Search for the lepton-flavour violating decays B0( s) → e±μ∓

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Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Alfonso Albero, A, Ali, S et al (show 793 more authors) , Alkhazov, G, Alvarez Cartelle, P, Alves, AA, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Andreassi, G, Andreotti, M, Andrews, JE, Appleby, RB, Archilli, F ORCID: 0000-0002-1779-6813, d’Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Aslanides, E, Atzeni, M, Auriemma, G, Baalouch, M, Babuschkin, I, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baker, S, Balagura, V, Baldini, W, Baranov, A, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Baryshnikov, F, Batozskaya, V, Battista, V, Bay, A, Beaucourt, L, Beddow, J, Bedeschi, F, Bediaga, I, Beiter, A, Bel, LJ, Beliy, N, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Beranek, S, Berezhnoy, A, Bernet, R, Berninghoff, D, Bertholet, E, Bertolin, A, Betancourt, C, Betti, F, Bettler, M-O, van Beuzekom, M, Bezshyiko, Ia, Bifani, S, Billoir, P, 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Haen, C, Haines, SC, Hamilton, B, Han, X, Hancock, TH, Hansmann-Menzemer, S, Harnew, N, Harnew, ST, Hasse, C, Hatch, M, He, J, Hecker, M, Heinicke, K, Heister, A, Hennessy, K ORCID: 0000-0002-1529-8087, Henrard, P, Henry, L, van Herwijnen, E, Heß, M, Hicheur, A, Hill, D, Hombach, C, Hopchev, PH, Hu, W, Huard, ZC, Hulsbergen, W, Humair, T, Hushchyn, M, Hutchcroft, D ORCID: 0000-0002-4174-6509, Ibis, P, Idzik, M, Ilten, P, Jacobsson, R, Jalocha, J, Jans, E, Jawahery, A, Jiang, F, John, M, Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kandybei, S, Karacson, M, Kariuki, JM, Karodia, S, Kazeev, N, Kecke, M, Keizer, F, Kelsey, M, Kenzie, M, Ketel, T, Khairullin, E, Khanji, B, Khurewathanakul, C, Kirn, T, Klaver, S, Klimaszewski, K, Klimkovich, T, Koliiev, S, Kolpin, M, Komarov, I, Kopecna, R, Koppenburg, P, Kosmyntseva, A, Kotriakhova, S, Kozeiha, M, Kravchuk, L, Kreps, M, Kress, F, Krokovny, P, Kruse, F, Krzemien, W, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kuonen, AK, Kvaratskheliya, T, Lacarrere, D, Lafferty, G, Lai, A, Lanfranchi, G, Langenbruch, C, Latham, T, Lazzeroni, C, Le Gac, R, Leflat, A, Lefrançois, J, Lefèvre, R, Lemaitre, F, Lemos Cid, E, Leroy, O, Lesiak, T, Leverington, B, Li, P-R, Li, T, Li, Y, Li, Z, Likhomanenko, T, Lindner, R, Lionetto, F, Lisovskyi, V, Liu, X, Loh, D, Loi, A, Longstaff, I, Lopes, JH, Lucchesi, D, Lucio Martinez, M, Luo, H, Lupato, A, Luppi, E, Lupton, O, Lusiani, A, Lyu, X, Machefert, F, Maciuc, F, Macko, V, Mackowiak, P, Maddrell-Mander, S, Maev, O, Maguire, K, Maisuzenko, D, Majewski, MW, Malde, S, Malecki, B, Malinin, A, Maltsev, T, Manca, G, Mancinelli, G, Marangotto, D, Maratas, J, Marchand, JF, Marconi, U, Marin Benito, C, Marinangeli, M, Marino, P, Marks, J, Martellotti, G, Martin, M, Martinelli, M, Martinez Santos, D, Martinez Vidal, F, Martins Tostes, D, Massacrier, LM, Massafferri, A, Matev, R, Mathad, A, Mathe, Z, Matteuzzi, C, Mauri, A, Maurice, E, Maurin, B, Mazurov, A, McCann, M, McNab, A, McNulty, 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Journal of High Energy Physics, 2018 (3).

