Record #465984 - PUBDB

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InterLeptons

A search for new interactions at Belle II using leptons

Grant period	2020-11-01 - 2025-10-31
Funding body	European Union
Call number	ERC-2020-STG
Grant number	947006
Identifier	G:(EU-Grant)947006

Note: Several measurements in the quark and in the lepton flavor sectors have shown anomalies with respect to the standard model expectations and are now referred to as flavor anomalies. The Belle II experiment at the Super-KEKB laboratory in Japan is collecting data by colliding beams of electrons and positrons. The aim of this proposal is to look for physics beyond the standard model at the Belle II experiment by a) searching for the direct production of new light particles, and b) looking for deviations from theoretical predictions when performing precision tests of the standard model. The team will analyse events with leptons and large missing energy in the final states and implement the most advanced analysis techniques including, for the first time, deep learning tools in the identification of signals at the Belle II experiment. First, we will search for invisible decays of a dark Z' boson, a hypothetical particle that might also explain the anomaly reported in the anomalous magnetic moment of the muon. Second, we will test with per mille precision lepton flavor universality by studying leptonic decays of the tau lepton and use the results to constrain new physics models such as those containing a lepton flavor violating Z' boson. Finally, we will search for new physics via lepton flavor violating decays of bottomonium resonances produced in initial state radiation events that, thanks also to an effective field theory approach, will allow us to interpret the search in terms of new physics mass scale and coupling constant, with an approach complementary to that of the LHC.

European Comission

Recent Publications

All known publications ...
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Journal Article Adachi, I. ; Aggarwal, L. ; Ahmed, H.Extern* ; et al
Search for a Dark Higgs Boson Produced in Association with Inelastic Dark Matter at the Belle II Experiment
Physical review letters 135(13), 131801 (2025) [10.1103/37w5-glpp]2025 arXiv Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Adamczyk, K. M. ; Aggarwal, L. ; et al
Search for Lepton-Flavor-Violating Decay Modes B0→KS0τ±ℓ∓ with Hadronic B Tagging at Belle and Belle II
Physical review letters 135(4), 041801 (2025) [10.1103/yzvh-v3hm]2025 arXiv Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Aggarwal, L. ; Aihara, H.Extern* ; et al
Determination of $|V_{ub}|$ from simultaneous measurements of untagged $B^0\to\pi^- \ell^+ \nu_{\ell}$ and $B^+\to\rho^0 \ell^+\nu_{\ell}$ decays
Physical review / D 111(11), 112009 (2025) [10.1103/jnwn-ts6q]2025 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Preprint Abumusabh, M. ; Adachi, I. ; Aggarwal, L. ; et al
Measurement of time-dependent $CP$ asymmetries in $B^0 \to K_{\rm S}^0 \: π^{+} π^{-} γ$ decays at Belle and Belle II
[10.3204/PUBDB-2025-04280] OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Preprint Abumusabh, M. ; Adachi, I. ; Ahmed, H. ; et al
Search for $CP$ violation in $Ξ_c^+\toΣ^+h^+h^-$ and $Λ_c^+\to ph^+h^-$ at Belle II
[10.3204/PUBDB-2025-04279] OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Preprint Abumusabh, M. ; Adachi, I. ; Aggarwal, L. ; et al
Search for $e^+ e^- \to \gamma X_{bJ}$ ($J$ = 0, 1, 2) near $\sqrt{s}$ = 10.746 GeV at Belle II
arXiv Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Aggarwal, L. ; Ahmed, H.Extern* ; et al
Measurement of the CP asymmetry in $D^+ \to \pi^+ \pi^0$ decays at Belle II
Physical review / D 112(3), L031101 (2025) [10.1103/3kqk-ldm4]2025 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Aggarwal, L. ; Ahmed, H.Extern* ; et al
Search for lepton-flavor-violating ${\tau }^{-}\to {{\ell}}^{-}{K}_{s}^{0}$ decays at Belle and Belle II
Journal of high energy physics 08(8), 092 (2025) [10.1007/JHEP08(2025)092]2025 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Ahn, Y. ; Akopov, N. ; et al
Measurement of the time-integrated $CP$ asymmetry in $D^0 \to K^0_{\rm S} K^0_{\rm S}$ decays using opposite-side flavor tagging at Belle and Belle II
Physical review / D 112(1), 012017 (2025) [10.1103/8x1h-39dp]2025 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Aggarwal, L. ; Ahmed, H.Extern* ; et al
Evidence of the P$_{c\bar{c}s}$(4459)$^0$ in Upsilon(1S, 2S) inclusive decays at Belle
Physical review letters 135, 041901 (2025) [10.1103/pf8m-6j69]2025 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

All known publications ...
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Record created 2021-10-11, last modified 2023-02-10

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