Browsing Τμήμα Φυσικής / Department of Physics by Title

Now showing items 1378-1397 of 1410

    • Article  

      Variational field theoretic approach to relativistic meson-nucleon scattering 

      Alexandrou, Constantia; Rosenfelder, R.; Schreiber, A. W. (1998)
      Non-perturbative polaron variational methods are applied, within the so-called particle or world-line representation of relativistic field theory, to study scattering in the context of the scalar Wick-Cutkosky model. ...
    • Article  

      Variational treatment of quenched QED using the worldline technique 

      Schreiber, A. W.; Alexandrou, Constantia; Rosenfelder, R. (1998)
    • Article  

      A versatile dielectron trigger for nucleon-nucleon and nucleus-nucleus collisions 

      Schicker, R.; Axiotis, Michael; Tsertos, Haralambos (1998)
      A novel approach for a versatile first level dielectron trigger is presented. This trigger operates in the low multiplicity environment of nucleon-nucleon reactions as well as in the high multiplicity situation of ...
    • Article  

      Vibrational control of electron-transfer reactions: A feasibility study for the fast coherent transfer regime 

      Antoniou, Pavlos; Ma, Z.; Zhang, P.; Beratan, David N.; Skourtis, Spiros S. (2015)
      Molecular vibrations and electron-vibrational interactions are central to the control of biomolecular electron and energy-transfer rates. The vibrational control of molecular electron-transfer reactions by infrared pulses ...
    • Article  

      Vortices and NMR in rotating3He-B 

      Theodorakis, Stavros; Fetter, A. L. (1983)
      The core structure of singly quantized vortices in3He-B is studied in the Ginzburg-Landau regime. For zero magnetic field, variational estimates indicate a core anisotropy
    • Article  

