Search for a fourth generation b’-quark at LEP-II at $\sqrt{s}=\,$ 196–209 GeV - The European Physical Journal C

Search for a fourth generation b’-quark at LEP-II at $\sqrt{s}=\,$ 196–209 GeV - The European Physical Journal C

Abdallah, J.;Abreu, P.;Adam, W.;Adzic, P.;Albrecht, T.;Alemany-Fernandez, R.;Allmendinger, T.;Allport, P.P.;Amaldi, U.;Amapane, N.;Amato, S.;Anashkin, E.;Andreazza, A.;Andringa, S.;Anjos, N.;Antilogus, P.;Apel, W.-D.;Arnoud, Y.;Ask, S.;Asman, B.;Augustin, J.E.;Augustinus, A.;Baillon, P.;Ballestrero, A.;Bambade, P.;Barbier, R.;Bardin, D.;Barker, G.J.;Baroncelli, A.;Battaglia, M.;Baubillier, M.;Becks, K-H.;Begalli, M.;Behrmann, A.;Ben-Haim, E.;Benekos, N.;Benvenuti, A.;Berat, C.;Berggren, M.;Berntzon, L.;Bertrand, D.;Besancon, M.;Besson, N.;Bloch, D.;Blom, M.;Bluj, M.;Bonesini, M.;Boonekamp, M.;Booth, P.S.L.;Borisov, G.;Botner, O.;Bouquet, B.;Bowcock, T.J.V.;Boyko, I.;Bracko, M.;Brenner, R.;Brodet, E.;Bruckman, P.;Brunet, J.M.;Buschbeck, B.;Buschmann, P.;Calvi, M.;Camporesi, T.;Canale, V.;Carena, F.;Castro, N.;Cavallo, F.;Chapkin, M.;Charpentier, Ph.;Checchia, P.;Chierici, R.;Chliapnikov, P.;Chudoba, J.;Chung, S.U.;Cieslik, K.;Collins, P.;Contri, R.;Cosme, G.;Cossutti, F.;Costa, M.J.;Crennell, D.;Cuevas, J.;D’Hondt, J.;Dalmau, J.;Da Silva, T.;Da Silva, W.;Della Ricca, G.;De Angelis, A.;De Boer, W.;De Clercq, C.;De Lotto, B.;De Maria, N.;De Min, A.;de Paula, L.;Di Ciaccio, L.;Di Simone, A.;Doroba, K.;Drees, J.;Eigen, G.;Ekelof, T.;Ellert, M.;Elsing, M.;Espirito Santo, M.C.;Fanourakis, G.;Fassouliotis, D.;Feindt, M.;Fernandez, J.;Ferrer, A.;Ferro, F.;Flagmeyer, U.;Foeth, H.;Fokitis, E.;Fulda-Quenzer, F.;Fuster, J.;Gandelman, M.;Garcia, C.;Gavillet, Ph.;Gazis, E.;Gokieli, R.;Golob, B.;Gomez-Ceballos, G.;Goncalves, P.;Graziani, E.;Grosdidier, G.;Grzelak, K.;Guy, J.;Haag, C.;Hallgren, A.;Hamacher, K.;Hamilton, K.;Haug, S.;Hauler, F.;Hedberg, V.;Hennecke, M.;Herr, H.;Hoffman, J.;Holmgren, S-O.;Holt, P.J.;Houlden, M.A.;Jackson, J.N.;Jarlskog, G.;Jarry, P.;Jeans, D.;Johansson, E.K.;Johansson, P.D.;Jonsson, P.;Joram, C.;Jungermann, L.;Kapusta, F.;Katsanevas, S.;Katsoufis, E.;Kernel, G.;Kersevan, B.P.;Kerzel, U.;King, B.T.;Kjaer, N.J.;Kluit, P.;Kokkinias, P.;Kourkoumelis, C.;Kouznetsov, O.;Krumstein, Z.;Kucharczyk, M.;Lamsa, J.;Leder, G.;Ledroit, F.;Leinonen, L.;Leitner, R.;Lemonne, J.;Lepeltier, V.;Lesiak, T.;Liebig, W.;Liko, D.;Lipniacka, A.;Lopes, J.H.;Lopez, J.M.;Loukas, D.;Lutz, P.;Lyons, L.;MacNaughton, J.;Malek, A.;Maltezos, S.;Mandl, F.;Marco, J.;Marco, R.;Marechal, B.;Margoni, M.;Marin, J-C.;Mariotti, C.;Markou, A.;Martinez-Rivero, C.;Masik, J.;Mastroyiannopoulos, N.;Matorras, F.;Matteuzzi, C.;Mazzucato, F.;Mazzucato, M.;Mc