CERN Accelerating science

Article
Report number arXiv:2102.00020 ; Belle Preprint 2020-22 ; KEK Preprint 2020-39
Title Measurements of partial branching fractions of inclusive B→Xuℓ+νℓ decays with hadronic tagging
Related titleMeasurements of partial branching fractions of inclusive B→Xuℓ+νℓ decays with hadronic tagging
Author(s)

Cao, L. (Bonn U., HISKP) ; Sutcliffe, W. (Bonn U., HISKP) ; Van Tonder, R. (Bonn U., HISKP) ; Bernlochner, F.U. (Bonn U., HISKP) ; Adachi, I. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Aihara, H. (Tokyo U.) ; Al Said, S. (U. Tabuk ; Jeddah U. ; Minia U.) ; Asner, D.M. (Brookhaven) ; Atmacan, H. (Cincinnati U.) ; Aushev, T. (Higher Sch. of Economics, Moscow) ; Ayad, R. (U. Tabuk) ; Babu, V. (DESY) ; Bauer, M. (KIT, Karlsruhe, EKP) ; Behera, P. (Indian Inst. Tech., Madras) ; Belous, K. (Serpukhov, IHEP) ; Bennett, J. (Mississippi U.) ; Bessner, M. (Hawaii U.) ; Bhardwaj, V. (IISER, Mohali) ; Bilka, T. (Charles U.) ; Biswal, J. (Stefan Inst., Ljubljana) ; Bonvicini, G. (Wayne State U.) ; Bozek, A. (Cracow, INP) ; Bračko, M. (Stefan Inst., Ljubljana ; Maribor U.) ; Browder, T.E. (Hawaii U.) ; Campajola, M. (INFN, Naples ; Naples U. ; Siegen U.) ; Červenkov, D. (Charles U.) ; Chang, M.-C. (Catholic U.) ; Chang, P. (Taiwan, Natl. Taiwan U.) ; Chekelian, V. (Munich, Max Planck Inst.) ; Chen, A. (Taiwan, Natl. Central U.) ; Cheon, B.G. (Hanyang U.) ; Chilikin, K. (Lebedev Inst.) ; Cho, H.E. (Hanyang U.) ; Cho, K. (KISTI, Daejeon) ; Cho, S.-J. (Yonsei U.) ; Choi, S.-K. (Gyeongsang Natl. U.) ; Choi, Y. (Sungkyunkwan U.) ; Choudhury, S. (Indian Inst. Tech., Hyderabad) ; Cinabro, D. (Wayne State U.) ; Cunliffe, S. (DESY) ; Das, S. (MNIT, Jaipur) ; Dash, N. (Indian Inst. Tech., Madras) ; De Nardo, G. (INFN, Naples ; Naples U. ; Siegen U.) ; Di Capua, F. (INFN, Naples ; Naples U. ; Siegen U.) ; Dingfelder, J. (Bonn U., HISKP) ; Doležal, Z. (Charles U.) ; Dong, T.V. (Fudan U.) ; Dubey, S. (Hawaii U.) ; Eidelman, S. (Novosibirsk State U. ; Novosibirsk, IYF ; Lebedev Inst.) ; Epifanov, D. (Novosibirsk State U. ; Novosibirsk, IYF) ; Ferber, T. (DESY) ; Ferlewicz, D. (Melbourne U.) ; Frey, A. (Gottingen U., Zweites Phys. Inst.) ; Fulsom, B.G. (PNL, Richland) ; Garg, R. (Panjab U.) ; Gaur, V. (Virginia Tech. ; Virginia State U.) ; Garmash, A. (Novosibirsk State U. ; Novosibirsk, IYF) ; Giri, A. (Indian Inst. Tech., Hyderabad) ; Goldenzweig, P. (KIT, Karlsruhe, EKP) ; Guan, Y. (Cincinnati U.) ; Hadjivasiliou, C. (PNL, Richland) ; Hara, T. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Hartbrich, O. (Hawaii U.) ; Hayasaka, K. (Niigata U.) ; Hayashii, H. (Nara Women's U.) ; Hedges, M.T. (Hawaii U.) ; Hernandez Villanueva, M. (Mississippi U.) ; Hou, W.-S. (Taiwan, Natl. Taiwan U.) ; Hsu, C.