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1. Evidence for the decay B0→J/ψω and measurement of the relative branching fractions of Bs0 meson decays to J/ψη and J/ψη′

Author: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, L. Anderlini, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J.J. Back, C. Baesso, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, A. Bates, Th. Bauer, A. Bay, J. Beddow, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N.H. Brook, H. Brown, A. Büchler-Germann, I. Burducea, A. Bursche, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, Ch. Cauet, M. Charles, Ph. Charpentier, P. Chen, N. Chiapolini, M. Chrzaszcz, K. Ciba, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, E. Cogneras, P. Collins, A. Comerma-Montells, A. Contu, A. Cook, M. Coombes, G. Corti, B. Couturier, G.A. Cowan, D. Craik, S. Cunliffe, R. Currie, C. DʼAmbrosio, P. David, P.N.Y. David, I. De Bonis, K. De Bruyn, S. De Capua, M. De Cian, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, M. Deckenhoff, H. Degaudenzi, L. Del Buono, C. Deplano, D. Derkach, O. Deschamps, F. Dettori, J. Dickens, H. Dijkstra, P. Diniz Batista, F. Domingo Bonal, S. Donleavy, F. Dordei, A. Dosil Suárez, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, A. Dziurda, A. Dzyuba, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, R. Ekelhof, L. Eklund, I. El Rifai, Ch. Elsasser, D. Elsby, D. Esperante Pereira, A. Falabella, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, F. Ferreira Rodrigues, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, O. Francisco, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, J. Garra Tico, L. Garrido, C. Gaspar, R. Gauld, E. Gersabeck, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, E. Greening, S. Gregson, O. Grünberg, B. Gui, E. Gushchin, Yu. Guz, T. Gys, C. Hadjivasiliou, G. Haefeli, C. Haen, S.C. Haines, S. Hall, T. Hampson, S. Hansmann-Menzemer, N. Harnew, S.T. Harnew, J. Harrison, P.F. Harrison, T. Hartmann, J. He, V. Heijne, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, E. Hicks, D. Hill, M. Hoballah, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, N. Hussain, R.S. Huston, D. Hutchcroft, D. Hynds, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, A. Jaeger, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, M. Kaballo, S. Kandybei, M. Karacson, M. Karbach, J. Keaveney, I.R. Kenyon, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, O. Kochebina, I. Komarov, V. Komarov, R.F. Koopman, P. Koppenburg, M. Korolev, A. Kozlinskiy, L. Kravchuk, K. Kreplin, M. Kreps, G. Krocker, P. Krokovny, F. Kruse, M. Kucharczyk, V. Kudryavtsev, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, D. Lambert, R.W. Lambert, E. Lanciotti, G. Lanfranchi, C. Langenbruch, T. Latham, C. Lazzeroni, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, L. Li, Y. Li, L. Li Gioi, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J. von Loeben, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, H. Lu, J. Luisier, A. Mac Raighne, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, M. Maino, S. Malde, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, M. Martinelli, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, E. Maurice, A. Mazurov, J. McCarthy, G. McGregor, R. McNulty, M. Meissner, M. Merk, J. Merkel, D.A. Milanes, M.-N. Minard, J. Molina Rodriguez, S. Monteil, D. Moran, P. Morawski, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, B. Muryn, B. Muster, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, I. Nasteva, M. Needham, N. Neufeld, A.D. Nguyen, C. Nguyen-Mau, M. Nicol, V. Niess, N. Nikitin, T. Nikodem, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, S. Ogilvy, O. Okhrimenko, R. Oldeman, M. Orlandea, J.M. Otalora Goicochea, P. Owen, B.K. Pal, A. Palano, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, G. Pessina, K. Petridis, A. Petrolini, A. Phan, E. Picatoste Olloqui, B. Pie Valls, B. Pietrzyk, T. Pilař, D. Pinci, S. Playfer, M. Plo Casasus, F. Polci, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, J. Prisciandaro, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, M.S. Rangel, I. Raniuk, N. Rauschmayr, G. Raven, S. Redford, M.M. Reid, A.C. dos Reis, S. Ricciardi, A. Richards, K. Rinnert, V. Rives Molina, D.A. Roa Romero, P. Robbe, E. Rodrigues, P. Rodriguez Perez, G.J. Rogers, S. Roiser, V. Romanovsky, A. Romero Vidal, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, B. Sanmartin Sedes, M. Sannino, R. Santacesaria, C. Santamarina Rios, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, H. Schindler, S. Schleich, M. Schlupp, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, B. Sciascia, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, I. Sepp, N. Serra, J. Serrano, P. Seyfert, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, R. Silva Coutinho, T. Skwarnicki, N.A. Smith, E. Smith, M. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, F. Soomro, D. Souza, B. Souza De Paula, B. Spaan, A. Sparkes, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stoica, S. Stone, B. Storaci, M. Straticiuc, U. Straumann, V.K. Subbiah, S. Swientek, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, M. Teklishyn, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Tolk, S. Topp-Joergensen, N. Torr, E. Tournefier, S. Tourneur, M.T. Tran, A. Tsaregorodtsev, N. Tuning, M. Ubeda Garcia, A. Ukleja, D. Urner, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, G. Veneziano, M. Vesterinen, B. Viaud, I. Videau, D. Vieira, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, V. Vorobyev, H. Voss, C. Voß, R. Waldi, R. Wallace, S. Wandernoth, J. Wang, D.R. Ward, N.K. Watson, A.D. Webber, D. Websdale, M. Whitehead, J. Wicht, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, S. Wright, S. Wu, K. Wyllie, Y. Xie, F. Xing, Z. Xing, Z. Yang, R. Young, X. Yuan, O. Yushchenko, M. Zangoli, M. Zavertyaev, F. Zhang, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, and A. Zvyagin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Nuclear magnetic resonance, Meson, 010308 nuclear & particles physics, 0103 physical sciences, High Energy Physics::Experiment, Nuclear Experiment, 010306 general physics, 01 natural sciences, Omega, Production rate
Abstract: First evidence of the $B^0\to J/\psi\omega$ decay is found and the $B_{s}^0\to J/\psi\eta$ and $B_{s}^0\to J/\psi\eta^{\prime}$ decays are studied using a dataset corresponding to an integrated luminosity of 1.0 $\mathrm{fb}^{-1}$ collected by the LHCb experiment in proton-proton collisions at a centre-of-mass energy of $\sqrt{s} = 7$ TeV. The branching fractions of these decays are measured relative to that of the $\mathrm{B}^0\to J/\psi\rho^0$ decay: $$\frac{Br(B^0\to J/\psi\omega)}{Br(B^0\to J/\psi\rho^0)} = 0.89 \pm0.19(stat)^{+0.07}_{-0.13}(syst)$$ $$\frac{Br(B^0_s\to J/\psi\eta)}{Br(B^0\to J/\psi\rho^0)} = 14.0 \pm 1.2(stat)^{+1.1}_{-1.5}(syst)^{+1.1}_{-1.0}(\frac{f_d}{f_s}),$$ $$\frac{Br(B^0_s\to J/\psi\eta^{\prime})}{Br(B^0\to J/\psi\rho^0)} = 12.7\pm1.1(stat)^{+0.5}_{-1.3}(syst)^{+1.0}_{-0.9}(\frac{f_d}{f_s}),$$ where the last uncertainty is due to the knowledge of $f_d/f_s$, the ratio of b-quark hadronization factors that accounts for the different production rate of $B^0$ and $B^0_s$ mesons. The ratio of the branching fractions of $B^0_s\to J/\psi\eta^{\prime}$ and $B^0_s\to J/\psi\eta$ decays is measured to be $$ \frac{Br(B^0_s\to J/\psi\eta^{\prime})}{Br(B^0_s\to J/\psi\eta)} = 0.90\pm0.09(stat)^{+0.06}_{-0.02}(syst).$$
Published: 2013
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2. A model-independent Dalitz plot analysis of B±→DK± with D→KS0h+h− (h=π,K) decays and constraints on the CKM angle γ

