Determination of $\mid V_{ub} \mid/\mid V_{cb} \mid$ with DELPHI at LEP - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Physics Letters B Year : 2000

Determination of $\mid V_{ub} \mid/\mid V_{cb} \mid$ with DELPHI at LEP

P. Abreu , W. Adam , T. Adye , P. Adzic , Z. Albrecht , T. Alderweireld , G.D. Alekseev , R. Alemany , T. Allmendinger , P.P. Allport , S. Almehed , U. Amaldi , N. Amapane , S. Amato , E.G. Anassontzis , P. Andersson , A. Andreazza , S. Andringa , P. Antilogus (1) , W.D. Apel , Y. Arnoud , B. Asman , J.-E. Augustin (1) , A. Augustinus , P. Baillon , P. Bambade (2) , F. Barao , Guido Barbiellini , R. Barbier (1) , D.Yu. Bardin , G. Barker , A. Baroncelli , M. Battaglia , M. Baubillier (3) , K.H. Becks , M. Begalli , A. Behrmann , P. Beilliere , Yu. Belokopytov , K. Belous , N.C. Benekos , A.C. Benvenuti , C. Berat (4) , M. Berggren , D. Bertrand , M. Besancon , M. Bigi , M.S. Bilenkii , M.A. Bizouard (2) , D. Bloch (5) , H.M. Blom , M. Bonesini , M. Boonekamp , P.S.L. Booth , A.W. Borgland , G. Borisov (2) , C. Bosio , O. Botner , E. Boudinov , B. Bouquet (2) , C. Bourdarios (2) , T.J.V. Bowcock , I. Boyko , I. Bozovic , M. Bozzo , M. Bracko , P. Branchini , R.A. Brenner , P. Bruckman , J.M. Brunet (6) , L. Bugge , T. Buran , B. Buschbeck , P. Buschmann , S. Cabrera , M. Caccia , M. Calvi , T. Camporesi , V. Canale , F. Carena , L. Carroll , C. Caso , M.V. Castillo Gimenez , A. Cattai , F.R. Cavallo , V. Chabaud , M. Chapkin , P. Charpentier , P. Checchia , G.A. Chelkov , R. Chierici , P. Shlyapnikov , P. Chochula , V. Chorowicz , J. Chudoba , K. Cieslik , P. Collins , R. Contri , E. Cortina , G. Cosme , F. Cossutti , H.B. Crawley , D. Crennell , S. Crepe (4) , G. Crosetti , J. Cuevas Maestro , S. Czellar , M. Davenport , W. da Silva (3) , G. Della Ricca , P.A. Delpierre (7) , N. Demaria , A. de Angelis , W. de Boer , C. de Clercq , B. de Lotto , A. de Min , L. de Paula , H. Dijkstra , L. Di Ciaccio , J. Dolbeau (6) , K. Doroba , M. Dracos (5) , J. Drees , M. Dris , A. Duperrin , J.D. Durand , G. Eigen , T. Ekelof , G. Ekspong , M. Ellert , M. Elsing , J.P. Engel (5) , M. Espirito Santo , G. Fanourakis , D. Fassouliotis , J. Fayot (3) , M. Feindt , A. Ferrer , E. Ferrer-Ribas (2) , F. Ferro , S. Fichet (3) , A. Firestone , U. Flagmeyer , H. Foeth , E. Fokitis , F. Fontanelli , B. Franek , A.G. Frodesen , R. Fruhwirth , F. Fulda-Quenzer (2) , J. Fuster , A. Galloni , D. Gamba , S. Gamblin (2) , M. Gandelman , C. Garcia , C. Gaspar , M. Gaspar , U. Gasparini , P. Gavillet , E.N. Gazis , D. Gele (5) , N. Ghodbane (1) , I. Gil , F. Glege , R. Gokieli , B. Golob , G. Gomez-Ceballos , P. Goncalves , I. Gonzalez Caballero , G. Gopal , L. Gorn , Yu. Guz , V. Gracco , J. Grahl , E. Graziani , P. Gris , G. Grosdidier , K. Grzelak , J. Guy , C. Haag , F. Hahn , S. Hahn , S. Haider , A. Hallgren , K. Hamacher , J. Hansen , F.J. Harris , V. Hedberg , S. Heising , J.J. Hernandez , P. Herquet , H. Herr , T.L. Hessing , J.M. Heuser , E. Higon , S.O. Holmgren , P.J. Holt , S. Hoorelbeke , M. Houlden , J. Hrubec , M. Huber , K. Huet , G.J. Hughes , K. Hultqvist , J.N. Jackson , R. Jacobsson , P. Jalocha , R. Janik , C. Jarlskog , G. Jarlskog , P. Jarry , B. Jean-Marie (2) , D. Jeans , E.K. Johansson , P. Jonsson (1) , C. Joram , P. Juillot (5) , L. Jungermann , F. Kapusta (3) , K. Karafasoulis , S. Katsanevas (1) , E.C. Katsoufis , R. Keranen , G. Kernel , B.P. Kersevan , B.A. Khomenko , N.N. Khovanskii , A. Kiiskinen , B.J. King , A. Kinvig , N.J. Kjaer , O. Klapp , H. Klein , P. Kluit , P. Kokkinias , V. Kostyukhin , C. Kourkoumelis , O. Kuznetsov , M. Krammer , E. Kriznic , Z. Krumshtein , P. Kubinec , J. Kurowska , K. Kurvinen , J.W. Lamsa , D.W. Lane , V. Lapin , J.P. Laugier , R. Lauhakangas , G. Leder , F. Ledroit (4) , V. Lefebure , L. Leinonen , A. Leisos , R. Leitner , G. Lenzen , V. Lepeltier (2) , T. Lesiak , M. Lethuillier (1) , J. Libby , W. Liebig , D. Liko , A. Lipniacka , I. Lippi , B. Loerstad , J.G. Loken , J.H. Lopes , J.M. Lopez , R. Lopez-Fernandez (4) , D. Loukas , P. Lutz , L. Lyons , J. Macnaughton , J.R. Mahon , A. Maio , A. Malek , T.G.M. Malmgren , S. Maltezos , V. Malychev , F. Mandl , J. Marco , R. Marco , B. Marechal , M. Margoni , J.C. Marin , C. Mariotti , A. Markou , C. Martinez-Rivero , F. Martinez-Vidal (3) , I Garcia S. Marti , J. Masik , N. Mastroyiannopo Ulos , F. Matorras , C. Matteuzzi , G. Matthiae , F. Mazzucato , M. Mazzucato , M. Mccubbin , R. Mckay , R. Mcnulty , G. Mcpherson , C. Meroni , W.T. Meyer , E. Migliore , L. Mirabito (1) , W.A. Mitaroff , U. Mjornmark , T. Moa , M. Moch , R. Moller , K. Monig , M.R. Monge , D. Moraes , X. Moreau (3) , P. Morettini , G. Morton , U. Mueller , K. Muenich , M. Mulders , C. Mulet-Marquis (4) , R. Muresan , W.J. Murray , B. Muryn , G. Myatt , T. Myklebust , F. Naraghi (4) , M. Nassiakou , F.L. Navarria , S. Navas , K. Nawrocki , P. Negri , N. Neufeld , R. Nicolaidou , B.S. Nielsen , P. Niezurawski , M. Nikolenko (5) , V. Nomokonov , A. Nygren , V.F. Obraztsov , A.G. Olshevskii , A. Onofre , R. Orava , G. Orazi (5) , K. Osterberg , A. Ouraou , M. Paganoni , S. Paiano , R. Pain (3) , R. Paiva , J. Palacios , H. Palka , T.D. Papadopoulou , K. Papageorgiou , L. Pape , C. Parkes , F. Parodi , U. Parzefall , A. Passeri , O. Passon , T. Pavel , M. Pegoraro , L. Peralta , M. Pernicka , A. Perrotta , C. Petridou , A. Petrolini , H.T. Phillips , F. Pierre , M. Pimenta , E. Piotto , T. Podobnik , M.E. Pol , G. Polok , P. Poropat , V. Pozdnyakov , P. Privitera , N. Pukhaeva , A. Pullia , D. Radojicic , S. Ragazzi , H. Rahmani , J. Rames , P.N. Ratoff , A.L. Read , P. Rebecchi , N.G. Redaelli , M. Regler , J. Rehn , D. Reid , R. Reinhardt , P.B. Renton , L.K. Resvanis , F. Richard (2) , J. Ridky , G. Rinaudo , I. Ripp-Baudot (5) , O. Rohne , A. Romero , P. Ronchese , E.I. Rosenberg , P. Rosinsky , P. Roudeau (2) , T. Rovelli , C. Royon , V. Ruhlmann-Kleider , A. Ruiz , H. Saarikko , Y. Sacquin , A. Sadovskii , G. Sajot (4) , J. Salt , D. Sampsonidis , M. Sannino , P. Schwemling (3) , B. Schwering , U. Schwickerath , F. Scuri , P. Seager , Yu. Sedykh , A.M. Segar , N. Seibert , R. Sekulin , R.C. Shellard , M. Siebel , L. Simard , F. Simonetto , A.N. Sissakian , G. Smadja (1) , O. Smirnova , G.R. Smith , A. Sokolov , O. Solovyanov , A. Sopczak , R. Sosnowski , Tz. Spassoff , E. Spiriti , S. Squarcia , C. Stanescu , S. Stanic , M. Stanitzki , K. Stevenson , A. Stocchi (2) , J. Strauss , R. Strub (5) , B. Stugu , M. Szczekowski , M. Szeptycka , T. Tabarelli de Fatis , A. Taffard , F. Tegenfeldt , F. Terranova , J. Thomas , J. Timmermans , N. Tinti , L.G. Tkatchev , M. Tobin , S. Todorova , A.G. Tomaradze , B. Tome , A. Tonazzo , L. Tortora , Pablo Tortosa , G. Transtromer , D. Treille , G. Tristram (6) , M. Trochimczuk , C. Troncon , M.L. Turluer , I.A. Tyapkin , S. Tzamarias , O. Ullaland , V. Uvarov , G. Valenti , E. Vallazza , C. Vander Velde , P. van Dam , W. Vanden Boeck , W.K. van Doninck , J. van Eldik , A. van Lysebetten , N. van Remortel , I. van Vulpen , G. Vegni , Laurent Ventura , W. Venus , F. Verbeure , P. Verdier , M. Verlato , L.S. Vertogradov , V. Verzi , D. Vilanova , L. Vitale , E. Vlasov , A. Vodopyanov , G. Voulgaris , V. Vrba , H. Wahlen , C. Walck , A.J. Washbrook , C. Weiser , D. Wicke , J.H. Wickens , G.R. Wilkinson , M. Winter (5) , M. Witek , G. Wolf , J. Yi , O. Yushchenko , A. Zaitsev , A. Zalewska , P. Zalewski , D. Zavrtanik , E. Zevgolatakos , N.I. Zimin , A. Zintchenko , P. Zoller (5) , G.C. Zucchelli , G. Zumerle
P. Abreu
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W. Adam
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T. Adye
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P. Adzic
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Z. Albrecht
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T. Alderweireld
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G.D. Alekseev
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R. Alemany
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T. Allmendinger
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P.P. Allport
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S. Almehed
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U. Amaldi
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N. Amapane
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S. Amato
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E.G. Anassontzis
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P. Andersson
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A. Andreazza
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S. Andringa
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P. Antilogus
W.D. Apel
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Y. Arnoud
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B. Asman
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A. Augustinus
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P. Baillon
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F. Barao
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Guido Barbiellini
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D.Yu. Bardin
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G. Barker
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A. Baroncelli
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M. Battaglia
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K.H. Becks
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M. Begalli
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A. Behrmann
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P. Beilliere
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Yu. Belokopytov
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K. Belous
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N.C. Benekos
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A.C. Benvenuti
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M. Berggren
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D. Bertrand
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M. Besancon
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M. Bigi
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M.S. Bilenkii
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H.M. Blom
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M. Bonesini
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M. Boonekamp
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P.S.L. Booth
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A.W. Borgland
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G. Borisov
C. Bosio
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O. Botner
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E. Boudinov
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T.J.V. Bowcock
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I. Boyko
I. Bozovic
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M. Bozzo
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M. Bracko
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P. Branchini
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R.A. Brenner
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P. Bruckman
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L. Bugge
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T. Buran
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B. Buschbeck
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P. Buschmann
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S. Cabrera
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M. Caccia
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M. Calvi
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T. Camporesi
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V. Canale
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F. Carena
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L. Carroll
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C. Caso
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M.V. Castillo Gimenez
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A. Cattai
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F.R. Cavallo
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V. Chabaud
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M. Chapkin
