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Phys Rev Lett. 2019 May 17;122(19):191801. doi: 10.1103/PhysRevLett.122.191801.

Search for Lepton-Universality Violation in B^{+}→K^{+}ℓ^{+}ℓ^{-} Decays.

Physical review letters

R Aaij, C Abellán Beteta, B Adeva, M Adinolfi, C A Aidala, Z Ajaltouni, S Akar, P Albicocco, J Albrecht, F Alessio, M Alexander, A Alfonso Albero, G Alkhazov, P Alvarez Cartelle, A A Alves, S Amato, Y Amhis, L An, L Anderlini, G Andreassi, M Andreotti, J E Andrews, F Archilli, J Arnau Romeu, A Artamonov, M Artuso, K Arzymatov, E Aslanides, M Atzeni, B Audurier, S Bachmann, J J Back, S Baker, V Balagura, W Baldini, A Baranov, R J Barlow, S Barsuk, W Barter, M Bartolini, F Baryshnikov, V Batozskaya, B Batsukh, A Battig, V Battista, A Bay, F Bedeschi, I Bediaga, A Beiter, L J Bel, S Belin, N Beliy, V Bellee, N Belloli, K Belous, I Belyaev, G Bencivenni, E Ben-Haim, S Benson, S Beranek, A Berezhnoy, R Bernet, D Berninghoff, E Bertholet, A Bertolin, C Betancourt, F Betti, M O Bettler, Ia Bezshyiko, S Bhasin, J Bhom, M S Bieker, S Bifani, P Billoir, A Birnkraut, A Bizzeti, M Bjørn, M P Blago, T Blake, F Blanc, S Blusk, D Bobulska, V Bocci, O Boente Garcia, T Boettcher, A Bondar, N Bondar, S Borghi, M Borisyak, M Borsato, M Boubdir, T J V Bowcock, C Bozzi, S Braun, M Brodski, J Brodzicka, A Brossa Gonzalo, D Brundu, E Buchanan, A Buonaura, C Burr, A Bursche, J Butter, J Buytaert, W Byczynski, S Cadeddu, H Cai, R Calabrese, S Cali, R Calladine, M Calvi, M Calvo Gomez, A Camboni, P Campana, D H Campora Perez, L Capriotti, A Carbone, G Carboni, R Cardinale, A Cardini, P Carniti, K Carvalho Akiba, G Casse, M Cattaneo, G Cavallero, R Cenci, M G Chapman, M Charles, Ph Charpentier, G Chatzikonstantinidis, M Chefdeville, V Chekalina, C Chen, S Chen, S-G Chitic, V Chobanova, M Chrzaszcz, A Chubykin, P Ciambrone, X Cid Vidal, G Ciezarek, F Cindolo, P E L Clarke, M Clemencic, H V Cliff, J Closier, V Coco, J A B Coelho, J Cogan, E Cogneras, L Cojocariu, P Collins, T Colombo, A Comerma-Montells, A Contu, G Coombs, S Coquereau, G Corti, C M Costa Sobral, B Couturier, G A Cowan, D C Craik, A Crocombe, M Cruz Torres, R Currie, C L Da Silva, E Dall'Occo, J Dalseno, C D'Ambrosio, A Danilina, P d'Argent, A Davis, O De Aguiar Francisco, K De Bruyn, S De Capua, M De Cian, J M De Miranda, L De Paula, M De Serio, P De Simone, J A de Vries, C T Dean, W Dean, D Decamp, L Del Buono, B Delaney, H-P Dembinski, M Demmer, A Dendek, D Derkach, O Deschamps, F Desse, F Dettori, B Dey, A Di Canto, P Di Nezza, S Didenko, H Dijkstra, F Dordei, M Dorigo, A C Dos Reis, A Dosil Suárez, L Douglas, A Dovbnya, K Dreimanis, L Dufour, G Dujany, P Durante, J M Durham, D Dutta, R Dzhelyadin, M Dziewiecki, A Dziurda, A Dzyuba, S Easo, U Egede, V Egorychev, S Eidelman, S