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Abstract

<jats:title>A<jats:sc>bstract</jats:sc> </jats:title> <jats:p>A search for the lepton-flavour violating decays <jats:italic>B</jats:italic> <jats:sub> <jats:italic>s</jats:italic> </jats:sub> <jats:sup>0</jats:sup>  → <jats:italic>e</jats:italic> <jats:sup>±</jats:sup> <jats:italic>μ</jats:italic> <jats:sup>∓</jats:sup> and <jats:italic>B</jats:italic> <jats:sup>0</jats:sup> → <jats:italic>e</jats:italic> <jats:sup>±</jats:sup> <jats:italic>μ</jats:italic> <jats:sup>∓</jats:sup> is performed based on a sample of proton-proton collision data corresponding to an integrated luminosity of 3 fb<jats:sup>−1</jats:sup>, 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 <jats:italic>B</jats:italic> <jats:sub> <jats:italic>s</jats:italic> </jats:sub> <jats:sup>0</jats:sup>  → <jats:italic>e</jats:italic> <jats:sup>±</jats:sup> <jats:italic>μ</jats:italic> <jats:sup>∓</jats:sup> decays are evaluated both in the hypotheses of an amplitude completely dominated by the heavy eigenstate and by the light eigenstate. The results are <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \frac{@}{@}\mathrm{\mathcal{B}}\left({B}_s^0\to {e}^{\pm }{\mu}^{\mp}\right)&lt;6.3(5.4)\times 1{0}^{-9} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:mo>@</mml:mo> <mml:mo>@</mml:mo> </mml:mfrac> <mml:mi>ℬ</mml:mi> <mml:mfenced> <mml:mrow> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>∓</mml:mo> </mml:msup> </mml:mrow> </mml:mfenced> <mml:mo>&lt;</mml:mo> <mml:mn>6.3</mml:mn> <mml:mfenced> <mml:mn>5.4</mml:mn> </mml:mfenced> <mml:mo>×</mml:mo> <mml:mn>1</mml:mn> <mml:msup> <mml:mn>0</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>9</mml:mn> </mml:mrow> </mml:msup> </mml:math> </jats:alternatives> </jats:inline-formula> and <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \frac{@}{@}\mathrm{\mathcal{B}}\left({B}_s^0\to {e}^{\pm }{\mu}^{\mp}\right)&lt;7.2(6.0)\times 1{0}^{-9} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:mo>@</mml:mo> <mml:mo>@</mml:mo> </mml:mfrac> <mml:mi>ℬ</mml:mi> <mml:mfenced> <mml:mrow> <mml:msubsup> <mml:mi>B</mml:mi> <mml:mi>s</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>∓</mml:mo> </mml:msup> </mml:mrow> </mml:mfenced> <mml:mo>&lt;</mml:mo> <mml:mn>7.2</mml:mn> <mml:mfenced> <mml:mn>6.0</mml:mn> </mml:mfenced> <mml:mo>×</mml:mo> <mml:mn>1</mml:mn> <mml:msup> <mml:mn>0</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>9</mml:mn> </mml:mrow> </mml:msup> </mml:math> </jats:alternatives> </jats:inline-formula> at 95% (90%) confidence level, respectively. The upper limit on the branching fraction of the <jats:italic>B</jats:italic> <jats:sup>0</jats:sup> → <jats:italic>e</jats:italic> <jats:sup>±</jats:sup> <jats:italic>μ</jats:italic> <jats:sup>∓</jats:sup> decay is also evaluated, obtaining <jats:inline-formula> <jats:alternatives> <jats:tex-math>$$ \frac{@}{@}\mathrm{\mathcal{B}}\left({B}^0\to {e}^{\pm }{\mu}^{\mp}\right)&lt;1.3(1.0)\times 1{0}^{-9} $$</jats:tex-math> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mfrac> <mml:mo>@</mml:mo> <mml:mo>@</mml:mo> </mml:mfrac> <mml:mi>ℬ</mml:mi> <mml:mfenced> <mml:mrow> <mml:msup> <mml:mi>B</mml:mi> <mml:mn>0</mml:mn> </mml:msup> <mml:mo>→</mml:mo> <mml:msup> <mml:mi>e</mml:mi> <mml:mo>±</mml:mo> </mml:msup> <mml:msup> <mml:mi>μ</mml:mi> <mml:mo>∓</mml:mo> </mml:msup> </mml:mrow> </mml:mfenced> <mml:mo>&lt;</mml:mo> <mml:mn>1.3</mml:mn> <mml:mfenced> <mml:mn>1.0</mml:mn> </mml:mfenced> <mml:mo>×</mml:mo> <mml:mn>1</mml:mn> <mml:msup> <mml:mn>0</mml:mn> <mml:mrow> <mml:mo>−</mml:mo> <mml:mn>9</mml:mn> </mml:mrow> </mml:msup> </mml:math> </jats:alternatives> </jats:inline-formula> at 95% (90%) confidence level. These are the strongest limits on these decays to date. </jats:p>

Item Type:	Article
Depositing User:	Symplectic Admin
Date Deposited:	23 Apr 2018 07:34
Last Modified:	19 Jan 2023 06:35
DOI:	10.1007/jhep03(2018)078
Related URLs:	Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3020503