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Article
Report number arXiv:1708.08856 ; LHCB-PAPER-2017-017 ; CERN-EP-2017-212 ; LHCB-PAPER-2017-017
Title Measurement of the ratio of the $B^0 \to D^{*-} \tau^+ \nu_{\tau}$ and $B^0 \to D^{*-} \mu^+ \nu_{\mu}$ branching fractions using three-prong $\tau$-lepton decays
Author(s)

Aaij, R. ; Adeva, Bernardo (U. Santiago de Compostela (main)) ; Adinolfi, Marco (Bristol U.) ; Ajaltouni, Ziad (Clermont-Ferrand U.) ; Akar, Simon (Cincinnati U.) ; Albrecht, Johannes (Tech. U., Dortmund (main)) ; Alessio, Federico (CERN) ; Alexander, Michael (Glasgow U.) ; Alfonso Albero, Alejandro (U. Barcelona (main)) ; Ali, Suvayu (NIKHEF, Amsterdam) ; Alkhazov, Georgy (St. Petersburg, INP) ; Alvarez Cartelle, Paula (Imperial Coll., London) ; Alves Jr, Antonio Augusto (Cincinnati U.) ; Amato, Sandra (Rio de Janeiro Federal U.) ; Amerio, Silvia (INFN, Padua) ; Amhis, Yasmine (Orsay, LAL) ; An, Liupan (Peking U., CHEP) ; Anderlini, Lucio (INFN, Florence) ; Andreassi, Guido (Ecole Polytechnique, Lausanne) ; Andreotti, Mirco (INFN, Ferrara ; Ferrara U.) ; Andrews, Jason (Maryland U., College Park) ; Appleby, Robert (Manchester U.) ; Archilli, Flavio (NIKHEF, Amsterdam) ; d'Argent, Philippe (Heidelberg U.) ; Arnau Romeu, Joan (Marseille, CPPM) ; Artamonov, Alexander (Serpukhov, IHEP) ; Artuso, Marina (Syracuse U.) ; Aslanides, Elie (Marseille, CPPM) ; Auriemma, Giulio (INFN, Rome) ; Baalouch, Marouen (Clermont-Ferrand U.) ; Babuschkin, Igor (Manchester U.) ; Bachmann, Sebastian (Heidelberg U.) ; Back, John (Warwick U.) ; Badalov, Alexey (U. Barcelona (main) ; Ramon Llull U., Barcelona) ; Baesso, Clarissa (Rio de Janeiro, Pont. U. Catol.) ; Baker, Sophie (Imperial Coll., London) ; Balagura, Vladislav (Orsay, LAL) ; Baldini, Wander (INFN, Ferrara) ; Baranov, Alexander (Moscow, INR) ; Barlow, Roger (Manchester U.) ; Barschel, Colin (CERN) ; Barsuk, Sergey (Orsay, LAL) ; Barter, William (Manchester U.) ; Baryshnikov, Fedor (Moscow, ITEP) ; Batozskaya, Varvara (NCBJ, Swierk) ; Battista, Vincenzo (Ecole Polytechnique, Lausanne) ; Bay, Aurelio (Ecole Polytechnique, Lausanne) ; Beaucourt, Leo (Annecy, LAPP) ; Beddow, John (Glasgow U.) ; Bedeschi, Franco (INFN, Pisa) ; Bediaga, Ignacio (Rio de Janeiro, CBPF) ; Beiter, Andrew (Syracuse U.) ; Bel, Lennaert (NIKHEF, Amsterdam) ; Beliy, Nikita (U. Mons) ; Bellee, Violaine (Ecole Polytechnique, Lausanne) ; Belloli, Nicoletta (INFN, Milan Bicocca ; Milan Bicocca U.) ; Belous, Konstantin (Serpukhov, IHEP) ; Belyaev, Ivan (Moscow, ITEP) ; Ben-Haim, Eli (Paris U., VI-VII) ; Bencivenni, Giovanni (Frascati) ; Benson, Sean (NIKHEF, Amsterdam) ; Beranek, Sarah (Aachen, Tech. Hochsch.) ; Berezhnoy, Alexander (SINP, Moscow) ; Bernet, Roland (Zurich U.) ; Berninghoff, Daniel (Heidelberg U.) ; Bertholet, Emilie (Paris U., VI-VII) ; Bertolin, Alessandro (INFN, Padua) ; Betancourt, Christopher (Zurich U.) ; Betti, Federico (INFN, Bologna) ; Bettler, Marc-Olivier (CERN) ; van Beuzekom, Martinus (NIKHEF, Amsterdam) ; Bezshyiko, Iaroslava (Zurich