-L. (Sydney U.) ; Iijima, T. (KMI, Nagoya ; Nagoya U.) ; Inami, K. (Nagoya U.) ; Ishikawa, A. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Itoh, R. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Iwasaki, M. (Osaka City U.) ; Iwasaki, Y. (KEK, Tsukuba) ; Jacobs, W.W. (CERN) ; Jang, E.-J. (Gyeongsang Natl. U.) ; Jeon, H.B. (Kyungpook Natl. U.) ; Jia, S. (Fudan U.) ; Jin, Y. (Tokyo U.) ; Joo, C.W. (Tokyo U., IPMU) ; Joo, K.K. (Chonnam Natl. U.) ; Kang, K.H. (Kyungpook Natl. U.) ; Karyan, G. (DESY) ; Kawasaki, T. (Kitasato U.) ; Kichimi, H. (KEK, Tsukuba) ; Kiesling, C. (Munich, Max Planck Inst.) ; Kim, B.H. (Seoul Natl. U.) ; Kim, C.H. (Hanyang U.) ; Kim, D.Y. (SoongSil U.) ; Kim, H.J. (Kyungpook Natl. U.) ; Kim, K.-H. (Yonsei U.) ; Kim, S.H. (Seoul Natl. U.) ; Kim, Y.-K. (Yonsei U.) ; Kinoshita, K. (Cincinnati U.) ; Kodyš, P. (Charles U.) ; Konno, T. (Kitasato U.) ; Korobov, A. (Novosibirsk State U. ; Novosibirsk, IYF) ; Korpar, S. (Stefan Inst., Ljubljana ; Maribor U.) ; Kotchetkov, D. (Hawaii U.) ; Kovalenko, E. (Novosibirsk State U. ; Novosibirsk, IYF) ; Križan, P. (Stefan Inst., Ljubljana ; Ljubljana U.) ; Kroeger, R. (Mississippi U.) ; Krokovny, P. (Novosibirsk State U. ; Novosibirsk, IYF) ; Kuhr, T. (Munich U.) ; Kumar, M. (MNIT, Jaipur) ; Kumar, R. (Punjab Agric. U., Ludhiana) ; Kumara, K. (Wayne State U.) ; Kuzmin, A. (Novosibirsk State U. ; Novosibirsk, IYF) ; Kwon, Y.-J. (Yonsei U.) ; Lalwani, K. (MNIT, Jaipur) ; Lange, J.S. (Giessen U.) ; Lee, I.S. (Hanyang U.) ; Lee, S.C. (Kyungpook Natl. U.) ; Lewis, P. (Bonn U., HISKP) ; Li, C.H. (Liaoning Normal U.) ; Li, J. (Kyungpook Natl. U.) ; Li, L.K. (Cincinnati U.) ; Li, Y.B. (Peking U.) ; Li Gioi, L. (Munich, Max Planck Inst.) ; Libby, J. (Indian Inst. Tech., Madras) ; Lieret, K. (Munich U.) ; Liptak, Z. (Hawaii U.) ; Liventsev, D. (KEK, Tsukuba ; Wayne State U.) ; MacNaughton, J. (Miyazaki U.) ; MacQueen, C. (Melbourne U.) ; Masuda, M. (ERI, Tokyo ; Osaka U., Res. Ctr. Nucl. Phys.) ; Matsuda, T. (Miyazaki U.) ; Matvienko, D. (Novosibirsk State U. ; Novosibirsk, IYF ; Lebedev Inst.) ; Merola, M. (INFN, Naples ; Naples U. ; Siegen U.) ; Metzner, F. (KIT, Karlsruhe, EKP) ; Miyabayashi, K. (Nara Women's U.) ; Mizuk, R. (Higher Sch. of Economics, Moscow ; Lebedev Inst.) ; Mohanty, G.B. (Tata Inst.) ; Moon, T.J. (Seoul Natl. U.) ; Mori, T. (Nagoya U.) ; Mrvar, M. (Vienna, OAW) ; Mussa, R. (INFN, Turin) ; Nakao, M. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Natkaniec, Z. (Cracow, INP) ; Natochii, A. (Hawaii U.) ; Nayak, L. (Indian Inst. Tech., Hyderabad) ; Nayak, M. (Tel Aviv U.) ; Niiyama, M. (Kyoto Sangyo U.) ; Nisar, N.K. (Brookhaven) ; Nishida, S. