Search for B+ -> K+nu(nu)over-bar Decays Using an Inclusive Tagging Method at Belle Hopen accessSearch for B+ → K+ νν¯ Decays Using an Inclusive Tagging Method at Belle II
Search for Decays Using an Inclusive Tagging Method at Belle II
Search for B^{+}→K^{+}νν[over ¯] Decays Using an Inclusive Tagging Method at Belle II
- Other Titles
- Search for B+ → K+ νν¯ Decays Using an Inclusive Tagging Method at Belle II
Search for Decays Using an Inclusive Tagging Method at Belle II
Search for B^{+}→K^{+}νν[over ¯] Decays Using an Inclusive Tagging Method at Belle II
- Authors
- Abudinen, F.; Adachi, I; Adamczyk, K.; Ahlburg, P.; Cheon, Byung Gu
- Issue Date
- Oct-2021
- Publisher
- AMER PHYSICAL SOC
- Citation
- PHYSICAL REVIEW LETTERS, v.127, no.18
- Indexed
- SCIE
SCOPUS
- Journal Title
- PHYSICAL REVIEW LETTERS
- Volume
- 127
- Number
- 18
- URI
- https://scholarworks.bwise.kr/hanyang/handle/2021.sw.hanyang/189183
- DOI
- 10.1103/PhysRevLett.127.181802
- ISSN
- 0031-9007
- Abstract
- A search for the flavor-changing neutral-current decay B+ -> K+nu(nu) over bar 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 Upsilon(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+nu(nu) over bar decay, but also the inclusive properties of the other B meson in the Upsilon(4S) -> B (B) over bar 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+nu(nu) over bar of 4.1 x 10(-5) is set at the 90% confidence level.
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