Eisenhardt, U Eitschberger, R Ekelhof, L Eklund, S Ely, A Ene, S Escher, S Esen, T Evans, A Falabella, C Färber, N Farley, S Farry, D Fazzini, M Féo, P Fernandez Declara, A Fernandez Prieto, F Ferrari, L Ferreira Lopes, F Ferreira Rodrigues, S Ferreres Sole, M Ferro-Luzzi, S Filippov, R A Fini, M Fiorini, M Firlej, C Fitzpatrick, T Fiutowski, F Fleuret, M Fontana, F Fontanelli, R Forty, V Franco Lima, M Frank, C Frei, J Fu, W 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Hushchyn, D Hutchcroft, D Hynds, P Ibis, M Idzik, P Ilten, A Inglessi, A Inyakin, K Ivshin, R Jacobsson, S Jakobsen, J Jalocha, E Jans, B K Jashal, A Jawahery, F Jiang, M John, D Johnson, C R Jones, C Joram, B Jost, N Jurik, S Kandybei, M Karacson, J M Kariuki, S Karodia, N Kazeev, M Kecke, F Keizer, M Kelsey, M Kenzie, T Ketel, B Khanji, A Kharisova, C Khurewathanakul, K E Kim, T Kirn, V S Kirsebom, S Klaver, K Klimaszewski, S Koliiev, M Kolpin, R Kopecna, P Koppenburg, I Kostiuk, S Kotriakhova, M Kozeiha, L Kravchuk, M Kreps, F Kress, S Kretzschmar, P Krokovny, W Krupa, W Krzemien, W Kucewicz, M Kucharczyk, V Kudryavtsev, G J Kunde, A K Kuonen, T Kvaratskheliya, D Lacarrere, G Lafferty, A Lai, D Lancierini, G Lanfranchi, C Langenbruch, T Latham, C Lazzeroni, R Le Gac, R Lefèvre, A Leflat, F Lemaitre, O Leroy, T Lesiak, B Leverington, H Li, P-R Li, X Li, Y Li, Z Li, X Liang, T Likhomanenko, R Lindner, F Lionetto, V Lisovskyi, G Liu, X Liu, D Loh, A Loi, I Longstaff, J H Lopes, G Loustau, G H Lovell, D Lucchesi, M Lucio Martinez, Y Luo, A Lupato, E Luppi, O Lupton, A Lusiani, X Lyu, F Machefert, F Maciuc, V Macko, P Mackowiak, S Maddrell-Mander, O Maev, K Maguire, D Maisuzenko, M W Majewski, S Malde, B Malecki, A Malinin, T Maltsev, H Malygina, G Manca, G Mancinelli, D Marangotto, J Maratas, J F Marchand, U Marconi, C Marin Benito, M Marinangeli, P Marino, J Marks, P J Marshall, G Martellotti, M Martinelli, D Martinez Santos, F Martinez Vidal, A Massafferri, M Materok, R Matev, A Mathad, Z Mathe, V Matiunin, C Matteuzzi, K R Mattioli, A Mauri, E Maurice, B Maurin, M McCann, A McNab, R McNulty, J V Mead, B Meadows, C Meaux, N Meinert, D Melnychuk, M Merk, A Merli, E Michielin, D A Milanes, E Millard, M-N Minard, L Minzoni, D S Mitzel, A Mödden, A Mogini, R D Moise, T Mombächer, I A Monroy, S Monteil, M Morandin, G Morello, M J Morello, J Moron, A B Morris, R Mountain, F Muheim, M Mukherjee, M Mulder, D Müller, J Müller, K Müller, V Müller, C H Murphy, D Murray, P Naik, T Nakada, R Nandakumar, A Nandi, T Nanut, I Nasteva, M Needham, N Neri, S Neubert, N Neufeld, R Newcombe, T D Nguyen, C Nguyen-Mau, S Nieswand, R Niet, N Nikitin, N S Nolte, A Oblakowska-Mucha, V Obraztsov, S Ogilvy, D P O'Hanlon, R Oldeman, C J G Onderwater, J D Osborn, A Ossowska, J M Otalora Goicochea, T Ovsiannikova, P