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Eur Phys J C Part Fields. 2014;74(5):2888. doi: 10.1140/epjc/s10052-014-2888-1. Epub 2014 May 24.

Measurement of charged particle multiplicities and densities in [Formula: see text] collisions at [Formula: see text]TeV in the forward region.

The European physical journal. C, Particles and fields

R Aaij, B Adeva, M Adinolfi, A Affolder, Z Ajaltouni, J Albrecht, F Alessio, M Alexander, S Ali, G Alkhazov, P Alvarez Cartelle, A A Alves, S Amato, S Amerio, Y Amhis, 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, Th Bauer, A Bay, 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 Vanden Brand, J Bressieux, D Brett, M Britsch, T Britton, N H Brook, H Brown, A Bursche, G Busetto, J Buytaert, S Cadeddu, R Calabrese, O Callot, 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-F Cheung, N Chiapolini, M Chrzaszcz, K Ciba, X Cid Vidal, G Ciezarek, P E L Clarke, M Clemencic, H V Cliff, J Closier, C Coca, V Coco, J Cogan, E Cogneras, P Collins, A Comerma-Montells, A Contu, A Cook, M Coombes, S Coquereau, G Corti, 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, I De Bonis, 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, P Dorosz, A Dosil Suárez, D Dossett, A Dovbnya, 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 Esen, A Falabella, C Färber, C Farinelli, S Farry, D Ferguson, V Fernandez Albor, F Ferreira Rodrigues, M Ferro-Luzzi, S Filippov, M Fiore, M Fiorini, C Fitzpatrick, M Fontana, F Fontanelli, R Forty, O Francisco, M Frank, C Frei, M Frosini, J Fu, E Furfaro, A Gallas Torreira, D Galli, M Gandelman, P Gandini, Y Gao, J Garofoli, J Garra Tico, L Garrido, C Gaspar, R Gauld, L Gavardi, 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, 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, T W Hafkenscheid, S C Haines, S Hall, B Hamilton, T Hampson, 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, V Iakovenko, M Idzik, P Ilten, R Jacobsson, A Jaeger, 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, M Kelsey, I R Kenyon, T Ketel, B Khanji, C Khurewathanakul, S Klaver, O Kochebina, I Komarov, R F Koopman, P Koppenburg, M Korolev, A Kozlinskiy, L Kravchuk, K Kreplin, M Kreps, G Krocker, P Krokovny, F Kruse, 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, 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, J Luisier, H Luo, E Luppi, O Lupton, F Machefert, I V Machikhiliyan, F Maciuc, O Maev, S Malde, G Manca, G Mancinelli, M Manzali, J Maratas, U Marconi, 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, J Molina Rodriguez, S Monteil, D Moran, M Morandin, P Morawski, A Mordà, M J Morello, R Mountain, F Muheim, K Müller, R Muresan, B Muryn, B Muster, P Naik, T Nakada, R Nandakumar, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, A D Nguyen, T D Nguyen, C Nguyen-Mau, M Nicol, V Niess, R Niet, N Nikitin, T Nikodem, A Novoselov, 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, L Pappalardo, C Parkes, C J Parkinson, G Passaleva, G D Patel, M Patel, C Patrignani, C Pavel-Nicorescu, A Pazos Alvarez, A Pearce, A Pellegrino, G Penso, M Pepe Altarelli, S Perazzini, E Perez Trigo, P Perret, M Perrin-Terrin, L Pescatore, E Pesen, G Pessina, K Petridis, A Petrolini, E Picatoste Olloqui, B Pietrzyk, T Pilař, D Pinci, A Pistone, S Playfer, M Plo Casasus, F Polci, G Polok, A Poluektov, E Polycarpo, A Popov, D Popov, B Popovici, C Potterat, A Powell, 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 Redford, S Reichert, M M Reid, A C Dos Reis, S Ricciardi, A Richards, K Rinnert, V Rives Molina, D A Roa Romero, P Robbe, D A Roberts, 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, B Sanmartin Sedes, R Santacesaria, C Santamarina Rios, E Santovetti, M Sapunov, A Sarti, C Satriano, A Satta, 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, K Senderowska, I Sepp, N Serra, J Serrano, P Seyfert, M Shapkin, I Shapoval, Y Shcheglov, T Shears, L Shekhtman, O Shevchenko, 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, F Spinella, P Spradlin, F Stagni, S Stahl, O Steinkamp, S Stevenson, S Stoica, S Stone, B Storaci, S Stracka, M Straticiuc, U Straumann, R Stroili, V K Subbiah, L Sun, W Sutcliffe, S Swientek, V Syropoulos, M Szczekowski, P Szczypka, D Szilard, T Szumlak, S T'Jampens, M Teklishyn, G Tellarini, E Teodorescu, 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, 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, S Wandernoth, J Wang, D R Ward, N K Watson, A D Webber, D Websdale, M Whitehead, J Wicht, J Wiechczynski, D Wiedner, L Wiggers, 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 Yang, X Yuan, O Yushchenko, M Zangoli, M Zavertyaev, F Zhang, 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, UK.
  4. Oliver Lodge Laboratory, University of Liverpool, Liverpool, UK.
  5. Clermont Université, Université Blaise Pascal, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
  6. Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
  7. European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  8. School of Physics and Astronomy, University of Glasgow, Glasgow, UK.
  9. Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia.
  10. Sezione INFN di Roma La Sapienza, Rome, Italy.
  11. Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
  12. Sezione INFN di Padova, Padua, Italy.
  13. LAL, Université Paris-Sud, CNRS/IN2P3, Orsay, France.
  14. Sezione INFN di Firenze, Firenze, Italy.
  15. Physik-Institut, Universität Zürich, Zürich, Switzerland.
  16. University of Cincinnati, Cincinnati, OH USA.
  17. Sezione INFN di Ferrara, Ferrara, Italy.
  18. University of Maryland, College Park, MD USA.
  19. School of Physics and Astronomy, University of Manchester, Manchester, UK.
  20. Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
  21. Institute for High Energy Physics (IHEP), Protvino, Russia.
  22. Syracuse University, Syracuse, NY United States.
  23. CPPM, Aix-Marseille Université, CNRS/IN2P3, Marseille, France.
  24. Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