Author: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, L. Anderlini, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J.J. Back, C. Baesso, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, A. Bates, Th. Bauer, A. Bay, J. Beddow, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, A. Berezhnoy, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N.H. Brook, H. Brown, A. Büchler-Germann, I. Burducea, A. Bursche, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, Ch. Cauet, M. Charles, Ph. Charpentier, P. Chen, N. Chiapolini, M. Chrzaszcz, K. Ciba, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, E. Cogneras, P. Collins, A. Comerma-Montells, A. Contu, A. Cook, M. Coombes, G. Corti, B. Couturier, G.A. Cowan, D. Craik, S. Cunliffe, R. Currie, C. DʼAmbrosio, P. David, P.N.Y. David, I. De Bonis, K. De Bruyn, S. De Capua, M. De Cian, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, M. Deckenhoff, H. Degaudenzi, L. Del Buono, C. Deplano, D. Derkach, O. Deschamps, F. Dettori, A. Di Canto, J. Dickens, H. Dijkstra, P. Diniz Batista, F. Domingo Bonal, S. Donleavy, F. Dordei, A. Dosil Suárez, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, A. Dziurda, A. Dzyuba, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, S. Eisenhardt, R. Ekelhof, L. Eklund, I. El Rifai, Ch. Elsasser, D. Elsby, D. Esperante Pereira, A. Falabella, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, F. Ferreira Rodrigues, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, O. Francisco, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, P. Garosi, J. Garra Tico, L. Garrido, C. Gaspar, R. Gauld, E. Gersabeck, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, E. Greening, S. Gregson, O. Grünberg, B. Gui, E. Gushchin, Yu. Guz, T. Gys, C. Hadjivasiliou, G. Haefeli, C. Haen, S.C. Haines, S. Hall, T. Hampson, S. Hansmann-Menzemer, N. Harnew, S.T. Harnew, J. Harrison, P.F. Harrison, T. Hartmann, J. He, V. Heijne, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, E. Hicks, D. Hill, M. Hoballah, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, N. Hussain, D. Hutchcroft, D. Hynds, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, A. Jaeger, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, M. Kaballo, S. Kandybei, M. Karacson, T.M. Karbach, J. Keaveney, I.R. Kenyon, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, O. Kochebina, V. Komarov, R.F. Koopman, P. Koppenburg, M. Korolev, A. Kozlinskiy, L. Kravchuk, K. Kreplin, M. Kreps, G. Krocker, P. Krokovny, F. Kruse, M. Kucharczyk, V. Kudryavtsev, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, D. Lambert, R.W. Lambert, E. Lanciotti, G. Lanfranchi, C. Langenbruch, T. Latham, C. Lazzeroni, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, Y. Li, L. Li Gioi, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J. von Loeben, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, H. Lu, J. Luisier, A. Mac Raighne, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, M. Maino, S. Malde, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, M. Martinelli, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, E. Maurice, A. Mazurov, J. McCarthy, G. McGregor, R. McNulty, M. Meissner, M. Merk, J. Merkel, D.A. Milanes, M.-N. Minard, J. Molina Rodriguez, S. Monteil, D. Moran, P. Morawski, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, B. Muryn, B. Muster, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, I. Nasteva, M. Needham, N. Neufeld, A.D. Nguyen, C. Nguyen-Mau, M. Nicol, V. Niess, N. Nikitin, T. Nikodem, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, S. Ogilvy, O. Okhrimenko, R. Oldeman, M. Orlandea, J.M. Otalora Goicochea, P. Owen, B.K. Pal, A. Palano, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, G. Pessina, K. Petridis, A. Petrolini, A. Phan, E. Picatoste Olloqui, B. Pie Valls, B. Pietrzyk, T. Pilař, D. Pinci, S. Playfer, M. Plo Casasus, F. Polci, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, J. Prisciandaro, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, M.S. Rangel, I. Raniuk, N. Rauschmayr, G. Raven, S. Redford, M.M. Reid, A.C. dos Reis, S. Ricciardi, A. Richards, K. Rinnert, V. Rives Molina, D.A. Roa Romero, P. Robbe, E. Rodrigues, P. Rodriguez Perez, G.J. Rogers, S. Roiser, V. Romanovsky, A. Romero Vidal, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, B. Sanmartin Sedes, M. Sannino, R. Santacesaria, C. Santamarina Rios, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, P. Schaack, M. Schiller, H. Schindler, S. Schleich, M. Schlupp, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, B. Sciascia, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, I. Sepp, N. Serra, J. Serrano, P. Seyfert, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, R. Silva Coutinho, T. Skwarnicki, N.A. Smith, E. Smith, M. Smith, K. Sobczak, F.J.P. Soler, F. Soomro, D. Souza, B. Souza De Paula, B. Spaan, A. Sparkes, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stoica, S. Stone, B. Storaci, M. Straticiuc, U. Straumann, V.K. Subbiah, S. Swientek, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, M. Teklishyn, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Tolk, D. Tonelli, S. Topp-Joergensen, N. Torr, E. Tournefier, S. Tourneur, M.T. Tran, A. Tsaregorodtsev, P. Tsopelas, N. Tuning, M. Ubeda Garcia, A. Ukleja, D. Urner, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, G. Veneziano, M. Vesterinen, B. Viaud, I. Videau, D. Vieira, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, V. Vorobyev, H. Voss, C. Voß, R. Waldi, R. Wallace, S. Wandernoth, J. Wang, D.R. Ward, N.K. Watson, A.D. Webber, D. Websdale, M. Whitehead, J. Wicht, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, S. Wright, S. Wu, K. Wyllie, Y. Xie, F. Xing, Z. Xing, Z. Yang, R. Young, X. Yuan, O. Yushchenko, M. Zangoli, M. Zavertyaev, F. Zhang, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, and A. Zvyagin
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Amplitude, 010308 nuclear & particles physics, 0103 physical sciences, Pi, Dalitz plot, CP violation, 010306 general physics, 01 natural sciences
Abstract: A binned Dalitz plot analysis of $B^\pm \to D K^\pm$ decays, with $D \to K^0_{\rm S} \pi^+\pi^-$ and $D \to K^0_{\rm S} K^+ K^-$, is performed to measure the CP-violating observables $x_{\pm}$ and $y_{\pm}$ which are sensitive to the CKM angle $\gamma$. The analysis exploits 1.0 $\rm fb^{-1}$ of data collected by the LHCb experiment. The study makes no model-based assumption on the variation of the strong phase of the D decay amplitude over the Dalitz plot, but uses measurements of this quantity from CLEO-c as input. The values of the parameters are found to be $x_- = (0.0 \pm 4.3 \pm 1.5 \pm 0.6) \times 10^{-2}$, $y_- = (2.7 \pm 5.2 \pm 0.8 \pm 2.3) \times 10^{-2}$, $x_+ = (-10.3 \pm 4.5 \pm 1.8 \pm 1.4)\times 10^{-2}$ and $y_+ = (-0.9 \pm 3.7 \pm 0.8 \pm 3.0)\times 10^{-2}$. The first, second, and third uncertainties are the statistical, the experimental systematic, and the error associated with the precision of the strong-phase parameters measured at CLEO-c, respectively. These results correspond to $\gamma = (44^{\,+43}_{\,-38})^\circ$, with a second solution at $\gamma \to \gamma + 180^\circ$, and $r_B = 0.07 \pm 0.04$, where $r_B$ is the ratio between the suppressed and favoured B decay amplitudes.
Published: 2012
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3. Measurement of the CP-violating phase ϕs in B¯s0→J/ψπ+π− decays

Author: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J.J. Back, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, A. Bates, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N.H. Brook, H. Brown, K. de Bruyn, A. Büchler-Germann, I. Burducea, A. Bursche, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, Ch. Cauet, M. Charles, Ph. Charpentier, N. Chiapolini, K. Ciba, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, P. Collins, A. Comerma-Montells, A. Contu, A. Cook, M. Coombes, G. Corti, B. Couturier, G.A. Cowan, R. Currie, C. DʼAmbrosio, P. David, P.N.Y. David, I. De Bonis, S. De Capua, M. De Cian, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, M. Deckenhoff, H. Degaudenzi, L. Del Buono, C. Deplano, D. Derkach, O. Deschamps, F. Dettori, J. Dickens, H. Dijkstra, P. Diniz Batista, F. Domingo Bonal, S. Donleavy, F. Dordei, A. Dosil Suárez, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, A. Dziurda, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, R. Ekelhof, L. Eklund, Ch. Elsasser, D. Elsby, D. Esperante Pereira, A. Falabella, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, O. Francisco, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, J. Garra Tico, L. Garrido, D. Gascon, C. Gaspar, R. Gauld, N. Gauvin, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, E. Greening, S. Gregson, B. Gui, E. Gushchin, Yu. Guz, T. Gys, C. Hadjivasiliou, G. Haefeli, C. Haen, S.C. Haines, T. Hampson, S. Hansmann-Menzemer, R. Harji, N. Harnew, J. Harrison, P.F. Harrison, T. Hartmann, J. He, V. Heijne, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, E. Hicks, K. Holubyev, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, R.S. Huston, D. Hutchcroft, D. Hynds, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, A. Jaeger, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, M. Kaballo, S. Kandybei, M. Karacson, T.M. Karbach, J. Keaveney, I.R. Kenyon, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, M. Knecht, R.F. Koopman, P. Koppenburg, M. Korolev, A. Kozlinskiy, L. Kravchuk, K. Kreplin, M. Kreps, G. Krocker, P. Krokovny, F. Kruse, K. Kruzelecki, M. Kucharczyk, V. Kudryavtsev, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, D. Lambert, R.W. Lambert, E. Lanciotti, G. Lanfranchi, C. Langenbruch, T. Latham, C. Lazzeroni, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, L. Li, L. Li Gioi, M. Lieng, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J. von Loeben, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, H. Lu, J. Luisier, A. Mac Raighne, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, S. Malde, R.M.D. Mamunur, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, M. Martinelli, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, E. Maurice, B. Maynard, A. Mazurov, G. McGregor, R. McNulty, M. Meissner, M. Merk, J. Merkel, S. Miglioranzi, D.A. Milanes, M.-N. Minard, J. Molina Rodriguez, S. Monteil, D. Moran, P. Morawski, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, B. Muryn, B. Muster, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, I. Nasteva, M. Needham, N. Neufeld, A.D. Nguyen, C. Nguyen-Mau, M. Nicol, V. Niess, N. Nikitin, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, S. Ogilvy, O. Okhrimenko, R. Oldeman, M. Orlandea, J.M. Otalora Goicochea, P. Owen, B. Pal, J. Palacios, A. Palano, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, S.K. Paterson, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, G. Pessina, A. Petrolini, A. Phan, E. Picatoste Olloqui, B. Pie Valls, B. Pietrzyk, T. Pilař, D. Pinci, R. Plackett, S. Playfer, M. Plo Casasus, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, J. Prisciandaro, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, M.S. Rangel, I. Raniuk, G. Raven, S. Redford, M.M. Reid, A.C. dos Reis, S. Ricciardi, A. Richards, K. Rinnert, D.A. Roa Romero, P. Robbe, E. Rodrigues, F. Rodrigues, P. Rodriguez Perez, G.J. Rogers, S. Roiser, V. Romanovsky, M. Rosello, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, M. Sannino, R. Santacesaria, C. Santamarina Rios, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, H. Schindler, S. Schleich, M. Schlupp, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, B. Sciascia, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, I. Sepp, N. Serra, J. Serrano, P. Seyfert, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, R. Silva Coutinho, T. Skwarnicki, N.A. Smith, E. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, F. Soomro, B. Souza De Paula, B. Spaan, A. Sparkes, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stoica, S. Stone, B. Storaci, M. Straticiuc, U. Straumann, V.K. Subbiah, S. Swientek, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Topp-Joergensen, N. Torr, E. Tournefier, S. Tourneur, M.T. Tran, A. Tsaregorodtsev, N. Tuning, M. Ubeda Garcia, A. Ukleja, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, B. Viaud, I. Videau, D. Vieira, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, H. Voss, R. Waldi, S. Wandernoth, J. Wang, D.R. Ward, N.K. Watson, A.D. Webber, D. Websdale, M. Whitehead, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, K. Wyllie, Y. Xie, F. Xing, Z. Xing, Z. Yang, R. Young, O. Yushchenko, M. Zangoli, M. Zavertyaev, F. Zhang, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, and A. Zvyagin
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Physics beyond the Standard Model, 0103 physical sciences, Phase (waves), Pi, CP violation, 010306 general physics, 01 natural sciences, Standard Model
Abstract: Measurement of the mixing-induced CP-violating phase ϕs in decays is of prime importance in probing new physics. Here 7421±105 signal events from the dominantly CP-odd final state J/ψπ+π− are selected in 1 fb−1 of pp collision data collected at with the LHCb detector. A time-dependent fit to the data yields a value of , consistent with the Standard Model expectation. No evidence of direct CP violation is found.
Published: 2012
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4. Measurement of the Ds+−Ds− production asymmetry in 7 TeV pp collisions