Owen, A Oyanguren, P R Pais, T Pajero, A Palano, M Palutan, G Panshin, A Papanestis, M Pappagallo, L L Pappalardo, W Parker, C Parkes, G Passaleva, A Pastore, M Patel, C Patrignani, A Pearce, A Pellegrino, G Penso, M Pepe Altarelli, S Perazzini, D Pereima, P Perret, L Pescatore, K Petridis, A Petrolini, A Petrov, S Petrucci, M Petruzzo, B Pietrzyk, G Pietrzyk, M Pikies, M Pili, D Pinci, J Pinzino, F Pisani, A Piucci, V Placinta, S Playfer, J Plews, M Plo Casasus, F Polci, M Poli Lener, M Poliakova, A Poluektov, N Polukhina, I Polyakov, E Polycarpo, G J Pomery, S Ponce, A Popov, D Popov, S Poslavskii, E Price, C Prouve, V Pugatch, A Puig Navarro, H Pullen, G Punzi, W Qian, J Qin, R Quagliani, B Quintana, N V Raab, B Rachwal, J H Rademacker, M Rama, M Ramos Pernas, M S Rangel, F Ratnikov, G Raven, M Ravonel Salzgeber, M Reboud, F Redi, S Reichert, F Reiss, C Remon Alepuz, Z Ren, V Renaudin, S Ricciardi, S Richards, K Rinnert, P Robbe, A Robert, A B Rodrigues, E Rodrigues, J A Rodriguez Lopez, M Roehrken, S Roiser, A Rollings, V Romanovskiy, A Romero Vidal, J D Roth, M Rotondo, M S Rudolph, T Ruf, J Ruiz Vidal, J J Saborido Silva, N Sagidova, B Saitta, V Salustino Guimaraes, C Sanchez Gras, C Sanchez Mayordomo, B Sanmartin Sedes, R Santacesaria, C Santamarina Rios, M Santimaria, E Santovetti, G Sarpis, A Sarti, C Satriano, A Satta, M Saur, D Savrina, S Schael, M Schellenberg, M Schiller, H Schindler, M Schmelling, T Schmelzer, B Schmidt, O Schneider, A Schopper, H F Schreiner, M Schubiger, S Schulte, M H Schune, R Schwemmer, B Sciascia, A Sciubba, A Semennikov, E S Sepulveda, A Sergi, N Serra, J Serrano, L Sestini, A Seuthe, P Seyfert, M Shapkin, T Shears, L Shekhtman, V Shevchenko, E Shmanin, B G Siddi, R Silva Coutinho, L Silva de Oliveira, G Simi, S Simone, I Skiba, N Skidmore, T Skwarnicki, M W Slater, J G Smeaton, E Smith, I T Smith, M Smith, M Soares, L Soares Lavra, M D Sokoloff, F J P Soler, B Souza De Paula, B Spaan, E Spadaro Norella, P Spradlin, F Stagni, M Stahl, S Stahl, P Stefko, S Stefkova, O Steinkamp, S Stemmle, O Stenyakin, M Stepanova, H Stevens, A Stocchi, S Stone, S Stracka, M E Stramaglia, M Straticiuc, U Straumann, S Strokov, J Sun, L Sun, Y Sun, K Swientek, A Szabelski, T Szumlak, M Szymanski, Z Tang, T Tekampe, G Tellarini, F Teubert, E Thomas, M J Tilley, V Tisserand, S T'Jampens, M Tobin, S Tolk, L Tomassetti, D Tonelli, D Y Tou, R Tourinho Jadallah Aoude, E Tournefier, M Traill, M T Tran, A Trisovic, A Tsaregorodtsev, G Tuci, A Tully, N Tuning, A Ukleja, A Usachov, A Ustyuzhanin, U Uwer, A Vagner, V Vagnoni, A Valassi, S Valat, G Valenti, M van Beuzekom, H Van Hecke, E van Herwijnen, C B Van 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Affiliations

  1. Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands.
