Please use this identifier to cite or link to this item:
https://hdl.handle.net/2440/134537
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Type: | Journal article |
Title: | Search for B⁺→K⁺ νν̄ decays using an inclusive tagging method at Belle II |
Other Titles: | Search for B(+)->K(+) nu nu decays using an inclusive tagging method at Belle II |
Author: | 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. Bambade, P. Banerjee, S. Bansal, S. Baudot, J. Becker, J. et al. |
Citation: | Physical Review Letters, 2021; 127(18):181802-1-181802-10 |
Publisher: | American Physical Society |
Issue Date: | 2021 |
ISSN: | 0031-9007 1079-7114 |
Statement of Responsibility: | F. Abudinen, I. ... P. Grace ... P. Jackson ... et al. |
Abstract: | A search for the flavor-changing neutral-current decay B^{+}→K^{+}νν[over ¯] 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^{+}νν[over ¯] decay, but also the inclusive properties of the other B meson in the ϒ(4S)→BB[over ¯] 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^{+}νν[over ¯] of 4.1×10^{-5} is set at the 90% confidence level. |
Keywords: | Belle II Collaboration |
Rights: | Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. |
DOI: | 10.1103/PhysRevLett.127.181802 |
Grant ID: | http://purl.org/au-research/grants/arc/DP180102629 http://purl.org/au-research/grants/arc/DP170102389 http://purl.org/au-research/grants/arc/DP170102204 http://purl.org/au-research/grants/arc/DP150103061 http://purl.org/au-research/grants/arc/FT130100303 http://purl.org/au-research/grants/arc/FT130100018 http://purl.org/au-research/grants/arc/FT120100745 |
Published version: | http://dx.doi.org/10.1103/physrevlett.127.181802 |
Appears in Collections: | Physics publications |
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hdl_134537.pdf | Published version | 398.69 kB | Adobe PDF | View/Open |
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