Search for lepton-flavor-violating tau decays to ℓα at Belle
Abstract We report a search for the lepton-flavor-violating decays τ ± → ℓ ± α (ℓ = e, μ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 106 tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy e + e − collider. We find no evidence of...
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| Format: | Article |
| Language: | English |
| Published: |
SpringerOpen
2025-08-01
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| Series: | Journal of High Energy Physics |
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| Online Access: | https://doi.org/10.1007/JHEP08(2025)155 |
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| author | The BELLE collaboration K. Uno K. Hayasaka K. Inami H. Aihara R. Ayad Sw. Banerjee K. Belous J. Bennett M. Bessner D. Biswas D. Bodrov M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola K. Cho S.-K. Choi Y. Choi S. Choudhury G. De Nardo G. De Pietro F. Di Capua J. Dingfelder Z. Doležal P. Ecker D. Epifanov T. Ferber B. G. Fulsom V. Gaur A. Giri P. Goldenzweig E. Graziani Y. Guan K. Gudkova C. Hadjivasiliou T. Hara H. Hayashii D. Herrmann C.-L. Hsu N. Ipsita A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs Y. Jin C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim K. Kinoshita P. Kodyš A. Korobov S. Korpar E. Kovalenko P. Krokovny R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon T. Lam L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev Y. Ma M. Masuda T. Matsuda D. Matvienko F. Meier M. Merola K. Miyabayashi G. B. Mohanty M. Nakao H. Nakazawa A. Natochii M. Niiyama S. Nishida S. Ogawa H. Ono S. Pardi J. Park S.-H. Park S. Patra S. Paul T. K. Pedlar L. E. Piilonen T. Podobnik S. Prell E. Prencipe M. T. Prim G. Russo S. Sandilya L. Santelj V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo W. Shan J.-G. Shiu B. Shwartz F. Simon J. B. Singh E. Solovieva M. Starič M. Sumihama M. Takizawa K. Tanida F. Tenchini K. Trabelsi S. Uehara T. Uglov Y. Unno S. Uno M.-Z. Wang E. Won B. D. Yabsley Y. Yook C. Z. Yuan L. Yuan Y. Yusa Z. P. Zhang V. Zhilich |
| author_facet | The BELLE collaboration K. Uno K. Hayasaka K. Inami H. Aihara R. Ayad Sw. Banerjee K. Belous J. Bennett M. Bessner D. Biswas D. Bodrov M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola K. Cho S.-K. Choi Y. Choi S. Choudhury G. De Nardo G. De Pietro F. Di Capua J. Dingfelder Z. Doležal P. Ecker D. Epifanov T. Ferber B. G. Fulsom V. Gaur A. Giri P. Goldenzweig E. Graziani Y. Guan K. Gudkova C. Hadjivasiliou T. Hara H. Hayashii D. Herrmann C.-L. Hsu N. Ipsita A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs Y. Jin C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim K. Kinoshita P. Kodyš A. Korobov S. Korpar E. Kovalenko P. Krokovny R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon T. Lam L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev Y. Ma M. Masuda T. Matsuda D. Matvienko F. Meier M. Merola K. Miyabayashi G. B. Mohanty M. Nakao H. Nakazawa A. Natochii M. Niiyama S. Nishida S. Ogawa H. Ono S. Pardi J. Park S.-H. Park S. Patra S. Paul T. K. Pedlar L. E. Piilonen T. Podobnik S. Prell E. Prencipe M. T. Prim G. Russo S. Sandilya L. Santelj V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo W. Shan J.-G. Shiu B. Shwartz F. Simon J. B. Singh E. Solovieva M. Starič M. Sumihama M. Takizawa K. Tanida F. Tenchini K. Trabelsi S. Uehara T. Uglov Y. Unno S. Uno M.-Z. Wang E. Won B. D. Yabsley Y. Yook C. Z. Yuan L. Yuan Y. Yusa Z. P. Zhang V. Zhilich |
| author_sort | The BELLE collaboration |
| collection | DOAJ |
| description | Abstract We report a search for the lepton-flavor-violating decays τ ± → ℓ ± α (ℓ = e, μ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 106 tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy e + e − collider. We find no evidence of signal and obtain the most stringent upper limits on the branching fractions at 95% confidence level: $$\mathcal{B}$$ (τ ± → e ± α) < (0.4–6.4) × 10 −4 and $$\mathcal{B}$$ (τ ± → μ ± α) < (0.2–3.5) × 10 −4 at 95% confidence level for an α mass in the range 0.0 ≤ m α ≤ 1.6 GeV/c 2. |
| format | Article |
| id | doaj-art-9480f35f072746c680fc9ec5d8aa69c8 |
| institution | Kabale University |
| issn | 1029-8479 |
| language | English |
| publishDate | 2025-08-01 |
