Measurement of lepton universality parameters in B+ → K+ℓ+ℓ– and B0 → K*0ℓ+ℓ– decays

Aaij, R.; Abdelmotteleb, A.  S. W.; Abellan Beteta, C.; Abudinén, F.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Adlarson, P.; Afsharnia, H.; Agapopoulou, C.; Aidala, C.  A.; Ajaltouni, Z.; Akar, S.; Akiba, K.; Albicocco, P.; Albrecht, J.; Alessio, F.; Alexander, M.; Alfonso Albero, A.; Aliouche, Z.; Alvarez Cartelle, P.; Amalric, R.; Amato, S.; Amey, J.  L.; Amhis, Y.; An, L.; Anderlini, L.; Andersson, M.; Andreianov, A.; Andreotti, M.; Andreou, D.; Ao, D.; Archilli, F.; Artamonov, A.; Artuso, M.; Aslanides, E.; Atzeni, M.; Audurier, B.; Bachiller Perea, I.  B; Bachmann, S.; Bachmayer, M.; Back, J.  J.; Bailly-reyre, A.; Baladron Rodriguez, P.; Balagura, V.; Baldini, W.; Baptista de Souza Leite, J.; Barbetti, M.; Barlow, R.  J.; Barsuk, S.; Barter, W.; Bartolini, M.; Baryshnikov, F.; Basels, J.  M.; Bassi, G.; Batsukh, B.; Battig, A.; Bay, A.; Beck, A.; Becker, M.; Bedeschi, F.; Bediaga, I.  B.; Beiter, A.; Belin, S.; Bellee, V.; Belous, K.; Belov, I.; Belyaev, I.; Benane, G.; Bencivenni, G.; 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doi:10.1103/physrevd.108.032002

Title: Measurement of lepton universality parameters in B⁺ → K⁺ℓ⁺ℓ^– and B⁰ → K*⁰ℓ⁺ℓ^– decays

Journal Article · 01 August 2023 · Physical Review. D.

DOI: https://doi.org/10.1103/physrevd.108.032002 · OSTI ID:2423001

;

; Abellan Beteta, C.;

;

; Afsharnia, H.;

;

; Ajaltouni, Z.;

;

A simultaneous analysis of the B⁺ → K⁺ℓ⁺ℓ^– and B⁰ → K*⁰ℓ⁺ℓ^– decays is performed to test muon-electron universality in two ranges of the square of the dilepton invariant mass, q². The measurement uses a sample of beauty meson decays produced in proton-proton collisions collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9 fb^–1. A sequence of multivariate selections and strict particle identification requirements produce a higher signal purity and a better statistical sensitivity per unit luminosity than previous LHCb lepton universality tests using the same decay modes. Residual backgrounds due to misidentified hadronic decays are studied using data and included in the fit model. Each of the four lepton universality measurements reported is either the first in the given q² interval or supersedes previous LHCb measurements. The results are compatible with the predictions of the Standard Model.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)

Sponsoring Organization:: USDOE Office of Science (SC)

Contributing Organization:: LHCb Collaboration

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 2423001

Journal Information:: Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 108; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Differential branching fraction and angular analysis of Λb0 → Λμ+μ− decays Aaij, R.; Adeva, B.; Adinolfi, M. Journal of High Energy Physics, Vol. 2015, Issue 6 https://doi.org/10.1007/JHEP06(2015)115	journal	June 2015
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B →Vℓ+ℓ− in the Standard Model from light-cone sum rules Bharucha, Aoife; Straub, David M.; Zwicky, Roman Journal of High Energy Physics, Vol. 2016, Issue 8 https://doi.org/10.1007/JHEP08(2016)098	journal	August 2016
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Title: Measurement of lepton universality parameters in B⁺ → K⁺ℓ⁺ℓ^– and B⁰ → K*⁰ℓ⁺ℓ^– decays