Display options
Share it on

Phys Rev Lett. 2014 Jul 18;113(3):032001. doi: 10.1103/PhysRevLett.113.032001. Epub 2014 Jul 15.

Precision measurement of the mass and lifetime of the Ξ(b)(0) baryon.

Physical review letters

R Aaij, B Adeva, M Adinolfi, A Affolder, Z Ajaltouni, S Akar, J Albrecht, F Alessio, M Alexander, S Ali, G Alkhazov, P Alvarez Cartelle, A A Alves, S Amato, S Amerio, Y Amhis, L An, L Anderlini, J Anderson, R Andreassen, M Andreotti, J E Andrews, R B Appleby, O Aquines Gutierrez, F Archilli, A Artamonov, M Artuso, E Aslanides, G Auriemma, M Baalouch, S Bachmann, J J Back, A Badalov, V Balagura, W Baldini, R J Barlow, C Barschel, S Barsuk, W Barter, V Batozskaya, V Battista, A Bay, L Beaucourt, J Beddow, F Bedeschi, I Bediaga, S Belogurov, K Belous, I Belyaev, E Ben-Haim, 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, J Blouw, S Blusk, V Bocci, A Bondar, N Bondar, W Bonivento, S Borghi, A Borgia, M Borsato, T J V Bowcock, E Bowen, C Bozzi, T Brambach, J van den Brand, J Bressieux, D Brett, M Britsch, T Britton, J Brodzicka, N H Brook, H Brown, A Bursche, G Busetto, J Buytaert, S Cadeddu, R Calabrese, M Calvi, M Calvo Gomez, A Camboni, P Campana, D Campora Perez, A Carbone, G Carboni, R Cardinale, A Cardini, H Carranza-Mejia, L Carson, K Carvalho Akiba, G Casse, L Cassina, L Castillo Garcia, M Cattaneo, Ch Cauet, R Cenci, M Charles, Ph Charpentier, S Chen, S-F Cheung, N Chiapolini, M Chrzaszcz, K Ciba, X Cid Vidal, G Ciezarek, P E L Clarke, M Clemencic, H V Cliff, J Closier, V Coco, J Cogan, E Cogneras, P Collins, A Comerma-Montells, A Contu, A Cook, M Coombes, S Coquereau, G Corti, M Corvo, I Counts, B Couturier, G A Cowan, D C Craik, M Cruz Torres, S Cunliffe, R Currie, C D'Ambrosio, J Dalseno, P David, P N Y David, A Davis, K De Bruyn, S De Capua, M De Cian, J M De Miranda, L De Paula, W De Silva, P De Simone, D Decamp, M Deckenhoff, L Del Buono, N Déléage, D Derkach, O Deschamps, F Dettori, A Di Canto, H Dijkstra, S Donleavy, F Dordei, M Dorigo, A Dosil Suárez, D Dossett, A Dovbnya, K Dreimanis, G Dujany, F Dupertuis, P Durante, R Dzhelyadin, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, U Eitschberger, R Ekelhof, L Eklund, I El Rifai, Ch Elsasser, S Ely, S Esen, H-M Evans, T Evans, A Falabella, C Färber, C Farinelli, N Farley, S Farry, D Ferguson, V Fernandez Albor, F Ferreira Rodrigues, M Ferro-Luzzi, S Filippov, M Fiore, M Fiorini, M Firlej, C Fitzpatrick, T Fiutowski, M Fontana, F Fontanelli, R Forty, O Francisco, M Frank, C Frei, M Frosini, J Fu, E Furfaro, A Gallas Torreira, D Galli, S Gallorini, S Gambetta, M Gandelman, P Gandini, Y Gao, J Garofoli, J Garra Tico, L Garrido, C Gaspar, R Gauld, L Gavardi, G Gavrilov, E Gersabeck, M