      W Boson + Jet Angular distribution in pp̄ collsions at s=1.8 TeV 

      Frautschi, M.; Abe, F.; Albrow, M. G.; Amidei, D.; Antos, J.; Anway-Wiese, C.; Apollinari, G.; Areti, H.; Atac, M.; Auchincloss, P.; Azfar, F.; Azzi, P.; Bacchetta, N.; Badgett, W.; Bailey, M. W.; Bao, J.; De Barbaro, P.; Barbaro-Galtieri, A.; Barnes, V. E.; Barnett, B. A.; Bartalini, P.; Bauer, G.; Baumann, T.; Bedeschi, F.; Behrends, S.; Belforte, S.; Bellettini, G.; Bellinger, J.; Benjamin, D.; Benlloch, J.; Bensinger, J.; Benton, D.; Beretvas, Andrew; Berge, J. P.; Bertolucci, S.; Bhatti, A.; Biery, K.; Binkley, M.; Bird, F.; Bisello, D.; Blair, R. E.; Blocker, C.; Bodek, A.; Bokhari, W.; Bolognesi, V.; Bortoletto, D.; Boswell, C.; Boulos, T.; Brandenburg, G.; Buckley-Geer, E.; Budd, H. S.; Burkett, K.; Busetto, G.; Byon-Wagner, A.; Byrum, K. L.; Cammerata, J.; Campagnari, C.; Campbell, M.; Caner, A.; Carithers, W.; Carlsmith, D.; Castro, A.; Cen, Y.; Cervelli, F.; Chapman, J.; Cheng, M. T.; Chiarelli, G.; Chikamatsu, T.; Cihangir, S.; Clark, A. G.; Cobal, M.; Contreras, M.; Conway, J.; Cooper, J. M.; Cordelli, M.; Crane, D.; Cunningham, J. D.; Daniels, T.; DeJongh, F.; Delchamps, S.; Dell'Agnello, Simone; Dell'Orso, M.; Demortier, L.; Denby, B.; Deninno, M.; Derwent, P. F.; Devlin, T.; Dickson, M.; Donati, S.; Drucker, R. B.; Dunn, A.; Einsweiler, K.; Elias, John E.; Ely, R.; Engels Jr., E.; Eno, S.; Errede, D.; Errede, S.; Fan, Q.; Farhat, B.; Fiori, I.; Flaugher, B.; Foster, G. W.; Franklin, M.; Freeman, J.; Friedman, J.; Frisch, H.; Fry, A.; Fuess, T. A.; Fukui, Y.; Funaki, S.; Gagliardi, G.; Galeotti, S.; Gallinaro, M.; Garfinkel, A. F.; Geer, S.; Gerdes, D. W.; Giannetti, P.; Giokaris, N.; Giromini, P.; Gladney, L.; Glenzinski, D.; Gold, M.; Gonzalez, J.; Gordon, A.; Goshaw, A. T.; Goulianos, Konstantin; Grassmann, H.; Grewal, A.; Grieco, G.; Groer, L.; Grosso-Pilcher, C.; Haber, C.; Hahn, S. R.; Hamilton, R.; Handler, R.; Hans, R. M.; Hara, K.; Harral, B.; Harris, R. M.; Hauger, S. A.; Hauser, J.; Hawk, C.; Heinrich, J.; Cronin-Hennessy, D.; Hollebeek, R.; Holloway, L.; Hölscher, A.; Hong, S.; Houk, G.; Hu, P.; Huffman, B. T.; Hughes, R.; Hurst, P.; Huston, J.; Huth, J.; Hylen, J.; Incagli, M.; Incandela, J.; Iso, H.; Jensen, H.; Jessop, C. P.; Joshi, U.; Kadel, R. W.; Kajfasz, Eric; Kamon, T.; Kaneko, T.; Kardelis, D. A.; Kasha, H.; Kato, Y.; Keeble, L.; Kennedy, R. D.; Kephart, R.; Kesten, P.; Kestenbaum, D.; Keup, R. M.; Keutelian, H.; Keyvan, F.; Kim, D. H.; Kim, H. S.; Kim, S. B.; Kim, S. H.; Kim, Y. K.; Kirsch, L.; Koehn, P.; Kondo, K.; Konigsberg, J.; Kopp, S.; Kordas, Kostas; Koska, W.; Kovács, Eve