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Nishimura, K. (Hawaii U.) ; Ogawa, S. (Toho U.) ; Ono, H. (Nippon Dental U. ; Niigata U.) ; Onuki, Y. (Tokyo U.) ; Oskin, P. (Lebedev Inst.) ; Pakhlov, P. (Moscow Phys. Eng. Inst. ; Lebedev Inst.) ; Pakhlova, G. (Higher Sch. of Economics, Moscow ; Lebedev Inst.) ; Pang, T. (Pittsburgh U.) ; Pardi, S. (INFN, Naples) ; Park, C.W. (Sungkyunkwan U.) ; Park, H. (Kyungpook Natl. U.) ; Park, S.-H. (Yonsei U.) ; Patra, S. (IISER, Mohali) ; Paul, S. (Munich, Tech. U. ; Munich, Max Planck Inst.) ; Pedlar, T.K. (Luther Coll.) ; Pestotnik, R. (Stefan Inst., Ljubljana) ; Piilonen, L.E. (Virginia Tech. ; Virginia State U.) ; Podobnik, T. (Stefan Inst., Ljubljana ; Ljubljana U.) ; Popov, V. (Higher Sch. of Economics, Moscow) ; Prencipe, E. (Julich, Forschungszentrum) ; Prim, M.T. (Bonn U., HISKP) ; Ritter, M. (Munich U.) ; Röhrken, M. (DESY) ; Rostomyan, A. (DESY) ; Rout, N. (Indian Inst. Tech., Madras) ; Rozanska, M. (Cracow, INP) ; Russo, G. (Naples U. ; INFN, Naples ; Siegen U.) ; Sahoo, D. (Tata Inst.) ; Sakai, Y. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Sandilya, S. (Indian Inst. Tech., Hyderabad) ; Sangal, A. (Cincinnati U.) ; Santelj, L. (Stefan Inst., Ljubljana ; Ljubljana U.) ; Sanuki, T. (Tohoku U.) ; Savinov, V. (Pittsburgh U.) ; Schnell, G. (IKERBASQUE, Bilbao ; Basque U., Bilbao) ; Schueler, J. (Hawaii U.) ; Schwanda, C. (Vienna, OAW) ; Schwartz, A.J. (Cincinnati U.) ; Seino, Y. (Niigata U.) ; Senyo, K. (Yamagata U.) ; Sevior, M.E. (Melbourne U.) ; Shapkin, M. (Serpukhov, IHEP) ; Sharma, C. (MNIT, Jaipur) ; Shen, C.P. (Fudan U.) ; Shiu, J.-G. (Taiwan, Natl. Taiwan U.) ; Simon, F. (Munich, Max Planck Inst.) ; Sokolov, A. (Serpukhov, IHEP) ; Solovieva, E. (Lebedev Inst.) ; Stanič, S. (Nova Gorica U.) ; Starič, M. (Stefan Inst., Ljubljana) ; Stottler, Z.S. (Virginia Tech. ; Virginia State U.) ; Strube, J.F. (PNL, Richland) ; Sumiyoshi, T. (Tokyo Metropolitan U.) ; Takizawa, M. (Showa Pharmaceutical U. ; Wako, RIKEN ; KEK, Tsukuba) ; Tamponi, U. (INFN, Turin) ; Tanida, K. (JAEA, Ibaraki) ; Tenchini, F. (DESY) ; Trabelsi, K. (IJCLab, Orsay) ; Uchida, M. (Tokyo Inst. Tech.) ; Uglov, T. (Higher Sch. of Economics, Moscow ; Lebedev Inst.) ; Unno, Y. (Hanyang U.) ; Uno, S. (Sokendai, Kanagawa ; KEK, Tsukuba) ; Urquijo, P. (Melbourne U.) ; Usov, Y. (Novosibirsk State U. ; Novosibirsk, IYF) ; Vahsen, S.E. (Hawaii U.) ; Varner, G. (Hawaii U.) ; Varvell, K.E. (Sydney U.) ; Vinokurova, A. (Novosibirsk State U. ; Novosibirsk, IYF) ; Vorobyev, V. (Novosibirsk State U. ; Novosibirsk, IYF ; Lebedev Inst.) ; Vossen, A. (Duke U.) ; Waheed, E. (KEK, Tsukuba) ; Wang, C.H. (Natl. United U., Taiwan) ; Wang, E. (Pittsburgh U.) ; Wang, M.-Z. (Taiwan, Natl. Taiwan U.) ; Wang, P. (Beijing, Inst. High Energy Phys.) ; Watanabe, M. (Niigata U.) ; Watanuki, S. (IJCLab, Orsay) ; Wehle, S. (DESY) ; Wiechczynski, J. (Cracow, INP) ; Won, E. (Korea U.) ; Xu, X. (Suzhou, Soochow U.) ; Yabsley, B.D. (Sydney U.) ; Yan, W. (CUST, SKLPDE) ; Yang, S.B. (Korea U.) ; Ye, H. (DESY) ; Yin, J.H. (Korea U.) ; Yuan, C.Z. (Beijing, Inst. High Energy Phys.) ; Yusa, Y. (Niigata U.) ; Zhang, Z.P. (CUST, SKLPDE) ; Zhilich, V. (Novosibirsk State U. ; Novosibirsk, IYF) ; Zhukova, V. (Lebedev Inst.) ; Zhulanov, V. (Novosibirsk State U. ; Novosibirsk, IYF)