Nulty, R.;Meroni, C.;Migliore, E.;Mitaroff, W.;Mjoernmark, U.;Moa, T.;Moch, M.;Moenig, K.;Monge, R.;Montenegro, J.;Moraes, D.;Moreno, S.;Morettini, P.;Mueller, U.;Muenich, K.;Mulders, M.;Mundim, L.;Murray, W.;Muryn, B.;Myatt, G.;Myklebust, T.;Nassiakou, M.;Navarria, F.;Nawrocki, K.;Nicolaidou, R.;Nikolenko, M.;Oblakowska-Mucha, A.;Obraztsov, V.;Oliveira, O.;Oliveira, S.M.;Olshevski, A.;Onofre, A.;Orava, R.;Osterberg, K.;Ouraou, A.;Oyanguren, A.;Paganoni, M.;Paiano, S.;Palacios, J.P.;Palka, H.;Papadopoulou, Th.D.;Pape, L.;Parkes, C.;Parodi, F.;Parzefall, U.;Passeri, A.;Passon, O.;Peralta, L.;Perepelitsa, V.;Perrotta, A.;Petrolini, A.;Piedra, J.;Pieri, L.;Pierre, F.;Pimenta, M.;Piotto, E.;Podobnik, T.;Poireau, V.;Pol, M.E.;Polok, G.;Pozdniakov, V.;Pukhaeva, N.;Pullia, A.;Rames, J.;Read, A.;Rebecchi, P.;Rehn, J.;Reid, D.;Reinhardt, R.;Renton, P.;Richard, F.;Ridky, J.;Rivero, M.;Rodriguez, D.;Romero, A.;Ronchese, P.;Roudeau, P.;Rovelli, T.;Ruhlmann-Kleider, V.;Ryabtchikov, D.;Sadovsky, A.;Salmi, L.;Salt, J.;Sander, C.;Santos, R.;Savoy-Navarro, A.;Schwickerath, U.;Sekulin, R.;Siebel, M.;Sisakian, A.;Smadja, G.;Smirnova, O.;Sokolov, A.;Sopczak, A.;Sosnowski, R.;Spassov, T.;Stanitzki, M.;Stocchi, A.;Strauss, J.;Stugu, B.;Szczekowski, M.;Szeptycka, M.;Szumlak, T.;Tabarelli, T.;Taffard, A.C.;Tegenfeldt, F.;Timmermans, J.;Tkatchev, L.;Tobin, M.;Todorovova, S.;Tome, B.;Tonazzo, A.;Tortosa, P.;Travnicek, P.;Treille, D.;Tristram, G.;Trochimczuk, M.;Troncon, C.;Turluer, M-L.;Tyapkin, I.A.;Tyapkin, P.;Tzamarias, S.;Uvarov, V.;Valenti, G.;Van Dam, P.;Van Eldik, J.;Van Remortel, N.;Van Vulpen, I.;Vegni, G.;Veloso, F.;Venus, W.;Verdier, P.;Verzi, V.;Vilanova, D.;Vitale, L.;Vrba, V.;Wahlen, H.;Washbrook, A.J.;Weiser, C.;Wicke, D.;Wickens, J.;Wilkinson, G.;Winter, M.;Witek, M.;Yushchenko, O.;Zalewska, A.;Zalewski, P.;Zavrtanik, D.;Zhuravlov, V.;Zimin, N.I.;Zintchenko, A.;Zupan, M.;Abdallah, J.;Abreu, P.;Adam, W.;Adzic, P.;Albrecht, T.;Alemany-Fernandez, R.;Allmendinger, T.;Allport, P.P.;Amaldi, U.;Amapane, N.;Amato, S.;Anashkin, E.;Andreazza, A.;Andringa, S.;Anjos, N.;Antilogus, P.;Apel, W.