3 collaborations, collected from 1989 to 2003, are applied to study the QED framework through direct contact interaction terms approach, using the annihilation reaction $\rm e^+ e^-\rightarrow \gamma\gamma(\gamma)$. The analysis involves performing of a $\chi^{2}$ test to detect the presence of an excited electron $e^{*}$ and evidence of non-point like behavior in the $e^+e^-$ annihilation zone. [...]
arXiv:2210.11149.- 2023-07-10 - 32 p. - Published in : Physics 5 (2023) 752-783 Fulltext: 2210.11149 - PDF; Publication - PDF;

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Appearance of a Minimal Length in $e^+ e^-$ Annihilation / Dymnikova, Irina (Warmia Mazury U. ; Ioffe Phys. Tech. Inst.) ; Sakharov, Alexander (CERN ; Kyungpook Natl. U.) ; Ulbricht, Jürgen (Zurich, ETH)
Experimental data reveal with a 5$\sigma$ significance the existence of a characteristic minimal length $l_e$= 1.57 × 10$^{−17}$ cm at the scale E = 1.253 TeV in the annihilation reaction $e^+e^- \to \gamma\gamma(\gamma)$ . Nonlinear electrodynamics coupled to gravity and satisfying the weak energy condition predicts, for an arbitrary gauge invariant Lagrangian, the existence of spinning charged electromagnetic soliton asymptotically Kerr-Newman for a distant observer with the gyromagnetic ratio g=2 . [...]
2014 - 10 p. - Published in : Adv. High Energy Phys. 2014 (2014) 707812 Hindawi Open Access article: PDF;

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Minimal Length Scale in Annihilation / Dymnikova, Irina (Warmia Mazury U. ; Ioffe Phys. Tech. Inst.) ; Sakharov, Alexander (CERN ; Wayne State U.) ; Ulbricht, Jurgen (Zurich, ETH)
Experimental data suggest the existence of a minimal length scale in annihilation process for the reaction e+e- --> gamma gamma (gamma). [...]
arXiv:0907.0629 ; CERN-PH-TH-2009-105 ; CERN-PH-TH-2009-105. - 2009. - 16 p.
Preprint - Full text

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Test of non point-like behavior of Fermions / Burch, Urs ; Lin, Chih-Hsun ; Rubbia, André ; Sakharov, Alexander S (CERN) ; Ulbricht, Jürgen ; Wu, Jian ; Zhao Jia Wei
We search in measurements from LEP, TRISTAN, CDF, D0 and UA1 for those phenomena beyond the Standard Model where the fundamental particles can exhibit non point‐like behavior. The total and differential cross sections for the reaction e+e− → γγ(γ) measured at center‐of‐mass energies from 55 GeV to 207 GeV are used for a global fit to test the hypothesis of an excited electron and contact interaction induced terms. [...]
2007 - Published in : AIP Conf. Proc. 892 (2007) 468-471
In : Quark Confinement and the Hadron Spectrum, Ponta Delgada, Portugal, 2 - 7 Sep 2006, pp.468-471

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QED test at LEP200 energies in the reaction e[sup + ]e[sup - ] --> gamma gamma(gamma) / Bajo, Angela (Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Avda. Complutense 22, 28040 Madrid, Spain) ; Dymnikova, Irina (Warmia Mazury U.) ; Sakharov, Alexander S (Zurich, ETH) ; Sanchez, Eusebio (Centro de Investigaciones Energeticas, Medioambientales y Tecnologicas, Avda. Complutense 22, 28040 Madrid, Spain) ; Ulbricht, Jurgen (Zurich, ETH) ; Zhao Jia Wei (Hefei, CUST)
2001 - Published in : AIP Conf. Proc. 564 (2001) 255-262
In : 2nd ICTP Workshop on Frontier Tests of Quantum Electrodynamics and Physics of the Vacuum, Trieste, Italy, 5 - 11 Oct 2000, pp.255-262

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