Search for the Λ_b⁰ → Λη′ and Λ_b⁰ → Λη decays with the LHCb detector

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Aaij, R, Adeva, B, Adinolfi, M, Affolder, A, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S et al (show 710 more authors) , Alkhazov, G, Cartelle, P Alvarez, Alves, AA Jr, Amato, S, Amerio, S, Amhis, Y, An, L, Anderlini, L, Anderson, J, Andreotti, M, Andrews, JE, Appleby, RB, Gutierrez, O Aquines, Archilli, F, d'Argent, P, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Batozskaya, V, Battista, V, Bay, A, Beaucourt, L, Beddow, J, Bedeschi, F, Bediaga, I, Bel, LJ, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Benton, J, Berezhnoy, A, Bernet, R, Bertolin, A, Bettler, M-O, van Beuzekom, M, Bien, A, Bifani, S, Bird, T, Birnkraut, A, Bizzeti, A, Blake, T, Blanc, F, Blouw, J, Blusk, S, Bocci, V, Bondar, A, Bondar, N, Bonivento, W, Borghi, S, Borsato, M, Bowcock, TJV ORCID: 0000-0002-3505-6915, Bowen, E, Bozzi, C, Braun, S, Brett, D, Britsch, M, 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Gavardi, L, Gazzoni, G, Geraci, A, Gerick, D, Gersabeck, E, Gersabeck, M, Gershon, T, Ghez, Ph, Gianelle, A, Giani, S, Gibson, V, Girard, OG, Giubega, L, Gligorov, VV, Goebel, C, Golubkov, D, Golutvin, A, Gomes, A, Gotti, C, Gandara, M Grabalosa, Graciani Diaz, R, Cardoso, LA Granado, Grauges, E, Graverini, E, Graziani, G, Grecu, A, Greening, E, Gregson, S, Griffith, P, Grillo, L, Gruenberg, O, Gui, B, Gushchin, E, Guz, Yu, Gys, T, Hadjivasiliou, C, Haefeli, G, Haen, C, Haines, SC, Hall, S, Hamilton, B, Hampson, T, Han, X, Hansmann-Menzemer, S, Harnew, N, Harnew, ST, Harrison, J, He, J, Head, T, Heijne, V, Hennessy, K ORCID: 0000-0002-1529-8087, Henrard, P, Henry, L, Hernando Morata, JA, van Herwijnen, E, Hess, M, Hicheur, A, Hill, D, Hoballah, M, Hombach, C, Hulsbergen, W, Humair, T, Hussain, N, Hutchcroft, D ORCID: 0000-0002-4174-6509, Hynds, D, Idzik, M, Ilten, P, Jacobsson, R, Jaeger, A, Jalocha, J, Jans, E, Jawahery, A, Jing, F, John, M, Johnson, D, Jones, CR, Joram, C, Jost, B, Jurik, N, Kandybei, S, Kanso, W, Karacson, M, Karbach, TM, Karodia, S, Kelsey, M, Kenyon, IR, Kenzie, M, Ketel, T, Khanji, B, Khurewathanakul, C, Klaver, S, Klimaszewski, K, Kochebina, O, Kolpin, M, Komarov, I, Koopman, RF, Koppenburg, P, Korolev, M, Kravchuk, L, Kreplin, K, Kreps, M, Krocker, G, Krokovny, P, Kruse, F, Kucewicz, W, Kucharczyk, M, Kudryavtsev, V, Kuonen, AK, Kurek, K, Kvaratskheliya, T, La Thi, VN, Lacarrere, D, Lafferty, G, Lai, A, Lambert, D, Lambert, RW, Lanfranchi, G, Langenbruch, C, Langhans, B, Latham, T, Lazzeroni, C, Le Gac, R, van Leerdam, J, Lees, J-P, Lefevre, R, Leflat, A, Lefrancois, J, Leroy, O, Lesiak, T, Leverington, B, Li, Y, Likhomanenko, T, Liles, M, Lindner, R, Linn, C, Lionetto, F, Liu, B, Liu, X, Lohn, S, Longstaff, I, Lopes, JH, Lucchesir, D, Lucio Martinez, M, Luo, H, Lupato, A, Luppi, E, Lupton, O, Machefert, F, Maciuc, F, Maev, O, Maguire, K, Malde, S, Malinin, A, Manca, G, Mancinelli, G, Manning, P, Mapelli, A, Maratas, J, Marchand, JF, 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Williams, M, Williams, T, Wilson, FF, Wimberley, J, Wishahi, J, Wislicki, W, Witek, M, Wormser, G, Wotton, SA, Wright, S, Wyllie, K, Xie, Y, Xu, Z, Yang, Z, Yu, J, Yuan, X, Yushchenko, O, Zangoli, M, Zavertyaev, M, Zhang, L, Zhang, Y, Zhelezov, A, Zhokhov, A and Zhong, L (2015) Search for the Λ_b⁰ → Λη′ and Λ_b⁰ → Λη decays with the LHCb detector JOURNAL OF HIGH ENERGY PHYSICS, 2015 (9). 006-. ISSN 1126-6708, 1029-8479

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Abstract

A search is performed for the as yet unobserved baryonic Λ<inf>b</inf>⁰ → Λη ′ and Λ<inf>b</inf>⁰ → Λη decays with 3 fb⁻¹ of proton-proton collision data recorded by the LHCb experiment. The B⁰ → K<inf>s</inf>⁰η ′ decay is used as a normalisation channel. No significant signal is observed for the Λ<inf>b</inf>⁰ → Λη ′ decay. An upper limit is found on the branching fraction of ℬΛb0→Λη′ < 3.1 × 10⁻⁶ at 90% confidence level. Evidence is seen for the presence of the Λ<inf>b</inf>⁰ → Λη decay at the level of 3σ significance, with a branching fraction (Formula presented.).

Item Type:	Article
Additional Information:	22 pages, 6 figures. v2 is published version (very minor revisions)
Uncontrolled Keywords:	Hadron-Hadron Scattering, B physics, Flavor physics
Depositing User:	Symplectic Admin
Date Deposited:	08 Jul 2016 09:13
Last Modified:	16 Jun 2026 12:29
DOI:	10.1007/JHEP09(2015)006
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3002188
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