Author: R. Aaij, C. Abellan Beteta, A. Adametz, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J.J. Back, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, A. Bates, C. Bauer, Th. Bauer, A. Bay, J. Beddow, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N.H. Brook, H. Brown, A. Büchler-Germann, I. Burducea, A. Bursche, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, Ch. Cauet, M. Charles, Ph. Charpentier, N. Chiapolini, M. Chrzaszcz, K. Ciba, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, E. Cogneras, P. Collins, A. Comerma-Montells, A. Contu, A. Cook, M. Coombes, G. Corti, B. Couturier, G.A. Cowan, R. Currie, C. DʼAmbrosio, P. David, P.N.Y. David, I. De Bonis, K. De Bruyn, S. De Capua, M. De Cian, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, M. Deckenhoff, H. Degaudenzi, L. Del Buono, C. Deplano, D. Derkach, O. Deschamps, F. Dettori, J. Dickens, H. Dijkstra, P. Diniz Batista, F. Domingo Bonal, S. Donleavy, F. Dordei, A. Dosil Suárez, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, A. Dziurda, A. Dzyuba, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, R. Ekelhof, L. Eklund, Ch. Elsasser, D. Elsby, D. Esperante Pereira, A. Falabella, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, O. Francisco, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, J. Garra Tico, L. Garrido, D. Gascon, C. Gaspar, R. Gauld, N. Gauvin, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, E. Greening, S. Gregson, O. Grünberg, B. Gui, E. Gushchin, Yu. Guz, T. Gys, C. Hadjivasiliou, G. Haefeli, C. Haen, S.C. Haines, T. Hampson, S. Hansmann-Menzemer, N. Harnew, J. Harrison, P.F. Harrison, T. Hartmann, J. He, V. Heijne, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, E. Hicks, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, R.S. Huston, D. Hutchcroft, D. Hynds, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, A. Jaeger, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, M. Kaballo, S. Kandybei, M. Karacson, T.M. Karbach, J. Keaveney, I.R. Kenyon, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, M. Knecht, I. Komarov, R.F. Koopman, P. Koppenburg, M. Korolev, A. Kozlinskiy, L. Kravchuk, K. Kreplin, M. Kreps, G. Krocker, P. Krokovny, F. Kruse, K. Kruzelecki, M. Kucharczyk, V. Kudryavtsev, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, D. Lambert, R.W. Lambert, E. Lanciotti, G. Lanfranchi, C. Langenbruch, T. Latham, C. Lazzeroni, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, L. Li, Y. Li, L. Li Gioi, M. Lieng, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J. von Loeben, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, H. Lu, J. Luisier, A. Mac Raighne, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, S. Malde, R.M.D. Mamunur, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, M. Martinelli, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, E. Maurice, B. Maynard, A. Mazurov, G. McGregor, R. McNulty, M. Meissner, M. Merk, J. Merkel, S. Miglioranzi, D.A. Milanes, M.-N. Minard, J. Molina Rodriguez, S. Monteil, D. Moran, P. Morawski, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, B. Muryn, B. Muster, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, I. Nasteva, M. Needham, N. Neufeld, A.D. Nguyen, C. Nguyen-Mau, M. Nicol, V. Niess, N. Nikitin, T. Nikodem, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, S. Ogilvy, O. Okhrimenko, R. Oldeman, M. Orlandea, J.M. Otalora Goicochea, P. Owen, B.K. Pal, J. Palacios, A. Palano, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, S.K. Paterson, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, G. Pessina, A. Petrolini, A. Phan, E. Picatoste Olloqui, B. Pie Valls, B. Pietrzyk, T. Pilař, D. Pinci, R. Plackett, S. Playfer, M. Plo Casasus, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, J. Prisciandaro, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, M.S. Rangel, I. Raniuk, G. Raven, S. Redford, M.M. Reid, A.C. dos Reis, S. Ricciardi, A. Richards, K. Rinnert, D.A. Roa Romero, P. Robbe, E. Rodrigues, F. Rodrigues, P. Rodriguez Perez, G.J. Rogers, S. Roiser, V. Romanovsky, M. Rosello, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, M. Sannino, R. Santacesaria, C. Santamarina Rios, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, H. Schindler, S. Schleich, M. Schlupp, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, B. Sciascia, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, I. Sepp, N. Serra, J. Serrano, P. Seyfert, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, R. Silva Coutinho, T. Skwarnicki, N.A. Smith, E. Smith, M. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, F. Soomro, B. Souza De Paula, B. Spaan, A. Sparkes, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stoica, S. Stone, B. Storaci, M. Straticiuc, U. Straumann, V.K. Subbiah, S. Swientek, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Tolk, S. Topp-Joergensen, N. Torr, E. Tournefier, S. Tourneur, M.T. Tran, A. Tsaregorodtsev, N. Tuning, M. Ubeda Garcia, A. Ukleja, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, B. Viaud, I. Videau, D. Vieira, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, V. Vorobyev, C. Voß, H. Voss, R. Waldi, R. Wallace, S. Wandernoth, J. Wang, D.R. Ward, N.K. Watson, A.D. Webber, D. Websdale, M. Whitehead, J. Wicht, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, S. Wright, S. Wu, K. Wyllie, Y. Xie, F. Xing, Z. Xing, Z. Yang, R. Young, X. Yuan, O. Yushchenko, M. Zangoli, M. Zavertyaev, F. Zhang, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, and A. Zvyagin
Subjects: Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences, 7. Clean energy
Published: 2012
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5. Measurement of the CP violating phase ϕs in B¯s0→J/ψf0(980)

Author: R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, G. Alkhazov, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, F. Archilli, L. Arrabito, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, J.J. Back, D.S. Bailey, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, W. Barter, A. Bates, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, S. Belogurov, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, S. Benson, J. Benton, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, T. Bird, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, D. Brett, M. Britsch, T. Britton, N.H. Brook, H. Brown, A. Büchler-Germann, I. Burducea, A. Bursche, J. Buytaert, S. Cadeddu, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, Ch. Cauet, M. Charles, Ph. Charpentier, N. Chiapolini, K. Ciba, X. Cid Vidal, G. Ciezarek, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, P. Collins, A. Comerma-Montells, F. Constantin, A. Contu, A. Cook, M. Coombes, G. Corti, G.A. Cowan, R. Currie, C. DʼAmbrosio, P. David, P.N.Y. David, I. De Bonis, S. De Capua, M. De Cian, F. De Lorenzi, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, M. Deckenhoff, H. Degaudenzi, L. Del Buono, C. Deplano, D. Derkach, O. Deschamps, F. Dettori, J. Dickens, H. Dijkstra, P. Diniz Batista, F. Domingo Bonal, S. Donleavy, F. Dordei, A. Dosil Suárez, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, A. Dziurda, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, R. Ekelhof, L. Eklund, Ch. Elsasser, D. Elsby, D. Esperante Pereira, L. Estève, A. Falabella, E. Fanchini, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, M. Fontana, F. Fontanelli, R. Forty, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, J. Garra Tico, L. Garrido, D. Gascon, C. Gaspar, N. Gauvin, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, E. Greening, S. Gregson, B. Gui, E. Gushchin, Yu. Guz, T. Gys, G. Haefeli, C. Haen, S.C. Haines, T. Hampson, S. Hansmann-Menzemer, R. Harji, N. Harnew, J. Harrison, P.F. Harrison, T. Hartmann, J. He, V. Heijne, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, E. Hicks, K. Holubyev, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, R.S. Huston, D. Hutchcroft, D. Hynds, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, A. Jaeger, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, M. Kaballo, S. Kandybei, M. Karacson, T.M. Karbach, J. Keaveney, I.R. Kenyon, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, M. Knecht, P. Koppenburg, A. Kozlinskiy, L. Kravchuk, K. Kreplin, M. Kreps, G. Krocker, P. Krokovny, F. Kruse, K. Kruzelecki, M. Kucharczyk, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, D. Lambert, R.W. Lambert, E. Lanciotti, G. Lanfranchi, C. Langenbruch, T. Latham, C. Lazzeroni, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, L. Li, L. Li Gioi, M. Lieng, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J. von Loeben, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, H. Lu, J. Luisier, A. Mac Raighne, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, S. Malde, R.M.D. Mamunur, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, E. Maurice, B. Maynard, A. Mazurov, G. McGregor, R. McNulty, M. Meissner, M. Merk, J. Merkel, R. Messi, S. Miglioranzi, D.A. Milanes, M.-N. Minard, J. Molina Rodriguez, S. Monteil, D. Moran, P. Morawski, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, B. Muryn, B. Muster, M. Musy, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, I. Nasteva, M. Nedos, M. Needham, N. Neufeld, C. Nguyen-Mau, M. Nicol, V. Niess, N. Nikitin, A. Nomerotski, A. Novoselov, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, S. Ogilvy, O. Okhrimenko, R. Oldeman, M. Orlandea, J.M. Otalora Goicochea, P. Owen, K. Pal, J. Palacios, A. Palano, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, S.K. Paterson, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, M. Perrin-Terrin, G. Pessina, A. Petrella, A. Petrolini, A. Phan, E. Picatoste Olloqui, B. Pie Valls, B. Pietrzyk, T. Pilař, D. Pinci, R. Plackett, S. Playfer, M. Plo Casasus, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, J. Prisciandaro, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, M.S. Rangel, I. Raniuk, G. Raven, S. Redford, M.M. Reid, A.C. dos Reis, S. Ricciardi, K. Rinnert, D.A. Roa Romero, P. Robbe, E. Rodrigues, F. Rodrigues, P. Rodriguez Perez, G.J. Rogers, S. Roiser, V. Romanovsky, M. Rosello, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, M. Sannino, R. Santacesaria, C. Santamarina Rios, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, S. Schleich, M. Schlupp, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, B. Sciascia, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, I. Sepp, N. Serra, J. Serrano, P. Seyfert, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, R. Silva Coutinho, T. Skwarnicki, A.C. Smith, N.A. Smith, E. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, F. Soomro, B. Souza De Paula, B. Spaan, A. Sparkes, P. Spradlin, F. Stagni, S. Stahl, O. Steinkamp, S. Stoica, S. Stone, B. Storaci, M. Straticiuc, U. Straumann, V.K. Subbiah, S. Swientek, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Topp-Joergensen, N. Torr, E. Tournefier, M.T. Tran, A. Tsaregorodtsev, N. Tuning, M. Ubeda Garcia, A. Ukleja, P. Urquijo, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, B. Viaud, I. Videau, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Volyanskyy, D. Voong, A. Vorobyev, H. Voss, S. Wandernoth, J. Wang, D.R. Ward, N.K. Watson, A.D. Webber, D. Websdale, M. Whitehead, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, K. Wyllie, Y. Xie, F. Xing, Z. Xing, Z. Yang, R. Young, O. Yushchenko, M. Zavertyaev, F. Zhang, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, E. Zverev, and A. Zvyagin
Subjects: Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, Detector, Mass spectrum, Analytical chemistry, High Energy Physics::Experiment, 010306 general physics, 01 natural sciences
Abstract: The decay Bs -> J/\psi K+ K- is investigated using 0.16/fb of data collected with the LHCb detector using 7 TeV pp collisions. Although the J/\psi \phi\ channel is well known, final states at higher K+K- masses have not previously been studied. In the K+K- mass spectrum we observe a significant signal in the f'2(1525) region as well as a non-resonant component. After subtracting the non-resonant component, we find B(Bs->J/\psi f'_2(1525))/B(Bs->J/\psi \phi)=(26.4 +/- 2.7 +/- 2.4)%.
Published: 2012
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6. Search for the rare decays Bs0→μ+μ− and B0→μ+μ−