-D.;Arnoud, Y.;Ask, S.;Asman, B.;Augustin, J.E.;Augustinus, A.;Baillon, P.;Ballestrero, A.;Bambade, P.;Barbier, R.;Bardin, D.;Barker, G.J.;Baroncelli, A.;Battaglia, M.;Baubillier, M.;Becks, K-H.;Begalli, M.;Behrmann, A.;Ben-Haim, E.;Benekos, N.;Benvenuti, A.;Berat, C.;Berggren, M.;Berntzon, L.;Bertrand, D.;Besancon, M.;Besson, N.;Bloch, D.;Blom, M.;Bluj, M.;Bonesini, M.;Boonekamp, M.;Booth, P.S.L.;Borisov, G.;Botner, O.;Bouquet, B.;Bowcock, T.J.V.;Boyko, I.;Bracko, M.;Brenner, R.;Brodet, E.;Bruckman, P.;Brunet, J.M.;Buschbeck, B.;Buschmann, P.;Calvi, M.;Camporesi, T.;Canale, V.;Carena, F.;Castro, N.;Cavallo, F.;Chapkin, M.;Charpentier, Ph.;Checchia, P.;Chierici, R.;Chliapnikov, P.;Chudoba, J.;Chung, S.U.;Cieslik, K.;Collins, P.;Contri, R.;Cosme, G.;Cossutti, F.;Costa, M.J.;Crennell, D.;Cuevas, J.;D’Hondt, J.;Dalmau, J.;Da Silva, T.;Da Silva, W.;Della Ricca, G.;De Angelis, A.;De Boer, W.;De Clercq, C.;De Lotto, B.;De Maria, N.;De Min, A.;de Paula, L.;Di Ciaccio, L.;Di Simone, A.;Doroba, K.;Drees, J.;Eigen, G.;Ekelof, T.;Ellert, M.;Elsing, M.;Espirito Santo, M.C.;Fanourakis, G.;Fassouliotis, D.;Feindt, M.;Fernandez, J.;Ferrer, A.;Ferro, F.;Flagmeyer, U.;Foeth, H.;Fokitis, E.;Fulda-Quenzer, F.;Fuster, J.;Gandelman, M.;Garcia, C.;Gavillet, Ph.;Gazis, E.;Gokieli, R.;Golob, B.;Gomez-Ceballos, G.;Goncalves, P.;Graziani, E.;Grosdidier, G.;Grzelak, K.;Guy, J.;Haag, C.;Hallgren, A.;Hamacher, K.;Hamilton, K.;Haug, S.;Hauler, F.;Hedberg, V.;Hennecke, M.;Herr, H.;Hoffman, J.;Holmgren, S-O.;Holt, P.J.;Houlden, M.A.;Jackson, J.N.;Jarlskog, G.;Jarry, P.;Jeans, D.;Johansson, E.K.;Johansson, P.D.;Jonsson, P.;Joram, C.;Jungermann, L.;Kapusta, F.;Katsanevas, S.;Katsoufis, E.;Kernel, G.;Kersevan, B.P.;Kerzel, U.;King, B.T.;Kjaer, N.J.;Kluit, P.;Kokkinias, P.;Kourkoumelis, C.;Kouznetsov, O.;Krumstein, Z.;Kucharczyk, M.;Lamsa, J.;Leder, G.;Ledroit, F.;Leinonen, L.;Leitner, R.;Lemonne, J.;Lepeltier, V.;Lesiak, T.;Liebig, W.;Liko, D.;Lipniacka, A.;Lopes, J.H.;Lopez, J.M.;Loukas, D.;Lutz, P.;Lyons, L.;MacNaughton, J.;Malek, A.;Maltezos, S.;Mandl, F.;Marco, J.;Marco, R.;Marechal, B.;Margoni, M.;Marin, J-C.;Mariotti, C.;Markou, A.;Martinez-Rivero, C.;Masik, J.;Mastroyiannopoulos, N.;Matorras, F.;Matteuzzi, C.;Mazzucato, F.;Mazzucato, M.;Mc