| publisher | SpringerOpen |
| record_format | Article |
| series | Journal of High Energy Physics |
| spelling | doaj-art-9480f35f072746c680fc9ec5d8aa69c82025-08-24T11:04:42ZengSpringerOpenJournal of High Energy Physics1029-84792025-08-012025811410.1007/JHEP08(2025)155Search for lepton-flavor-violating tau decays to ℓα at BelleThe BELLE collaborationK. UnoK. HayasakaK. InamiH. AiharaR. AyadSw. BanerjeeK. BelousJ. BennettM. BessnerD. BiswasD. BodrovM. BračkoP. BranchiniT. E. BrowderA. BudanoM. CampajolaK. ChoS.-K. ChoiY. ChoiS. ChoudhuryG. De NardoG. De PietroF. Di CapuaJ. DingfelderZ. DoležalP. EckerD. EpifanovT. FerberB. G. FulsomV. GaurA. GiriP. GoldenzweigE. GrazianiY. GuanK. GudkovaC. HadjivasiliouT. HaraH. HayashiiD. HerrmannC.-L. HsuN. IpsitaA. IshikawaR. ItohM. IwasakiW. W. JacobsY. JinC. KieslingC. H. KimD. Y. KimK.-H. KimK. KinoshitaP. KodyšA. KorobovS. KorparE. KovalenkoP. KrokovnyR. KumarK. KumaraA. KuzminY.-J. KwonT. LamL. K. LiY. B. LiL. Li GioiJ. LibbyD. LiventsevY. MaM. MasudaT. MatsudaD. MatvienkoF. MeierM. MerolaK. MiyabayashiG. B. MohantyM. NakaoH. NakazawaA. NatochiiM. NiiyamaS. NishidaS. OgawaH. OnoS. PardiJ. ParkS.-H. ParkS. PatraS. PaulT. K. PedlarL. E. PiilonenT. PodobnikS. PrellE. PrencipeM. T. PrimG. RussoS. SandilyaL. SanteljV. SavinovG. SchnellC. SchwandaY. SeinoK. SenyoW. ShanJ.-G. ShiuB. ShwartzF. SimonJ. B. SinghE. SolovievaM. StaričM. SumihamaM. TakizawaK. TanidaF. TenchiniK. TrabelsiS. UeharaT. UglovY. UnnoS. UnoM.-Z. WangE. WonB. D. YabsleyY. YookC. Z. YuanL. YuanY. YusaZ. P. ZhangV. ZhilichAbstract We report a search for the lepton-flavor-violating decays τ ± → ℓ ± α (ℓ = e, μ), where α is an undetected spin-0 particle, such as an axion-like particle using 736 × 106 tau lepton pairs collected by the Belle detector at the KEKB asymmetric-energy e + e − collider. We find no evidence of signal and obtain the most stringent upper limits on the branching fractions at 95% confidence level: $$\mathcal{B}$$ (τ ± → e ± α) < (0.4–6.4) × 10 −4 and $$\mathcal{B}$$ (τ ± → μ ± α) < (0.2–3.5) × 10 −4 at 95% confidence level for an α mass in the range 0.0 ≤ m α ≤ 1.6 GeV/c 2.https://doi.org/10.1007/JHEP08(2025)155e +-e − ExperimentsTau Physics |
| spellingShingle | The BELLE collaboration K. Uno K. Hayasaka K. Inami H. Aihara R. Ayad Sw. Banerjee K. Belous J. Bennett M. Bessner D. Biswas D. Bodrov M. Bračko P. Branchini T. E. Browder A. Budano M. Campajola K. Cho S.-K. Choi Y. Choi S. Choudhury G. De Nardo G. De Pietro F. Di Capua J. Dingfelder Z. Doležal P. Ecker D. Epifanov T. Ferber B. G. Fulsom V. Gaur A. Giri P. Goldenzweig E. Graziani Y. Guan K. Gudkova C. Hadjivasiliou T. Hara H. Hayashii D. Herrmann C.-L. Hsu N. Ipsita A. Ishikawa R. Itoh M. Iwasaki W. W. Jacobs Y. Jin C. Kiesling C. H. Kim D. Y. Kim K.-H. Kim K. Kinoshita P. Kodyš A. Korobov S. Korpar E. Kovalenko P. Krokovny R. Kumar K. Kumara A. Kuzmin Y.-J. Kwon T. Lam L. K. Li Y. B. Li L. Li Gioi J. Libby D. Liventsev Y. Ma M. Masuda T. Matsuda D. Matvienko F. Meier M. Merola K. Miyabayashi G. B. Mohanty M. Nakao H. Nakazawa A. Natochii M. Niiyama S. Nishida S. Ogawa H. Ono S. Pardi J. Park S.-H. Park S. Patra S. Paul T. K. Pedlar L. E. Piilonen T. Podobnik S. Prell E. Prencipe M. T. Prim G. Russo S. Sandilya L. Santelj V. Savinov G. Schnell C. Schwanda Y. Seino K. Senyo W. Shan J.-G. Shiu B. Shwartz F. Simon J. B. Singh E. Solovieva M. Starič M. Sumihama M. Takizawa K. Tanida F. Tenchini K. Trabelsi S. Uehara T. Uglov Y. Unno S. Uno M.-Z. Wang E. Won B. D. Yabsley Y. Yook C. Z. Yuan L. Yuan Y. Yusa Z. P. Zhang V. Zhilich Search for lepton-flavor-violating tau decays to ℓα at Belle Journal of High Energy Physics e +-e − Experiments Tau Physics |
| title | Search for lepton-flavor-violating tau decays to ℓα at Belle |
| title_full | Search for lepton-flavor-violating tau decays to ℓα at Belle |
| title_fullStr | Search for lepton-flavor-violating tau decays to ℓα at Belle |
| title_full_unstemmed | Search for lepton-flavor-violating tau decays to ℓα at Belle |
| title_short | Search for lepton-flavor-violating tau decays to ℓα at Belle |
| title_sort | search for lepton flavor violating tau decays to lα at belle |
| topic | e +-e − Experiments Tau Physics |
| url | https://doi.org/10.1007/JHEP08(2025)155 |
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