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Search for $\mbox{B}^0_s-\overline{\mbox{B}^0_s}$ oscillations and a measurement of $\mbox{B}^0_d-\overline{\mbox{B}^0_d}$ oscillations using events with an inclusively reconstructed vertex

J. Abdallah 1 P. Abreu W. Adam P. Adzic T. Albrecht T. Alderweireld R. Alemany-Fernandez T. Allmendinger P.P. Allport U. Amaldi N. Amapane S. Amato E. Anashkin A. Andreazza S. Andringa N. Anjos P. Antilogus W.D. Apel Y. Arnoud 2 S. Ask B. Asman J.-E. Augustin 1 A. Augustinus P. Baillon A. Ballestrero P. Bambade 3 R. Barbier D. Bardin G. Barker A. Baroncelli M. Battaglia M. Baubillier 1 K.H. Becks M. Begalli A. Behrmann E. Ben-Haim N. Benekos A. Benvenuti C. Berat 2 M. Berggren 1 L. Berntzon D. Bertrand M. Besancon N. Besson D. Bloch 4 M. Blom M. Bluj M. Bonesini M. Boonekamp P.S.L. Booth G. Borisov O. Botner B. Bouquet T.J.V. Bowcock I. Boyko M. Bracko R. Brenner E. Brodet P. Bruckman J.M. Brunet 5 L. Bugge P. Buschmann M. Calvi T. Camporesi V. Canale F. Carena N. Castro F. Cavallo M. Chapkin P. Charpentier P. Checchia R. Chierici P. Shlyapnikov J. Chudoba S.U. Chung K. Cieslik P. Collins R. Contri G. Cosme F. Cossutti M.J. Costa B. Crawley D. Crennell J. Cuevas J. d'Hondt J. Dalmau T. da Silva W. da Silva 1 G. Della Ricca A. de Angelis W. de Boer C. de Clercq B. de Lotto N. Demaria A. de Min L. de Paula L. Di Ciaccio A. Di Simone K. Doroba J. Drees M. Dris G. Eigen T. Ekelof M. Ellert M. Elsing M.C. Espirito Santo G. Fanourakis D. Fassouliotis M. Feindt J. Fernandez A. Ferrer F. Ferro U. Flagmeyer H. Foeth E. Fokitis F. Fulda-Quenzer 3 J. Fuster M. Gandelman C. Garcia P. Gavillet E. Gazis T. Geralis R. Gokieli B. Golob G. Gomez-Ceballos P. Goncalves E. Graziani G. Grosdidier 3 K. Grzelak J. Guy C. Haag A. Hallgren K. Hamacher K. Hamilton J. Hansen S. Haug F. Hauler V. Hedberg M. Hennecke H. Herr Jakobus Hoffman S.O. Holmgren P.J. Holt M.A. Houlden K. Hultqvist J.N. Jackson G. Jarlskog P. Jarry D. Jeans E.K. Johansson P.D. Johansson P. Jonsson C. Joram L. Jungermann F. Kapusta 1 S. Katsanevas E. Katsoufis G. Kernel B.P. Kersevan A. Kiiskinen B.T. King N.J. Kjaer P. Kluit P. Kokkinias C. Kourkoumelis O. Kuznetsov Z. Krumshtein M. Kucharczyk J. Lamsa G. Leder F. Ledroit 2 L. Leinonen R. Leitner J. Lemonne V. Lepeltier 3 T. Lesiak W. Liebig D. Liko A. Lipniacka J.H. Lopes J.M. Lopez D. Loukas P. Lutz L. Lyons J. Macnaughton A. Malek S. Maltezos F. Mandl J. Marco R. Marco B. Marechal M. Margoni J.C. Marin C. Mariotti A. Markou C. Martinez-Rivero J. Masik N. Mastroyiannopoulos F. Matorras C. Matteuzzi F. Mazzucato M. Mazzucato R. Mcnulty C. Meroni W.T. Meyer E. Migliore W. Mitaroff U. Mjornmark T. Moa M. Moch K. Monig R. Monge J. Montenegro D. Moraes S. Moreno P. Morettini U. Muller K. Munich M. Mulders L. Mundim W. Murray B. Muryn G. Myatt T. Myklebust M. Nassiakou F. Navarria