Nulty, R.;Meroni, C.;Migliore, E.;Mitaroff, W.;Mjoernmark, U.;Moa, T.;Moch, M.;Moenig, K.;Monge, R.;Montenegro, J.;Moraes, D.;Moreno, S.;Morettini, P.;Mueller, U.;Muenich, K.;Mulders, M.;Mundim, L.;Murray, W.;Muryn, B.;Myatt, G.;Myklebust, T.;Nassiakou, M.;Navarria, F.;Nawrocki, K.;Nicolaidou, R.;Nikolenko, M.;Oblakowska-Mucha, A.;Obraztsov, V.;Oliveira, O.;Oliveira, S.M.;Olshevski, A.;Onofre, A.;Orava, R.;Osterberg, K.;Ouraou, A.;Oyanguren, A.;Paganoni, M.;Paiano, S.;Palacios, J.P.;Palka, H.;Papadopoulou, Th.D.;Pape, L.;Parkes, C.;Parodi, F.;Parzefall, U.;Passeri, A.;Passon, O.;Peralta, L.;Perepelitsa, V.;Perrotta, A.;Petrolini, A.;Piedra, J.;Pieri, L.;Pierre, F.;Pimenta, M.;Piotto, E.;Podobnik, T.;Poireau, V.;Pol, M.E.;Polok, G.;Pozdniakov, V.;Pukhaeva, N.;Pullia, A.;Rames, J.;Read, A.;Rebecchi, P.;Rehn, J.;Reid, D.;Reinhardt, R.;Renton, P.;Richard, F.;Ridky, J.;Rivero, M.;Rodriguez, D.;Romero, A.;Ronchese, P.;Roudeau, P.;Rovelli, T.;Ruhlmann-Kleider, V.;Ryabtchikov, D.;Sadovsky, A.;Salmi, L.;Salt, J.;Sander, C.;Santos, R.;Savoy-Navarro, A.;Schwickerath, U.;Sekulin, R.;Siebel, M.;Sisakian, A.;Smadja, G.;Smirnova, O.;Sokolov, A.;Sopczak, A.;Sosnowski, R.;Spassov, T.;Stanitzki, M.;Stocchi, A.;Strauss, J.;Stugu, B.;Szczekowski, M.;Szeptycka, M.;Szumlak, T.;Tabarelli, T.;Taffard, A.C.;Tegenfeldt, F.;Timmermans, J.;Tkatchev, L.;Tobin, M.;Todorovova, S.;Tome, B.;Tonazzo, A.;Tortosa, P.;Travnicek, P.;Treille, D.;Tristram, G.;Trochimczuk, M.;Troncon, C.;Turluer, M-L.;Tyapkin, I.A.;Tyapkin, P.;Tzamarias, S.;Uvarov, V.;Valenti, G.;Van Dam, P.;Van Eldik, J.;Van Remortel, N.;Van Vulpen, I.;Vegni, G.;Veloso, F.;Venus, W.;Verdier, P.;Verzi, V.;Vilanova, D.;Vitale, L.;Vrba, V.;Wahlen, H.;Washbrook, A.J.;Weiser, C.;Wicke, D.;Wickens, J.;Wilkinson, G.;Winter, M.;Witek, M.;Yushchenko, O.;Zalewska, A.;Zalewski, P.;Zavrtanik, D.;Zhuravlov, V.;Zimin, N.I.;Zintchenko, A.;Zupan, M.;
the european physical journal c 2007 Vol. 50 pp. 507-518
2
j.2007thesearch

Abstract

A search for the pair production of fourth generation b’-quarks was performed using data taken by the DELPHI detector at LEP-II. The analysed data were collected at centre-of-mass energies ranging from 196 to 209 GeV, corresponding to an integrated luminosity of 420 pb-1. No evidence for a signal was found. Upper limits on BR(b’→bZ) and BR(b’→cW) were obtained for b’ masses ranging from 96 to 103 GeV/c 2. These limits, together with the theoretical branching ratios predicted by a sequential four generations model, were used to constrain the value of $R_{\text{CKM}}=|\frac{V_{cb\prime}}{V_{\text{tb}\prime}V_{tb}}|$ , where Vcb′, Vtb′ and Vtb are elements of the extended CKM matrix.

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