Author: R. Aaij, B. Adeva, M. Adinolfi, C. Adrover, A. Affolder, Z. Ajaltouni, J. Albrecht, F. Alessio, M. Alexander, P. Alvarez Cartelle, A.A. Alves, S. Amato, Y. Amhis, J. Amoraal, J. Anderson, R.B. Appleby, O. Aquines Gutierrez, L. Arrabito, M. Artuso, E. Aslanides, G. Auriemma, S. Bachmann, D.S. Bailey, V. Balagura, W. Baldini, R.J. Barlow, C. Barschel, S. Barsuk, A. Bates, C. Bauer, Th. Bauer, A. Bay, I. Bediaga, K. Belous, I. Belyaev, E. Ben-Haim, M. Benayoun, G. Bencivenni, R. Bernet, M.-O. Bettler, M. van Beuzekom, A. Bien, S. Bifani, A. Bizzeti, P.M. Bjørnstad, T. Blake, F. Blanc, C. Blanks, J. Blouw, S. Blusk, A. Bobrov, V. Bocci, A. Bondar, N. Bondar, W. Bonivento, S. Borghi, A. Borgia, E. Bos, T.J.V. Bowcock, C. Bozzi, T. Brambach, J. van den Brand, J. Bressieux, S. Brisbane, M. Britsch, T. Britton, N.H. Brook, H. Brown, A. Büchler-Germann, A. Bursche, J. Buytaert, S. Cadeddu, J.M. Caicedo Carvajal, O. Callot, M. Calvi, M. Calvo Gomez, A. Camboni, P. Campana, A. Carbone, G. Carboni, R. Cardinale, A. Cardini, L. Carson, K. Carvalho Akiba, G. Casse, M. Cattaneo, M. Charles, Ph. Charpentier, N. Chiapolini, X.Cid Vidal, P.J. Clark, P.E.L. Clarke, M. Clemencic, H.V. Cliff, J. Closier, C. Coca, V. Coco, J. Cogan, P. Collins, F. Constantin, G. Conti, A. Contu, M. Coombes, G. Corti, G.A. Cowan, R. Currie, B. DʼAlmagne, C. DʼAmbrosio, W. Da Silva, P. David, I. De Bonis, S. De Capua, M. De Cian, F. De Lorenzi, J.M. De Miranda, L. De Paula, P. De Simone, D. Decamp, H. Degaudenzi, M. Deissenroth, L. Del Buono, C. Deplano, O. Deschamps, F. Dettori, J. Dickens, H. Dijkstra, M. Dima, P. Diniz Batista, S. Donleavy, P. Dornan, D. Dossett, A. Dovbnya, F. Dupertuis, R. Dzhelyadin, C. Eames, S. Easo, U. Egede, V. Egorychev, S. Eidelman, D. van Eijk, F. Eisele, S. Eisenhardt, L. Eklund, Ch. Elsasser, D.G. dʼEnterria, D. Esperante Pereira, L. Estève, A. Falabella, E. Fanchini, C. Färber, G. Fardell, C. Farinelli, S. Farry, V. Fave, V. Fernandez Albor, M. Ferro-Luzzi, S. Filippov, C. Fitzpatrick, F. Fontanelli, R. Forty, M. Frank, C. Frei, M. Frosini, S. Furcas, A. Gallas Torreira, D. Galli, M. Gandelman, P. Gandini, Y. Gao, J.-C. Garnier, J. Garofoli, L. Garrido, C. Gaspar, N. Gauvin, M. Gersabeck, T. Gershon, Ph. Ghez, V. Gibson, V.V. Gligorov, C. Göbel, D. Golubkov, A. Golutvin, A. Gomes, H. Gordon, C. Gotti, M. Grabalosa Gándara, R. Graciani Diaz, L.A. Granado Cardoso, E. Graugés, G. Graziani, A. Grecu, S. Gregson, B. Gui, E. Gushchin, Yu. Guz, T. Gys, G. Haefeli, S.C. Haines, T. Hampson, S. Hansmann-Menzemer, R. Harji, N. Harnew, P.F. Harrison, J. He, K. Hennessy, P. Henrard, J.A. Hernando Morata, E. van Herwijnen, A. Hicheur, E. Hicks, W. Hofmann, K. Holubyev, P. Hopchev, W. Hulsbergen, P. Hunt, T. Huse, R.S. Huston, D. Hutchcroft, V. Iakovenko, P. Ilten, J. Imong, R. Jacobsson, M. Jahjah Hussein, E. Jans, F. Jansen, P. Jaton, B. Jean-Marie, F. Jing, M. John, D. Johnson, C.R. Jones, B. Jost, F. Kapusta, T.M. Karbach, J. Keaveney, U. Kerzel, T. Ketel, A. Keune, B. Khanji, Y.M. Kim, M. Knecht, S. Koblitz, A. Konoplyannikov, P. Koppenburg, A. Kozlinskiy, L. Kravchuk, G. Krocker, P. Krokovny, F. Kruse, K. Kruzelecki, M. Kucharczyk, S. Kukulak, R. Kumar, T. Kvaratskheliya, V.N. La Thi, D. Lacarrere, G. Lafferty, A. Lai, R.W. Lambert, G. Lanfranchi, C. Langenbruch, T. Latham, R. Le Gac, J. van Leerdam, J.-P. Lees, R. Lefèvre, A. Leflat, J. Lefrançois, O. Leroy, T. Lesiak, L. Li, Y.Y. Li, L.Li Gioi, M. Lieng, M. Liles, R. Lindner, C. Linn, B. Liu, G. Liu, J.H. Lopes, E. Lopez Asamar, N. Lopez-March, J. Luisier, B. Mʼcharek, F. Machefert, I.V. Machikhiliyan, F. Maciuc, O. Maev, J. Magnin, A. Maier, S. Malde, R.M.D. Mamunur, G. Manca, G. Mancinelli, N. Mangiafave, U. Marconi, R. Märki, J. Marks, G. Martellotti, A. Martens, L. Martin, A. Martín Sánchez, D. Martinez Santos, A. Massafferri, Z. Mathe, C. Matteuzzi, M. Matveev, V. Matveev, E. Maurice, B. Maynard, A. Mazurov, G. McGregor, R. McNulty, C. Mclean, M. Meissner, M. Merk, J. Merkel, M. Merkin, R. Messi, S. Miglioranzi, D.A. Milanes, M.-N. Minard, S. Monteil, D. Moran, P. Morawski, J.V. Morris, R. Mountain, I. Mous, F. Muheim, K. Müller, R. Muresan, F. Murtas, B. Muryn, M. Musy, J. Mylroie-Smith, P. Naik, T. Nakada, R. Nandakumar, J. Nardulli, M. Nedos, M. Needham, N. Neufeld, M. Nicol, S. Nies, V. Niess, N. Nikitin, A. Oblakowska-Mucha, V. Obraztsov, S. Oggero, O. Okhrimenko, R. Oldeman, M. Orlandea, A. Ostankov, B. Pal, J. Palacios, M. Palutan, J. Panman, A. Papanestis, M. Pappagallo, C. Parkes, C.J. Parkinson, G. Passaleva, G.D. Patel, M. Patel, S.K. Paterson, G.N. Patrick, C. Patrignani, C. Pavel-Nicorescu, A. Pazos Alvarez, A. Pellegrino, G. Penso, M. Pepe Altarelli, S. Perazzini, D.L. Perego, E. Perez Trigo, A. Pérez-Calero Yzquierdo, P. Perret, A. Petrella, A. Petrolini, B. Pie Valls, B. Pietrzyk, D. Pinci, R. Plackett, S. Playfer, M. Plo Casasus, G. Polok, A. Poluektov, E. Polycarpo, D. Popov, B. Popovici, C. Potterat, A. Powell, T. du Pree, V. Pugatch, A. Puig Navarro, W. Qian, J.H. Rademacker, B. Rakotomiaramanana, I. Raniuk, G. Raven, S. Redford, W. Reece, A.C. dos Reis, S. Ricciardi, K. Rinnert, D.A. Roa Romero, P. Robbe, E. Rodrigues, F. Rodrigues, C. Rodriguez Cobo, P. Rodriguez Perez, G.J. Rogers, V. Romanovsky, J. Rouvinet, T. Ruf, H. Ruiz, G. Sabatino, J.J. Saborido Silva, N. Sagidova, P. Sail, B. Saitta, C. Salzmann, A. Sambade Varela, M. Sannino, R. Santacesaria, R. Santinelli, E. Santovetti, M. Sapunov, A. Sarti, C. Satriano, A. Satta, M. Savrie, D. Savrina, P. Schaack, M. Schiller, S. Schleich, M. Schmelling, B. Schmidt, O. Schneider, A. Schopper, M.-H. Schune, R. Schwemmer, A. Sciubba, M. Seco, A. Semennikov, K. Senderowska, N. Serra, J. Serrano, B. Shao, M. Shapkin, I. Shapoval, P. Shatalov, Y. Shcheglov, T. Shears, L. Shekhtman, O. Shevchenko, V. Shevchenko, A. Shires, E. Simioni, H.P. Skottowe, T. Skwarnicki, A.C. Smith, K. Sobczak, F.J.P. Soler, A. Solomin, P. Somogy, F. Soomro, B. Souza De Paula, B. Spaan, A. Sparkes, E. Spiridenkov, P. Spradlin, F. Stagni, O. Steinkamp, O. Stenyakin, S. Stoica, S. Stone, B. Storaci, U. Straumann, N. Styles, M. Szczekowski, P. Szczypka, T. Szumlak, S. TʼJampens, V. Talanov, E. Teodorescu, F. Teubert, C. Thomas, E. Thomas, J. van Tilburg, V. Tisserand, M. Tobin, S. Topp-Joergensen, M.T. Tran, A. Tsaregorodtsev, N. Tuning, A. Ukleja, P. Urquijo, U. Uwer, V. Vagnoni, G. Valenti, R. Vazquez Gomez, P. Vazquez Regueiro, S. Vecchi, J.J. Velthuis, M. Veltri, K. Vervink, B. Viaud, I. Videau, X. Vilasis-Cardona, J. Visniakov, A. Vollhardt, D. Voong, A. Vorobyev, An. Vorobyev, H. Voss, K. Wacker, S. Wandernoth, J. Wang, D.R. Ward, A.D. Webber, M. Whitehead, D. Wiedner, L. Wiggers, G. Wilkinson, M.P. Williams, M. Williams, F.F. Wilson, J. Wishahi, M. Witek, W. Witzeling, S.A. Wotton, K. Wyllie, Y. Xie, F. Xing, Z. Yang, G. Ybeles Smit, R. Young, O. Yushchenko, M. Zavertyaev, L. Zhang, W.C. Zhang, Y. Zhang, A. Zhelezov, L. Zhong, and E. Zverev
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, 0103 physical sciences, 010306 general physics, 01 natural sciences
Published: 2011
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7. The application of power system stabilizers to a multigenerator plant