V.; Kowald, W.; Krasberg, M.; Kroll, J.; Kruse, M.; Kuhlmann, S. E.; Kuns, E.; Laasanen, A. T.; Labanca, N.; Lammel, S.; Lamoureux, J. I.; LeCompte, T.; Leone, S.; Lewis, J. D.; Limon, P.; Lindgren, M.; Liss, T. M.; Lockyer, N.; Loomis, C.; Long, O.; Loreti, M.; Low, E. H.; Lu, J.; Lucchesi, D.; Luchini, C. B.; Lukens, P.; Maas, P.; Maeshima, K.; Maghakian, A.; Maksimovic, P.; Mangano, M.; Mansour, J.; Mariotti, M.; Marriner, J. P.; Martin, A.; Matthews, J. A. J.; Mattingly, R.; McIntyre, P.; Melese, P.; Menzione, A.; Meschi, E.; Michail, G.; Mikamo, S.; Miller, M.; Miller, R.; Mimashi, T.; Miscetti, S.; Mishina, M.; Mitsushio, H.; Miyashita, S.; Morita, Y.; Moulding, S.; Mueller, J.; Mukherjee, A.; Muller, T.; Musgrave, P.; Nakae, L. F.; Nakano, I.; Nelson, C.; Neuberger, D.; Newman-Holmes, C.; Nodulman, L.; Ogawa, S.; Oh, S. H.; Ohl, K. E.; Oishi, R.; Okusawa, T.; Pagliarone, C.; Paoletti, R.; Papadimitriou, Vaia; Park, S.; Patrick, J.; Pauletta, G.; Paulini, M.; Pescara, L.; Peters, M. D.; Phillips, T. J.; Piacentino, G.; Pillai, M.; Plunkett, R.; Pondrom, L.; Produit, N.; Proudfoot, J.; Ptohos, Fotios; Punzi, G.; Ragan, K.; Rimondi, F.; Ristori, L.; Roach-Bellino, M.; Robertson, W. J.; Rodrigo, T.; Romano, J.; Rosenson, L.; Sakumoto, W. K.; Saltzberg, D.; Sansoni, A.; Scarpine, V.; Schindler, A.; Schlabach, P.; Schmidt, E. E.; Schmidt, M. P.; Schneider, O.; Sciacca, G. F.; Scribano, A.; Segler, S.; Seidel, S.; Seiya, Y.; Sganos, G.; Sgolacchia, A.; Shapiro, M.; Shaw, N. M.; Shen, Q.; Shepard, P. F.; Shimojima, M.; Shochet, M.; Siegrist, J.; Sill, A.; Sinervo, P.; Singh, P.; Skarha, J.; Sliwa, K.; Smith, D. A.; Snider, F. D.; Song, L.; Song, T.; Spalding, J.; Spiegel, L.; Sphicas, Paris A.; Spies, A.; Stanco, L.; Steele, J.; Stefanini, A.; Strahl, K.; Strait, J.; Stuart, D.; Sullivan, G.; Sumorok, K.; Swartz Jr., R. L.; Takahashi, T.; Takikawa, K.; Tartarelli, F.; Taylor, W.; Teramoto, Y.; Tether, S.; Theriot, D.; Thomas, J.; Thomas, T. L.; Thun, R.; Timko, M.; Tipton, P.; Titov, A.; Tkaczyk, S.; Tollefson, K.; Tollestrup, A.; Tonnison, J.; de Trocóniz, J. F.; Tseng, J.; Turcotte, M.; Turini, N.; Uemura, N.; Ukegawa, F.; Unal, G.; Van Den Brink, S.; Vejcik III, S.; Vidal, R.; Vondracek, M.; Wagner, R. G.; Wagner, R. L.; Wainer, N.; Walker, R. C.; Wang, G.; Wang, J.; Wang, M. J.; Wang, Q. F.; Warburton, A.; Watts, G.; Watts, T.; Webb, R.; Wendt, C.; Wenzel, H.; Wester III, W. C.; Westhusing, T.; Wicklund, A. B.; Wicklund, E.; Wilkinson, R.; Williams, H. H.; Wilson, P.; Winer, B. L.; Wolinski, J.; Wu, D. Y.; Wu, X.; Wyss, J.; Yagil, A.; Yao, W.; Yasuoka, K.; Ye, Y.; Yeh, G. P.; Yeh, P.; Yin, M.; Yoh, J.; Yoshida, T.; Yovanovitch, D.; Yu, I.; Yun, J. C.; Zanetti, A.; Zetti, F.; Zhang, L.; Zhang, S.; Zhang, W.; Zucchelli, S. (1994)
      The W+jet angular distribution is measured using W→eν events recorded with the Collider Detector at Fermilab (CDF) during the 1988-89 and 1992-93 Tevatron runs. The data agree well with both a leading order and a next-to-leading ...
    • Article  

