Precision measurement of the Lambda_b baryon lifetime
High Energy Physics - Experiment
2016-03-27 v2 High Energy Physics - Lattice
High Energy Physics - Phenomenology
Abstract
The ratio of the \Lambda b baryon lifetime to that of the B0 meson is measured using 1.0/fb of integrated luminosity in 7 TeV center-of-mass energy pp collisions at the LHC. The \Lambda b baryon is observed for the first time in the decay mode \Lambda b -> J/\psi pK-, while the B0 meson decay used is the well known B0 -> J/\psi pi+K- mode, where the pi+ K- mass is consistent with that of the K*0(892) meson. The ratio of lifetimes is measured to be 0.976 +/- 0.012 +/- 0.006, in agreement with theoretical expectations based on the heavy quark expansion. Using previous determinations of the B0 meson lifetime, the \Lambda b lifetime is found to be 1.482 +/- 0.018 +/- 0.012 ps. In both cases the first uncertainty is statistical and the second systematic.
Cite
@article{arxiv.1307.2476,
title = {Precision measurement of the Lambda_b baryon lifetime},
author = {LHCb collaboration and R. Aaij and B. Adeva and M. Adinolfi and C. Adrover and A. Affolder and Z. Ajaltouni and J. Albrecht and F. Alessio and M. Alexander and S. Ali and G. Alkhazov and P. Alvarez Cartelle and A. A. Alves and S. Amato and S. Amerio and Y. Amhis and L. Anderlini and J. Anderson and R. Andreassen and J. E. Andrews and R. B. Appleby and O. Aquines Gutierrez and F. Archilli and A. Artamonov and M. Artuso and E. Aslanides and G. Auriemma and M. Baalouch and S. Bachmann and J. J. Back and C. Baesso and V. Balagura and W. Baldini and R. J. Barlow and C. Barschel and S. Barsuk and W. Barter and Th. Bauer and A. Bay and J. Beddow and F. Bedeschi and I. Bediaga and S. Belogurov and K. Belous and I. Belyaev and E. Ben-Haim and G. Bencivenni and S. Benson and J. Benton and A. Berezhnoy and R. Bernet and M. -O. Bettler and M. van Beuzekom and A. Bien and S. Bifani and T. Bird and A. Bizzeti and P. M. Bjørnstad and T. Blake and F. Blanc and J. Blouw and S. Blusk and V. Bocci and A. Bondar and N. Bondar and W. Bonivento and S. Borghi and A. Borgia and T. J. V. Bowcock and E. Bowen and C. Bozzi and T. Brambach and J. van den Brand and J. Bressieux and D. Brett and M. Britsch and T. Britton and N. H. Brook and H. Brown and I. Burducea and A. Bursche and G. Busetto and J. Buytaert and S. Cadeddu and O. Callot and M. Calvi and M. Calvo Gomez and A. Camboni and P. Campana and D. Campora Perez and A. Carbone and G. Carboni and R. Cardinale and A. Cardini and H. Carranza-Mejia and L. Carson and K. Carvalho Akiba and G. Casse and L. Castillo Garcia and M. Cattaneo and Ch. Cauet and R. Cenci and M. Charles and Ph. Charpentier and P. Chen and N. Chiapolini and M. Chrzaszcz and K. Ciba and X. Cid Vidal and G. Ciezarek and P. E. L. Clarke and M. Clemencic and H. V. Cliff and J. Closier and C. Coca and V. Coco and J. Cogan and E. Cogneras and P. Collins and A. Comerma-Montells and A. Contu and A. Cook and M. Coombes and S. Coquereau and G. Corti and B. Couturier and G. A. Cowan and D. C. Craik and S. Cunliffe and R. Currie and C. D'Ambrosio and P. David and P. N. Y. David and A. Davis and I. De Bonis and K. De Bruyn and S. De Capua and M. De Cian and J. M. De Miranda and L. De Paula and W. De Silva and P. De Simone and D. Decamp and M. Deckenhoff and L. Del Buono and N. Déléage and D. Derkach and O. Deschamps and F. Dettori and A. Di Canto and H. Dijkstra and M. Dogaru and S. Donleavy and F. Dordei and A. Dosil Suárez and D. Dossett and A. Dovbnya and F. Dupertuis and P. Durante and R. Dzhelyadin and A. Dziurda and A. Dzyuba and S. Easo and U. Egede and V. Egorychev and S. Eidelman and D. van Eijk and S. Eisenhardt and U. Eitschberger and R. Ekelhof and L. Eklund and I. El Rifai and Ch. Elsasser and A. Falabella and C. Färber and G. Fardell and C. Farinelli