Author: G.J. Rogers
Subjects: Electric power system, Engineering, Power station, Control theory, business.industry, Exciter, Energy Engineering and Power Technology, Power factor, Electrical and Electronic Engineering, Phase lead, business, Stabilizer (chemistry)
Abstract: The effect of power system stabilizers on the oscillatory modes of a generating plant, which consists of a number of equal, identical generators, is discussed. It is shown that the power system stabilizer design and the type of power system stabilizer input may alter the damping produced by the stabilizer on the exciter mode and the intra-plant electromechanical modes. A power system stabilizer which is designed to match the ideal phase lead over a wide frequency range is shown to add damping to plant, inter-area and intra-plant electromechanical modes. The exciter mode damping is shown to be reduced by power system stabilizers having frequency input.
Published: 2000
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8. Modeling of generators and their controls in power system simulations using singular perturbations

Author: G.J. Rogers, Jin Jiang, P. Kundur, X. Xu, and R.M. Mathur
Subjects: Singular perturbation, Engineering, business.industry, Energy Engineering and Power Technology, Electric generator, law.invention, Electric power system, Power system simulation, Electricity generation, law, Control theory, Electrical network, Power electronics, Electrical and Electronic Engineering, business, Machine control
Abstract: This paper presents an application of the singular perturbation method to power system simulations. The focus is on treatment of the fast states associated with generators and their controls. Models of generators, static exciters, power system stabilizers (PSS) and governors are reformulated using singular perturbation techniques. These singularly perturbed models are implemented in a two-area, four-machine power system. The results bear a close correlation to those obtained from a full model in which the fast states are fully simulated. This study contributes a new and efficient method in dealing with the fast states to speed up power system simulations.
Published: 1998
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9. Modeling effects of system frequency variation in long-term stability studies

Author: G.J. Rogers, Rajiv K. Varma, P. Kundur, and R.M. Mathur
Subjects: Fundamental study, Singular perturbation, Engineering, business.industry, Reactance, Energy Engineering and Power Technology, Two time scale, law.invention, Electric power system, Control theory, law, Electrical network, Electrical and Electronic Engineering, business, Electrical impedance, Analysis method
Abstract: This paper describes a fundamental study into modeling the effects of frequency variation on network and shunt impedances in long term power system stability simulations. The focus is on extreme post-fault situations where significant generation-load mismatch causes wide excursions in power system frequency. A novel application of singular perturbations is presented. This method is compared with the "constant reactance" technique, the "variable reactance" method in which the network reactances are varied with system frequency, and a method in which the network transients are fully simulated. Stability simulations for an interconnected two-area power system employing the different modeling techniques show that a two time scale analysis using the singular perturbation method is a feasible technique for accurate prediction of long term post fault system behaviour.
Published: 1996
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10. Performance of station service induction motors following full load rejection of a nuclear generating unit

Author: L.M. Hajagos, R.E. Beaulieu, and G.J. Rogers
Subjects: Electric motor, Engineering, business.industry, Protective relay, Energy Engineering and Power Technology, Control engineering, Voltage regulator, Nuclear reactor, law.invention, Reliability engineering, law, medicine, Transient (oscillation), Electrical and Electronic Engineering, medicine.symptom, business, Load rejection, Induction motor, Voltage
Abstract: In this paper we describe simulations, using EPRI's Extended Transient Midterm Stability Program (ETMSP), which were performed to understand the nature of a failed load rejection test on a nuclear unit. The failure was a result of large induction motors stalling, causing protective relays to operate. Potential remedial measures were simulated and a final solution, using a temporary voltage boost on the AVR, adopted and implemented to prevent further failures. >
Published: 1995
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11. H/sub /spl infin damping controller design in large power systems

Author: N.J. Balu, G.J. Rogers, M. Klein, L.X. Le, and S. Farrokhpay
Subjects: Controller design, Engineering, Series (mathematics), business.industry, Energy Engineering and Power Technology, Thyristor, Control engineering, System model, Electric power system, Control theory, Control system, Electrical and Electronic Engineering, business, Power control
Abstract: The design of an H/sub /spl infin controller for a thyristor controlled series VAr compensator to enhance the damping of an inter-area oscillations in a large power system is presented. The paper describes a comprehensive and systematic method of applying the H/sub /spl infin control design algorithm in power systems. Two methods to obtain a satisfactory reduced order system model, which is crucial to the success of the design, are described. >
Published: 1995
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12. Demystifying induction motor behavior

Author: G.J. Rogers
Subjects: Electric motor, Inspec, Engineering drawing, Visual Basic, SIMPLE (military communications protocol), business.industry, Computer science, Computer Science Applications, Computational Theory and Mathematics, Embedded system, Microsoft Windows, Equivalent circuit, Electrical and Electronic Engineering, business, computer, Induction motor, Graphical user interface, computer.programming_language
Abstract: Induction motors are very simple devices, but, ever since they were introduced by Tesla, they have mystified many practicing engineers. The INSPEC interactive program that runs in Microsoft Windows on 386 or higher PCs, is designed to calculate accurate equivalent circuit models from induction motor standard specifications. It has a full graphical user interface (GUI), created using Microsoft's Visual Basic. The use of the program to examine starting and bus transfer characteristics is discussed. >
Published: 1994
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13. Slow coherency based network partitioning including load buses

Author: S.B. Yusof, R.T.H. Alden, and G.J. Rogers
Subjects: Engineering, business.industry, Stability (learning theory), Energy Engineering and Power Technology, law.invention, Reduction (complexity), Identification (information), Electric power system, Matrix (mathematics), Control theory, law, Electrical network, Electrical and Electronic Engineering, business, Algorithm, Eigenvalues and eigenvectors, Network analysis
Abstract: The authors present a slow-coherency based network partitioning technique which groups generators and load buses simultaneously into several coherent areas. The technique uses the slow eigenbasis matrix which is extended to include load buses. A simple method of calculating the closeness of each row eigenvector to the reference row eigenvectors is used for grouping the load buses with the respective reference machine. The grouping information is useful for system reduction and identification of weak links for calculations involving network decouplings. The grouping method is illustrated using test systems and large practical systems. >
Published: 1993
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14. Analytical investigation of factors influencing power system stabilizers performance

Author: G.J. Rogers, M. Klein, S. Moorty, and P. Kundur
Subjects: Electric power system, Engineering, Reliability (semiconductor), Control theory, business.industry, Normal mode, Energy Engineering and Power Technology, Voltage regulator, Electrical and Electronic Engineering, business, Stability (probability), Voltage
Abstract: Results of simulations, designed to illustrate the influence of power system stabilizers (PSS) on inter-area and local oscillations in interconnected power systems, are reported. It is shown that the PSS location and the voltage characteristics of the system loads are significant factors in the ability of a PSS to increase the damping of interarea oscillations. It is also shown that an interaction between modes in two distinct parts of a power system is possible, due to resonance, and that this might cause distortions in mode shape and participation factors. >
Published: 1992
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15. The effect of gamma irradiation on a xenograft tendon bioprosthesis

Author: G.J. Rogers, K. True, S.C. Roe, Bruce Milthorpe, and Klaus Schindhelm
Subjects: Male, Tail, Protein Denaturation, Hot Temperature, Materials science, Biophysics, Prosthesis Design, Tendons, chemistry.chemical_compound, Tensile Strength, Materials Testing, Ultimate tensile strength, medicine, Animals, Irradiation, Bioprosthesis, Macropodidae, Sheep, Sterilization, Biomaterial, Tendon, Cross-Linking Reagents, medicine.anatomical_structure, chemistry, Gamma Rays, Glutaral, Collagenase, Fresh frozen, Collagen, Glutaraldehyde, Gamma irradiation, Biomedical engineering, medicine.drug
Abstract: Radiation sterilisation of xenograft prostheses has been shown to cause damage to the material. Such damage has been imputed to affect the mechanical and biological properties and may contribute to long-term failure. This study has examined the effect of 25 kGy (2·5 Mrad) of gamma radiation on the mechanical and physicochemical properties and the biological function of a xenograft tendon bioprosthesis derived from glutaraldehyde cross-linked kangaroo tail tendon. The ultimate tensile stress of nonirradiated glutaraldehyde cross-linked tendon was greater than that of fresh frozen tendon, but irradiated cross-linked tendon did not differ. Irradiation did not alter the response to prolonged collagenase exposure. There was a decrease in overall apparent cross-link density (as determined by thermal denaturation temperature). After 12 months implantation, there was a slightly more active cellular response around irradiated tendon and the very peripheral fibres were infiltrated, but the mechanical properties of the retrieved implants were the same for irradiated and nonirradiated material. Gamma irradiation would appear to be a satisfactory method of sterilisation for glutaraldehyde cross-linked tendon materials. However, as damage to the cross-linked structure was detected in this study, it may not be appropriate in other applications.
Published: 1992
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16. Small signal stability program analysis of SVC and HVDC in AC power systems

Author: P. Kundur, D.Y. Wong, M.G. Lauby, G.J. Rogers, and S. Arabi
Subjects: Frequency response, Engineering, Signal processing, business.industry, Energy Engineering and Power Technology, Voltage regulator, AC power, Stability (probability), law.invention, Transmission (telecommunications), Control theory, law, Control system, Electrical network, Electronic engineering, Electrical and Electronic Engineering, business
Abstract: High-voltage DC transmission links and static VAr (voltampere reactive) compensators (SVCs) have controllable characteristics with potential for affecting system stability. To study these effects and to design their controllers for improving system stability, there is a need for their representation in small-signal stability programs as well as time simulation programs. The formulation of DC link and SVC models and their controllers for small-signal stability are addressed. Several examples are studied to show the capability and application of the small-signal DC link and SVC models. The small-signal results are verified by time-domain simulation results of the same study cases. Modes obtained by spectral analysis of the time simulation results are very close to those obtained by small-signal stability analysis. >
Published: 1991
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17. A fundamental study of inter-area oscillations in power systems

Author: G.J. Rogers, P. Kundur, and M. Klein
Subjects: Engineering, business.industry, Energy Engineering and Power Technology, Electric generator, Signal, law.invention, Generator (circuit theory), Electric power system, law, Control theory, Electrical network, Transient (oscillation), Electrical and Electronic Engineering, business, Excitation, Network analysis
Abstract: A fundamental study of the nature of inter-area oscillations in power systems is presented. The effects of the system structure, generator modeling, excitation type, and system loads are discussed in detail. Both small signal and transient stability analyses are used to determine the characteristics of the system. >
Published: 1991
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18. A comprehensive computer program package for small signal stability analysis of power systems

Author: G.J. Rogers, D.Y. Wong, P. Kundur, M.G. Lauby, and L. Wang
Subjects: Electric power system, Range (mathematics), Consistency (database systems), Computer science, Modal analysis, Control system, Convergence (routing), Stability (learning theory), Electronic engineering, Energy Engineering and Power Technology, Control engineering, Electrical and Electronic Engineering, Power control
Abstract: A package of integrated programs for small-signal stability analysis of large interconnected power systems is described. The package has extensive modeling capability and uses alternative eigenvalue calculation techniques, making it suitable for the analysis of a wide range of stability and control problems. Results of eigenvalue calculations for three power systems of differing size and complexity are presented and the accuracy, consistency and convergence of the alternative calculation methods are discussed. >
Published: 1990
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19. Intelligent control of facts for damping power system low frequency oscillations

