Improved limit on the branching fraction of the rare decay ${{K} ^0_{\mathrm { \scriptscriptstyle S}}} \rightarrow \mu ^+\mu ^-$

Roel Aaij Bernardo Adeva Marco Adinolfi Ziad Ajaltouni 1 Simon Akar Johannes Albrecht Federico Alessio Michael Alexander Suvayu Ali Georgy Alkhazov Paula Alvarez Cartelle Antonio Augusto Alves Sandra Amato Silvia Amerio Yasmine Amhis 2 Liupan An Lucio Anderlini Guido Andreassi Mirco Andreotti Jason Andrews Robert Appleby Flavio Archilli Philippe d'Argent Joan Arnau Romeu 3 Alexander Artamonov Marina Artuso Elie Aslanides 3 Giulio Auriemma Marouen Baalouch 1 Igor Babuschkin Sebastian Bachmann John Back Alexey Badalov Clarissa Baesso Sophie Baker Vladislav Balagura 2 Wander Baldini Alexander Baranov Roger Barlow Colin Barschel Sergey Barsuk 2 William Barter Fedor Baryshnikov Maxim Borisyak Varvara Batozskaya Vincenzo Battista Aurelio Bay Leo Beaucourt 4 John Beddow Franco Bedeschi Ignacio Bediaga Andrew Beiter Lennaert Bel Violaine Bellee Nicoletta Belloli Konstantin Belous Ivan Belyaev Eli Ben-Haim 5 Giovanni Bencivenni Sean Benson Sarah Beranek Alexander Berezhnoy Roland Bernet Alessandro Bertolin Christopher Betancourt Federico Betti Marc-Olivier Bettler Martinus van Beuzekom Iaroslava Bezshyiko Simone Bifani Pierre Billoir 5 Alex Birnkraut Alexander Bitadze Andrea Bizzeti Thomas Blake Frederic Blanc Johan Blouw Steven Blusk Valerio Bocci Thomas Boettcher Alexander Bondar Nikolay Bondar Walter Bonivento Igor Bordyuzhin Alessio Borgheresi Silvia Borghi Alessandro Camboni Martino Borsato Francesco Bossu 2 Meriem Boubdir Themistocles Bowcock Espen Eie Bowen Concezio Bozzi Svende Braun Thomas Britton Jolanta Brodzicka Emma Buchanan Christopher Burr Albert Bursche Jan Buytaert Sandro Cadeddu Roberto Calabrese Marta Calvi Miriam Calvo Gomez Lorenzo Cassina Pierluigi Campana Daniel Hugo Campora Perez Lorenzo Capriotti Angelo Carbone Giovanni Carboni Roberta Cardinale Alessandro Cardini Paolo Carniti Laurence Carson Kazuyoshi Carvalho Akiba Gianluigi Casse Paolo Ciambrone Lucia Castillo Garcia Marco Cattaneo Giovanni Cavallero Riccardo Cenci David Chamont 2 Matthew Charles 5 Philippe Charpentier Georgios Chatzikonstantinidis Maximilien Chefdeville 4 Shanzhen Chen Shu Faye Cheung Veronika Chobanova Marcin Chrzaszcz Alexsei Chubykin Xabier Cid Vidal Gregory Ciezarek Peter Clarke Marco Clemencic Harry Cliff Joel Closier Victor Coco Julien Cogan 3 Eric Cogneras 1 Violetta Cogoni Lucian Cojocariu Paula Collins Albert Comerma-Montells Andrea Contu Andrew Cook George Coombs Samuel Coquereau Gloria Corti Marco Corvo Cayo Mar Costa Sobral Benjamin Couturier Greig Cowan Daniel Charles Craik Andrew Crocombe Melissa Maria Cruz Torres Robert Currie Carmelo d'Ambrosio Franciole da Cunha Marinho Elena Dall'Occo Jeremy Dalseno Adam Davis Kristof de Bruyn 3 Stefano de Capua Michel de Cian Jussara de Miranda Leandro de Paula Marilisa de Serio Patrizia de Simone Cameron Thomas Dean Daniel Decamp 4 Mirko Deckenhoff Luigi del Buono 5 Hans Peter Dembinski Moritz Demmer Adam Dendek Denis Derkach Olivier Deschamps 1 Francesco Dettori Biplab Dey Angelo Di Canto Pasquale Di Nezza Hans Dijkstra Francesca Dordei Mirco Dorigo Alvaro Dosil Suárez Anatoliy Dovbnya Karlis Dreimanis Laurent Dufour Giulio Dujany Kevin Dungs Paolo Durante Rustem Dzhelyadin Michal Dziewiecki Agnieszka Dziurda Alexey Dzyuba Nicolas Déléage 4 Sajan Easo Marcus Ebert Ulrik Egede Victor Egorychev Semen Eidelman Stephan Eisenhardt Ulrich Eitschberger Robert Ekelhof Lars Eklund Scott Ely Sevda Esen Hannah Mary Evans Timothy Evans