      A wave-function for stringy universes 

      Kounnas, Costas; Troost, J.; Toumbas, Nicolaos K. (2007)
    • Article  

      Wavefunction of the universe: Diffeomeorphism invariance and field redefinitions 

      Partouche, Hervé; Toumbas, Nicolaos K.; de Vaulchier, Balthazar (Proceedings of Science (SISSA), 2022-11-23)
      We review some recent results concerning the Hartle-Hawking wavefunction of the universe. We focus on pure Einstein theory of gravity in the presence of a positive cosmological constant. We carefully implement the gauge-fixing ...
    • Article  

      Wavefunction of the universe: Reparametrization invariance and field redefinitions of the minisuperspace path integral 

      Partouche, Hervé; Toumbas, Nicolaos K.; de Vaulchier, Balthazar (Elsevier, 2021-11-03)
      We consider the Hartle–Hawking wavefunction of the universe defined as a Euclidean path integral that satisfies the “no-boundary proposal.” We focus on the simplest minisuperspace model that comprises a single scale factor ...
    • Article  

      Weak e+e- lines from internal pair conversion observed in collisions of 238U with heavy nuclei 

      Heinz, S.; Berdermann, E.; Heine, F.; Joeres, O.; Kienle, P.; Koenig, I.; Koenig, W.; Kozhuharov, C.; Leinberger, U.; Rhein, M.; Schröter, A.; Tsertos, Haralambos (1998)
      We present the results of a Doppler-shift correction to the measured e+e--sum-energy spectra obtained from e+e--coincidence measurements in 238U + 206Pb and 238U + 181Ta collisions at beam energies close to the Coulomb ...
    • Article  

      Wear of a thin surface coating: modelling and experimental investigations 

      Christofides, Constantinos; McHugh, PE; Forn, A.; Picas, JA (2002)
      Many traditional materials are unsuitable for the harsh conditions experienced by high performance engineering components. The use of coatings however can enhance the performance and thus extend the applicability of these ...
    • Article  

      Well-defined fluoro- and carbazole-containing diblock copolymers: Synthesis, characterization and immobilization onto Au-coated silicon surfaces 

      Savva, Ioanna; Demetriou, Maria; Othonos, Andreas S.; Turcu, R.; Popa, A.; Macavei, S.; Krasia‐Christoforou, Theodora (2012)
      A series of well-defined diblock copolymers consisting of 2-(N-carbazolyl)ethyl methacrylate (CbzEMA) and 2,2,3,3,4,4,4-heptafluorobutyl methacrylate (HFBMA) (CbzEMAx-b-HFBMAy) was synthesized by Reversible Addition-Fragmentation ...
    • Article  

      White light emission via cascade Förster energy transfer in (Ga, In)N quantum well/polymer blend hybrid structures 

      Itskos, Grigorios; Belton, C. R.; Heliotis, G.; Watson, I. M.; Dawson, M. D.; Murray, R.; Bradley, D. D. C. (2009)
      We have studied the room-temperature non-radiative energy transfer processes in hybrid structures composed of (Ga, In)N/GaN single quantum wells and semiconducting polymer blend films placed in nanometre-scale proximity. ...
    • Article  

      Wilson loops as precursors 

      Susskind, L.; Toumbas, Nicolaos K. (2000)
    • Article  

      Worldline path integral for the massive Dirac propagator: A four-dimensional approach 

      Alexandrou, Constantia; Rosenfelder, R.; Schreiber, A. W. (1999)
      We simplify and generalize an approach proposed by Di Vecchia and Ravndal to describe a massive Dirac particle in external vector and scalar fields. Two different path integral representations for the propagator are derived ...
    • Article  

      Zn3N2nanowires: Growth, properties and oxidation 

      Zervos, Matthew; Karipi, C.; Othonos, Andreas S. (2013)
      Zinc nitride (Zn3N2) nanowires (NWs) with diameters of 50 to 100 nm and a cubic crystal structure have been grown on 1 nm Au/Al2O3via the reaction of Zn with NH3including H2between 500°C and 600°C. These exhibited an optical ...
    • Article  

      αs from the non-perturbatively renormalised lattice three-gluon vertex 

      Allés, B.; Henty, D. S.; Panagopoulos, Haralambos G.; Parrinello, C.; Pittori, C.; Richards, D. G. (1997)
      We compute the running QCD coupling on the lattice by evaluating two-point and three-point off-shell gluon Green's functions in a fixed gauge and imposing non-perturbative renormalisation conditions on them. Our exploratory ...
    • Article  