Gersabeck, T Gershon, Ph Ghez, A Gianelle, S Giani', V Gibson, L Giubega, 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, E Greening, S Gregson, P Griffith, L Grillo, O Grünberg, B Gui, E Gushchin, Yu Guz, T Gys, C Hadjivasiliou, G Haefeli, C Haen, S C Haines, S Hall, B Hamilton, T Hampson, X Han, S Hansmann-Menzemer, N Harnew, S T Harnew, J Harrison, T Hartmann, J He, T Head, V Heijne, K Hennessy, P Henrard, L Henry, J A Hernando Morata, E van Herwijnen, M Heß, A Hicheur, D Hill, M Hoballah, C Hombach, W Hulsbergen, P Hunt, N Hussain, D Hutchcroft, D Hynds, M Idzik, P Ilten, R Jacobsson, A Jaeger, J Jalocha, E Jans, P Jaton, A Jawahery, F Jing, M John, D Johnson, C R Jones, C Joram, B Jost, N Jurik, M Kaballo, S Kandybei, W Kanso, M Karacson, T M Karbach, S Karodia, M Kelsey, I R Kenyon, T Ketel, B Khanji, C Khurewathanakul, S Klaver, O Kochebina, M Kolpin, I Komarov, R F Koopman, P Koppenburg, M Korolev, A Kozlinskiy, L Kravchuk, K Kreplin, M Kreps, G Krocker, P Krokovny, F Kruse, W Kucewicz, M Kucharczyk, V Kudryavtsev, K Kurek, T Kvaratskheliya, V N La Thi, D Lacarrere, G Lafferty, A Lai, D Lambert, R W Lambert, E Lanciotti, G Lanfranchi, C Langenbruch, B Langhans, T Latham, C Lazzeroni, R Le Gac, J van Leerdam, J-P Lees, R Lefèvre, A Leflat, J Lefrançois, S Leo, O Leroy, T Lesiak, B Leverington, Y Li, M Liles, R Lindner, C Linn, F Lionetto, B Liu, G Liu, S Lohn, I Longstaff, J H Lopes, N Lopez-March, P Lowdon, H Lu, D Lucchesi, H Luo, A Lupato, E Luppi, O Lupton, F Machefert, I V Machikhiliyan, F Maciuc, O Maev, S Malde, G Manca, G Mancinelli, J Maratas, J F Marchand, U Marconi, C Marin Benito, P Marino, R Märki, J Marks, G Martellotti, A Martens, A Martín Sánchez, M Martinelli, D Martinez Santos, F Martinez Vidal, D Martins Tostes, A Massafferri, R Matev, Z Mathe, C Matteuzzi, A Mazurov, M McCann, J McCarthy, A McNab, R McNulty, B McSkelly, B Meadows, F Meier, M Meissner, M Merk, D A Milanes, M-N Minard, N Moggi, J Molina Rodriguez, S Monteil, M Morandin, P Morawski, A Mordà, M J Morello, J Moron, A-B Morris, R Mountain, F Muheim, K Müller, R Muresan, M Mussini, B Muster, P Naik, T Nakada, R Nandakumar, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, M Neuner, A D Nguyen, T D Nguyen, C Nguyen-Mau, M Nicol, V Niess, R Niet, N Nikitin, T Nikodem, A Novoselov, D P O'Hanlon, A Oblakowska-Mucha, V Obraztsov, S Oggero, S Ogilvy, O Okhrimenko, R Oldeman, G Onderwater, M Orlandea, J M Otalora Goicochea, P Owen, A Oyanguren, B K Pal, A Palano, F Palombo, M Palutan, J Panman, A Papanestis, M Pappagallo, C Parkes, C J Parkinson, G Passaleva, G D Patel, M Patel, C Patrignani, A Pazos Alvarez, A Pearce, A Pellegrino, M Pepe Altarelli, S Perazzini, E Perez Trigo, P Perret, M