  2. Physik-Institut, Universität Zürich, Zürich, Switzerland.
  3. Instituto Galego de Física de Altas Enerxías (IGFAE), Universidade de Santiago de Compostela, Santiago de Compostela, Spain.
  4. H.H. Wills Physics Laboratory, University of Bristol, Bristol, United Kingdom.
  5. University of Michigan, Ann Arbor, USA (associated with Institution Syracuse University, Syracuse, New York, USA).
  6. Université Clermont Auvergne, CNRS/IN2P3, LPC, Clermont-Ferrand, France.
  7. University of Cincinnati, Cincinnati, Ohio, USA.
  8. INFN Laboratori Nazionali di Frascati, Frascati, Italy.
  9. Fakultät Physik, Technische Universität Dortmund, Dortmund, Germany.
  10. European Organization for Nuclear Research (CERN), Geneva, Switzerland.
  11. School of Physics and Astronomy, University of Glasgow, Glasgow, United Kingdom.
  12. ICCUB, Universitat de Barcelona, Barcelona, Spain.
  13. Petersburg Nuclear Physics Institute NRC Kurchatov Institute (PNPI NRC KI), Gatchina, Russia, St.Petersburg, Russia.
  14. Imperial College London, London, United Kingdom.
  15. Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil.
  16. LAL, University Paris-Sud, CNRS/IN2P3, Université Paris-Saclay, Orsay, France.
  17. INFN Sezione di Firenze, Firenze, Italy.
  18. Institute of Physics, Ecole Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland.
  19. INFN Sezione di Ferrara, Ferrara, Italy.
  20. University of Maryland, College Park, Maryland, USA.
  21. Aix Marseille Univ, CNRS/IN2P3, CPPM, Marseille, France.
  22. Institute for High Energy Physics NRC Kurchatov Institute (IHEP NRC KI), Protvino, Russia, Protvino, Russia.
  23. Syracuse University, Syracuse, New York, USA.
  24. Yandex School of Data Analysis, Moscow, Russia.
  25. INFN Sezione di Cagliari, Monserrato, Italy.
  26. Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany.
  27. Department of Physics, University of Warwick, Coventry, United Kingdom.
  28. School of Physics and Astronomy, University of Manchester, Manchester, United Kingdom.
  29. INFN Sezione di Genova, Genova, Italy.
  30. National University of Science and Technology "MISIS", Moscow, Russia [associated with Institution Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia].
  31. National Center for Nuclear Research (NCBJ), Warsaw, Poland.
  32. INFN Sezione di Pisa, Pisa, Italy.
  33. Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil.
  34. University of Chinese Academy of Sciences, Beijing, China.
  35. INFN Sezione di Milano-Bicocca, Milano, Italy.
  36. Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia.