      γN → Δ transition form factors in Quenched and NF = 2 QCD 

      Alexandrou, Constantia; de Forcrand, Ph; Lippert, Th; Neff, H.; Negele, J. W.; Schilling, K.; Schroers, W.; Tsapalis, Antonios (2004)
      Calculations of the magnetic dipole, electric quadrupole and Coulomb quadrupole amplitudes for the transition γN → Δ are presented both in quenched QCD and with two flavours of degenerate dynamical quarks. © 2004 Published ...
    • Article  

      Δ(1232) axial charge and form factors from lattice QCD 

      Alexandrou, Constantia; Gregory, E. B.; Korzec, T.; Koutsou, Giannis; Negele, J. W.; Sato, T.; Tsapalis, Antonios (2011)
      We present the first calculation on the Δ axial vector and pseudoscalar form factors using lattice QCD. Two Goldberger-Treiman relations are derived and examined. A combined chiral fit is performed to the nucleon axial ...
    • Article  

      Δ(1232) Dalitz decay in proton-proton collisions at T=1.25 GeV measured with HADES at GSI 

      Adamczewski-Musch, J.; Arnold, O.; Atomssa, E. T.; Behnke, C.; Belounnas, Amel; Belyaev, A.; Berger-Chen, J. C.; Biernat, J.; Blanco, A.; Blume, C.; Böhmer, M.; Bordalo, P.; Chernenko, S.; Chlad, L.; Deveaux, C.; Dreyer, J.; Dybczak, A.; Epple, E.; Fabbietti, L.; Fateev, O.; Filip, P.; Finocchiaro, P.; Fonte, P.; Franco, C.; Friese, J.; Fröhlich, I.; Galatyuk, T.; Garzón, J. A.; Gernhäuser, R.; Golubeva, M.; Guber, F.; Gumberidze, M.; Harabasz, S.; Heinz, T.; Hennino, T.; Hlavac, S.; Höhne, C.; Holzmann, R.; Ierusalimov, A.; Ivashkin, A.; Kämpfer, B.; Karavicheva, T.; Kardan, B.; Koenig, I.; Koenig, W.; Kolb, B. W.; Korcyl, G.; Kornakov, G.; Kotte, R.; Kühn, W.; Kugler, A.; Kunz, T.; Kurepin, A.; Kurilkin, A.; Kurilkin, P.; Ladygin, V.; Lalik, R.; Lapidus, K.; Lebedev, A.; Liu, T.; Lopes, L.; Lorenz, M.; Mahmoud, T.; Maier, L.; Mangiarotti, A.; Markert, J.; Maurus, S.; Metag, V.; Michel, J.; Morinière, E.; Mihaylov, D. M.; Morozov, S.; Müntz, C.; Münzer, R.; Naumann, L.; Nowakowski, K.; Palka, M.; Parpottas, Yiannis; Pechenov, V.; Pechenova, O.; Petousis, Vlassis; Petukhov, O.; Pietraszko, J.; Przygoda, W.; Ramos, S.; Ramstein, B.; Reshetin, A.; Rodriguez-Ramos, P.; Rosier, P.; Rost, A.; Sadovsky, A.; Salabura, P.; Scheib, T.; Schuldes, H.; Schwab, E.; Scozzi, F.; Seck, F.; Sellheim, P.; Siebenson, J.; Silva, L.; Sobolev, Y. G.; Spataro, S.; Ströbele, H.; Stroth, J.; Strzempek, P.; Sturm, C.; Svoboda, O.; Tlusty, P.; Traxler, M.; Tsertos, Haralambos; Usenko, E.; Wagner, V.; Wendisch, C.; Wiebusch, M. G.; Wirth, J.; Zanevsky, Y.; Zumbruch, P.; Sarantsev, A. V. (2017)
      We report on the investigation of Δ(1232) production and decay in proton-proton collisions at a kinetic energy of 1.25 GeV measured with HADES. Exclusive dilepton decay channels ppe+e- and ppe+e-γ have been studied and ...