Perrin-Terrin, L Pescatore, E Pesen, K Petridis, A Petrolini, E Picatoste Olloqui, B Pietrzyk, T Pilař, D Pinci, A Pistone, S Playfer, M Plo Casasus, F Polci, A Poluektov, E Polycarpo, A Popov, D Popov, B Popovici, C Potterat, E Price, J Prisciandaro, A Pritchard, C Prouve, V Pugatch, A Puig Navarro, G Punzi, W Qian, B Rachwal, J H Rademacker, B Rakotomiaramanana, M Rama, M S Rangel, I Raniuk, N Rauschmayr, G Raven, S Reichert, M M Reid, A C Dos Reis, S Ricciardi, S Richards, M Rihl, K Rinnert, V Rives Molina, D A Roa Romero, P Robbe, A B Rodrigues, E Rodrigues, P Rodriguez Perez, S Roiser, V Romanovsky, A Romero Vidal, M Rotondo, J Rouvinet, T Ruf, F Ruffini, H Ruiz, P Ruiz Valls, G Sabatino, J J Saborido Silva, N Sagidova, P Sail, B Saitta, V Salustino Guimaraes, C Sanchez Mayordomo, B Sanmartin Sedes, R Santacesaria, C Santamarina Rios, E Santovetti, M Sapunov, A Sarti, C Satriano, A Satta, D M Saunders, M Savrie, D Savrina, M Schiller, H Schindler, M Schlupp, M Schmelling, B Schmidt, O Schneider, A Schopper, M-H Schune, R Schwemmer, B Sciascia, A Sciubba, M Seco, A Semennikov, I Sepp, N Serra, J Serrano, L Sestini, P Seyfert, M Shapkin, I Shapoval, Y Shcheglov, T Shears, L Shekhtman, V Shevchenko, A Shires, R Silva Coutinho, G Simi, M Sirendi, N Skidmore, T Skwarnicki, N A Smith, E Smith, E Smith, J Smith, M Smith, H Snoek, M D Sokoloff, F J P Soler, F Soomro, D Souza, B Souza De Paula, B Spaan, A Sparkes, P Spradlin, F Stagni, M Stahl, S Stahl, O Steinkamp, O Stenyakin, S Stevenson, S Stoica, S Stone, B Storaci, S Stracka, M Straticiuc, U Straumann, R Stroili, V K Subbiah, L Sun, W Sutcliffe, K Swientek, S Swientek, V Syropoulos, M Szczekowski, P Szczypka, D Szilard, T Szumlak, S T'Jampens, M Teklishyn, G Tellarini, F Teubert, C Thomas, E Thomas, J van Tilburg, V Tisserand, M Tobin, S Tolk, L Tomassetti, D Tonelli, S Topp-Joergensen, N Torr, E Tournefier, S Tourneur, M T Tran, M Tresch, A Tsaregorodtsev, P Tsopelas, N Tuning, M Ubeda Garcia, A Ukleja, A Ustyuzhanin, U Uwer, V Vagnoni, G Valenti, A Vallier, R Vazquez Gomez, P Vazquez Regueiro, C Vázquez Sierra, S Vecchi, J J Velthuis, M Veltri, G Veneziano, M Vesterinen, B Viaud, D Vieira, M Vieites Diaz, X Vilasis-Cardona, A Vollhardt, D Volyanskyy, D Voong, A Vorobyev, V Vorobyev, C Voß, H Voss, J A de Vries, R Waldi, C Wallace, R Wallace, J Walsh, S Wandernoth, J Wang, D R Ward, N K Watson, D Websdale, M Whitehead, J Wicht, D Wiedner, G Wilkinson, M P Williams, M Williams, F F Wilson, J Wimberley, J Wishahi, W Wislicki, M Witek, G Wormser, S A Wotton, S Wright, S Wu, K Wyllie, Y Xie, Z Xing, Z Xu, Z Yang, X Yuan, O Yushchenko, M Zangoli, M Zavertyaev, L Zhang, W C Zhang, Y Zhang, A Zhelezov, A Zhokhov, L Zhong, A Zvyagin,

