Record #467560 - PUBDB

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TAULEPGAMMA

Search for the Lepton Flavour Violating Decay Tau to Lepton + Gamma at the Belle II Experiment

Grant period	2021-06-01 - 2023-05-31
Funding body	European Union
Call number	H2020-MSCA-IF-2020
Grant number	101026516
Identifier	G:(EU-Grant)101026516

Note: I propose a measurement of the lepton flavour violating (LFV) tau -> lepton + gamma decay, where the lepton is a muon or an electron. This will be carried out at the University of Pisa (Italy) under the supervision of Prof. Francesco Forti. Although highly successful, the Standard Model (SM) of particle physics does not completely describe all the phenomena we observe, such as the recent discovery of neutrino oscillations which violate lepton flavour conservation in the neutral sector. Many scenarios have been advanced to extend the SM into a bigger picture; several of these models predict LFV to occur in the charged sector as well at measurable rates. I will exploit the unprecedented data sample provided by the Belle II experiment at SuperKEKB to measure the tau -> lepton + gamma decay rate with a sensitivity of at least a factor of four greater than any previous measurement. In order to achieve this result I will develop an advanced physics analysis, making full use of the characteristics of the state-of-the-art Belle II detector and incorporating modern techniques such as machine learning. I will use my experience in physics analysis, preparatory studies and detector performance measurements to make this possible. The impact of a measurement of such sensitivity would be tremendous. A discovery of charged LFV would constitute an enormous breakthrough which would spark a new era of particle physics; a non-observation would instead place strong constraints on possible extensions of the SM and inform physics studies for the coming decade.

European Comission

Recent Publications

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Journal Article Adachi, I. ; Aggarwal, L. ; Ahmed, H.Extern* ; et al
Observation of $e^+e^-\to \eta \Upsilon(2S)$ and search for $e^+e^-\to \eta \Upsilon(1S), \gamma X_b$ at $\sqrt{s}$ near 10.75 GeV
Physical review / D 113(5), L051102 (2026) [10.1103/9f61-rmvx]2026 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Aggarwal, L. ; Ahmed, H.Extern* ; et al
Improved measurement of Born cross sections for χ$_{bJ}$ω and χ$_{bJ}$ (π$^{+}$π$^{−}$π$^{0}$)$_{non−ω}$ (J = 0, 1, 2) at Belle and Belle II
Journal of high energy physics 04(4), 101 (2026) [10.1007/JHEP04(2026)101]2026 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Abumusabh, M. ; Adachi, I. ; Aggarwal, L. ; et al
Measurement of the $CP$ asymmetry in $D^0\toπ^+π^-π^0$ decays at Belle II
Physical review / D 113(5), 052006 (2026) [10.1103/4yv7-1h85]2026 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Abumusabh, M. ; Adachi, I. ; Aggarwal, L. ; et al
Search for $e^{+} e^{-} \rightarrow \gamma \chi_{b J}$ $(J = 0, 1, 2)$ near $\sqrt{s}=10.746~\text{GeV}$ at Belle II
Physical review / D 113(5), 052009 (2026) [10.1103/2rv3-s3w7]2026 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Preprint Abumusabh, M. ; Adachi, I. ; Aggarwal, A. ; et al
Study of $e^+e^- \to π^+π^-Υ(1D)$ at Belle II
arXiv Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Abumusabh, M. ; Adachi, I. ; Adamczyk, K. ; et al
Measurement of inclusive $B \to X_u \ell ν$ partial branching fractions and $|V_{ub}|$ at Belle II
Physical review / D 113(3), 032004 (2026) [10.1103/59ws-zxbt]2026 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Abumusabh, M. ; Adachi, I. ; Aggarwal, L. ; et al
Measurement of time-dependent CP asymmetries in ${B}^{0}\to {K}_{\text{S}}^{0}{\pi }^{+}{\pi }^{-}\gamma $ decays at Belle and Belle II
Journal of high energy physics 01(1), 134 (2026) [10.1007/JHEP01(2026)134]2026 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Preprint Abumusabh, M. ; Adachi, I. ; Adamczyk, K. M. ; et al
Study of $B^+ \to μ^+ ν_μ$ decays at Belle and Belle II
[10.3204/PUBDB-2026-00789] OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. ; Aggarwal, L. ; Ahmed, H.Extern* ; et al
Search for the lepton-flavor-violating $τ^{-} \rightarrow e^{\mp} \ell^{\pm} \ell^{\mp}$ decays at Belle II
Journal of high energy physics 2025(12), 169 (2025) [10.1007/JHEP12(2025)169]2025 OpenAccess Files Fulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

Journal Article Adachi, I. (Corresponding author)Extern* ; Adamczyk, K. ; Aggarwal, L. ; et al
Determination of |Vcb| using B→Dℓνl decays at Belle II
Physical review / D 112(11), 112009 (2025) [10.1103/vs8k-259v]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 2023-02-12

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