U.) ; Bifani, Simone (Birmingham U.) ; Billoir, Pierre (Paris U., VI-VII) ; Birnkraut, Alex (Tech. U., Dortmund (main)) ; Bitadze, Alexander (Manchester U.) ; Bizzeti, Andrea (INFN, Florence ; U. Modena (main)) ; Bjørn, Mikkel (Oxford U.) ; Blake, Thomas (Warwick U.) ; Blanc, Frederic (Ecole Polytechnique, Lausanne) ; Blouw, Johan (Heidelberg, Max Planck Inst.) ; Blusk, Steven (Syracuse U.) ; Bocci, Valerio (INFN, Rome) ; Boettcher, Thomas (MIT) ; Bondar, Alexander (Novosibirsk, IYF ; Novosibirsk State U.) ; Bondar, Nikolay (St. Petersburg, INP) ; Bonivento, Walter (INFN, Cagliari) ; Bordyuzhin, Igor (Moscow, ITEP) ; Borgheresi, Alessio (INFN, Milan Bicocca ; Milan Bicocca U.) ; Borghi, Silvia (Manchester U.) ; Borisyak, Maxim (Yandex Sch. Data Anal., Moscow) ; Borsato, Martino (U. Santiago de Compostela (main)) ; Bossu, Francesco (Orsay, LAL) ; Boubdir, Meriem (Aachen, Tech. Hochsch.) ; Bowcock, Themistocles (Liverpool U.) ; Bowen, Espen Eie (Zurich U.) ; Bozzi, Concezio (INFN, Ferrara ; CERN) ; Braun, Svende (Heidelberg U.) ; Britton, Thomas (Syracuse U.) ; Brodzicka, Jolanta (Cracow, INP) ; Brundu, Davide (INFN, Cagliari) ; Buchanan, Emma (Bristol U.) ; Burr, Christopher (Manchester U.) ; Bursche, Albert (INFN, Cagliari ; Cagliari U.) ; Buytaert, Jan (CERN) ; Byczynski, Wiktor (CERN) ; Cadeddu, Sandro (INFN, Cagliari) ; Cai, Hao ; Calabrese, Roberto (INFN, Ferrara ; Ferrara U.) ; Calladine, Ryan (Birmingham U.) ; Calvi, Marta (INFN, Milan Bicocca ; Milan Bicocca U.) ; Calvo Gomez, Miriam (U. Barcelona (main) ; Ramon Llull U., Barcelona) ; Camboni, Alessandro (U. Barcelona (main) ; Ramon Llull U., Barcelona) ; Campana, Pierluigi (Frascati) ; Campora Perez, Daniel Hugo (CERN) ; Capriotti, Lorenzo (Manchester U.) ; Carbone, Angelo (INFN, Bologna ; Bologna U.) ; Carboni, Giovanni (INFN, Rome2 ; Rome U., Tor Vergata) ; Cardinale, Roberta (INFN, Genoa ; Genoa U.) ; Cardini, Alessandro (INFN, Cagliari) ; Carniti, Paolo (INFN, Milan Bicocca ; Milan Bicocca U.) ; Carson, Laurence (Edinburgh U.) ; Carvalho Akiba, Kazuyoshi (Rio de Janeiro Federal U.) ; Casse, Gianluigi (Liverpool U.) ; Cassina, Lorenzo (INFN, Milan Bicocca) ; Castillo Garcia, Lucia (Ecole Polytechnique, Lausanne) ; Cattaneo, Marco (CERN) ; Cavallero, Giovanni (INFN, Genoa ; CERN ; Genoa U.) ; Cenci, Riccardo (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Chamont, David (Orsay, LAL) ; Chapman, Matthew George (Bristol U.) ; Charles, Matthew (Paris U., VI-VII) ; Charpentier, Philippe (CERN) ; Chatzikonstantinidis, Georgios (Birmingham U.) ; Chefdeville, Maximilien (Annecy, LAPP) ; Chen, Shanzhen (Manchester U.) ; Cheung, Shu Faye (Oxford U.) ; Chitic, Stefan-Gabriel (CERN) ; Chobanova, Veronika (U. Santiago de Compostela (main)) ; Chrzaszcz, Marcin (Zurich U. ; Cracow, INP) ; Chubykin, Alexsei (St. Petersburg, INP) ; Ciambrone, Paolo (Frascati) ; Cid Vidal, Xabier (U. Santiago de Compostela (main)) ; Ciezarek, Gregory (NIKHEF, Amsterdam) ; Clarke, Peter (Edinburgh U.) ; Clemencic, Marco (CERN) ; Cliff, Harry (Cambridge U.) ; Closier, Joel (CERN) ; Coco, Victor (Cincinnati U.) ; Cogan, Julien (Marseille, CPPM) ; Cogneras, Eric (Clermont-Ferrand U.) ; Cogoni, Violetta (INFN, Cagliari ; Cagliari U.) ; Cojocariu, Lucian (Bucharest, IFIN-HH) ; Collins, Paula (CERN) ; Colombo, Tommaso (CERN) ; Comerma-Montells, Albert (Heidelberg U.) ; Contu, Andrea (CERN) ; Cook, Andrew (Bristol U.) ; Coombs, George (CERN) ; Coquereau, Samuel (U. Barcelona (main)) ; Corti, Gloria (CERN) ; Corvo, Marco (INFN, Ferrara ; Ferrara U.) ; Costa Sobral, Cayo Mar (Warwick U.) ; Couturier, Benjamin (CERN) ; Cowan, Greig (Edinburgh U.) ; Craik, Daniel Charles (Edinburgh U.) ; Crocombe, Andrew (Warwick U.) ; Cruz Torres, Melissa Maria (Rio de Janeiro, Pont. U. Catol.) ; Currie, Robert (Edinburgh U.) ; D'Ambrosio, Carmelo (CERN) ; Da Cunha Marinho, Franciole (Rio de Janeiro Federal U.) ; Dall'Occo, Elena (NIKHEF, Amsterdam) ; Dalseno, Jeremy (Bristol U.) ; Davis, Adam (Peking U., CHEP) ; De Aguiar Francisco, Oscar (Liverpool U.) ; De Bruyn, Kristof (Marseille, CPPM) ; De Capua, Stefano (Manchester U.) ; De Cian, Michel (Heidelberg U.) ; De Miranda, Jussara (Rio de Janeiro, CBPF) ; De Paula, Leandro (Rio de Janeiro Federal U.) ; De Serio, Marilisa (INFN, Bari ; Bari U.) ; De Simone, Patrizia (Frascati) ; Dean, Cameron Thomas (Glasgow U.) ; Decamp, Daniel (Annecy, LAPP) ; Del Buono, Luigi (Paris U., VI-VII) ; Dembinski, Hans Peter (Heidelberg, Max Planck Inst.) ; Demmer, Moritz (Tech. U., Dortmund (main)) ; Dendek, Adam (AGH-UST, Cracow) ; Derkach, Denis (Yandex Sch. Data Anal., Moscow) ; Deschamps, Olivier (Clermont-Ferrand U.) ; Dettori, Francesco (Liverpool U.) ; Dey, Biplab (CCNU, Wuhan, Inst. Part. Phys.) ; Di Canto, Angelo (CERN) ; Di Nezza, Pasquale (Frascati) ; Dijkstra, Hans (CERN) ; Dordei, Francesca (CERN) ; Dorigo, Mirco (CERN) ; Dosil Suárez, Alvaro (U. Santiago de Compostela (main)) ; Douglas, Lauren (Glasgow U.) ; Dovbnya, Anatoliy (Kharkov, KIPT) ; Dreimanis, Karlis (Liverpool U.) ; Dufour, Laurent (NIKHEF, Amsterdam) ; Dujany, Giulio (Paris U., VI-VII) ; Dungs, Kevin (CERN) ; Durante, Paolo (CERN) ; Dzhelyadin, Rustem (Serpukhov, IHEP) ; Dziewiecki, Michal (Heidelberg U.) ; Dziurda, Agnieszka (CERN) ; Dzyuba, Alexey (St. Petersburg, INP) ; Déléage, Nicolas (Annecy, LAPP) ; Easo, Sajan (Rutherford) ; Ebert, Marcus (Edinburgh U.) ; Egede, Ulrik (Imperial Coll., London) ; Egorychev, Victor (Moscow, ITEP) ; Eidelman, Semen (Novosibirsk, IYF ; Novosibirsk State U.) ; Eisenhardt, Stephan (Edinburgh U.) ; Eitschberger, Ulrich (Tech. U., Dortmund (main)) ; Ekelhof, Robert (Tech. U., Dortmund (main)) ; Eklund, Lars (Glasgow U.) ; Ely, Scott (Syracuse U.) ; Esen, Sevda (Heidelberg U.) ; Evans, Hannah Mary (Cambridge U.) ; Evans, Timothy (Oxford U.) ; Falabella, Antonio (INFN, Bologna) ; Farley, Nathanael (Birmingham U.) ; Farry, Stephen (Liverpool U.) ; Fay, Robert (Liverpool U.) ; Fazzini, Davide (INFN, Milan Bicocca ; Milan Bicocca U.) ; Federici, Luca (INFN, Rome2) ; Ferguson, Dianne (Edinburgh U.) ; Fernandez, Gerard (U. Barcelona (main)) ; Fernandez Declara, Placido (CERN) ; Fernandez Prieto, Antonio (U. Santiago de Compostela (main)) ; Ferrari, Fabio (INFN, Bologna) ; Ferreira Rodrigues, Fernando (Rio de Janeiro Federal U.) ; Ferro-Luzzi, Massimiliano (CERN) ; Filippov, Sergey (Moscow, INR) ; Fini, Rosa Anna (INFN, Bari) ; Fiore, Marco (INFN, Ferrara ; Ferrara U.) ; Fiorini, Massimiliano (INFN, Ferrara ; Ferrara U.) ; Firlej, Miroslaw (AGH-UST, Cracow) ; Fitzpatrick, Conor (Ecole Polytechnique, Lausanne) ; Fiutowski, Tomasz (AGH-UST, Cracow) ; Fleuret, Frederic (Orsay, LAL) ; Fohl, Klaus (CERN) ; Fontana, Marianna (INFN, Cagliari ; CERN) ; Fontanelli, Flavio (INFN, Genoa ; Genoa U.) ; Forshaw, Dean Charles (Syracuse U.) ; Forty, Roger (CERN) ; Franco Lima, Vinicius (Liverpool U.) ; Frank, Markus (CERN) ; Frei, Christoph (CERN) ; Fu, Jinlin (INFN, Milan ; U. Milan (main)) ; Funk, Wolfgang (CERN) ; Furfaro, Emiliano (INFN, Rome2 ; Rome U., Tor Vergata) ; Färber, Christian (CERN) ; Gabriel, Emmy (Edinburgh U.) ; Gallas Torreira, Abraham (U. Santiago de Compostela (main)) ; Galli, Domenico (INFN, Bologna ; Bologna U.) ; Gallorini, Stefano (INFN, Padua) ; Gambetta, Silvia (Edinburgh U.) ; Gandelman, Miriam (Rio de Janeiro Federal U.) ; Gandini, Paolo (Oxford U.) ; Gao, Yuanning (Peking U., CHEP) ; Garcia Martin, Luis Miguel (Valencia U., IFIC) ; García Pardiñas, Julián (U. Santiago de Compostela (main)) ; Garra Tico, Jordi (Cambridge U.) ; Garrido, Lluis (U. Barcelona (main)) ; Garsed, Philip John (Cambridge U.) ; Gascon, David (U. Barcelona (main)) ; Gaspar, Clara (CERN) ; Gavardi, Laura (Tech. U., Dortmund (main)) ; Gazzoni, Giulio (Clermont-Ferrand U.) ; Gerick, David (Heidelberg U.) ; Gersabeck, Evelina (Heidelberg U.) ; Gersabeck, Marco (Manchester U.) ; Gershon, Timothy (Warwick U.) ; Ghez, Philippe (Annecy, LAPP) ; Gianì, Sebastiana (Ecole Polytechnique, Lausanne) ; Gibson, Valerie (Cambridge U.) ; Girard, Olivier Göran (Ecole Polytechnique, Lausanne) ; Giubega, Lavinia-Helena (Bucharest, IFIN-HH) ; Gizdov, Konstantin (Edinburgh U.) ; Gligorov, Vladimir (Paris U., VI-VII) ; Golubkov, Dmitry (Moscow, ITEP) ; Golutvin, Andrey (Imperial Coll., London ; CERN) ; Gomes, Alvaro (Rio de Janeiro, CBPF ; UFTM, Uberaba) ; Gorelov, Igor Vladimirovich (SINP, Moscow) ; Gotti, Claudio (INFN, Milan Bicocca ; Milan Bicocca U.) ; Govorkova, Ekaterina (NIKHEF, Amsterdam) ; Grabowski, Jascha Peter (Heidelberg U.) ; Graciani Diaz, Ricardo (U. Barcelona (main)) ; Granado Cardoso, Luis Alberto (CERN) ; Graugés, Eugeni (U. Barcelona (main)) ; Graverini, Elena (Zurich U.) ; Graziani, Giacomo (INFN, Florence) ; Grecu, Alexandru (Bucharest, IFIN-HH) ; Greim, Roman (Aachen, Tech. Hochsch.) ; Griffith, Peter (INFN, Cagliari) ; Grillo, Lucia (INFN, Milan Bicocca ; CERN ; Milan Bicocca U.) ; Gruber, Lukas (CERN) ; Gruberg Cazon, Barak Raimond (Oxford U.) ; Grünberg, Oliver (Rostock U.) ; Gushchin, Evgeny (Moscow, INR) ; Guz, Yury (Serpukhov, IHEP) ; Gys, Thierry (CERN) ; Göbel, Carla (Rio de Janeiro, Pont. U. Catol.) ; Hadavizadeh, Thomas (Oxford U.) ; Hadjivasiliou, Christos (Clermont-Ferrand