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

• Published in: The journal of high energy physics 2018-03, Vol.3
• Main Authors: Aaij, Roel, Adeva, Bernardo, Adinolfi, Marco, Ajaltouni, Ziad, Akar, Simon, Albrecht, Johannes, Alessio, Federico, Alexander, Michael, Alfonso Albero, Alejandro, Ali, Suvayu, Alkhazov, Georgy, Alvarez Cartelle, Paula, Alves, Antonio Augusto, Amato, Sandra, Amerio, Silvia, Amhis, Yasmine, An, Liupan, Anderlini, Lucio, Andreassi, Guido, Andreotti, Mirco, Andrews, Jason, Appleby, Robert, Archilli, Flavio, d'Argent, Philippe, Arnau Romeu, Joan, Artamonov, Alexander, Artuso, Marina, Aslanides, Elie, Atzeni, Michele, Auriemma, Giulio, Baalouch, Marouen, Babuschkin, Igor, Bachmann, Sebastian, Back, John, Badalov, Alexey, Baesso, Clarissa, Baker, Sophie, Balagura, Vladislav, Baldini, Wander, Baranov, Alexander, Barlow, Roger, Barschel, Colin, Barsuk, Sergey, Barter, William, Baryshnikov, Fedor, Batozskaya, Varvara, Battista, Vincenzo, Bay, Aurelio, Beaucourt, Leo, Beddow, John, Bedeschi, Franco, Bediaga, Ignacio, Beiter, Andrew, Bel, Lennaert, Beliy, Nikita, Bellee, Violaine, Belloli, Nicoletta, Belous, Konstantin, Belyaev, Ivan, Ben-Haim, Eli, Bencivenni, Giovanni, Benson, Sean, Beranek, Sarah, Berezhnoy, Alexander, Bernet, Roland, Berninghoff, Daniel, Bertholet, Emilie, Bertolin, Alessandro, Betancourt, Christopher, Betti, Federico, Bettler, Marc-Olivier, van Beuzekom, Martinus, Bezshyiko, Iaroslava, Bifani, Simone, Billoir, Pierre, Birnkraut, Alex, Bizzeti, Andrea, Bjørn, Mikkel, Blake, Thomas, Blanc, Frederic, Blusk, Steven, Bocci, Valerio, Boettcher, Thomas, Bondar, Alexander, Bondar, Nikolay, Bordyuzhin, Igor, Borgheresi, Alessio, Borghi, Silvia, Borisyak, Maxim, Borsato, Martino, Bossu, Francesco, Boubdir, Meriem, Bowcock, Themistocles, Bowen, Espen Eie, Bozzi, Concezio, Braun, Svende, Britton, Thomas, Brodzicka, Jolanta, Brundu, Davide, Buchanan, Emma
• Format: Article
• Language: English
• Subjects: High Energy Physics - Experiment; Physics
• ISSN: 1126-6708; 1029-8479
• DOI: 10.1007/JHEP03(2018)078

A search for the lepton-flavour violating decays B$_{s}^{0}$  → e$^{±}$μ$^{∓}$ and B$^{0}$ → e$^{±}$μ$^{∓}$ is performed based on a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb$^{−1}$, collected with the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The observed yields are consistent with the background-only hypothesis. Upper limits on the branching fraction of the B$_{s}^{0}$  → e$^{±}$μ$^{∓}$ decays are evaluated both in the hypotheses of an amplitude completely dominated by the heavy eigenstate and by the light eigenstate. The results are $ \frac{@}{@}\mathrm{\mathcal{B}}\left({B}_s^0\to {e}^{\pm }{\mu}^{\mp}\right)