Author: Carlos A. Lozano, Laiq Khan, and G.J. Rogers
Subjects: Electric power system, Engineering, Control theory, business.industry, Control system, Electronic engineering, Maximum power transfer theorem, Static VAR compensator, Fuzzy control system, Transmission system, AC power, Intelligent control, business
Abstract: This paper describes fuzzy control theory to modulate the input signal for static Var compensator (SVC) to enhance power system stability. Static Var compensator, which is the first generation of FACTS devices, increases power transfer and improves the damping of electromechanical oscillations when used in transmission systems. The proposed control system for SVC is based on fuzzy set theory. The quantity of reactive power supplied and/or absorbed by SVC is determined based on the input signals at each sampling time. The effectiveness of the proposed control scheme is demonstrated by a single machine infinite bus system (SMIB) through computer simulations.
Published: 2005
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20. Dynamic model verification using a continuous modal parameter estimator

Author: K. Hay, G.J. Rogers, and D.H. Wilson
Subjects: Electric power system, Modal, Control theory, Normal mode, Computer science, Consistency (statistics), Estimation theory, Mode (statistics), Estimator, Observability
Abstract: The use of a continuous modal parameter estimation technique is demonstrated for the purpose of verifying a dynamic system model. By using simulated signals containing small-signal oscillations in place of real power system measurements, the consistency of the estimations with underlying system parameters are shown. It is noted that the choice of measurement location is important for reasons of mode observability. The use of mode shape estimation is also demonstrated, and the estimated mode shape is shown to be consistent with the model expectation. It is concluded that the modal parameter estimator performs well for modes of practical significance, and is suitable for verifying dynamic system models.
Published: 2004
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21. Communication aspect of parallel distributed algorithms on a cluster of workstations using the RPC

Author: R.T.H. Alden, G.J. Rogers, Barna Szabados, and S.B. Yusof
Subjects: DCE/RPC, Workstation, Computer science, Distributed algorithm, law, Remote procedure call, Distributed computing, Parallel algorithm, Concurrent computing, Parallel computing, Cluster analysis, Scheduling (computing), law.invention
Abstract: In this paper, communication aspects of Remote Procedure Calls (RPC) technique for parallel, distributed computation are discussed. To investigate these aspects, algorithm for backward/forward solution of linear systems that are normally encountered in power systems analysis is implemented on a cluster of workstations. Three scheduling techniques are discussed and their effects on communications and execution speed are analyzed. >
Published: 2002
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22. The NSF foundation coalition-past, present, and future

Author: Karan Watson, K. Frair, Jeffrey E. Froyd, and G.J. Rogers
Subjects: Engineering, business.industry, media_common.quotation_subject, Lifelong learning, Knowledge engineering, Educational technology, Appropriate technology, State (polity), Engineering education, General partnership, ComputingMilieux_COMPUTERSANDEDUCATION, Engineering ethics, business, Curriculum, media_common
Abstract: The Foundation Coalition (FC) was funded in 1993 as the fifth coalition in the National Science Foundation's Engineering Education Coalitions Program. The FC has as its vision a new culture of engineering education: students and faculty working in partnership to create an enduring foundation for student development and life-long learning. The member institutions-Arizona State University (ASU), Maricopa Community College District (MCCD), Rose-Hulman Institute of Technology (RHTT), Texas AM to attract and retain a more demographically diverse student body, and to graduate a new generation of engineers who can more effectively solve the increasingly complex, rapidly changing societal problems.
Published: 2002
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23. Evolution and evaluation of an integrated, first-year curriculum

Author: G.J. Rogers and Jeffrey E. Froyd
Subjects: Cooperative learning, Emergent curriculum, Engineering, Medical education, Academic year, business.industry, Formative assessment, Summative assessment, Engineering education, Pedagogy, Curriculum mapping, ComputingMilieux_COMPUTERSANDEDUCATION, business, Curriculum
Abstract: Rose-Hulman Institute of Technology, USA, is planning to offer a new first-year program for all entering students in the 1998-99 academic year. The new first-year program will build on seven years of experience with the Integrated, First-Year Curriculum in Science, Engineering, and Mathematics (IFYCSEM). In IFYCSEM, faculty integrate topics in calculus, physics, chemistry, computer science, engineering design, engineering statics and engineering graphics into a year-long curriculum which emphasizes links among topics, problem solving and teams. These faculty have pioneered innovations in the areas of curriculum integration, technology-enabled education, cooperative learning and continuous improvement through assessment and evaluation. Rose-Hulman's experience has helped encourage other institutions to offer prototype first-year curricula modeled upon IFYCSEM. These institutions include Rose-Hulman's partners in the Foundation Coalition: Arizona State University, Maricopa Community College District, Texas A&M University, Texas A&M University at Kingsville, Texas Woman's University and the University of Alabama. The paper summarizes the goals of the curriculum, the structure of the curriculum, significant innovations, student perceptions of the curriculum, summative assessment data, evolution of the program through formative assessment and continuous improvement, impact of IFYCSEM beyond Rose-Hulman and the development of an Institute-wide first-year program.
Published: 2002
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24. Modeling effects of system frequency variations in induction motor dynamics using singular perturbations

Author: R.M. Mathur, X. Xu, G.J. Rogers, Jin Jiang, and P. Kundur
Subjects: Engineering, Singular perturbation, business.industry, Stator, Energy Engineering and Power Technology, Slip (materials science), Reduced order, law.invention, Electric power system, Power system simulation, Control theory, law, Electrical and Electronic Engineering, business, Induction motor, Voltage
Abstract: Summary form only given as follows. This paper presents an application of singular perturbation theory to modeling induction motors in system simulations. The focus is on model approximations and their impact on a motor's response to changes in system frequency as well as voltage. The fast states associated with the motor stator and rotor dynamics are eliminated from a full motor model using singular perturbations with a first order correction factor added. This leads to a reduced order motor model referred to as the singularly perturbed model. The starting performance of this model is compared to that of a full model, and to that of a simple model in which the fast states are modeled by neglecting the rates of change of the fast variables. The response of the singularly perturbed model is much closer to that of the full model than is that of the model which neglects the rates of change of the fast variables completely. It is also noted that a corrected first-order slip model of the induction motor can yield a more accurate speed response than a conventional uncorrected first-order slip model during frequency and voltage changes. The response of models are also compared to disturbances applied to a two-area four-machine power system and again the singularly perturbed model performance is closer to that of the full model than is the model with the rates of change of the fast states neglected completely. While the simulation time using the singularly perturbed model is longer than that using the simple model, it is considerably less than that of the full model.
Published: 2002
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25. Fuzzy classification based identification of voltage sag via wavelets

Author: G.J. Rogers, R.N. Mukerjee, S. Soyat, and B. Tanggawelu
Subjects: Electric power distribution, Fuzzy classification, business.industry, Computer science, Voltage optimisation, Fuzzy logic, Electric power system, Wavelet, Hardware_GENERAL, Control theory, Voltage sag, Power quality, business, Voltage
Abstract: Increasing awareness of power quality issues, deregulation, use of consumer devices sensitive to power system disturbance and possibility of making up some of the inherent design limitations through monitoring based operational strategies have created a need for extensive monitoring of the power system operation. Voltage disturbance is a common phenomenon in electric power distribution system operation. A fuzzy diagnostic procedure is proposed for detecting cause of voltage disturbance, so that appropriate remedial procedures could be initiated during system operation. The method uses indices like PN factor, characteristic voltage, and zero sequence voltage and also proposes an index termed frequency jump index, extracted from zero sequence voltage using wavelets.
Published: 2002
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26. Nitrous acid pretreatment of tendon xenografts cross-linked with glutaraldehyde and sterilized with gamma irradiation

Author: G.J. Rogers, Bruce Milthorpe, C. R. Howlett, Kenneth A. Johnson, Klaus Schindhelm, M.K. Clayton, and S.C. Roe
Subjects: Male, Materials science, Time Factors, Biocompatibility, medicine.drug_class, Transplantation, Heterologous, Biophysics, Nitrous Oxide, Bioengineering, Biocompatible Materials, Transplantation, Autologous, Biomaterials, Andrology, Tendons, chemistry.chemical_compound, Antiseptic, Materials Testing, medicine, Animals, Macropodidae, Nitrous acid, Lagomorpha, Sheep, biology, Sterilization, biology.organism_classification, medicine.disease, Tendon, Cellular infiltration, medicine.anatomical_structure, Cross-Linking Reagents, chemistry, Mechanics of Materials, Gamma Rays, Glutaral, Ceramics and Composites, Glutaraldehyde, Collagen, Rabbits, Swelling, medicine.symptom, Biomedical engineering
Abstract: Collagenous xenografts made from kangaroo tail tendon cross-linked with glutaraldehyde have a potential application in the reconstruction of massive digital tendon deficits. However, a limitation to the clinical use of these xenografts has been the optimization of collagen cross-linking, and subsequent bio-incorporation and retention of mechanical properties following implantation. The purpose of this study was to evaluate the effect of nitrous acid on modulating the biologic and mechanical properties of tendon xenografts cross-linked with glutaraldehyde. Tendon xenografts were pretreated with 0.1 or 0.01 M nitrous acid solution, prior to cross-linking in 2% glutaraldehyde and sterilization by gamma irradiation. Xenografts were implanted intramuscularly in rabbits to examine biocompatability, and also used to repair ovine digital extensor tendon deficits to evaluate functional incorporation. Histologically, intramuscularly implanted nitrous acid pretreated xenografts in rabbits had a greater degree of diffuse cellular infiltration into interstitial splits in the graft than controls after 12 weeks. Xenografts implanted in an ovine extensor tendon deficit were evaluated after 26 and 52 weeks. Rate of failure of tenorrhaphies between host tendon and xenografts overall (15/21) was significantly greater (P0.05) than for autografts (1/21), suggesting that the holding power of sutures in xenografts was inferior to that obtained in autografts. Tensile failure stress of midsections of both nitrous acid pretreated and control xenografts was about 100 MPa prior to implantation (time zero). After 26 and 52 weeks, failure stress of both types of xenografts was significantly less than at time zero (P0.05). At 52 weeks, failure stress of nitrous acid pretreated xenografts (47.4 +/- 3.1 MPa) was significantly less than control xenografts (63.7 +/- 5.4 MPa); (P0.05). However, nitrous acid pretreated xenografts were similar to control xenografts in failure load (357 +/- 29 and 354 +/- 26 N, respectively), but they tended to have larger cross-sectional areas (7.6 +/- 0.5 versus 5.7 +/- 0.6 mm2, respectively) which were responsible for the lower calculated value for failure stress. Histologically, autografts maintained their normal tissue architecture and evoked a more limited cellular response in surrounding tissues than xenografts (P0.05). Both types of xenograft were surrounded by a thicker cuff of cellular response than autografts. However, compared to control xenografts, nitrous acid pretreated xenografts had more extensive fragmentation and splitting of collagen bundles, and more diffuse cellular and vascular infiltration into these interstitial splits, and these alterations were apparently contributing to the greater 'swelling' of these xenografts. It was concluded that pretreatment of tendon xenografts with nitrous acid modulated their biologic and material properties. Further studies are needed to elucidate the mechanism of these effects, and to determine if the protocol for tendon xenograft preparation could be optimized for improved clinical performance.
Published: 1999