U.) ; Haefeli, Guido (Ecole Polytechnique, Lausanne) ; Haen, Christophe (CERN) ; Haines, Susan (Cambridge U.) ; Hamilton, Brian (Maryland U., College Park) ; Han, Xiaoxue (Heidelberg U.) ; Hancock, Thomas Henry (Oxford U.) ; Hansmann-Menzemer, Stephanie (Heidelberg U.) ; Harnew, Neville (Oxford U.) ; Harnew, Samuel (Bristol U.) ; Harrison, Jonathan (Manchester U.) ; Hasse, Christoph (CERN) ; Hatch, Mark (CERN) ; He, Jibo (Beijing, GUCAS) ; Hecker, Malte (Imperial Coll., London) ; Heinicke, Kevin (Tech. U., Dortmund (main)) ; Heister, Arno (Aachen, Tech. Hochsch.) ; Hennessy, Karol (Liverpool U.) ; Henrard, Pierre (Clermont-Ferrand U.) ; Henry, Louis (Valencia U., IFIC) ; van Herwijnen, Eric (CERN) ; Heß, Miriam (Rostock U.) ; Hicheur, Adlène (Rio de Janeiro Federal U.) ; Hill, Donal (Oxford U.) ; Hombach, Christoph (Manchester U.) ; Hopchev, Plamen Hristov (Ecole Polytechnique, Lausanne) ; Huard, Zachary (Cincinnati U.) ; Hulsbergen, Wouter (NIKHEF, Amsterdam) ; Humair, Thibaud (Imperial Coll., London) ; Hushchyn, Mikhail (Yandex Sch. Data Anal., Moscow) ; Hutchcroft, David (Liverpool U.) ; Ibis, Philipp (Tech. U., Dortmund (main)) ; Idzik, Marek (AGH-UST, Cracow) ; Ilten, Philip (MIT) ; Jacobsson, Richard (CERN) ; Jalocha, Pawel (Oxford U.) ; Jans, Eddy (NIKHEF, Amsterdam) ; Jawahery, Abolhassan (Maryland U., College Park) ; Jiang, Feng (Peking U., CHEP) ; John, Malcolm (Oxford U.) ; Johnson, Daniel (CERN) ; Jones, Christopher (Cambridge U.) ; Joram, Christian (CERN) ; Jost, Beat (CERN) ; Jurik, Nathan (Oxford U.) ; Kandybei, Sergii (Kharkov, KIPT) ; Karacson, Matthias (CERN) ; Kariuki, James Mwangi (Bristol U.) ; Karodia, Sarah (Glasgow U.) ; Kazeev, Nikita (CERN ; Moscow, MIPT ; Yandex Sch. Data Anal., Moscow) ; Kecke, Matthieu (Heidelberg U.) ; Kelsey, Matthew (Syracuse U.) ; Kenzie, Matthew (Cambridge U.) ; Ketel, Tjeerd (Nikhef, Amsterdam ; Vrije U., Amsterdam) ; Khairullin, Egor (Yandex Sch. Data Anal., Moscow) ; Khanji, Basem (Heidelberg U.) ; Khurewathanakul, Chitsanu (Ecole Polytechnique, Lausanne) ; Kirn, Thomas (Aachen, Tech. Hochsch.) ; Klaver, Suzanne (Manchester U.) ; Klimaszewski, Konrad (NCBJ, Swierk) ; Klimkovich, Tatsiana (Heidelberg, Max Planck Inst.) ; Koliiev, Serhii (Kiev, INR) ; Kolpin, Michael (Heidelberg U.) ; Komarov, Ilya (Ecole Polytechnique, Lausanne) ; Kopecna, Renata (Heidelberg U.) ; Koppenburg, Patrick (NIKHEF, Amsterdam) ; Kosmyntseva, Alena (Moscow, ITEP) ; Kotriakhova, Sofia (St. Petersburg, INP) ; Kozeiha, Mohamad (Clermont-Ferrand U.) ; Kravchuk, Leonid (Moscow, INR) ; Kreps, Michal (Warwick U.) ; Krokovny, Pavel (Novosibirsk, IYF ; Novosibirsk State U.) ; Kruse, Florian (Tech. U., Dortmund (main)) ; Krzemien, Wojciech (NCBJ, Swierk) ; Kucewicz, Wojciech (Cracow, INP ; AGH-UST, Cracow) ; Kucharczyk, Marcin (Cracow, INP) ; Kudryavtsev, Vasily (Novosibirsk, IYF ; Novosibirsk State U.) ; Kuonen, Axel Kevin (Ecole Polytechnique, Lausanne) ; Kurek, Krzysztof (NCBJ, Swierk) ; Kvaratskheliya, Tengiz (Moscow, ITEP ; CERN) ; Lacarrere, Daniel (CERN) ; Lafferty, George (Manchester