Search for the lepton-flavour-violating decays $B^{0}_{s}\to\tau^{\pm}\mu^{\mp}$ and $B^{0}\to\tau^{\pm}\mu^{\mp}$

Roel Aaij , Carlos Abellán Beteta , Bernardo Adeva , Marco Adinolfi , Christine Angela Aidala , Ziad Ajaltouni (1) , Simon Akar , Pietro Albicocco , Johannes Albrecht , Federico Alessio , Michael Alexander , Alejandro Alfonso Albero , Georgy Alkhazov , Paula Alvarez Cartelle , Antonio Augusto Alves , Sandra Amato , Yasmine Amhis (2) , Liupan An , Lucio Anderlini , Guido Andreassi , Mirco Andreotti , Jason Andrews , Flavio Archilli , Joan Arnau Romeu (3) , Alexander Artamonov , Marina Artuso , Kenenbek Arzymatov , Elie Aslanides (3) , Michele Atzeni , Benjamin Audurier , Sebastian Bachmann , John Back , Sophie Baker , Vladislav Balagura (2, 4) , Wander Baldini , Alexander Baranov , Roger Barlow , Sergey Barsuk (2) , William Barter , Matteo Bartolini , Fedor Baryshnikov , Varvara Batozskaya , Baasansuren Batsukh , Alexander Battig , Vincenzo Battista , Aurelio Bay , Franco Bedeschi , Ignacio Bediaga , Andrew Beiter , Lennaert Bel , Vladislav Belavin , Samuel Belin , Nikita Beliy , Violaine Bellee , Konstantin Belous , Ivan Belyaev , Giovanni Bencivenni , Eli Ben-Haim (5) , Sean Benson , Sarah Beranek , Alexander Berezhnoy , Roland Bernet , Daniel Berninghoff , Harris Conan Bernstein , Emilie Bertholet (5) , Alessandro Bertolin , Christopher Betancourt , Federico Betti , Marc-Olivier Bettler , Iaroslava Bezshyiko , Srishti Bhasin , Jihyun Bhom , Martin Stefan Bieker , Simone Bifani , Pierre Billoir (5) , Alex Birnkraut , Andrea Bizzeti , Mikkel Bjørn , Michele Piero Blago , Thomas Blake , Frederic Blanc , Steven Blusk , Dana Bobulska , Valerio Bocci , Oscar Boente Garcia , Thomas Boettcher , Alexander Bondar , Nikolay Bondar , Silvia Borghi , Maxim Borisyak , Martino Borsato , Meriem Boubdir , Themistocles Bowcock , Concezio Bozzi , Svende Braun , Alexandre Brea Rodriguez , Michael Brodski , Jolanta Brodzicka , Arnau Brossa Gonzalo , Davide Brundu , Emma Buchanan , Annarita Buonaura , Christopher Burr , Albert Bursche , Jordy Sebastiaan Butter , Jan Buytaert , Wiktor Byczynski , Sandro Cadeddu , Hao Cai , Roberto Calabrese , Stefano Cali , Ryan Calladine , Marta Calvi , Miriam Calvo Gomez , Alessandro Camboni , Pierluigi Campana , Daniel Hugo Campora Perez , Lorenzo Capriotti , Angelo Carbone , Giovanni Carboni , Roberta Cardinale , Alessandro Cardini , Paolo Carniti , Kazuyoshi Carvalho Akiba , Adrian Casais Vidal , Gianluigi Casse , Marco Cattaneo , Giovanni Cavallero , Riccardo Cenci , Matthew George Chapman , Matthew Charles (5) , Philippe Charpentier , Georgios Chatzikonstantinidis , Maximilien Chefdeville (6) , Viktoriia Chekalina , Chen Chen , Shanzhen Chen , Stefan-Gabriel Chitic , Veronika Chobanova , Marcin Chrzaszcz , Alexsei Chubykin , Paolo Ciambrone , Xabier Cid Vidal , Gregory Ciezarek , Federico Cindolo , Peter Clarke , Marco Clemencic , Harry Cliff , Joel Closier , John Leslie Cobbledick , Victor Coco , Joao a B Coelho (2) , Julien Cogan (3) , Eric Cogneras (1) , Lucian Cojocariu , Paula Collins , Tommaso Colombo , Albert Comerma-Montells , Andrea Contu , George Coombs , Samuel Coquereau , Gloria Corti , Cayo Mar Costa Sobral , Benjamin Couturier , Greig Cowan , Daniel Charles Craik , Andrew Crocombe , Melissa Maria Cruz Torres , Robert Currie , Cesar Luiz da Silva , Elena Dall'Occo , Jeremy Dalseno , Carmelo d'Ambrosio , Anna Danilina , Philippe d'Argent , Adam Davis , Oscar de Aguiar Francisco , Kristof de Bruyn , Stefano de Capua , Michel de Cian , Jussara de Miranda , Leandro de Paula , Marilisa de Serio , Patrizia de Simone , Jacco de Vries , Cameron Thomas Dean , William Dean , Daniel Decamp (6) , Luigi del Buono (5) , Blaise Delaney , Hans Peter Dembinski , Moritz Demmer , Adam Dendek , Denis Derkach , Olivier Deschamps (1) , Fabrice Desse (2) , Francesco Dettori , Biplab Dey , Angelo Di Canto , Pasquale Di Nezza , Sergey Didenko , Hans Dijkstra , Francesca Dordei , Mirco Dorigo , Alberto dos Reis , Alvaro Dosil Suárez , Lauren Douglas , Anatoliy Dovbnya , Karlis Dreimanis , Laurent Dufour , Giulio Dujany (5) , Paolo Durante , John Matthew Durham , Deepanwita Dutta , Rustem Dzhelyadin , Michal Dziewiecki , Agnieszka Dziurda , Alexey Dzyuba , Sajan Easo , Ulrik Egede , Victor Egorychev , Semen Eidelman , Stephan Eisenhardt , Ulrich Eitschberger , Robert Ekelhof , Surapat Ek-In , Lars Eklund , Scott Ely , Alexandru Ene , Stephan Escher , Sevda Esen , Timothy Evans , Antonio Falabella , Christian Färber , Nathanael Farley , Stephen Farry , Davide Fazzini (2) , Mauricio Féo , Placido Fernandez Declara , Antonio Fernandez Prieto , Fabio Ferrari , Lino Ferreira Lopes , Fernando Ferreira Rodrigues , Silvia Ferreres Sole , Massimiliano Ferro-Luzzi , Sergey Filippov , Rosa Anna Fini , Massimiliano Fiorini , Miroslaw Firlej , Conor Fitzpatrick , Tomasz Fiutowski , Frederic Fleuret (2, 4) , Marianna Fontana , Flavio Fontanelli , Roger Forty , Vinicius Franco Lima , Manuel Franco Sevilla , Markus Frank , Christoph Frei , Jinlin Fu , Wolfgang Funk , Emmy Gabriel , Abraham Gallas Torreira , Domenico Galli , Stefano Gallorini , Silvia Gambetta , Yuyue Gan , Miriam Gandelman , Paolo Gandini , Yuanning Gao , Luis Miguel Garcia Martin , Julián García Pardiñas , Beatriz Garcia Plana , Jordi Garra Tico , Lluis Garrido , David Gascon , Clara Gaspar , Giulio Gazzoni (1) , David Gerick , Evelina Gersabeck , Marco Gersabeck , Timothy Gershon , Dawid Gerstel (3) , Philippe Ghez (6) , Valerie Gibson , Olivier Göran Girard , Pere Gironella Gironell , Lavinia-Helena Giubega , Konstantin Gizdov , Vladimir Gligorov (5) , Carla Göbel , Dmitry Golubkov , Andrey Golutvin , Alvaro Gomes , Igor Vladimirovich Gorelov , Claudio Gotti , Ekaterina Govorkova , Jascha Peter Grabowski , Ricardo Graciani Diaz , Luis Alberto Granado Cardoso , Eugeni Graugés , Elena Graverini , Giacomo Graziani , Alexandru Grecu , Roman Greim , Peter Griffith , Lucia Grillo , Lukas Gruber , Barak Raimond Gruberg Cazon , Chenxi Gu , Evgeny Gushchin , Andreas Guth , Yury Guz , Thierry Gys , Thomas Hadavizadeh , Christos Hadjivasiliou (1) , Guido Haefeli , Christophe Haen , Susan Haines , Phoebe Meredith