Observation of the suppressed decay Λb 0 → pπ − μ + μ −

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Aaij, R, Adeva, B, Adinolfi, M, Ajaltouni, Z, Akar, S, Albrecht, J, Alessio, F, Alexander, M, Ali, S, Alkhazov, G et al (show 89 more authors) , 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, d’Argent, P, Arnau Romeu, J, Artamonov, A, Artuso, M, Aslanides, E, Auriemma, G, Baalouch, M, Babuschkin, I, Bachmann, S, Back, JJ, Badalov, A, Baesso, C, Baker, S, Baldini, W, Barlow, RJ, Barschel, C, Barsuk, S, Barter, W, Baszczyk, M, Batozskaya, V, Batsukh, B, Battista, V, Bay, A, Beaucourt, L, Beddow, J, Bedeschi, F, Bediaga, I, Bel, LJ, Bellee, V, Belloli, N, Belous, K, Belyaev, I, Ben-Haim, E, Bencivenni, G, Benson, S, Benton, J, Berezhnoy, A, Bernet, R, Bertolin, A, Betancourt, C, Betti, F, Bettler, MO, van Beuzekom, M, Bezshyiko, I, Bifani, S, Billoir, P, Bird, T, Birnkraut, A, Bitadze, A, Bizzeti, A, Blake, T, Blanc, F, Blouw, J, Blusk, S, Bocci, V, Boettcher, T, Bondar, A, Bondar, N, Bonivento, W, Bordyuzhin, I, Borgheresi, A, Borghi, S, Borisyak, M, Borsato, M, Bossu, F, Boubdir, M, Bowcock, TJV ORCID: 0000-0002-3505-6915, Bowen, E, Bozzi, C, Braun, S, Britsch, M, Britton, T, Brodzicka, J, Buchanan, E, Burr, C, Bursche, A and Buytaert, J (2017) Observation of the suppressed decay Λb 0 → pπ − μ + μ − Journal of High Energy Physics, 2017 (4). ISSN 1126-6708, 1029-8479

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Abstract

The suppressed decay Λ<inf>b</inf> ⁰ → pπ⁻μ⁺μ⁻, excluding the J/ψ and ψ(2S) → μ⁺μ⁻ resonances, is observed for the first time with a significance of 5.5 standard deviations. The analysis is performed with proton-proton collision data corresponding to an integrated luminosity of 3 fb⁻¹ collected with the LHCb experiment. The Λ<inf>b</inf> ⁰ → pπ⁻μ⁺μ⁻ branching fraction is measured relative to the Λ<inf>b</inf> ⁰ → J/ψ(→μ⁺μ⁻)pπ⁻ branching fraction givingℬ(Λb0→pπ−μ+μ−)ℬ(Λb0→J/ψ(→μ+μ−)pπ−)=0.044±0.012±0.007, where the first uncertainty is statistical and the second is systematic. This is the first observation of a b → d transition in a baryonic decay.[Figure not available: see fulltext.]

Item Type:	Article
Uncontrolled Keywords:	B physics, Branching fraction, Flavour Changing Neutral Currents, Hadron-Hadron scattering (experiments), Rare decay
Depositing User:	Symplectic Admin
Date Deposited:	04 May 2017 11:42
Last Modified:	22 Jan 2026 02:38
DOI:	10.1007/JHEP04(2017)029
Open Access URL:	https://arxiv.org/pdf/1701.08705.pdf
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3007245
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