Affiliations

  1. Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
  2. Universidad de Santiago de Compostela, Santiago de Compostela, Spain.
  3. H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
  4. Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
  5. Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
  6. CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
  7. Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
  8. European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  9. School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
  10. Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
  11. Sezione INFN di Roma La Sapienza, Roma, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  12. Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
  13. Sezione INFN di Padova, Padova, Italy.
  14. LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
  15. Center for High Energy Physics, Tsinghua University, Beijing, China.
  16. Sezione INFN di Firenze, Firenze, Italy.
  17. Physik-Institut, Universität Zürich, Zürich, Switzerland.
  18. University of Cincinnati, Cincinnati, Ohio, USA.
  19. Sezione INFN di Ferrara, Ferrara, Italy.
  20. University of Maryland, College Park, Maryland, USA.
  21. School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
  22. Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
  23. Institute for High Energy Physics (IHEP), Protvino, Russia.
  24. Syracuse University, Syracuse, New York, USA.
  25. Sezione INFN di Roma La Sapienza, Roma, Italy.
  26. Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
  27. Department of Physics, University of Warwick, Coventry, United Kingdom.
  28. Universitat de Barcelona, Barcelona, Spain.
  29. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
  30. Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
  31. National Center for Nuclear Research (NCBJ), Warsaw, Poland.
  32. Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  33. LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France.
  34. Sezione INFN di Pisa, Pisa, Italy.
  35. Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
  36. LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
  37. Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
  38. Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
  39. University of Birmingham, Birmingham, United Kingdom.
  40. Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
  41. Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  42. Sezione INFN di Cagliari, Cagliari, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  43. Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
  44. Sezione INFN di Cagliari, Cagliari, Italy.
  45. Sezione INFN di Milano Bicocca, Milano, Italy.
  46. Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  47. Sezione INFN di Bologna, Bologna, Italy.
  48. Sezione INFN di Roma Tor Vergata, Roma, Italy.
  49. Sezione INFN di Genova, Genova, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  50. School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
  51. Department of Physics, University of Oxford, Oxford, United Kingdom.
  52. Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and Physik-Institut, Universität Zürich, Zürich, Switzerland.
  53. Imperial College London, London, United Kingdom.
  54. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
  55. Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil (associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil).
  56. NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
  57. Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
  58. European Organization for Nuclear Research (CERN), Geneva, Switzerland and STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
  59. European Organization for Nuclear Research (CERN), Geneva, Switzerland and School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
  60. Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
  61. AGH-University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
  62. Sezione INFN di Genova, Genova, Italy.
  63. Sezione INFN di Firenze, Firenze, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  64. Sezione INFN di Milano, Milano, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  65. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
  66. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland and Imperial College London, London, United Kingdom.
  67. Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
  68. Institute for High Energy Physics (IHEP), Protvino, Russia and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  69. European Organization for Nuclear Research (CERN), Geneva, Switzerland and Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands.
  70. Sezione INFN di Milano Bicocca, Milano, Italy and Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  71. Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain (associated with Institution Universitat de Barcelona, Barcelona, Spain).
  72. School of Physics, University College Dublin, Dublin, Ireland.
  73. STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
  74. Sezione INFN di Milano, Milano, Italy.
  75. Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
  76. KVI-University of Groningen, Groningen, The Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands).
  77. Sezione INFN di Bari, Bari, Italy.
  78. Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany and University of Birmingham, Birmingham, United Kingdom.
  79. Celal Bayar University, Manisa, Turkey (associated with Institution European Organization for Nuclear Research (CERN), Geneva, Switzerland).
  80. Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia and Department of Physics, University of Warwick, Coventry, United Kingdom.
  81. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia and Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
  82. Sezione INFN di Ferrara, Ferrara, Italy and NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
  83. National Research Centre Kurchatov Institute, Moscow, Russia (associated with Institution Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia).
  84. STFC Rutherford Appleton Laboratory, Didcot, United Kingdom and Department of Physics, University of Oxford, Oxford, United Kingdom.
  85. Sezione INFN di Pisa, Pisa, Italy and European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  86. European Organization for Nuclear Research (CERN), Geneva, Switzerland and Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  87. Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).

PMID: 25083633 DOI: 10.1103/PhysRevLett.113.032001

Abstract

Using a proton-proton collision data sample corresponding to an integrated luminosity of 3 fb(-1) collected by LHCb at center-of-mass energies of 7 and 8 TeV, about 3800 Ξ(b)(0) → Ξ(c)(+)π(-), Ξ(c)(+)) → pK(-)π(+) signal decays are reconstructed. From this sample, the first measurement of the Ξ(b)(0) baryon lifetime is made, relative to that of the Λ(b)(0) baryon. The mass differences M(Ξ(b)(0))-M(Λ(b)(0)) and M(Ξ(c)(+))-M(Λ(c)(+)) are also measured with precision more than 4 times better than the current world averages. The resulting values are τ(Ξ(b)(0))/τ(Λ)(b)(0)) = 1.006 ± 0.018 ± 0.010,M(Ξ(b)(0))-M(Λ(b)(0)) = 172.44 ± 0.39 ± 0.17 MeV/c(2),M(Ξ(c)(+))-M(Λ(c)(+)) = 181.51 ± 0.14 ± 0.10 MeV/c(2),where the first uncertainty is statistical and the second is systematic. The relative rate of Ξ(b)(0) to Λ(b)(0) baryon production is measured to be f(Ξ)(b)(0))/f(Λ)(b)(0))B(Ξ(b)(0) → Ξ(c)(+)π(-))/B(Λ(b)(0) → Λ(c)(+)π(-))B(Ξ(c)(+) → pK(-)π(+))/B(Λ(c)(+) → pK(-)}π(+)) = (1.88 ± 0.04 ± 0.03) × 10(-2),where the first factor is the ratio of fragmentation fractions, b → Ξ(b)(0) relative to b → Λ(b)(0). Relative production rates as functions of transverse momentum and pseudorapidity are also presented.

Publication Types