K Hayasaka
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Explore the profile of K Hayasaka including associated specialties, affiliations and a list of published articles.
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384
Citations
1919
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Recent Articles
1.
Adachi I, Aggarwal L, Ahmed H, Aihara H, Akopov N, Aloisio A, et al.
Phys Rev Lett
. 2025 Feb;
134(1):011802.
PMID: 39913692
We report measurements of time-dependent CP asymmetries in B^{0}→K_{S}^{0}π^{0}γ decays based on a data sample of (388±6)×10^{6} BB[over ¯] events collected at the ϒ(4S) resonance with the Belle II detector....
2.
Kovalenko E, Adachi I, Aihara H, Asner D, Aushev T, Ayad R, et al.
Phys Rev Lett
. 2025 Jan;
133(26):261901.
PMID: 39879008
We report the first evidence for the h_{b}(2P)→ϒ(1S)η transition with a significance of 3.5 standard deviations. The decay branching fraction is measured to be B[h_{b}(2P)→ϒ(1S)η]=(7.1_{-3.2}^{+3.7}±0.8)×10^{-3}, which is noticeably smaller than...
3.
Adachi I, Aggarwal L, Aihara H, Akopov N, Aloisio A, Al Said S, et al.
Phys Rev Lett
. 2024 Sep;
133(10):101804.
PMID: 39303229
We present the results of a search for the b→dℓ^{+}ℓ^{-} flavor-changing neutral-current rare decays B^{+,0}→(η,ω,π^{+,0},ρ^{+,0})e^{+}e^{-} and B^{+,0}→(η,ω,π^{0},ρ^{+})μ^{+}μ^{-} using a 711 fb^{-1} data sample that contains 772×10^{6} BB[over ¯] events. The...
4.
Guan Y, Schwartz A, Kinoshita K, Adachi I, Aihara H, Al Said S, et al.
Phys Rev Lett
. 2024 Sep;
133(8):081801.
PMID: 39241732
We present a comprehensive study of B^{0}→ωω decays using 772×10^{6} BB[over ¯] pairs collected with the Belle detector at the KEKB e^{+}e^{-} collider. This process is a suppressed charmless decay...
5.
Gu T, Savinov V, Adachi I, Aihara H, Asner D, Atmacan H, et al.
Phys Rev Lett
. 2024 Aug;
133(7):071802.
PMID: 39213574
We report the results of the first search for B^{-} decays to the Ξ[over ¯]_{c}^{0}Λ[over ¯]_{c}^{-} final state using 711 fb^{-1} of data collected at the ϒ(4S) resonance with the...
6.
Liventsev D, Adachi I, Aihara H, Al Said S, Asner D, Atmacan H, et al.
Phys Rev Lett
. 2023 Dec;
131(21):211802.
PMID: 38072609
We report on a search for a heavy Majorana neutrino in the decays τ^{-}→π^{-}ν_{h}, ν_{h}→π^{±}ℓ^{∓}, ℓ=e, μ. The results are obtained using the full data sample of 988 fb^{-1} collected...
7.
Cao L, Bernlochner F, Tackmann K, Adachi I, Aihara H, Al Said S, et al.
Phys Rev Lett
. 2023 Dec;
131(21):211801.
PMID: 38072600
The first simultaneous determination of the absolute value of the Cabibbo-Kobayashi-Maskawa matrix element V_{ub} using inclusive and exclusive decays is performed with the full Belle data set at the ϒ(4S)...
8.
Adachi I, Adamczyk K, Aggarwal L, Aihara H, Akopov N, Aloisio A, et al.
Phys Rev Lett
. 2023 Nov;
131(18):181801.
PMID: 37977641
We present the first comprehensive tests of the universality of the light leptons in the angular distributions of semileptonic B^{0}-meson decays to charged spin-1 charmed mesons. We measure five angular-asymmetry...
9.
Adachi I, Aggarwal L, Aihara H, Akopov N, Aloisio A, Anh Ky N, et al.
Phys Rev Lett
. 2023 Nov;
131(17):171803.
PMID: 37955504
We measure the lifetime of the D_{s}^{+} meson using a data sample of 207 fb^{-1} collected by the Belle II experiment running at the SuperKEKB asymmetric-energy e^{+}e^{-} collider. The lifetime...
10.
Adachi I, Adamczyk K, Aggarwal L, Ahmed H, Aihara H, Akopov N, et al.
Phys Rev Lett
. 2023 Oct;
131(12):121802.
PMID: 37802942
We report the first search for a nonstandard-model resonance decaying into τ pairs in e^{+}e^{-}→μ^{+}μ^{-}τ^{+}τ^{-} events in the 3.6-10 GeV/c^{2} mass range. We use a 62.8 fb^{-1} sample of e^{+}e^{-}...