U.) ; Lai, Adriano (INFN, Cagliari) ; Lanfranchi, Gaia (Frascati) ; Langenbruch, Christoph (Aachen, Tech. Hochsch.) ; Latham, Thomas (Warwick U.) ; Lazzeroni, Cristina (Birmingham U.) ; Le Gac, Renaud (Marseille, CPPM) ; van Leerdam, Jeroen (NIKHEF, Amsterdam) ; Leflat, Alexander (SINP, Moscow ; CERN) ; Lefrançois, Jacques (Orsay, LAL) ; Lefèvre, Regis (Clermont-Ferrand U.) ; Lemaitre, Florian (CERN) ; Lemos Cid, Edgar (U. Santiago de Compostela (main)) ; Leroy, Olivier (Marseille, CPPM) ; Lesiak, Tadeusz (Cracow, INP) ; Leverington, Blake (Heidelberg U.) ; Li, Pei-Rong ; Li, Tenglin (Peking U., CHEP) ; Li, Yiming (Orsay, LAL) ; Li, Zhuoming (Syracuse U.) ; Likhomanenko, Tatiana (Kurchatov Inst., Moscow) ; Lindner, Rolf (CERN) ; Lionetto, Federica (Zurich U.) ; Liu, Xuesong (Peking U., CHEP) ; Loh, David (Warwick U.) ; Loi, Angelo (INFN, Cagliari) ; Longstaff, Iain (Glasgow U.) ; Lopes, Jose (Rio de Janeiro Federal U.) ; Lucchesi, Donatella (INFN, Padua ; U. Padua (main)) ; Lucio Martinez, Miriam (U. Santiago de Compostela (main)) ; Luo, Haofei (Edinburgh U.) ; Lupato, Anna (INFN, Padua) ; Luppi, Eleonora (INFN, Ferrara ; Ferrara U.) ; Lupton, Oliver (CERN) ; Lusiani, Alberto (INFN, Pisa) ; Lyu, Xiao-Rui (Beijing, GUCAS) ; Machefert, Frederic (Orsay, LAL) ; Maciuc, Florin (Bucharest, IFIN-HH) ; Macko, Vladimir (Ecole Polytechnique, Lausanne) ; Mackowiak, Patrick (Tech. U., Dortmund (main)) ; Maddrell-Mander, Samuel (Bristol U.) ; Maev, Oleg (St. Petersburg, INP ; CERN) ; Maguire, Kevin (Manchester U.) ; Maisuzenko, Dmitrii (St. Petersburg, INP) ; Majewski, Maciej Witold (AGH-UST, Cracow) ; Malde, Sneha (Oxford U.) ; Malinin, Alexander (Kurchatov Inst., Moscow) ; Maltsev, Timofei (Novosibirsk, IYF ; Novosibirsk State U.) ; Manca, Giulia (INFN, Cagliari ; Cagliari U.) ; Mancinelli, Giampiero (Marseille, CPPM) ; Manning, Peter Michael (Syracuse U.) ; Marangotto, Daniele (INFN, Milan ; U. Milan (main)) ; Maratas, Jan (Clermont-Ferrand U.) ; Marchand, Jean François (Annecy, LAPP) ; Marconi, Umberto (INFN, Bologna) ; Marin Benito, Carla (U. Barcelona (main)) ; Marinangeli, Matthieu (Ecole Polytechnique, Lausanne) ; Marino, Pietro (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Marks, Jörg (Heidelberg U.) ; Martellotti, Giuseppe (INFN, Rome) ; Martin, Morgan (Marseille, CPPM) ; Martinelli, Maurizio (Ecole Polytechnique, Lausanne) ; Martinez Santos, Diego (U. Santiago de Compostela (main)) ; Martinez Vidal, Fernando (Valencia U., IFIC) ; Martins Tostes, Danielle (Rio de Janeiro Federal U.) ; Massacrier, Laure Marie (Orsay, LAL) ; Massafferri, André (Rio de Janeiro, CBPF) ; Matev, Rosen (CERN) ; Mathad, Abhijit (Warwick U.) ; Mathe, Zoltan (CERN) ; Matteuzzi, Clara (INFN, Milan Bicocca) ; Mauri, Andrea (Zurich U.) ; Maurice, Emilie (Orsay, LAL) ; Maurin, Brice (Ecole Polytechnique, Lausanne) ; Mazurov, Alexander (Birmingham U.) ; McCann, Michael (Imperial Coll., London ; CERN) ; McNab, Andrew (Manchester U.) ; McNulty, Ronan (University Coll., Dublin) ; Mead, James Vincent (Liverpool U.) ; Meadows, Brian (Cincinnati U.) ; Meaux, Cedric (Marseille, CPPM) ; Meier, Frank (Tech. U., Dortmund (main)) ; Meinert, Nis (Rostock U.) ; Melnychuk, Dmytro (NCBJ, Swierk) ; Merk, Marcel (NIKHEF, Amsterdam) ; Merli, Andrea (INFN, Milan ; CERN ; U. Milan (main)) ; Michielin, Emanuele (INFN, Padua) ; Milanes, Diego Alejandro (Colombia, U. Natl.) ; Millard, Edward James (Warwick U.) ; Minard, Marie-Noelle (Annecy, LAPP) ; Minzoni, Luca (INFN, Ferrara) ; Mitzel, Dominik Stefan (Heidelberg U.) ; Mogini, Andrea (Paris U., VI-VII) ; Molina Rodriguez, Josue (Rio de Janeiro, CBPF) ; Mombächer, Titus (Tech. U., Dortmund (main)) ; Monroy, Igancio Alberto (Colombia, U. Natl.) ; Monteil, Stephane (Clermont-Ferrand U.) ; Morandin, Mauro (INFN, Padua) ; Morello, Michael Joseph (INFN, Pisa ; Pisa, Scuola Normale Superiore) ; Morgunova, Olga (Kurchatov Inst., Moscow) ; Moron, Jakub (AGH-UST, Cracow) ; Morris, Adam Benjamin (Edinburgh U.) ; Mountain, Raymond (Syracuse U.) ; Muheim, Franz (Edinburgh U.) ; Mulder, Mick (NIKHEF, Amsterdam) ; Mussini, Manuel (INFN, Bologna) ; Müller, Dominik (Manchester U.) ; Müller, Janine (Tech. U., Dortmund (main)) ; Müller, Katharina (Zurich U.) ; Müller, Vanessa (Tech. U., Dortmund (main)) ; Naik, Paras (Bristol U.) ; Nakada, Tatsuya (Ecole Polytechnique, Lausanne) ; Nandakumar, Raja (Rutherford) ; Nandi, Anita (Oxford U.) ; Nasteva, Irina (Rio de Janeiro Federal U.) ; Needham, Matthew (Edinburgh U.) ; Neri, Nicola (INFN, Milan ; CERN) ; Neubert, Sebastian (Heidelberg U.) ; Neufeld, Niko (CERN) ; Neuner, Max (Heidelberg U.) ; Nguyen, Thi Dung (Ecole Polytechnique, Lausanne) ; Nguyen-Mau, Chung (Ecole Polytechnique, Lausanne ; Hanoi U. of Sci.) ; Nieswand, Simon (Aachen, Tech. Hochsch.) ; Niet, Ramon (Tech. U., Dortmund (main)) ; Nikitin, Nikolay (SINP, Moscow) ; Nikodem, Thomas (Heidelberg U.) ; Nogay, Alla (Kurchatov Inst., Moscow) ; O'Hanlon, Daniel Patrick (Warwick U.) ; Oblakowska-Mucha, Agnieszka (AGH-UST, Cracow) ; Obraztsov, Vladimir (Serpukhov, IHEP) ; Ogilvy, Stephen (Frascati) ; Oldeman, Rudolf (INFN, Cagliari ; Cagliari U.) ; Onderwater, Gerco (U. Groningen, VSI) ; Ossowska, Anna (Cracow, INP) ; Otalora Goicochea, Juan Martin (Rio de Janeiro Federal U.) ; Owen, Patrick (Zurich U.) ; Oyanguren, Maria Aranzazu (Valencia U., IFIC) ; Pais, Preema Rennee (Ecole Polytechnique, Lausanne) ; Palano, Antimo (INFN, Bari ; Bari U.) ; Palutan, Matteo (Frascati ; CERN) ; Papanestis, Antonios (Rutherford) ; Pappagallo, Marco (INFN, Bari ; Bari U.) ; Pappalardo, Luciano (INFN, Ferrara ; Ferrara U.) ; Parker, William (Maryland U., College Park) ; Parkes, Christopher (Manchester U.) ; Passaleva, Giovanni (INFN, Florence) ; Pastore, Alessandra (INFN, Bari ; Bari U.) ; Patel, Mitesh (Imperial Coll., London) ; Patrignani, Claudia (INFN, Bologna ; Bologna U.) ; Pearce, Alex (CERN) ; Pellegrino, Antonio (NIKHEF, Amsterdam) ; Penso, Gianni (INFN, Rome) ; Pepe Altarelli, Monica (CERN) ; Perazzini, Stefano (CERN) ; Perret, Pascal (Clermont-Ferrand U.) ; Pescatore, Luca (Ecole Polytechnique, Lausanne) ; Petridis, Konstantinos (Bristol U.) ; Petrolini, Alessandro (INFN, Genoa ; Genoa U.) ; Petrov, Aleksandr (Kurchatov Inst., Moscow) ; Petruzzo, Marco (INFN, Milan ; U. 