and S. Farry and D. Ferguson and V. Fernandez Albor and F. Ferreira Rodrigues and M. Ferro-Luzzi and S. Filippov and M. Fiore and C. Fitzpatrick and M. Fontana and F. Fontanelli and R. Forty and O. Francisco and M. Frank and C. Frei and M. Frosini and S. Furcas and E. Furfaro and A. Gallas Torreira and D. Galli and M. Gandelman and P. Gandini and Y. Gao and J. Garofoli and P. Garosi and J. Garra Tico and L. Garrido and C. Gaspar and R. Gauld and E. Gersabeck and M. Gersabeck and T. Gershon and Ph. Ghez and V. Gibson and L. Giubega and V. V. Gligorov and C. Göbel and D. Golubkov and A. Golutvin and A. Gomes and P. Gorbounov and H. Gordon and M. Grabalosa Gándara and R. Graciani Diaz and L. A. Granado Cardoso and E. Graugés and G. Graziani and A. Grecu and E. Greening and S. Gregson and P. Griffith and O. Grünberg and B. Gui and E. Gushchin and Yu. Guz and T. Gys and C. Hadjivasiliou and G. Haefeli and C. Haen and S. C. Haines and S. Hall and B. Hamilton and T. Hampson and S. Hansmann-Menzemer and N. Harnew and S. T. Harnew and J. Harrison and T. Hartmann and J. He and T. Head and V. Heijne and K. Hennessy and P. Henrard and J. A. Hernando Morata and E. van Herwijnen and A. Hicheur and E. Hicks and D. Hill and M. Hoballah and C. Hombach and P. Hopchev and W. Hulsbergen and P. Hunt and T. Huse and N. Hussain and D. Hutchcroft and D. Hynds and V. Iakovenko and M. Idzik and P. Ilten and R. Jacobsson and A. Jaeger and E. Jans and P. Jaton and A. Jawahery and F. Jing and M. John and D. Johnson and C. R. Jones and C. Joram and B. Jost and M. Kaballo and S. Kandybei and W. Kanso and M. Karacson and T. M. Karbach and I. R. Kenyon and T. Ketel and A. Keune and B. Khanji and O. Kochebina and I. Komarov and R. F. Koopman and P. Koppenburg and M. Korolev and A. Kozlinskiy and L. Kravchuk and K. Kreplin and M. Kreps and G. Krocker and P. Krokovny and F. Kruse and M. Kucharczyk and V. Kudryavtsev and T. Kvaratskheliya and V. N. La Thi and D. Lacarrere and G. Lafferty and A. Lai and D. Lambert and R. W. Lambert and E. Lanciotti and G. Lanfranchi and C. Langenbruch and T. Latham and C. Lazzeroni and R. Le Gac and J. van Leerdam and J. -P. Lees and R. Lefèvre and A. Leflat and J. Lefrançois and S. Leo and O. Leroy and T. Lesiak and B. Leverington and Y. Li and L. Li Gioi and M. Liles and R. Lindner and C. Linn and B. Liu and G. Liu and S. Lohn and I. Longstaff and J. H. Lopes and N. Lopez-March and H. Lu and D. Lucchesi and J. Luisier and H. Luo and F. Machefert and I. V. Machikhiliyan and F. Maciuc and O. Maev and S. Malde and G. Manca and G. Mancinelli and J. Maratas and U. Marconi and P. Marino and R. Märki and J. Marks and G. Martellotti and A. Martens and A. Martín Sánchez and M. Martinelli and D. Martinez Santos and D. Martins Tostes and A. Massafferri and R. Matev and Z. Mathe and C. Matteuzzi and E. Maurice and A. Mazurov and B. Mc Skelly and J. McCarthy and A. McNab and R. McNulty and B. Meadows and F. Meier and M. Meissner and M. Merk and D. A. Milanes and M. -N. Minard and J. Molina Rodriguez and S. Monteil and D. Moran and P. Morawski and A. Mordà and M. J. Morello and R. Mountain and I. Mous and F. Muheim and K. Müller and R. Muresan and B. Muryn and B. Muster and P. Naik and T. Nakada and R. Nandakumar and I. Nasteva and M. Needham and S. Neubert and N. Neufeld and A. D. Nguyen and T. D. Nguyen and C. Nguyen-Mau and M. Nicol and V. Niess and R. Niet and N. Nikitin and T. Nikodem and A. Nomerotski and A. Novoselov and A. Oblakowska-Mucha and V. Obraztsov and S. Oggero and S. Ogilvy and O. Okhrimenko and R. Oldeman and M. Orlandea and J. M. Otalora Goicochea and P. Owen and A. Oyanguren and B. K. Pal and A. Palano and T. Palczewski and M. Palutan and J. Panman and A. Papanestis and M. Pappagallo and C. Parkes and C. J. Parkinson and G. Passaleva and G. D. Patel and M. Patel