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P. Charpentier
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P. Checchia
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G.A. Chelkov
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R. Chierici
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P. Shlyapnikov
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P. Chochula
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V. Chorowicz
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J. Chudoba
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K. Cieslik
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P. Collins
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R. Contri
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E. Cortina
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G. Cosme
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F. Cossutti
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H.B. Crawley
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D. Crennell
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G. Crosetti
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J. Cuevas Maestro
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S. Czellar
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M. Davenport
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G. Della Ricca
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N. Demaria
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A. de Angelis
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W. de Boer
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C. de Clercq
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B. de Lotto
A. de Min
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L. de Paula
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H. Dijkstra
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L. Di Ciaccio
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K. Doroba
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M. Dracos
J. Drees
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M. Dris
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A. Duperrin
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J.D. Durand
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G. Eigen
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T. Ekelof
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G. Ekspong
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M. Ellert
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M. Elsing
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M. Espirito Santo
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G. Fanourakis
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D. Fassouliotis
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M. Feindt
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A. Ferrer
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F. Ferro
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A. Firestone
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U. Flagmeyer
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H. Foeth
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E. Fokitis
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F. Fontanelli
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B. Franek
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A.G. Frodesen
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R. Fruhwirth
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J. Fuster
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A. Galloni
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D. Gamba
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M. Gandelman
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C. Garcia
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C. Gaspar
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M. Gaspar
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U. Gasparini
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P. Gavillet
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E.N. Gazis
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I. Gil
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F. Glege
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R. Gokieli
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B. Golob
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G. Gomez-Ceballos
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P. Goncalves
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I. Gonzalez Caballero
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G. Gopal
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L. Gorn
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Yu. Guz
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V. Gracco
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J. Grahl
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E. Graziani
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P. Gris
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G. Grosdidier
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K. Grzelak
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J. Guy
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C. Haag
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F. Hahn
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S. Hahn
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S. Haider
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A. Hallgren
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K. Hamacher
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J. Hansen
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F.J. Harris
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V. Hedberg
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S. Heising
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J.J. Hernandez
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P. Herquet
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H. Herr
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T.L. Hessing
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J.M. Heuser