Antonio Falabella Nathanael Farley Stephen Farry Robert Fay Davide Fazzini Dianne Ferguson Gerard Fernandez Antonio Fernandez Prieto Fabio Ferrari Fernando Ferreira Rodrigues Massimiliano Ferro-Luzzi Sergey Filippov Rosa Anna Fini Marco Fiore Massimiliano Fiorini Miroslaw Firlej Conor Fitzpatrick Tomasz Fiutowski Frederic Fleuret 2 Klaus Fohl Marianna Fontana Flavio Fontanelli Dean Charles Forshaw Roger Forty Vinicius Franco Lima Markus Frank Christoph Frei Jinlin Fu Wolfgang Funk Emiliano Furfaro Christian Färber Abraham Gallas Torreira Domenico Galli 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Swientek Vasileios Syropoulos Marek Szczekowski Tomasz Szumlak Stephane t'Jampens 4 Andrey Tayduganov 3 Tobias Tekampe Giulia Tellarini Frederic Teubert Eric Thomas Jeroen van Tilburg Matthew James Tilley Vincent Tisserand 4 Mark Tobin Siim Tolk Luca Tomassetti Diego Tonelli Andrey Ustyuzhanin Francis Toriello Rafael Tourinho Jadallah Aoude Edwige Tournefier 4 Stephane Tourneur Karim Trabelsi Murdo Traill Daniel Vieira Marco Tresch Ana Trisovic Andrei Tsaregorodtsev 3 Panagiotis Tsopelas Alison Tully Christian Voß Artur Ukleja Carlos Vázquez Sierra Ulrich Uwer Claudia Vacca Vincenzo Vagnoni Andrea Valassi Sebastien Valat Giovanni Valenti Ricardo Vazquez Gomez Pablo Vazquez Regueiro Stefania Vecchi Maarten van Veghel Jaap Velthuis Michele Veltri Giovanni Veneziano Aravindhan Venkateswaran Tobias Anton Verlage Maxime Vernet 1 Mika Vesterinen Joao Vitor Viana Barbosa Benoit Viaud 2 Maria Vieites Diaz Harald Viemann Xavier Vilasis-Cardona Marcela Vitti Vladimir Volkov Achim Vollhardt Balazs Voneki Alexey Vorobyev Vitaly Vorobyev Jacco de Vries Roland Waldi Charlotte Wallace Ronan Wallace John Walsh Jianchun Wang David Ward Heather Mckenzie Wark Nigel Watson David Websdale Andreas Weiden Mark Whitehead Jean Wicht Guy Wilkinson Michael Wilkinson Mark Richard James Williams Matthew Williams Mike Williams Timothy Williams Fergus Wilson Jack Wimberley Michael Andreas Winn 2 Julian Wishahi Wojciech Wislicki Mariusz Witek Guy Wormser 2 Stephen Wotton Kenneth Wraight Kenneth Wyllie Yuehong Xie Zhirui Xu 4 Zhenwei Yang Zishuo Yang Yuezhe Yao Hang Yin Jiesheng Yu Xuhao Yuan Oleg Yushchenko Kristian Alexander Zarebski Mikhail Zavertyaev Liming Zhang Yanxi Zhang 2 Alexey Zhelezov Yangheng Zheng Xianglei Zhu Valery Zhukov Stefano Zucchelli
Abstract : A search for the decay ${{K} ^0_{\mathrm { \scriptscriptstyle S}}} \rightarrow \mu ^+\mu ^-$ is performed, based on a data sample of proton-proton collisions corresponding to an integrated luminosity of $3\,\text{ fb }^{-1} $ , collected by the LHCb experiment at centre-of-mass energies of 7 and 8 $\mathrm {\,TeV}$ . The observed yield is consistent with the background-only hypothesis, yielding a limit on the branching fraction of $\mathcal{B}({{K} ^0_{\mathrm { \scriptscriptstyle S}}} \rightarrow \mu ^+\mu ^-) < 0.8~(1.0) \times 10^{-9}$ at $90\%~(95\%)$ confidence level. This result improves the previous upper limit on the branching fraction by an order of magnitude.
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Submitted on : Thursday, November 23, 2017 - 10:36:34 AM
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Roel Aaij, Bernardo Adeva, Marco Adinolfi, Ziad Ajaltouni, Simon Akar, et al.. Improved limit on the branching fraction of the rare decay ${{K} ^0_{\mathrm { \scriptscriptstyle S}}} \rightarrow \mu ^+\mu ^-$. Eur.Phys.J.C, 2017, 77 (10), pp.678. ⟨10.1140/epjc/s10052-017-5230-x⟩. ⟨hal-01645701⟩

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