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Search for the rare decay of B⁺ → l⁺ν$_{lγ}$ with improved hadronic taggingγ

Belle Collaboration; Gelb, M. 1; Bernlochner, F. U. 1; Goldenzweig, P. 1; Metzner, F. ORCID iD icon 1; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Atmacan, H.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.; Bansal, V.; Behera, P.; Beleño, C.; Bhuyan, B.; Biswal, J.; ... mehr


We present the result of the search for the rare B meson decay of B+→ℓ+νℓγ with ℓ=e,μ. For the search the full data set recorded by the Belle experiment of 711  fb−1 integrated luminosity near the Υ(4S) resonance is used. Signal candidates are reconstructed for photon energies Eγ larger than 1 GeV using a novel multivariate tagging algorithm. The novel algorithm fully reconstructs the second B meson produced in the collision using hadronic modes and was specifically trained to recognize the signal signature in combination with hadronic tag-side B meson decays. This approach greatly enhances the performance. Background processes that can mimic this signature, mainly charmless semileptonic decays and continuum processes, are suppressed using multivariate methods. The number of signal candidates is determined by analyzing the missing mass squared distribution as inferred from the signal side particles and the kinematic properties of the tag-side B meson. No significant excess over the background-only hypothesis is observed and upper limits on the partial branching fraction ΔB with Eγ>1  GeV individually for electron and muon final states as well as for the average branching fraction of both lepton final states are reported. ... mehr

Verlagsausgabe §
DOI: 10.5445/IR/1000089213
Veröffentlicht am 08.01.2019
DOI: 10.1103/PhysRevD.98.112016
Zitationen: 20
Web of Science
Zitationen: 10
Zitationen: 10
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2018
Sprache Englisch
Identifikator ISSN: 2470-0010, 2470-0029
KITopen-ID: 1000089213
Erschienen in Physical review / D
Verlag American Physical Society (APS)
Band 98
Heft 11
Seiten Article: 112016
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 28.12.2018
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