27. Retaining states of the original system in reduced order model

Author: G.J. Rogers, A.H. Chaudhfy, and Bruce A. Francis
Subjects: Reduction (complexity), Engineering, Electric power system, State variable, Control theory, business.industry, Order (business), Small number, State (computer science), business, Generator (mathematics)
Abstract: In order to get a controller with a small number of states, it is usually necessary to reduce the model of the plant. It is particularly important in decentralized power system control design because of the large number of nearly unstabilizable/undetectable modes from a specified control substation. A drawback of most model reduction techniques is that the state of the reduced order model has no physical significance. This paper presents a stepwise procedure for retaining certain specified state variables of the system in a reduced order model, thus allowing more detailed analysis, e.g., in simulation, of a particular part of the system using the reduced order model. The procedure can be used in conjunction with any model reduction technique. An example of the model reduction of a generator for the purpose of power system stabilizer design is presented to illustrate the procedure.
Published: 1999
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28. Shielding of augmented tendon--tendon repair

Author: C. R. Howlett, G.J. Rogers, S.C. Roe, Bruce Milthorpe, and Klaus Schindhelm
Subjects: Bovine pericardium, Movement, Polyesters, Transplantation, Heterologous, Biomedical Engineering, Biophysics, Adhesion (medicine), Bioengineering, Biocompatible Materials, Transplantation, Autologous, Biomaterials, Tendons, Suture (anatomy), Tensile Strength, medicine, Animals, Extensor tendons, Sheep, Chemistry, Adhesion barrier, Prostheses and Implants, musculoskeletal system, medicine.disease, Tendon, medicine.anatomical_structure, Mechanics of Materials, Electromagnetic shielding, Ceramics and Composites, Cattle, Stress, Mechanical, Range of motion, Biomedical engineering
Abstract: Strength and function of autogenic and xenogenic reconstruction of digital extensor tendons was examined in an ovine model. In this study, tendon-graft junctions were formed by either suture augmented with a woven polyester tube (A), or augmented and shielded from surrounding tissues by chemically-treated bovine pericardium (S). By 12 wk, both A and S sheep had returned to full range of motion. Mechanical strength of both the autograft-host and xenograft-host repair sites was similar, with a pooled strength of 131 ± 25 N (n = 15). Similarly, the mid-portion xenograft strengths were constant at approximately 366 ± 97 N (n = 7). In contrast, mid-portion autograft strengths decreased from 380 ± 110 N (N = 4) to 120 ± 66 N (n = 4) if shielding was omitted. The loss in autograft strength was attributed to loss of function associated with adhesions. The use of the augmentation device coupled with an adhesion barrier gives higher initial reconstruction strength and improved function during the host repair period up to 12 wk. © 1995.
Published: 1995

29. Treated xenografts as gliding tendon prostheses in an ovine model

Author: C.B. Hewlett, P.J. Hall, G.J. Rogers, B.K. Muttorpe, and Klaus Schindhelm
Subjects: Initial strength, medicine.medical_specialty, Biocompatibility, Transplantation, Heterologous, Biophysics, Biomedical Engineering, Bioengineering, Anastomosis, In Vitro Techniques, Biomaterials, Tendons, Fixatives, Tensile Strength, Ultimate tensile strength, Materials Testing, medicine, Animals, Macropodidae, Sheep, business.industry, Anastomosis, Surgical, Elasticity, Surgery, Tendon, Resorption, Biomechanical Phenomena, medicine.anatomical_structure, Mechanics of Materials, Orthopedic surgery, Ceramics and Composites, Implant, business, Biomedical engineering
Abstract: A model for testing the properties of gliding tendon grafts has been developed that allows anastomoses to be evaluated separately from the mid-portion of the graft. In addition, two different graft materials may be implanted in one sheep foreleg whilst maintaining control (not operated) tendons in both the operated leg and contralateral foreleg. The model has been used to evaluate the response of xenografts made from chemically treated kangaroo tail tendon (KTT) compared with autografts. At 3 month the mid-sections of the glutaraldehyde-fixed xenografts maintained between 57 and 82% of their initial ultimate tensile strength whereas lyophilized KTT dropped to 10% and autografts retained 91% of initial strength. Sterilization by γ-radiation of wet xenografts did not affect the material and implant properties significantly. Longer term studies are necessary to determine the resorption behaviour of the xenografts. Anastomosis strengths were found to be about the same for all grafts, at about 25% of the strength of the original tendon. Alternatives need to be investigated to improve this strength.
Published: 1991

30. Measurement of the mechanical properties of the ovine anterior cruciate ligament bone-ligament-bone complex: a basis for prosthetic evaluation

Author: A. Muratore, G.J. Rogers, Klaus Schindhelm, and Bruce Milthorpe
Subjects: medicine.medical_specialty, Materials science, Knee Joint, Anterior cruciate ligament, Biomedical Engineering, Biophysics, Bioengineering, In Vitro Techniques, Prosthetic evaluation, Biomaterials, Reference Values, Tensile Strength, Ultimate tensile strength, medicine, Prosthesis design, Animals, Sheep, musculoskeletal system, Surgery, Biomechanical Phenomena, medicine.anatomical_structure, Mechanics of Materials, Ligaments, Articular, Ceramics and Composites, Ligament, Stress, Mechanical, Knee Prosthesis, Biomedical engineering
Abstract: The reported ultimate tensile stress of the anterior cruciate ligament varies greatly, ranging from 13 to 147 MPa. This study shows that the orientation and degree of flexion of the bone-ligament-bone complex significantly alter the apparent ultimate tensile properties (ultimate tensile stress ranging from 60 ± 3 to 123 ± 15 MPa, ultimate specific extension from 37 ± 7 to 93 ± 20%), whilst the method chosen for measuring extension also affects the calculated specific extension of the bone-ligament-bone complex. It is suggested that, for considerations of prosthesis design and evaluation, the mechanical properties of the bone-ligament-bone complex should be measured in anterior draw and extension measured using points as close as possible to the positions of the ligamentous attachment sites.
Published: 1990

31. Autograft and Leeds-Keio Reconstructions of the Ovine Anterior Cruciate Ligament

Author: C. R. Howlett, Goldberg J, G.J. Rogers, Klaus Schindhelm, Bruce Milthorpe, Viglione W, P.J. Hall, and Sekel R
Subjects: medicine.medical_specialty, business.industry, medicine.medical_treatment, Anterior cruciate ligament, Stent, General Medicine, musculoskeletal system, Prosthesis, Tendon, Surgery, Gross examination, medicine.anatomical_structure, Orthopedic surgery, medicine, Orthopedics and Sports Medicine, Patella, business, Range of motion
Abstract: This study compared the Leeds-Keio prosthesis with grafting of autogeneic patellar tendon for the reconstruction of the ovine anterior cruciate ligament under controlled conditions. Reconstructed knees from six sheep of each group were evaluated at 12, 26, and 52 weeks postreconstruction with respect to clinical assessment, gross pathology, mechanical properties, and histology. Although no difference in clinical assessment (anteroposterior draw, range of motion, and function) was noted between the prosthesis reconstruction and the autograft reconstruction, the prosthesis provided a higher strength initially, which remained relatively constant over the one-year study. However, prosthesis wear was observed, with up to 50% of Dacron fibers ruptured in some cases. Histologic sections indicated that in the ovine model, the Leeds-Keio prosthesis should be considered an artificial device and not a scaffold or stent that supports aligned collagenous growth. The autograft had low strength at 12 weeks, which increased over the study period. Despite acceptable clinical performance and adequate mechanical properties up to one year postimplantation, neither reconstruction approached the clinical or mechanical performance of the normal anterior cruciate ligament in the ovine model.
Published: 1991
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32. Application of Induction Motor Simulation Models to Power Station Auxiliary Pump Drives

Author: J.R. Smith, G.J. Rogers, and G.W. Buckley
Subjects: Engineering, Power station, business.industry, Induction generator, General Engineering, Energy Engineering and Power Technology, law.invention, Mechanical system, Electricity generation, law, Control theory, Eddy current, Electrical and Electronic Engineering, business, Operating speed, Induction motor, Voltage
Abstract: Transient operation, such as that caused by faults or switching, often results in auxiliary drive motors departing significantly from their normal operating speed. Under these conditions it is necessary to take account of parameter changes caused by saturation and eddy current effects. The paper presents a mathematical model which utilises a modal technique to represent eddy currents and includes saturation effects. The model also included a representation of the mechanical system. A number of important operating conditions are simulated and comparisons of test and computed results are presented for a test machine.
Published: 1979
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33. A DYNAMIC INDUCTION MOTOR MODEL INCLUDING SPACE HARMONICS

Author: G.J. Rogers
Subjects: Engineering, business.industry, Rotor (electric), Squirrel-cage rotor, AC motor, Wound rotor motor, law.invention, Direct torque control, law, Control theory, Harmonics, Electrical and Electronic Engineering, business, Synchronous motor, Induction motor
Abstract: An induction motor model is presented which can be used to compute dynamic characteristics and which includes both asynchronous and synchronous parasitic torque effects owing to space harmonics. A new transformation is given which eases computation and enables the stability of the synchronous parasitic torque to be determined. The model is applied to the computation of the direct on line starting characteristic for a four pole, three phase cage machine with 36 stator slots and 28 rotor slots.
Published: 1979
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34. Recursive Identification for System Models of Transfer Function Type

Author: G.J. Rogers and P.J. Lawrence
Subjects: Nonlinear system, Frequency response, Control theory, Data reuse, Diagonal, Inversion (meteorology), Transfer function, Mathematics
Abstract: arbitrary non-linear in parameters models. With the restriction of diagonal noise convariance the necessity for matrix inversion is avoided. Guaranteed stability and simplicity enable the routine to be implemented on small computers in an interactive mode. Application to transfer function type modelling of both linear and non-linear systems is discussed. Data reuse and elimination is also shown to be possible in this application.
Published: 1979
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35. Effects of Governor Characteristics on Turbo-Generator Shaft Torsionals

