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Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays

The journal of high energy physics, 2021-03, Vol.2021 (3), p.1-24, Article 105 [Peer Reviewed Journal]

The Author(s) 2021 ;The Author(s) 2021. This work is published under CC-BY 4.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 1029-8479 ;EISSN: 1029-8479 ;DOI: 10.1007/JHEP03(2021)105

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Title:
Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays
Author: Giri, A. ; Asner, D. M. ; Atmacan, H. ; Aulchenko, V. ; Ayad, R. ; Beleño, C. ; Biswal, J. ; Bonvicini, G. ; Bozek, A. ; Browder, T. E. ; Červenkov, D. ; Chang, M.-C. ; Chang, P. ; Chekelian, V. ; Choi, S.-K. ; Cinabro, D. ; Cunliffe, S. ; De Nardo, G. ; Dingfelder, J. ; Doležal, Z. ; Dong, T. V. ; Dossett, D. ; Dubey, S. ; Eidelman, S. ; Fulsom, B. G. ; Garg, R. ; Garmash, A. ; Goldenzweig, P. ; Golob, B. ; Hedges, M. T. ; Hou, W.-S. ; Hsu, C.-L. ; Joo, C. W. ; Joo, K. K. ; Kahn, J. ; Kaliyar, A. B. ; Kang, K. H. ; Karyan, G. ; Kichimi, H. ; Kiesling, C. ; Kim, K. T. ; Kodyš, P. ; Kotchetkov, D. ; Kuhr, T. ; Li, L. K. ; Libby, J. ; Lieret, K. ; Liventsev, D. ; Luo, T. ; Masuda, M. ; Matvienko, D. ; Merola, M. ; Mohanty, S. ; Natkaniec, Z. ; Nayak, L. ; Niiyama, M. ; Nisar, N. K. ; Ogawa, K. ; Ono, H. ; Onuki, Y. ; Oskin, P. ; Pakhlov, P. ; Park, H. ; Park, S.-H. ; Pedlar, T. K. ; Pestotnik, R. ; Podobnik, T. ; Prim, M. T. ; Rabusov, A. ; Rostomyan, A. ; Rout, N. ; Rozanska, M. ; Sanuki, T. ; Schnell, G. ; Schueler, J. ; Schwartz, A. J. ; Seino, Y. ; Senyo, K. ; Shapkin, M. ; Shwartz, B. ; Simon, F. ; Starič, M. ; Stottler, Z. S. ; Sumiyoshi, T. ; Takizawa, M. ; Tanida, K. ; Uchida, M. ; Urquijo, P. ; Ushiroda, Y. ; Vorobyev, V. ; Waheed, E. ; Wang, C. H. ; Watanuki, S. ; Wehle, S. ; Wiechczynski, J. ; Won, E. ; Yabsley, B. D. ; Yang, S. B. ; Yuan, C. Z. ; Zhang, Z. P.
Subjects: Asymmetry ; B physics ; Bins ; Classical and Quantum Gravitation ; Confidence ; Decay ; e +-e − Experiments ; Elementary Particles ; FCNC Interaction ; Flavor (particle physics) ; Flavor physics ; Flavour Changing Neutral Currents ; High energy physics ; INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY ; Laboratories ; Leptons ; Mathematics ; Nuclear physics ; Physics ; Physics and Astronomy ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; Quantum Field Theories ; Quantum Field Theory ; Quantum Physics ; Regular Article - Experimental Physics ; Relativity Theory ; Science education ; Standard model (particle physics) ; String Theory
Is Part Of: The journal of high energy physics, 2021-03, Vol.2021 (3), p.1-24, Article 105
Description: A bstract We present measurements of the branching fractions for the decays B → Kμ + μ − and B → Ke + e − , and their ratio ( R K ), using a data sample of 711 fb − 1 that contains 772 × 10 6 B B ¯ events. The data were collected at the ϒ(4 S ) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider. The ratio R K is measured in five bins of dilepton invariant-mass-squared ( q 2 ): q 2 ∈ (0 . 1 , 4 . 0) , (4 . 00 , 8 . 12) , (1 . 0 , 6 . 0), (10 . 2 , 12 . 8) and ( > 14 . 18) GeV 2 /c 4 , along with the whole q 2 region. The R K value for q 2 ∈ (1 . 0 , 6 . 0) GeV 2 /c 4 is 1.03 − 0.24 + 0.28 ± 0 . 01. The first and second uncertainties listed are statistical and systematic, respectively. All results for R K are consistent with Standard Model predictions. We also measure CP -averaged isospin asymmetries in the same q 2 bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q 2 ∈ (1 . 0 , 6 . 0) GeV 2 /c 4 bin in the mode with muon final states. The measured differential branching fractions, d ℬ /dq 2 , are consistent with theoretical predictions for charged B decays, while the corresponding values are below the expectations for neutral B decays. We have also searched for lepton-flavor-violating B → Kμ ± e ∓ decays and set 90% confidence-level upper limits on the branching fraction in the range of 10 − 8 for B + → K + μ ± e ∓ , and B 0 → K 0 μ ± e ∓ modes.
Publisher: Berlin/Heidelberg: Springer Berlin Heidelberg
Language: English
Identifier: ISSN: 1029-8479
EISSN: 1029-8479
DOI: 10.1007/JHEP03(2021)105
Source: ProQuest Central
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Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays

The Author(s) 2021 ;The Author(s) 2021. This work is published under CC-BY 4.0 (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License. ;ISSN: 1029-8479 ;EISSN: 1029-8479 ;DOI: 10.1007/JHEP03(2021)105

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