  25. Department of Physics, University of Warwick, Coventry, UK.
  26. Universitat de Barcelona, Barcelona, Spain.
  27. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia.
  28. Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  29. Cavendish Laboratory, University of Cambridge, Cambridge, UK.
  30. National Center for Nuclear Research (NCBJ), Warsaw, Poland.
  31. Sezione INFN di Pisa, Pisa, Italy.
  32. Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
  33. LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France.
  34. Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy.
  35. School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.
  36. Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
  37. University of Birmingham, Birmingham, UK.
  38. Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia.
  39. Sezione INFN di Cagliari, Cagliari, Italy ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  40. Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, The Netherlands.
  41. Sezione INFN di Cagliari, Cagliari, Italy.
  42. Sezione INFN di Milano Bicocca, Milano, Italy.
  43. Laboratori Nazionali dell'INFN di Frascati, Frascati, Italy ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  44. Sezione INFN di Bologna, Bologna, Italy.
  45. Sezione INFN di Roma Tor Vergata, Rome, Italy.
  46. Sezione INFN di Genova, Genova, Italy.
  47. Department of Physics, University of Oxford, Oxford, UK.
  48. Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland ; Physik-Institut, Universität Zürich, Zürich, Switzerland.
  49. Imperial College London, London, UK.
  50. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
  51. Massachusetts Institute of Technology, Cambridge, MA USA.
  52. Pontifícia Universidade Católica do Rio de Janeiro (PUC-Rio), Rio de Janeiro, Brazil.
  53. LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France.
  54. Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
  55. NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
  56. STFC Rutherford Appleton Laboratory, Didcot, UK.
  57. European Organization for Nuclear Research (CERN), Geneva, Switzerland ; School of Physics and Astronomy, University of Glasgow, Glasgow, UK.
  58. Institute for Nuclear Research of the Russian Academy of Sciences (INR RAN), Moscow, Russia.
  59. Sezione INFN di Firenze, Firenze, Italy ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  60. Sezione INFN di Milano, Milano, Italy.
  61. Center for High Energy Physics, Tsinghua University, Beijing, China.
  62. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia ; European Organization for Nuclear Research (CERN), Geneva, Switzerland ; Imperial College London, London, UK.
  63. Institut für Physik, Universität Rostock, Rostock, Germany.
  64. Institute for High Energy Physics (IHEP), Protvino, Russia ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  65. KVI-University of Groningen, Groningen, The Netherlands.
  66. Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
  67. Faculty of Physics and Applied Computer Science, AGH-University of Science and Technology, Kraków, Poland.
  68. Sezione INFN di Milano Bicocca, Milano, Italy ; Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  69. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  70. Petersburg Nuclear Physics Institute (PNPI), Gatchina, Russia ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  71. Instituto de Fisica Corpuscular (IFIC), Universitat de Valencia-CSIC, Valencia, Spain.
  72. Sezione INFN di Ferrara, Ferrara, Italy ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  73. School of Physics, University College Dublin, Dublin, Ireland.
  74. Department of Physics, University of Oxford, Oxford, UK ; University of Cincinnati, Cincinnati, OH USA.
  75. Sezione INFN di Bari, Bari, Italy.
  76. European Organization for Nuclear Research (CERN), Geneva, Switzerland ; STFC Rutherford Appleton Laboratory, Didcot, UK.
  77. Celal Bayar University, Manisa, Turkey.
  78. Budker Institute of Nuclear Physics (SB RAS) and Novosibirsk State University, Novosibirsk, Russia ; Department of Physics, University of Warwick, Coventry, UK.
  79. Sezione INFN di Roma La Sapienza, Rome, Italy ; Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
  80. Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia ; Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
  81. Sezione INFN di Ferrara, Ferrara, Italy ; NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
  82. National Research Centre Kurchatov Institute, Moscow, Russia.
  83. STFC Rutherford Appleton Laboratory, Didcot, UK ; Department of Physics, University of Oxford, Oxford, UK.
  84. Sezione INFN di Pisa, Pisa, Italy ; European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  85. European Organization for Nuclear Research (CERN), Geneva, Switzerland ; Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  86. LAPP, Université de Savoie, CNRS/IN2P3, Annecy-Le-Vieux, France ; Imperial College London, London, UK.
  87. Department of Physics, University of Warwick, Coventry, UK ; STFC Rutherford Appleton Laboratory, Didcot, UK.
  88. European Organization for Nuclear Research (CERN), Geneva, Switzerland ; School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.

PMID: 25814891 PMCID: PMC4371048 DOI: 10.1140/epjc/s10052-014-2888-1

Abstract

Charged particle multiplicities are studied in proton-proton collisions in the forward region at a centre-of-mass energy of [Formula: see text]TeV with data collected by the LHCb detector. The forward spectrometer allows access to a kinematic range of [Formula: see text] in pseudorapidity, momenta greater than [Formula: see text] and transverse momenta greater than [Formula: see text]. The measurements are performed using events with at least one charged particle in the kinematic acceptance. The results are presented as functions of pseudorapidity and transverse momentum and are compared to predictions from several Monte Carlo event generators.

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