Measurement of the branching ratio of bar{B} to D^{(ast)} τ^- bar{ν}_τ relative to bar{B} to D^{(ast)} ell^- bar{ν}_ell decays with hadronic tagging at Belle

Belle Collaboration: M. Huschle , T. Kuhr , M. Heck , P. Goldenzweig , A. Abdesselam , I. Adachi , K. Adamczyk , H. Aihara

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S. Al Said K. Arinstein D. M. Asner T. Aushev R. Ayad T. Aziz I. Badhrees A. M. Bakich V. Bansal E. Barberio V. Bhardwaj B. Bhuyan J. Biswal A. Bobrov A. Bozek M. Bra\v{c}ko T. E. Browder D. \v{C}ervenkov P. Chang V. Chekelian A. Chen B. G. Cheon K. Chilikin R. Chistov K. Cho V. Chobanova Y. Choi D. Cinabro J. Dalseno M. Danilov Z. Dole\v{z}al Z. Dr\'asal D. Dutta S. Eidelman D. Epifanov H. Farhat J. E. Fast T. Ferber A. Frey B. G. Fulsom V. Gaur N. Gabyshev A. Garmash R. Gillard R. Glattauer Y. M. Goh B. Golob J. Grygier P. Hamer K. Hara T. Hara J. Hasenbusch K. Hayasaka H. Hayashii X. H. He M. Heider A. Heller T. Horiguchi W.-S. Hou C.-L. Hsu T. Iijima K. Inami G. Inguglia A. Ishikawa R. Itoh Y. Iwasaki I. Jaegle D. Joffe K. K. Joo T. Julius K. H. Kang E. Kato P. Katrenko T. Kawasaki T. Keck C. Kiesling D. Y. Kim H. J. Kim J. B. Kim J. H. Kim K. T. Kim M. J. Kim S. H. Kim Y. J. Kim K. Kinoshita B. R. Ko N. Kobayashi P. Kody\v{s} S. Korpar P. Kri\v{z}an P. Krokovny T. Kumita A. Kuzmin Y.-J. Kwon I. S. Lee C. Li Y. Li L. Li Gioi J. Libby D. Liventsev P. Lukin M. Masuda D. Matvienko K. Miyabayashi H. Miyake H. Miyata R. Mizuk G. B. Mohanty S. Mohanty A. Moll H. K. Moon R. Mussa K. R. Nakamura E. Nakano M. Nakao T. Nanut M. Nayak N. K. Nisar S. Nishida S. Ogawa S. Okuno C. Oswald G. Pakhlova B. Pal C. W. Park H. Park T. K. Pedlar L. Pes\'antez R. Pestotnik M. Petri\v{c} L. E. Piilonen C. Pulvermacher E. Ribe\v{z}l M. Ritter A. Rostomyan Y. Sakai S. Sandilya L. Santelj T. Sanuki Y. Sato V. Savinov O. Schneider G. Schnell C. Schwanda A. J. Schwartz D. Semmler K. Senyo O. Seon M. E. Sevior V. Shebalin C. P. Shen T.-A. Shibata J.-G. Shiu F. Simon Y.-S. Sohn A. Sokolov E. Solovieva S. Stani\v{c} M. Stari\v{c} M. Steder J. Stypula M. Sumihama T. Sumiyoshi U. Tamponi Y. Teramoto K. Trabelsi V. Trusov M. Uchida T. Uglov S. Uno Y. Usov C. Van Hulse P. Vanhoefer G. Varner A. Vinokurova V. Vorobyev M. N. Wagner C. H. Wang M.-Z. Wang P. Wang X. L. Wang M. Watanabe Y. Watanabe E. Won H. Yamamoto J. Yamaoka S. Yashchenko H. Ye Y. Yook C. Z. Yuan Y. Yusa Z. P. Zhang V. Zhilich V. Zhulanov A. Zupanc

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keywords bellebbarbranchingdecayshadronicmeasurementnubarrelative

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We report a measurement of the branching fraction ratios R(D(*)) of Bbar -> D(*) tau- nubar_tau relative to Bbar -> D()* l- nubar_l (where l = e or mu) using the full Belle data sample of 772 x 10^6 BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. The measured values are R(D)= 0.375 +- 0.064(stat.) +- 0.026(syst.) and R(D*) = 0.293 +- 0.038(stat.) +- 0.015(syst.). The analysis uses hadronic reconstruction of the tag-side B meson and purely leptonic tau decays. The results are consistent with earlier measurements and do not show a significant deviation from the standard model prediction.

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hep-ph 2026-05 unverdicted novelty 4.0

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hep-ph 2026-05 unverdicted novelty 4.0

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