Searches for B0 →k+π-τ+τ- and Bs0 →k+K-τ+τ- Decays

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Aaij, R ORCID: 0000-0003-0533-1952, Abdelmotteleb, ASW ORCID: 0000-0001-7905-0542, Abellan Beteta, C ORCID: 0009-0009-0869-6798, Abudinén, F ORCID: 0000-0002-6737-3528, Ackernley, T ORCID: 0000-0002-5951-3498, Adefisoye, AA ORCID: 0000-0003-2448-1550, Adeva, B ORCID: 0000-0001-9756-3712, Adinolfi, M ORCID: 0000-0002-1326-1264, Adlarson, P ORCID: 0000-0001-6280-3851, Agapopoulou, C ORCID: 0000-0002-2368-0147 et al (show 90 more authors) , Aidala, CA ORCID: 0000-0001-9540-4988, Ajaltouni, Z, Akar, S ORCID: 0000-0003-0288-9694, Akiba, K ORCID: 0000-0002-6736-471X, Akthar, M ORCID: 0009-0003-3172-2997, Albicocco, P ORCID: 0000-0001-6430-1038, Albrecht, J ORCID: 0000-0001-8636-1621, Aleksiejunas, R ORCID: 0000-0002-9093-2252, Alessio, F ORCID: 0000-0001-5317-1098, Alvarez Cartelle, P ORCID: 0000-0003-1652-2834, Amalric, R ORCID: 0000-0003-4595-2729, Amato, S ORCID: 0000-0002-3277-0662, Amey, JL ORCID: 0000-0002-2597-3808, Amhis, Y ORCID: 0000-0003-4282-1512, An, L ORCID: 0000-0002-3274-5627, Anderlini, L ORCID: 0000-0001-6808-2418, Andersson, M ORCID: 0000-0003-3594-9163, Andreola, P ORCID: 0000-0002-3923-431X, Andreotti, M ORCID: 0000-0003-2918-1311, Andres Estrada, S ORCID: 0009-0004-1572-0964, Anelli, A ORCID: 0000-0002-6191-934X, Ao, D ORCID: 0000-0003-1647-4238, Arata, C ORCID: 0009-0002-1990-7289, Archilli, F ORCID: 0000-0002-1779-6813, Areg, Z ORCID: 0009-0001-8618-2305, Argenton, M ORCID: 0009-0006-3169-0077, Arguedas Cuendis, S ORCID: 0000-0003-4234-7005, Arnone, L ORCID: 0009-0008-2154-8493, Artamonov, A ORCID: 0000-0002-2785-2233, Artuso, M ORCID: 0000-0002-5991-7273, Aslanides, E ORCID: 0000-0003-3286-683X, Ataíde Da Silva, R ORCID: 0009-0005-1667-2666, Atzeni, M ORCID: 0000-0002-3208-3336, Audurier, B ORCID: 0000-0001-9090-4254, Authier, JA ORCID: 0009-0000-4716-5097, Bacher, D ORCID: 0000-0002-1249-367X, Bachiller Perea, I ORCID: 0000-0002-3721-4876, Bachmann, S ORCID: 0000-0002-1186-3894, Bachmayer, M ORCID: 0000-0001-5996-2747, Back, JJ ORCID: 0000-0001-7791-4490, Baladron Rodriguez, P ORCID: 0000-0003-4240-2094, Balagura, V ORCID: 0000-0002-1611-7188, Balboni, A ORCID: 0009-0003-8872-976X, Baldini, W ORCID: 0000-0001-7658-8777, Baldwin, Z ORCID: 0000-0002-8534-0922, Balzani, L ORCID: 0009-0006-5241-1452, Bao, H ORCID: 0009-0002-7027-021X, Baptista De Souza Leite, J ORCID: 0000-0002-4442-5372, Barbero Pretel, C ORCID: 0009-0001-1805-6219, Barbetti, M ORCID: 0000-0002-6704-6914, Barbosa, IR ORCID: 0000-0002-3226-8672, Barlow, RJ ORCID: 0000-0002-8295-8612, Barnyakov, M ORCID: 0009-0000-0102-0482, Barsuk, S ORCID: 0000-0002-0898-6551, Barter, W ORCID: 0000-0002-9264-4799, Bartz, J ORCID: 0000-0002-2646-4124, Bashir, S ORCID: 0000-0001-9861-8922, Batsukh, B ORCID: 0000-0003-1020-2549, Battista, PB ORCID: 0009-0005-5095-0439, Bay, A ORCID: 0000-0002-4862-9399, Beck, A ORCID: 0000-0003-4872-1213, Becker, M ORCID: 0000-0002-7972-8760, Bedeschi, F ORCID: 0000-0002-8315-2119, Bediaga, IB ORCID: 0000-0001-7806-5283, Behling, NA ORCID: 0000-0003-4750-7872, Belin, S ORCID: 0000-0001-7154-1304, Bellavista, A ORCID: 0009-0009-3723-834X, Belous, K ORCID: 0000-0003-0014-2589, Belov, I ORCID: 0000-0003-1699-9202, Belyaev, I ORCID: 0000-0002-7458-7030, Benane, G ORCID: 0000-0002-8176-8315, Bencivenni, G ORCID: 0000-0002-5107-0610, Ben-Haim, E ORCID: 0000-0002-9510-8414, Berezhnoy, A ORCID: 0000-0002-4431-7582, Bernet, R ORCID: 0000-0002-4856-8063, Bernet Andres, S ORCID: 0000-0002-4515-7541, Bertolin, A ORCID: 0000-0003-1393-4315, Betti, F ORCID: 0000-0002-2395-235X, Bex, J ORCID: 0000-0002-2856-8074, Bezshyyko, O ORCID: 0000-0001-7106-5213, Bhattacharya, S ORCID: 0009-0007-8372-6008, Bhom, J ORCID: 0000-0002-9709-903X, Bieker, MS ORCID: 0000-0001-7113-7862, Biesuz, NV ORCID: 0000-0003-3004-0946, Biolchini, A ORCID: 0000-0001-6064-9993, Birch, M ORCID: 0000-0001-9157-4461, Bishop, FCR ORCID: 0000-0002-0023-3897, Bitadze, A ORCID: 0000-0001-7979-1092, Bizzeti, A ORCID: 0000-0001-5729-5530 and Blake, T ORCID: 0000-0002-0259-5891 (2026) Searches for B0 →k+π-τ+τ- and Bs0 →k+K-τ+τ- Decays Physical Review Letters, 136 (18). 181802-. ISSN 0031-9007, 1079-7114

