2020
DOI: 10.1007/jhep05(2020)040
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Test of lepton universality with $$ {\Lambda}_b^0\to {pK}^{-}{\mathrm{\ell}}^{+}{\mathrm{\ell}}^{-} $$ decays

Abstract: The ratio of branching fractions of the decays Λ 0 b → pK − e + e − and Λ 0 b → pK − µ + µ − , R −1 pK , is measured for the first time using proton-proton collision data corresponding to an integrated luminosity of 4.7 fb −1 recorded with the LHCb experiment at center-of-mass energies of 7, 8 and 13 TeV. In the dilepton mass-squared range 0.1 < q 2 < 6.0 GeV 2 /c 4 and the pK − mass range m(pK −) < 2600 MeV/c 2 , the ratio of branching fractions is measured to be R −1 pK = 1.17 +0.18 −0.16 ± 0.07, where the f… Show more

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Cited by 49 publications
(17 citation statements)
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“…Searches for rare particle decays provide ideal probes for contributions from physics processes beyond the standard model (SM). Recent measurements of decays involving b → sl þ l − transitions (the inclusion of charge-conjugated processes is implied throughout this Letter) hint at deviations from SM predictions in lepton-flavor universality tests [1][2][3][4][5][6] and thus motivate measurements of decay rates into final states involving leptons. Following the observation of the decay B 0 s → μ þ μ − [7,8], the search for B 0 s → e þ e − and B 0 → e þ e − decays provides an independent test of leptonflavor universality.…”
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confidence: 99%
See 1 more Smart Citation
“…Searches for rare particle decays provide ideal probes for contributions from physics processes beyond the standard model (SM). Recent measurements of decays involving b → sl þ l − transitions (the inclusion of charge-conjugated processes is implied throughout this Letter) hint at deviations from SM predictions in lepton-flavor universality tests [1][2][3][4][5][6] and thus motivate measurements of decay rates into final states involving leptons. Following the observation of the decay B 0 s → μ þ μ − [7,8], the search for B 0 s → e þ e − and B 0 → e þ e − decays provides an independent test of leptonflavor universality.…”
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confidence: 99%
“…Z. Yang, 65 Y. Yao, 67 L. E. Yeomans, 59 H. Yin, 7 J. Yu, 7 X. Yuan, 67 O. Yushchenko, 43 K. A. Zarebski,52 M. Zavertyaev, 15,v M. Zdybal, 33 M. Zeng, 3 D. Zhang, 7 L. Zhang, 3 S. Zhang, 4 W. C. Zhang, 3,z Y. Zhang, 47 A. Zhelezov, 16 Y. Zheng, 5 X. Zhou, 5 Y. Zhou, 5 X. Zhu, 3 V. Zhukov, 13,39 J. B. Zonneveld,57 and S. Zucchelli 19,c (LHCb Collaboration) 1 Centro Brasileiro de Pesquisas Físicas (CBPF), Rio de Janeiro, Brazil x Also at Università della Basilicata, Potenza, Italy.…”
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confidence: 99%
“…Lepton flavour violation and universality tests at LHCb Miriam Lucio Martínez 2 range 0.1 < 2 < 6.0 2 / 4 and the − mass range ( − ) < 2600 / 2 . The result, −1 = 1.17 +0.18 −0.16 ± 0.17 [15], where the first uncertainty is statistical and the second systematic, is compatible with unity within 1 and constitutes an independent test of the SM [16].…”
Section: Pos(lhcp2020)115mentioning
confidence: 58%
“…For instance, the Λ b → Λ(1116)(→ N π)µ + µ − has been measured by the LHCb [8,9], and the observed branching ratio is lower than the SM predictions [10][11][12][13] with a trend that is also observed in the B (s) → K ( * ) (φ)µ + µ − decays. The LHCb has also performed the LFU violation measurement in Λ b → pK − + − decay [14].…”
Section: Jhep07(2020)002mentioning
confidence: 99%