Hamilton , Qundong Han , Xiaoxue Han , Thomas Henry Hancock , Stephanie Hansmann-Menzemer , Neville Harnew , Thomas Harrison , Christoph Hasse , Mark Hatch , Jibo He , Malte Hecker , Kevin Heijhoff , Kevin Heinicke , Arno Heister , Karol Hennessy , Louis Henry , Miriam Heß , Johannes Heuel , Adlène Hicheur , Raoul Hidalgo Charman , Donal Hill , Martha Hilton , Plamen Hristov Hopchev , Jiangqiao Hu , Wenhua Hu , Wenqian Huang , Zachary Huard , Wouter Hulsbergen , Thibaud Humair , Mikhail Hushchyn , David Hutchcroft , Daniel Hynds , Philipp Ibis , Marek Idzik , Philip Ilten , Alexander Inglessi , Alexander Inyakin , Kuzma Ivshin , Richard Jacobsson , Sune Jakobsen , Pawel Jalocha , Eddy Jans , Brij Kishor Jashal , Abolhassan Jawahery , Feng Jiang , Malcolm John , Daniel Johnson , Christopher Jones , Christian Joram , Beat Jost , Nathan Jurik , Sergii Kandybei , Matthias Karacson , James Mwangi Kariuki , Sarah Karodia , Nikita Kazeev , Matthieu Kecke , Floris Keizer , Matthew Kelsey , Matthew Kenzie , Tjeerd Ketel , Basem Khanji , Anastasiia Kharisova , Chitsanu Khurewathanakul , Kyung Eun Kim , Thomas Kirn , Veronica Soelund Kirsebom , Suzanne Klaver , Konrad Klimaszewski , Serhii Koliiev , Michael Kolpin , Almagul Kondybayeva , Anatoly Konoplyannikov , Pawel Kopciewicz , Renata Kopecna , Patrick Koppenburg , Igor Kostiuk , Oleksander Kot , Sofia Kotriakhova , Mohamad Kozeiha (1) , Leonid Kravchuk , Michal Kreps , Felix Johannes Kress , Sophie Katharina Kretzschmar , Pavel Krokovny , Wojciech Krupa , Wojciech Krzemien , Wojciech Kucewicz , Marcin Kucharczyk , Vasily Kudryavtsev , Gerd Joachim Kunde , Axel Kevin Kuonen , Tengiz Kvaratskheliya , Daniel Lacarrere , George Lafferty , Adriano Lai , Davide Lancierini , Gaia Lanfranchi , Christoph Langenbruch , Thomas Latham , Cristina Lazzeroni , Renaud Le Gac (3) , Regis Lefèvre (1) , Alexander Leflat , Florian Lemaitre , Olivier Leroy (3) , Tadeusz Lesiak , Blake Leverington , Hengne Li , Pei-Rong Li , Xuan Li , Yiming Li , Zhuoming Li , Xixin Liang , Tatiana Likhomanenko , Rolf Lindner , Federica Lionetto , Vitalii Lisovskyi (2) , Guoming Liu , Xuesong Liu , David Loh , Angelo Loi , Julian Lomba Castro , Iain Longstaff , Jose Lopes , Guillermo Loustau , George Holger Lovell , Donatella Lucchesi , Miriam Lucio Martinez , Yiheng Luo , Anna Lupato , Eleonora Luppi , Oliver Lupton , Alberto Lusiani , Xiao-Rui Lyu , Frederic Machefert (2) , Florin Maciuc , Vladimir Macko , Patrick Mackowiak , Samuel Maddrell-Mander , Oleg Maev , Kevin Maguire , Dmitrii Maisuzenko , Maciej Witold Majewski , Sneha Malde , Bartosz Malecki , Alexander Malinin , Timofei Maltsev , Hanna Malygina , Giulia Manca , Giampiero Mancinelli (3) , Daniele Marangotto , Jan Maratas (1) , Jean François Marchand (6) , Umberto Marconi , Carla Marin Benito (2) , Matthieu Marinangeli , Pietro Marino , Jörg Marks , Phillip John Marshall , Giuseppe Martellotti , Loris Martinazzoli , Maurizio Martinelli , Diego Martinez Santos , Fernando Martinez Vidal , André Massafferri , Marcel Materok , Rosen Matev , Abhijit Mathad , Zoltan Mathe , Viacheslav Matiunin , Clara Matteuzzi , Kara Renee Mattioli , Andrea Mauri , Emilie Maurice (2, 4) , Brice Maurin , Michael Mccann , Andrew Mcnab , Ronan Mcnulty , James Vincent Mead , Brian Meadows , Cedric Meaux (3) , Nis Meinert , Dmytro Melnychuk , Marcel Merk , Andrea Merli , Emanuele Michielin , Diego Alejandro Milanes , Edward James Millard , Marie-Noelle Minard (6) , Oleg Mineev , Luca Minzoni , Dominik Stefan Mitzel , Antje Mödden , Andrea Mogini (5) , Razvan Daniel Moise , Titus Mombächer , Igancio Alberto Monroy , Stephane Monteil (1) , Mauro Morandin , Gianfranco Morello , Michael Joseph Morello , Jakub Moron , Adam Benjamin Morris (3) , Raymond Mountain , Hongjie Mu , Franz Muheim , Maitreyee Mukherjee , Mick Mulder , Dominik Müller , Janine Müller , Katharina Müller , Vanessa Müller , Colm Harold Murphy , Donal Murray , Paras Naik , Tatsuya Nakada , Raja Nandakumar , Anita Nandi , Tara Nanut , Irina Nasteva , Matthew Needham , Nicola Neri , Sebastian Neubert , Niko Neufeld , Ryan Newcombe , Thi Dung Nguyen , Chung Nguyen-Mau , Simon Nieswand , Ramon Niet , Nikolay Nikitin , Niklas Stefan Nolte , Agnieszka Oblakowska-Mucha , Vladimir Obraztsov , Stephen Ogilvy , Daniel Patrick O'Hanlon , Rudolf Oldeman , Gerco Onderwater , Joseph Daniel Osborn , Anna Ossowska , Juan Martin Otalora Goicochea , Tatiana Ovsiannikova , Patrick Owen , Maria Aranzazu Oyanguren , Preema Rennee Pais , Tommaso Pajero , Antimo Palano , Matteo Palutan , Gennady Panshin , Antonios Papanestis , Marco Pappagallo , Luciano Pappalardo , William Parker , Christopher Parkes , Giovanni Passaleva , Alessandra Pastore , Mitesh Patel , Claudia Patrignani , Alex Pearce , Antonio Pellegrino , Gianni Penso , Monica Pepe Altarelli , Stefano Perazzini , Dmitrii Pereima , Pascal Perret (1) , Luca Pescatore , Konstantinos Petridis , Alessandro Petrolini , Aleksandr Petrov , Stefano Petrucci , Marco Petruzzo , Boleslaw Pietrzyk (6) , Guillaume Pietrzyk , Malgorzata Pikies , Martina Pili , Davide Pinci , Jacopo Pinzino , Flavio Pisani , Alessio Piucci , Vlad-Mihai Placinta , Stephen Playfer , Jonathan Plews , Maximo Plo Casasus , Francesco Polci (5) , Marco Poli Lener , Mariia Poliakova , Anton Poluektov (3) , Natalia Polukhina , Ivan Polyakov , Erica Polycarpo , Gabriela Johanna Pomery , Sebastien Ponce , Alexander Popov , Dmitry Popov , Stanislav Poslavskii , Eugenia Price , Claire Prouve , Valery Pugatch , Albert Puig Navarro , Hannah Louise Pullen , Giovanni Punzi , Wenbin Qian , Jia-Jia Qin , Renato Quagliani (5) , Boris Quintana (1) , Naomi Veronika Raab , Bartlomiej Rachwal , Jonas Rademacker , Matteo Rama , Miguel Ramos Pernas , Murilo Rangel , Fedor Ratnikov , Gerhard Raven , Melody Ravonel Salzgeber , Meril Reboud (6) , Federico Redi , Stefanie Reichert , Florian Reiss (5) , Clara Remon Alepuz , Zan Ren , Victor Renaudin , Stefania Ricciardi , Sophie Richards , Kurt Rinnert , Patrick Robbe (2) , Arnaud Robert (5) , Ana Barbara Rodrigues , Eduardo Rodrigues , Jairo Alexis Rodriguez Lopez , Markus Roehrken , Stefan Roiser , Alexandra Paige Rollings , Vladimir Romanovskiy , Antonio Romero Vidal , Jordan Daniel Roth , Marcello Rotondo , Matthew Scott Rudolph , Thomas Ruf , Joan Ruiz Vidal , Juan Jose Saborido Silva , Naylya Sagidova , Biagio Saitta , Valdir Salustino Guimaraes , Cristina Sanchez Gras , Carlos Sanchez Mayordomo , Brais Sanmartin Sedes , Roberta Santacesaria , Cibran Santamarina Rios , Marco Santimaria , Emanuele Santovetti , Gediminas Sarpis , Alessio Sarti , Celestina Satriano , Alessia Satta , Miroslav Saur , Darya Savrina , Stefan Schael , Margarete Schellenberg , Manuel Schiller , Heinrich Schindler , Michael Schmelling , Timon Schmelzer , Burkhard Schmidt , Olivier Schneider , Andreas Schopper , Hf Schreiner , Maxime Schubiger , Sebastian Schulte , Marie Helene Schune (2) , Rainer Schwemmer , Barbara Sciascia , Adalberto Sciubba , Alexander Semennikov , Eduardo Enrique Sepulveda (5) , Antonino Sergi , Nicola Serra , Justine Serrano (3) , Lorenzo Sestini , Alex Seuthe , Paul Seyfert , Mikhail Shapkin , Tara Shears , Lev Shekhtman , Vladimir Shevchenko , Evgenii Shmanin , Benedetto Gianluca Siddi , Rafael Silva Coutinho , Luiz Gustavo Silva de Oliveira , Gabriele Simi , Saverio Simone , Igor Skiba , Nicola Skidmore , Tomasz Skwarnicki , Mark Slater , John Gordon Smeaton , Eluned Smith , Iwan Thomas Smith , Mark Smith , Marcelo Soares , Lais Soares Lavra , Michael Sokoloff , Paul Soler , Bruno Souza de Paula , Bernhard Spaan , Elisabetta Spadaro Norella , Patrick Spradlin , Federico Stagni , Marian Stahl , Sascha Stahl , Pavol Stefko , Slavomira Stefkova , Olaf Steinkamp , Simon Stemmle , Oleg Stenyakin , Margarita Stepanova , Holger Stevens , Sheldon Stone , Simone Stracka , Maria Elena Stramaglia , Mihai Straticiuc , Ulrich Straumann , Sergey Strokov , Jiayin Sun , Liang Sun , Yipeng Sun , Krzysztof Swientek , Adam Szabelski , Tomasz Szumlak , Maciej Pawel Szymanski , Zhipeng Tang , Tobias Tekampe , Giulia Tellarini , Frederic Teubert , Eric Thomas , Matthew James Tilley , Vincent Tisserand (1) , Stephane t'Jampens (6) , Mark Tobin , Siim Tolk , Luca Tomassetti , Diego Tonelli , da Yu Tou (5) , Edwige Tournefier (6) , Murdo Traill , Minh Tâm Tran , Ana Trisovic , Andrei Tsaregorodtsev (3) , Giulia Tuci , Alison Tully , Niels Tuning , Artur Ukleja , Andrii Usachov (2) , Andrey Ustyuzhanin , Ulrich Uwer , Alexander Vagner , Vincenzo Vagnoni , Andrea Valassi , Sebastien Valat , Giovanni Valenti , Martinus van Beuzekom , Hubert van Hecke , Eric van Herwijnen , Charlotte Barbara van Hulse , Jeroen van Tilburg , Maarten van Veghel , Ricardo Vazquez Gomez , Pablo Vazquez Regueiro , Carlos Vázquez Sierra , Stefania Vecchi , Jaap Velthuis , Michele Veltri , Aravindhan Venkateswaran , Maxime Vernet (1) , Michele Veronesi , Mika Vesterinen , Joao Vitor Viana Barbosa , Daniel Vieira , Maria Vieites Diaz , Harald Viemann , Xavier Vilasis-Cardona , Arseniy Vitkovskiy , Marcela Vitti , Vladimir Volkov , Achim Vollhardt , Dorothea Vom Bruch (5) , Balazs Voneki , Alexey Vorobyev , Vitaly Vorobyev , Nikolai Voropaev , Roland Waldi , John Walsh , Jianqiao Wang , Jianchun Wang , Mengzhen Wang , Yilong Wang , Zhenzi Wang , David Ward , Heather Mckenzie Wark , Nigel Watson , David Websdale , Andreas Weiden , Constantin Weisser , Mark Whitehead , Guy Wilkinson , Michael Wilkinson , Ifan Williams , Mike Williams , Mark Richard James Williams , Timothy Williams , Fergus Wilson , Michael Andreas Winn (2) , Wojciech Wislicki , Mariusz Witek , Guy Wormser (2) , Stephen Wotton , Kenneth Wyllie , Zhiyu Xiang , Dong Xiao , Yuehong Xie , Hongxi Xing , Ao Xu , Li Xu , Menglin Xu , Qingnian Xu , Zhirui Xu (6) , Zehua Xu , Zhenwei Yang , Zishuo Yang , Yuezhe Yao , Lauren Emma Yeomans , Hang Yin , Jiesheng Yu , Xuhao Yuan , Oleg Yushchenko , Kristian Alexander Zarebski , Mikhail Zavertyaev , Ming Zeng , Dongliang Zhang , Liming Zhang , Shunan Zhang , Wen Chao Zhang , Yanxi Zhang , Alexey Zhelezov , Yangheng Zheng , Yixiong Zhou , Xianglei Zhu , Valery Zhukov , Jennifer Brigitta Zonneveld , Stefano Zucchelli

1 LPC - Laboratoire de Physique de Clermont
2 LAL - Laboratoire de l'Accélérateur Linéaire
3 CPPM - Centre de Physique des Particules de Marseille
4 LLR - Laboratoire Leprince-Ringuet
5 LPNHE (UMR_7585) - Laboratoire de Physique Nucléaire et de Hautes Énergies
6 LAPP - Laboratoire d'Annecy de Physique des Particules

Results are reported from a search for the rare decays Bs0→τ±μ∓ and B0→τ±μ∓, where the τ lepton is reconstructed in the channel τ-→π-π+π-ντ. These processes are effectively forbidden in the standard model, but they can potentially occur at detectable rates in models of new physics that can induce lepton-flavor-violating decays. The search is based on a data sample corresponding to 3  fb-1 of proton-proton collisions recorded by the LHCb experiment in 2011 and 2012. The event yields observed in the signal regions for both processes are consistent with the expected standard model backgrounds. Because of the limited mass resolution arising from the undetected τ neutrino, the Bs0 and B0 signal regions are highly overlapping. Assuming no contribution from B0→τ±μ∓, the upper limit B(Bs0→τ±μ∓)<4.2×10-5 is obtained at 95% confidence level. If no contribution from Bs0→τ±μ∓ is assumed, a limit of B(B0→τ±μ∓)<1.4×10-5 is obtained at 95% confidence level. These results represent the first limit on B(Bs0→τ±μ∓) and the most stringent limit on B(B0→τ±μ∓).

Keywords: B/s0: rare decay; B0: rare decay; B/s0: leptonic decay; B0: leptonic decay; tau: semileptonic decay; B/s0: branching ratio: upper limit; B0: branching ratio: upper limit; LHC-B; CERN LHC Coll; experimental results; B/s0 --> tau+ muon-; B/s0 --> tau- muon+; B0 --> tau+ muon-; B0 --> tau- muon+; tau --> 2pi- pi+ neutrino/tau; 7000 GeV-cms; 8000 GeV-cms; S042.122; S086.149; Elementary Particles and Fields; p p: scattering; p p: colliding beams

Domains: High Energy Physics - Experiment [hep-ex]

Roel Aaij, Carlos Abellán Beteta, Bernardo Adeva, Marco Adinolfi, Christine Angela Aidala, et al.. Search for the lepton-flavour-violating decays $B^{0}_{s}\to\tau^{\pm}\mu^{\mp}$ and $B^{0}\to\tau^{\pm}\mu^{\mp}$. Phys.Rev.Lett., 2019, 123 (21), pp.211801. ⟨10.1103/PhysRevLett.123.211801⟩. ⟨hal-02148155⟩