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Abstract

The first searches for B0→K+π-τ+τ- and Bs0→K+K-τ+τ- decays at the LHCb experiment are conducted with pp collision data corresponding to an integrated luminosity of 5.4 fb-1. The tau leptons are reconstructed using the τ+→μ+ν¯τνμ decay and the results are presented in bins of K+π- or K+K- mass. No signal is observed and upper limits are set on the branching fractions. The searches result in the first upper limits for B0→K+π-τ+τ- decays outside the K∗(892)0 region in K+π- mass and the first limits for Bs0→K+K-τ+τ- decays. The searches are recast into limits on the decays B0→K∗(892)0τ+τ- and Bs0→φ(1020)τ+τ-, yielding 2.8×10-4 (2.5×10-4) and 4.7×10-4 (4.1×10-4) at the 95% (90%) confidence level, respectively. For the decay B0→K∗(892)0τ+τ-, this result improves on the current best upper limit by an order of magnitude.

Item Type:	Article
Uncontrolled Keywords:	LHCb Collaboration
Divisions:	Faculty of Humanities & Social Sciences Faculty of Science & Engineering Faculty of Science & Engineering > School of Physical Sciences Faculty of Science & Engineering > School of Physical Sciences > Physics Faculty of Humanities & Social Sciences > School of the Arts Faculty of Humanities & Social Sciences > School of the Arts > Architecture
Depositing User:	Symplectic Admin
Date Deposited:	26 May 2026 10:32
Last Modified:	30 May 2026 03:42
DOI:	10.1103/y968-44v8
Open Access URL:	https://journals.aps.org/prl/pdf/10.1103/y968-44v8
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3198617
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