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U., Dortmund (main)) ; Wislicki, Wojciech (NCBJ, Swierk) ; Witek, Mariusz (Cracow, INP) ; Wormser, Guy (Orsay, LAL) ; Wotton, Stephen (Cambridge U.) ; Wraight, Kenneth (Glasgow U.) ; Wyllie, Kenneth (CERN) ; Xie, Yuehong (CCNU, Wuhan, Inst. Part. Phys.) ; Xu, Zhirui (Annecy, LAPP) ; Yang, Zhenwei (Peking U., CHEP) ; Yang, Zishuo (Maryland U., College Park) ; Yao, Yuezhe (Syracuse U.) ; Yin, Hang (CCNU, Wuhan, Inst. Part. Phys.) ; Yu, Jiesheng (CCNU, Wuhan, Inst. Part. Phys.) ; Yuan, Xuhao (Syracuse U.) ; Yushchenko, Oleg (Serpukhov, IHEP) ; Zarebski, Kristian Alexander (Birmingham U.) ; Zavertyaev, Mikhail (Heidelberg, Max Planck Inst. ; Lebedev Inst.) ; Zhang, Liming (Peking U., CHEP) ; Zhang, Yanxi (Orsay, LAL) ; Zhelezov, Alexey (Heidelberg U.) ; Zheng, Yangheng (Beijing, GUCAS) ; Zhu, Xianglei (Peking U., CHEP) ; Zhukov, Valery (SINP, Moscow) ; Zonneveld, Jennifer Brigitta (Edinburgh U.) ; Zucchelli, Stefano (INFN, Bologna)

Publication 2018-04-26
Imprint 30 Aug 2017
Number of pages 11
Note All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-017.html
In: Phys. Rev. Lett. 120 (2018) 171802
DOI 10.1103/PhysRevLett.120.171802
Subject category hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords electroweak interaction ; flavor physics ; Higgs physics ; B physics ; branching fraction ; tau properties ; conservation law tests
Abstract The ratio of branching fractions ${\cal{R}}(D^{*-})\equiv {\cal{B}}(B^0 \to D^{*-} \tau^+ \nu_{\tau})/{\cal{B}}(B^0 \to D^{*-} \mu^+\nu_{\mu})$ is measured using a data sample of proton-proton collisions collected with the LHCb detector at center-of-mass energies of 7 and 8 Tev, corresponding to an integrated luminosity of 3$ $fb$^{-1}$. For the first time ${\cal{R}}(D^{*-})$ is determined using the $\tau$ lepton decays with three charged pions in the final state. The $B^0 \to D^{*-} \tau^+\nu_{\tau}$ yield is normalized to that of the $B^0\to D^{*-} \pi^+\pi^-\pi^+$ mode, providing a measurement of ${\cal{B}}(B^0\to D^{*-}\tau^+\nu_{\tau})/{\cal{B}}(B^0\to D^{*-}\pi^+\pi^-\pi^+) = 1.97 \pm 0.13 \pm 0.18$, where the first uncertainty is statistical and the second systematic. The value of ${\cal{B}}(B^0 \to D^{*-} \tau^+ \nu_{\tau}) = (1.42 \pm 0.094 \pm 0.129 \pm 0.054)\% $ is obtained, where the third uncertainty is due to the limited knowledge of the branching fraction of the normalization mode. Using the well-measured branching fraction of the $B^0 \to D^{*-} \mu^+\nu_{\mu}$ decay, a value of ${\cal{R}}(D^{*-}) = 0.291 \pm 0.019 \pm 0.026 \pm 0.013$ is established, where the third uncertainty is due to the limited knowledge of the branching fractions of the normalization and $B^0\to D^{*-}\mu^+\nu_{\mu}$ modes. This measurement is in agreement with the Standard Model prediction and with previous results.
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