and G. N. Patrick and C. Patrignani and C. Pavel-Nicorescu and A. Pazos Alvarez and A. Pellegrino and G. Penso and M. Pepe Altarelli and S. Perazzini and E. Perez Trigo and A. Pérez-Calero Yzquierdo and P. Perret and M. Perrin-Terrin and L. Pescatore and E. Pesen and G. Pessina and K. Petridis and A. Petrolini and A. Phan and E. Picatoste Olloqui and B. Pietrzyk and T. Pilař and D. Pinci and S. Playfer and M. Plo Casasus and F. Polci and G. Polok and A. Poluektov and E. Polycarpo and A. Popov and D. Popov and B. Popovici and C. Potterat and A. Powell and J. Prisciandaro and A. Pritchard and C. Prouve and V. Pugatch and A. Puig Navarro and G. Punzi and W. Qian and J. H. Rademacker and B. Rakotomiaramanana and M. S. Rangel and I. Raniuk and N. Rauschmayr and G. Raven and S. Redford and M. M. Reid and A. C. dos Reis and S. Ricciardi and A. Richards and K. Rinnert and V. Rives Molina and D. A. Roa Romero and P. Robbe and D. A. Roberts and E. Rodrigues and P. Rodriguez Perez and S. Roiser and V. Romanovsky and A. Romero Vidal and J. Rouvinet and T. Ruf and F. Ruffini and H. Ruiz and P. Ruiz Valls and G. Sabatino and J. J. Saborido Silva and N. Sagidova and P. Sail and B. Saitta and V. Salustino Guimaraes and B. Sanmartin Sedes and M. Sannino and R. Santacesaria and C. Santamarina Rios and E. Santovetti and M. Sapunov and A. Sarti and C. Satriano and A. Satta and M. Savrie and D. Savrina and P. Schaack and M. Schiller and H. Schindler and M. Schlupp and M. Schmelling and B. Schmidt and O. Schneider and A. Schopper and M. -H. Schune and R. Schwemmer and B. Sciascia and A. Sciubba and M. Seco and A. Semennikov and K. Senderowska and I. Sepp and N. Serra and J. Serrano and P. Seyfert and M. Shapkin and I. Shapoval and P. Shatalov and Y. Shcheglov and T. Shears and L. Shekhtman and O. Shevchenko and V. Shevchenko and A. Shires and R. Silva Coutinho and M. Sirendi and T. Skwarnicki and N. A. Smith and E. Smith and J. Smith and M. Smith and M. D. Sokoloff and F. J. P. Soler and F. Soomro and D. Souza and B. Souza De Paula and B. Spaan and A. Sparkes and P. Spradlin and F. Stagni and S. Stahl and O. Steinkamp and S. Stevenson and S. Stoica and S. Stone and B. Storaci and M. Straticiuc and U. Straumann and V. K. Subbiah and L. Sun and S. Swientek and V. Syropoulos and M. Szczekowski and P. Szczypka and T. Szumlak and S. T'Jampens and M. Teklishyn and E. Teodorescu and F. Teubert and C. Thomas and E. Thomas and J. van Tilburg and V. Tisserand and M. Tobin and S. Tolk and D. Tonelli and S. Topp-Joergensen and N. Torr and E. Tournefier and S. Tourneur and M. T. Tran and M. Tresch and A. Tsaregorodtsev and P. Tsopelas and N. Tuning and M. Ubeda Garcia and A. Ukleja and D. Urner and A. Ustyuzhanin and U. Uwer and V. Vagnoni and G. Valenti and A. Vallier and M. Van Dijk and R. Vazquez Gomez and P. Vazquez Regueiro and C. Vázquez Sierra and S. Vecchi and J. J. Velthuis and M. Veltri and G. Veneziano and M. Vesterinen and B. Viaud and D. Vieira and X. Vilasis-Cardona and A. Vollhardt and D. Volyanskyy and D. Voong and A. Vorobyev and V. Vorobyev and C. Voß and H. Voss and R. Waldi and C. Wallace and R. Wallace and S. Wandernoth and J. Wang and D. R. Ward and N. K. Watson and A. D. Webber and D. Websdale and M. Whitehead and J. Wicht and J. Wiechczynski and D. Wiedner and L. Wiggers and G. Wilkinson and M. P. Williams and M. Williams and F. F. Wilson and J. Wimberley and J. Wishahi and W. Wislicki and M. Witek and S. A. Wotton and S. Wright and S. Wu and K. Wyllie and Y. Xie and Z. Xing and Z. Yang and R. Young and X. Yuan and O. Yushchenko and M. Zangoli and M. Zavertyaev and F. Zhang and L. Zhang and W. C. Zhang and Y. Zhang and A. Zhelezov and A. Zhokhov and L. Zhong and A. Zvyagin},
journal= {arXiv preprint arXiv:1307.2476},
year = {2016}
}
Comments
11 pages 6 figures, v2 minor corrections