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2021•DESY Publication Database (PUBDB) (Deutsches Elektronen-Synchrotron)Open access

Measurement of Differential Branching Fractions of Inclusive ${B \to X_u \, \ell^+\, \nu_{\ell}}$ Decays

L. Cao, W. Sutcliffe, R. van Tonder, F. U. Bernlochner, I. Adachi, H. Aihara, D. M. Asner, T. Aushev, Ayad, R., V. Babu, S. Bahinipati, P. K. Behera, Belous, K., J. V. Bennett, M. Bessner, T. Bilka, J. P. Biswal, A. Bobrov, Bračko, M., Branchini, P., Browder, T. E., A. Budano, Campajola, M., D. Červenkov, M.-C. Chang, P. Chang, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, T. Czank, N. Dash, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Doležal, Z., T. V. Dong, S. Dubey, Epifanov, D., Ferber, T., D. Ferlewicz, Frey, A., B. G. Fulsom, Renu Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, T. Gu, K. Gudkova, S. Halder, T. Hara, Hartbrich, O., K. Hayasaka, M. Hernández Villanueva, Hou, W.-S., C.-L. Hsu, Inami, K., Ishikawa, A., Itoh, R., M. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, J. Kahn, K. H. Kang, H. Kichimi, C. Kiesling, C. H. Kim, D. Y. Kim, S. H. Kim, Y.-K. Kim, T. D. Kimmel, K. Kinoshita, Kodyš, P., T. Konno, A. Korobov, S. Korpar, Kovalenko, E., P. Križan, R. Kroeger, Krokovny, P., T. Kuhr, R. Kulasiri, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, S. C. Lee, C. H. Li, J. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, Lieret, K., D. Liventsev, C. MacQueen, M. Masuda, M. Merola, Metzner, F., K. Miyabayashi, Mizuk, R., G. B. Mohanty, Mohanty, S., M. Mrvar, M. Nakao, A. Natochii, L. Nayak, M. Niiyama, Nisar, N. K., Nishida, S., K. Nishimura, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, A. Passeri, S. Patra, S. Paul, Pedlar, T. K., L. E. Piilonen, T. Podobnik, Popov, V., E. Prencipe, M. T. Prim, Röhrken, M., Rostomyan, A., N. Rout, M. Różańska, Russo, G., D. Sahoo, Sandilya, S., A. Sangal, L. Šantelj, T. Sanuki, Savinov, V., G. Schnell, J. Schueler, C. Schwanda, A. J. Schwartz, Y. Seino, Senyo, K., M. E. Sevior, M. Shapkin, Sharma, C., C. P. Shen, J.-G. Shiu, Shwartz, B., Simon, F., A. Sokolov, E. Solovieva, M. Starič, J. Strube, M. Sumihama, Sumiyoshi, T., Takizawa, M., Tamponi, U., K. Tanida, Y. Tao, Tenchini, F., K. Trabelsi, M. Uchida, T. Uglov, Uno, S., P. Urquijo, Vahsen, S. E., G. Varner, Varvell, K. E., E. Waheed, C. H. Wang, E. Wang, M.-Z. Wang, Ping Wang, X. L. Wang, M. Watanabe, S. Watanuki, O. Werbycka, Won, E., B. Yabsley, Yan, W., Yang, S. B., H. Ye, Yin, J. H., Z. P. Zhang, V. Zhilich, V. Zhukova

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Abstract

The first measurements of differential branching fractions of inclusive semileptonic ${B \to X_u \, \ell^+\, \nu_{\ell}}$ decays are performed using the full Belle data set of 711 fb$^{-1}$ of integrated luminosity at the $ϒ(4S)$ resonance and for $ℓ=e, μ$. With the availability of these measurements, new avenues for future shape-function model-independent determinations of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$ can be pursued to gain new insights in the existing tension with respect to exclusive determinations. The differential branching fractions are reported as a function of the lepton energy, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic ${B \to X_c \, \ell^+\, \nu_{\ell}}$ decays and other processes, and corrected for resolution and acceptance effects.

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What this paper is about

The first measurements of differential branching fractions of inclusive semileptonic ${B \to X_u \, \ell^+\, \nu_{\ell}}$ decays are performed using the full Belle data set of 711 fb$^{-1}$ of integrated luminosity at the $ϒ(4S)$ resonance and for $ℓ=e, μ$. With the availability of these measurements, new avenues for future shape-function model-independent determinations of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$ can be pursued to gain new insights in the existing tension with respect to exclusive determinations. The differential branching fractions are reported as a function of the lepton energy, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic ${B \to X_c \, \ell^+\, \nu_{\ell}}$ decays and other processes, and corrected for resolution and acceptance effects.

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Available abstract

The first measurements of differential branching fractions of inclusive semileptonic ${B \to X_u \, \ell^+\, \nu_{\ell}}$ decays are performed using the full Belle data set of 711 fb$^{-1}$ of integrated luminosity at the $ϒ(4S)$ resonance and for $ℓ=e, μ$. With the availability of these measurements, new avenues for future shape-function model-independent determinations of the Cabibbo-Kobayashi-Maskawa matrix element $|V_{ub}|$ can be pursued to gain new insights in the existing tension with respect to exclusive determinations. The differential branching fractions are reported as a function of the lepton energy, the four-momentum-transfer squared, light-cone momenta, the hadronic mass, and the hadronic mass squared. They are obtained by subtracting the backgrounds from semileptonic ${B \to X_c \, \ell^+\, \nu_{\ell}}$ decays and other processes, and corrected for resolution and acceptance effects.

Key concepts: Physics, Particle physics, Hadron, Semileptonic decay, Lepton, Branching fraction, Momentum transfer, Luminosity

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