  37. LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France.
  38. I. Physikalisches Institut, RWTH Aachen University, Aachen, Germany.
  39. Institute of Nuclear Physics, Moscow State University (SINP MSU), Moscow, Russia.
  40. INFN Sezione di Padova, Padova, Italy.
  41. INFN Sezione di Bologna, Bologna, Italy.
  42. Cavendish Laboratory, University of Cambridge, Cambridge, United Kingdom.
  43. Henryk Niewodniczanski Institute of Nuclear Physics Polish Academy of Sciences, Kraków, Poland.
  44. University of Birmingham, Birmingham, United Kingdom.
  45. Department of Physics, University of Oxford, Oxford, United Kingdom.
  46. INFN Sezione di Roma La Sapienza, Roma, Italy.
  47. Massachusetts Institute of Technology, Cambridge, Massachusetts, USA.
  48. Budker Institute of Nuclear Physics (SB RAS), Novosibirsk, Russia.
  49. Oliver Lodge Laboratory, University of Liverpool, Liverpool, United Kingdom.
  50. School of Physics and Technology, Wuhan University, Wuhan, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
  51. INFN Sezione di Roma Tor Vergata, Roma, Italy.
  52. University Grenoble Alpes, University Savoie Mont Blanc, CNRS, IN2P3-LAPP, Annecy, France.
  53. Center for High Energy Physics, Tsinghua University, Beijing, China.
  54. School of Physics and Astronomy, University of Edinburgh, Edinburgh, United Kingdom.
  55. Horia Hulubei National Institute of Physics and Nuclear Engineering, Bucharest-Magurele, Romania.
  56. Los Alamos National Laboratory (LANL), Los Alamos, USA (associated with Institution Syracuse University, Syracuse, New York, USA).
  57. INFN Sezione di Bari, Bari, Italy.
  58. Max-Planck-Institut für Kernphysik (MPIK), Heidelberg, Germany.
  59. AGH - University of Science and Technology, Faculty of Physics and Applied Computer Science, Kraków, Poland.
  60. National Research University Higher School of Economics, Moscow, Russia (associated with Institution Yandex School of Data Analysis, Moscow, Russia).
  61. Institute of Particle Physics, Central China Normal University, Wuhan, Hubei, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
  62. NSC Kharkiv Institute of Physics and Technology (NSC KIPT), Kharkiv, Ukraine.
  63. STFC Rutherford Appleton Laboratory, Didcot, United Kingdom.
  64. Institute for Nuclear Research of the Russian Academy of Sciences (INR RAS), Moscow, Russia.
  65. INFN Sezione di Milano, Milano, Italy.
  66. Instituto de Fisica Corpuscular, Centro Mixto Universidad de Valencia - CSIC, Valencia, Spain (associated with Institution ICCUB, Universitat de Barcelona, Barcelona, Spain).
  67. 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].
  68. Institut für Physik, Universität Rostock, Rostock, Germany (associated with Institution Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany).
  69. Laboratory of Mathematical and Subatomic Physics, Constantine, Algeria [associated with Institution Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil].
  70. Nikhef National Institute for Subatomic Physics and VU University Amsterdam, Amsterdam, Netherlands.
  71. National Research Tomsk Polytechnic University, Tomsk, Russia [associated with Institution Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia].
  72. Institute for Nuclear Research of the National Academy of Sciences (KINR), Kyiv, Ukraine.
  73. South China Normal University, Guangzhou, China (associated with Institution Center for High Energy Physics, Tsinghua University, Beijing, China).
  74. Institute Of High Energy Physics (ihep), Beijing, China.
  75. National Research Centre Kurchatov Institute, Moscow, Russia [associated with Institution Institute of Theoretical and Experimental Physics NRC Kurchatov Institute (ITEP NRC KI), Moscow, Russia, Moscow, Russia].
  76. School of Physics, University College Dublin, Dublin, Ireland.
  77. Departamento de Fisica, Universidad Nacional de Colombia, Bogota, Colombia (associated with Institution LPNHE, Sorbonne Université, Paris Diderot Sorbonne Paris Cité, CNRS/IN2P3, Paris, France).
  78. Van Swinderen Institute, University of Groningen, Groningen, Netherlands (associated with Institution Nikhef National Institute for Subatomic Physics, Amsterdam, Netherlands).

PMID: 31144932 DOI: 10.1103/PhysRevLett.122.191801

Abstract

A measurement of the ratio of branching fractions of the decays B^{+}→K^{+}μ^{+}μ^{-} and B^{+}→K^{+}e^{+}e^{-} is presented. The proton-proton collision data used correspond to an integrated luminosity of 5.0  fb^{-1} recorded with the LHCb experiment at center-of-mass energies of 7, 8, and 13 TeV. For the dilepton mass-squared range 1.1

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