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E. Higon
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S.O. Holmgren
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P.J. Holt
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S. Hoorelbeke
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M. Houlden
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J. Hrubec
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M. Huber
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K. Huet
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G.J. Hughes
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K. Hultqvist
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J.N. Jackson
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R. Jacobsson
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P. Jalocha
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R. Janik
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C. Jarlskog
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G. Jarlskog
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P. Jarry
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D. Jeans
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E.K. Johansson
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C. Joram
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L. Jungermann
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K. Karafasoulis
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E.C. Katsoufis
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R. Keranen
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G. Kernel
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B.P. Kersevan
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B.A. Khomenko
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N.N. Khovanskii
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A. Kiiskinen
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B.J. King
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A. Kinvig
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N.J. Kjaer
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O. Klapp
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H. Klein
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P. Kluit
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P. Kokkinias
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V. Kostyukhin
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C. Kourkoumelis
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O. Kuznetsov
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M. Krammer
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E. Kriznic
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Z. Krumshtein
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P. Kubinec
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J. Kurowska
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K. Kurvinen
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J.W. Lamsa
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D.W. Lane
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V. Lapin
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J.P. Laugier
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R. Lauhakangas
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G. Leder
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V. Lefebure
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L. Leinonen
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A. Leisos
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R. Leitner
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G. Lenzen
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T. Lesiak
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M. Lethuillier
J. Libby
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W. Liebig
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D. Liko
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A. Lipniacka
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I. Lippi
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B. Loerstad
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J.G. Loken
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J.H. Lopes
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J.M. Lopez
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D. Loukas
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P. Lutz
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L. Lyons
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J. Macnaughton
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J.R. Mahon
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A. Maio
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A. Malek
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T.G.M. Malmgren
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S. Maltezos
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V. Malychev
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F. Mandl
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J. Marco
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R. Marco
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B. Marechal
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M. Margoni
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J.C. Marin
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C. Mariotti
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A. Markou
C. Martinez-Rivero
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I Garcia S. Marti
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J. Masik
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N. Mastroyiannopo Ulos
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F. Matorras
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C. Matteuzzi
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G. Matthiae
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F. Mazzucato
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M. Mazzucato
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M. Mccubbin
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R. Mckay
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R. Mcnulty