Author: R.E. Beaulieu, G.J. Rogers, and D.C. Lee
Subjects: Engineering, Turbo generator, business.industry, General Engineering, Energy Engineering and Power Technology, Electric generator, Turbine, law.invention, Electric power system, law, Linearization, Control theory, Control system, Electrical and Electronic Engineering, Governor, business, Synchronous motor
Abstract: Some of the torsional modes of oscillation of turbine-generator multimass shaft systems can be destabilized through the control action of high speed electrohydraulic turbine governing systems. This form of destabilization surfaced during the commissioning of one of Ontario Hydro's 665 MVA nuclear units. The causes of the problem were identified by measurements taken during the commissioning process and a detailed study of the control system. Conclusions reached as to the causes were supported by computer modelling. More accurate valve linearization circuits and filtering of shaft torsional components in the governor speed signal resolved the problem. A recommendation is made for direct monitoring of shaft torsional components, at least during the commissioning process.
Published: 1985
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36. Control for stability in interconnected power systems

Author: G.J. Rogers
Subjects: Engineering, business.industry, Control engineering, Power optimization, Modeling and simulation, Electric power system, Power system simulation, Control and Systems Engineering, Robustness (computer science), Modeling and Simulation, Power-flow study, Electrical and Electronic Engineering, business, Power control
Abstract: The development of a number of stabilizing controls is described. The robustness of the overall power system is emphasized along with modifications to the basic controls necessary to achieve this robustness. Analytical tools used in the design of practical power system controls are described. The importance of validation of modeling and simulation methods by planned system tests and by the analysis of naturally occurring faults is stressed. Likely future system developments are reviewed, including implications for the types of controls that may be necessary. >
Published: 1989
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37. Eigenvalue analysis of very large power systems

Author: D.Y. Wong, G.J. Rogers, P. Kundur, and B. Porretta
Subjects: business.industry, Energy Engineering and Power Technology, Modular design, Stability (probability), law.invention, Electric power system, law, Frequency domain, Electrical network, Electronic engineering, Electrical and Electronic Engineering, business, Eigenvalues and eigenvectors, Mathematics, Generator (mathematics), Matrix method
Abstract: A method of analyzing the small signal stability of very large power systems is described. The method is based on a frequency-domain approach which concentrates on the electromechanical modes of the power system under study. By using a modular modeling concept and an efficient sparsity network solution routine, systems having up to 12000 buses and 1000 detailed generator models can be studied. A comparison is made between eigenvalues calculated by this method and by other existing programs. >
Published: 1988
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38. Measurements of power transistor thermal instabilities, stable hot-spots, and second-breakdown

Author: G.J. Rogers, D.L. Blackburn, and S. Rubin
Subjects: Materials science, business.industry, Electrical engineering, Hardware_PERFORMANCEANDRELIABILITY, Mechanics, Electricity generation, Nondestructive testing, Power module, Thermal, Limit (music), Hardware_INTEGRATEDCIRCUITS, Breakdown voltage, Thermal stability, Power semiconductor device, business
Abstract: The relationships of thermal instability, stable hot spots, and second breakdown in power transistors are discussed. A rationale is also given for using thermal instability as opposed to second breakdown as the specified limit of safe operation for power transistors. It is shown that the limit of thermal instability can be accurately predicted and the simple device measurements required to do this are described. A rapid, easy, nondestructive test is also described for experimentally determining this limit.
Published: 1976
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39. Microcomputer-based system for tensile testing of biological materials

Author: G.J. Rogers, Bruce Milthorpe, and Klaus Schindhelm
Subjects: Macropodidae, Engineering, business.industry, Analyser, Full scale, Biomedical Engineering, Mechanical engineering, Biological tissue, Slip (materials science), Biological materials, Computer Science Applications, Tendons, Tensometer, Microcomputers, Microcomputer, Tensile Strength, Electronic engineering, Animals, business, Software, Tensile testing
Abstract: The tensile testing of biological materials poses specific problems. Biological tissue may slip in the grips of the tensometer during tensile testing, and this needs to be taken into account in the calculation of strain. The inherent variability of tissue samples requires that a large number of samples be analysed to adequately characterise a given biological structure. These problems have been addressed by integrating a digital video dimensional analyser and a microcomputer into a system that can be attached to most tensometers. Features of the system are: automated data acquisition, analysis and filing; resolution of load and extension to better than 0·1 per cent of full scale; and achievable high throughput. © 1988 IFMBE.
Published: 1988

40. Existing reactor containment program

Author: G.J. Rogers and M.W. Meacock
Subjects: Statement of work, Engineering, Work (electrical), Waste management, Containment, business.industry, business, Construction engineering
Abstract: A request was made for preliminary data on those engineering and study items to be included in the scope of work covered by Project CG-79L, Confinement of Radioactive Particulate Matter in 105 Building Exhaust Air''. Time has not been available, of course, to accomplish any significant amount of additional engineering work. However, an effort was made to assemble all the information which is currently at hand regarding these items. The results are presented.
Published: 1958
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41. AIR LEAKAGE RATE STUDIES ON THE C.S.E. CONTAINMENT VESSEL

Author: G.J. Rogers and M.E. Witherspoon
Subjects: Containment, Forensic engineering
Published: 1969
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42. Suboptimal regulator-design method for improved system stability

Author: D.C. Stringfellow, J.R. Smith, and G.J. Rogers
Subjects: Engineering, business.industry, Design specification, Voltage control, Numerical technique, General Engineering, Regulator, System stability, General Medicine, Control theory, Sensitivity (control systems), business, Synchronous motor, Eigenvalues and eigenvectors
Abstract: A regulator-design algorithm is described in which a systematic numerical technique is used to predetermine the performance criterion J = ∫0∞ (xtQx+u2)dt. The constraints imposed on the system response by the design specification are associated with the movement of the eigenvalue locations to give actual values for the elements of Q. The algorithm described here, for the linear single-input system, is based on the sensitivity of the elements of Q to shifts in the eigenvalue locations to produce a performance criterion for improved system stability. A practical example of the method, applied to the voltage control of a synchronous machine, is included.
Published: 1977
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43. Sequential transfer-function synthesis from measured data

Author: G.J. Rogers and P.J. Lawrence
Subjects: Mathematical optimization, Frequency response, Computer science, Linear system, General Engineering, Online identification, Inversion (meteorology), General Medicine, Transfer function, Algorithm
Abstract: An algorithm is presented that enables the fitting of complex frequency-response data to a rational transfer function. Parameter estimates are updated, without matrix inversion, as more frequency-response data become available. The method is particularly suitable for online identification.
Published: 1979
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44. Dynamic simulation of synchronous machines interconnected by long, compensated transmission circuits

Author: J.R. Smith, A.M. Parker, and G.J. Rogers
Subjects: Engineering, business.industry, General Engineering, Natural frequency, General Medicine, Instability, Compensation (engineering), Dynamic simulation, Electric power system, Electric power transmission, Transmission (telecommunications), Control theory, Electronic engineering, business, Electronic circuit
Abstract: Systems incorporating long, compensated transmission lines operating in conjunction with salient-pole hydro-generators, necessary in the full utilisation of hydropower in remote regions, may operate in particular modes that do not occur with the more conventional power systems. When series-capacitor compensation is used, the line natural frequencies are modified and an extra oscillatory mode is introduced at a frequency which may interact with the machines in the system and cause instability. The paper reports on a study of transmission-system initiated oscillations at subsynchronous frequency, brought about by the introduction of series compensation, and self-induced oscillations at a frequency coinciding with the electromechanical natural frequency of the individual machines. A mathematical model of the complete system is developed that is suitable for use in computer studies. Representative results, from the numerous studies based on this model, are collected together in the paper, and are used to show the conditions which give rise to the two categories of instability.
Published: 1976
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45. Forced oscillations in induction motors driving pulsating loads

Author: G.J. Rogers
Subjects: Physics, General Engineering, General Medicine, Mechanics, Induction motor
Published: 1975
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46. Induction-motor terminal-voltage equations

Author: G.J. Rogers
Subjects: Engineering, Field (physics), Harmonic fields, business.industry, Mathematical analysis, General Engineering, General Medicine, Permeance, Harmonic analysis, Terminal (electronics), Control theory, Electromagnetic coil, Harmonics, business, Induction motor
Abstract: Induction-motor terminal equations are derived which are valid for both steady-state and dynamic analysis. The equations take into consideration harmonic fields owing to windings concentrated in slots and to the fringing produced by the slots. It is shown that, when specific harmonics are neglected, the complete model may be reduced to commonly used simplified models. The method of analysis overcomes the theoretical objections to previous harmonic analysis of machines in that the concepts of m.m.f. and permeance are not used, and a direct approximation to the two-dimensional airgap field is obtained.
Published: 1976
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47. Digital computation of frequency response

Author: G.J. Rogers and A.C. Ioannides
Subjects: Frequency response, Digital computation, Computer science, General Engineering, Electronic engineering, General Medicine
Published: 1978
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48. Application of Power System Stabilizers for Enhancement of Overall System Stability

Author: M. S. Zywno, G.J. Rogers, P. Kundur, and M. Klein
Subjects: Engineering, Power station, business.industry, Energy Engineering and Power Technology, Thyristor, law.invention, Electric power system, Electricity generation, law, Control theory, Electrical network, Islanding, Transient (oscillation), Electrical and Electronic Engineering, business, Stabilizer (chemistry)
Abstract: This paper provides a detailed account of analytical work carried out to determine the parameters of power system stabilizers (PSS) for the Darlington nuclear generating station presently under construction in eastern Ontario. The results presented are, however, of general interest and provide a comprehensive analysis of the effects of the different stabilizer parameters on the overall dynamic performance of the power system. They show how stabilizer settings may be selected so as to enhance the steady-state and transient stability of local plant modes as well as inter-area modes in large interconnected systems. In addition, it is shown that the selected parameters result in satisfactory performance during system islanding conditions, when large frequency excursions are experienced. Darlington GS, when completed by 1992, will comprise four 1100 MVA, 0.85 p.f., 1800 RPM turbine generators with "CANDU-PHW" reactors, moderated and cooled by heavy water. The station will be incorporated into the 500 kV network through three double-circuit lines. The units will be equipped with transformer-fed thyristor excitation systems and Delta-P-Omega type PSS [1, 2].
Published: 1989
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49. Book review: The General Theory of Alternating Current Machines

Author: G.J. Rogers
Subjects: General Engineering
Published: 1978
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50. Use of equivalent fields in electrical-machine studies

Author: P. Hammond and G.J. Rogers
Subjects: Terminal (electronics), Field (physics), General Engineering, Electronic engineering, Torque, Equivalent circuit, General Medicine, Topology, Mathematics, Power (physics), Magnetic field
Abstract: The terminal behaviour of electrical machines is usually described by means of equivalent circuits. To design machines to meet a specification, the manufacturer needs to be able to relate the internal magnetic field to the circuit parameters. It is not generally possible to obtain a complete solution to the field problems, nor is this necessary. A method is described in which the field is subdivided into regions that are then matched to each other. The individual regions can be identified with circuit parameters and equivalent circuits can be constructed in which the different branches have a clear physical significance in terms of the magnetic field. The method can also be used in the calculation of power and torque.
Published: 1974
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