K. Nawrocki R. Nicolaidou M. Nikolenko A. Oblakowska-Mucha V. Obraztsov A. Olshevsky A. Onofre R. Orava K. Osterberg A. Ouraou A. Oyanguren M. Paganoni S. Paiano J.P. Palacios H. Palka T.D. Papadopoulou L. Pape C. Parkes F. Parodi U. Parzefall A. Passeri O. Passon L. Peralta V. Perepelitsa A. Perrotta A. Petrolini J. Piedra L. Pieri F. Pierre M. Pimenta E. Piotto T. Podobnik V. Poireau M.E. Pol G. Polok P. Poropat V. Pozdnyakov N. Pukhaeva A. Pullia J. Rames L. Ramler A. Read P. Rebecchi J. Rehn D. Reid R. Reinhardt P. Renton F. Richard 3 J. Ridky D. Rodriguez A. Romero P. Ronchese E. Rosenberg P. Roudeau 3 T. Rovelli V. Ruhlmann-Kleider D. Ryabchikov A. Sadovsky L. Salmi J. Salt A. Savoy-Navarro 1 U. Schwickerath A.M. Segar R. Sekulin M. Siebel A. Sisakian G. Smadja O. Smirnova A. Sokolov A. Sopczak R. Sosnowski T. Spassoff M. Stanitzki A. Stocchi 3 J. Strauss B. Stugu M. Szczekowski M. Szeptycka T. Szumlak T. Tabarelli A.C. Taffard F. Tegenfeldt J. Timmermans L. Tkachev M. Tobin S. Todorova A. Tomaradze B. Tome A. Tonazzo Pablo Tortosa P. Travnicek D. Treille G. Tristram 5 M. Trochimczuk C. Troncon M.L. Turluer I.A. Tyapkin P. Tyapkin S. Tzamarias V. Uvarov G. Valenti P. van Dam J. van Eldik A. van Lysebetten N. van Remortel I. van Vulpen G. Vegni F. Veloso W. Venus F. Verbeure P. Verdier V. Verzi D. Vilanova L. Vitale V. Vrba H. Wahlen A.J. Washbrook C. Weiser D. Wicke J. Wickens G. Wilkinson M. Winter 4 M. Witek O. Yushchenko A. Zalewska P. Zalewski D. Zavrtanik N.I. Zimin A. Zinchenko M. Zupan
Abstract : Neutral B meson oscillations in the $\mbox{B}^0_s-\overline{\mbox{B}^0 _s}$ and $\mbox{B}^0_d-\overline{\mbox{B}^0_d}$ systems were studied using a sample of about 4.0 million hadronic Z decays recorded by the DELPHI detector between 1992 and 2000. Events with a high transverse momentum lepton were removed and a sample of 770 k events with an inclusively reconstructed vertex was selected. The mass difference between the two physical states in the $\mbox{B}^0_d-\over$ system was measured to be: \begin{center} $\Delta m_d = (0.531 \pm 0.025 (stat.) \pm 0.007 (syst.)) \rm ps^{-1}$. \end{center} The following limit on the width difference of these states was also obtained: \begin{center} $|\Delta\Gamma_{\rm B_d}| / \Gamma_{\rm B_d} 0.18$ at 95\% CL. \end{center} The corresponding sensitivity of this analysis is equal to 6.6 ps$^{-1}$.
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J. Abdallah, P. Abreu, W. Adam, P. Adzic, T. Albrecht, et al.. Search for $\mbox{B}^0_s-\overline{\mbox{B}^0_s}$ oscillations and a measurement of $\mbox{B}^0_d-\overline{\mbox{B}^0_d}$ oscillations using events with an inclusively reconstructed vertex. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2003, 28, pp.155-173. ⟨10.1140/epjc/s2003-01183-7⟩. ⟨in2p3-00021508⟩

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