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G. Mcpherson
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C. Meroni
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W.T. Meyer
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E. Migliore
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W.A. Mitaroff
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U. Mjornmark
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T. Moa
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M. Moch
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R. Moller
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K. Monig
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M.R. Monge
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D. Moraes
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P. Morettini
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G. Morton
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U. Mueller
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K. Muenich
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M. Mulders
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R. Muresan
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W.J. Murray
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B. Muryn
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G. Myatt
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T. Myklebust
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M. Nassiakou
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F.L. Navarria
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S. Navas
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K. Nawrocki
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P. Negri
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N. Neufeld
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R. Nicolaidou
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B.S. Nielsen
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P. Niezurawski
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V. Nomokonov
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A. Nygren
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V.F. Obraztsov
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A.G. Olshevskii
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A. Onofre
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R. Orava
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K. Osterberg
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A. Ouraou
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M. Paganoni
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S. Paiano
R. Paiva
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J. Palacios
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H. Palka
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T.D. Papadopoulou
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K. Papageorgiou
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L. Pape
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C. Parkes
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F. Parodi
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U. Parzefall
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A. Passeri
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O. Passon
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T. Pavel
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M. Pegoraro
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L. Peralta
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M. Pernicka
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A. Perrotta
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C. Petridou
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A. Petrolini
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H.T. Phillips
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F. Pierre
M. Pimenta
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E. Piotto
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T. Podobnik
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M.E. Pol
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G. Polok
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P. Poropat
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V. Pozdnyakov
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P. Privitera
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N. Pukhaeva
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Abstract

The ratio of the CKM quark-mixing matrix elements |V_{ub}|/|V_{cb}|has been measured using B hadron semileptonic decays.The analysis is based on a novel technique, recently proposed by theoreticians, that uses the reconstructed mass M_X ofthe secondary hadronic system produced in association with an identified lepton.Since B rightarrow X_u \ell \bar \nu transitions are characterisedby hadronic masses below those of the $D$ mesons produced inB \rightarrow X_c \ell \bar \nu transitions, events with a reconstructed value of M_X significantly below the D massare selected.Further signal enrichments are obtained using thetopology of reconstructed decays and hadron identification.A fit to the numbers of decays in the b\to u enriched and depleted samples with M_X above and below 1.6 GeV/c^2and to the shapes of the lepton energy distribution in the Brest frame gives |V_{ub}|/|V_{cb}|= \mathrm{0.103^{+0.011}_{-0.012}~(stat.)\pm0.016~(syst.)\pm0.010~(mo del)}%The model dependance of $b \rightarrow u \ell \bar \nu$%is significantly reduced with this method.and, correspondingly, a charmless semileptonic $B$ decay branching fractionof BR($B \rightarrow X_u \ell \bar \nu) = \mathrm{(1.57 \pm 0.35~(stat.)\pm0.48~(syst.)\pm0.27~(model))\times 10^{-3}}$.
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Dates and versions

in2p3-00004110 , version 1 (02-05-2000)

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P. Abreu, W. Adam, T. Adye, P. Adzic, Z. Albrecht, et al.. Determination of $\mid V_{ub} \mid/\mid V_{cb} \mid$ with DELPHI at LEP. Physics Letters B, 2000, 478, pp.14-30. ⟨10.1016/S0370-2693(00)00281-1⟩. ⟨in2p3-00004110⟩
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