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Search for B⁺→K⁺ν$\bar{ν}$ Decays Using an Inclusive Tagging Method at Belle II

Belle 2 Collaboration; Abudinén, F.; Adachi, I.; Adamczyk, K.; Ahlburg, P.; Aihara, H.; Akopov, N.; Aloisio, A.; Anh Ky, N.; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.; Baur, A.; Babu, V.; Baehr, S. 1; Bambade, P.; Banerjee, Sw.; Bansal, S.; ... mehr


A search for the flavor-changing neutral-current decay B$^{+}$→K$^{+}$ν$\overline{ν}$ is performed at the Belle II experiment at the SuperKEKB asymmetric energy electron-positron collider. The data sample corresponds to an integrated luminosity of 63  fb$^{-1}$ collected at the Υ(4S) resonance and a sample of 9  fb$^{-1}$ collected at an energy 60 MeV below the resonance. Because the measurable decay signature involves only a single charged kaon, a novel measurement approach is used that exploits not only the properties of the B$^{+}$→K+ν¯ν decay, but also the inclusive properties of the other B meson in the Υ(4S)→B$\overline{B}$ event, to suppress the background from other B meson decays and light-quark pair production. This inclusive tagging approach offers a higher signal efficiency compared to previous searches. No significant signal is observed. An upper limit on the branching fraction of B$^{+}$→K$^{+}$ν$\overline{ν}$ of 4.1×10$^{-5}$ is set at the 90% confidence level.

Verlagsausgabe §
DOI: 10.5445/IR/1000140047
Veröffentlicht am 16.11.2021
DOI: 10.1103/PhysRevLett.127.181802
Zitationen: 16
Web of Science
Zitationen: 8
Zitationen: 11
Cover der Publikation
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Publikationsjahr 2021
Sprache Englisch
Identifikator ISSN: 0031-9007, 1079-7114
KITopen-ID: 1000140047
Erschienen in Physical review letters
Verlag American Physical Society (APS)
Band 127
Heft 18
Seiten Article: 181802
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 27.10.2021
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