Publication 2021-07-01
Imprint 2021-01-29
Number of pages 34
Note 34 pages, 23 figures, 7 tables. Accepted by Phys. Rev. D
In: Phys. Rev. D 104 (2021) 012008
DOI 10.1103/PhysRevD.104.012008 (publication)
Subject category hep-ex ; Particle Physics - Experiment
Accelerator/Facility, Experiment KEK BF BELLE
Abstract We present measurements of partial branching fractions of inclusive semileptonic $B \to X_u \, \ell^+\, \nu_{\ell}$ decays using the full Belle data set of 711 fb$^{-1}$ of integrated luminosity at the $\Upsilon(4S)$ resonance and for $\ell = e, \mu$. Inclusive semileptonic $B \to X_u \, \ell^+\, \nu_{\ell}$ decays are CKM suppressed and measurements are complicated by the large background from CKM-favored $B \to X_c \, \ell^+\, \nu_{\ell}$ transitions, which have a similar signature. Using machine learning techniques, we reduce this and other backgrounds effectively, whilst retaining access to a large fraction of the $B \to X_u \, \ell^+\, \nu_{\ell}$ phase space and high signal efficiency. We measure partial branching fractions in three phase-space regions covering about $31\%$ to $86\%$ of the accessible $B \to X_u \, \ell^+\, \nu_{\ell}$ phase space. The most inclusive measurement corresponds to the phase space with lepton energies of $E_\ell^B > 1 $ GeV, and we obtain $\Delta \mathcal{B}(B \to X_u \ell^+ \, \nu_\ell) = \left( 1.59 \pm 0.07 \pm 0.16 \right) \times 10^{-3}$ from a two-dimensional fit of the hadronic mass spectrum and the four-momentum-transfer squared distribution, with the uncertainties denoting the statistical and systematic error. We find $\left| V_{ub} \right| = \left( 4.10 \pm 0.09 \pm 0.22 \pm 0.15 \right) \times 10^{-3}$ from an average of four calculations for the partial decay rate with the third uncertainty denoting the average theory error. This value is higher but compatible with the determination from exclusive semileptonic decays within 1.3 standard deviations. In addition, we report charmless inclusive partial branching fractions separately for $B^+$ and $B^0$ mesons as well as for electron and muon final states. No isospin breaking or lepton flavor universality violating effects are observed.
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publication: Published by the American Physical Society (License: CC BY 4.0)



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