Test of Light-Lepton Universality in the Rates of Inclusive Semileptonic 
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-Meson Decays at Belle II

Aggarwal, L.; Ahmed, H.; Aihara, H.; Акопов, Н.; Aloisio, A.; Ky, N. Anh; Asner, D. M.; Atmacan, H.; Aushev, T.; Aushev, V.; Bae, H.; Bahinipati, S.; Bambade, P.; Banerjee, S.; Bansal, S.; Barrett, M.; Baudot, J.; Bauer, M.; Baur, A.; Beaubien, A.; Becker, J.; Bennett, J. V.; Bernieri, E.; Bernlochner, F. U.; Bertacchi, V.; Bertemes, M.; Bertholet, E.; Bessner, M.; Bettarini, S.; Bhardwaj, V.; Bhuyan, B.; Bianchi, F.; Bilka, T.; Bilokin, S.; Biswas, D.; Bodrov, D.; Borah, J.; Bożek, A.; Bračko, M.; Briere, R. A.; Browder, T. E.; Budano, A.; Bussino, S.; Campajola, M.; Cao, L.; Casarosa, G.; Cecchi, C.; Cerasoli, J.; Chang, M. C.; Cheaib, R.; Cheema, P.; Chekelian, V.; Cheon, B. G.; Chilikin, K.; Chirapatpimol, K.; Cho, H. E.; Cho, Kihyeon; Cho, S.-J.; Choi, S. K.; Choudhury, S.; Cochran, J.; Corona, L.; Cunliffe, S.; Dattola, F.; Cruz-Burelo, E. De La; Motte, S. A. De La; Nardo, G. De; Nuccio, M. De; Pietro, G. De; Sangro, R. de; Destefanis, M.; Dhamija, R.; Capua, F. Di; Dingfelder, J.; Doležal, Z.; Dong, T. V.; Dorigo, M.; Dossett, D.; Dreyer, S.; Dubey, S.; Dujany, G.; Ecker, P.; Eliachevitch, M.; Feichtinger, P.; Ferber, T.; Ferlewicz, D.; Fillinger, T.; Finocchiaro, G.; Fodor, A.; Forti, F.; Frey, A.; Fulsom, B. G.; Gabrielli, A.; Ganiev, E.; Garcia-Hernández, M.; Gaudino, G.; Gaur, V.; Gaz, A.; Gellrich, A.; Ghevondyan, G.; Giordano, R.; Giri, A.; Glazov, A.; Gobbo, B.; Godang, R.; Goldenzweig, P.; Gradl, W.; Grammatico, T.; Granderath, S.; Graziani, E.; Gruberová, Z.; Gu, T.; Gudkova, K.; Halder, S.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hazra, S.; Hearty, C.; Hedges, M. T.; Cruz, I. Heredia-De La; Villanueva, M. Hernández; Hershenhorn, A. D.; Lai, Y.-T.; Hill, E.; Hohmann, M.; Hsu, C.-L.; Iijima, T.; Inami, K.; Inguglia, G.; Ipsita, N.; Ishikawa, A.; Ito, S.; Itoh, R.; Iwasaki, M.; Jacobs, W. W.; Jang, E.-J.; Ji, Q.; Jia, S.; Jin, Y.; Junkerkalefeld, H.; Kaleta, M.; Kaliyar, A. B.; Karyan, G.; Kawasaki, T.; Kiesling, C.; Kim, C. H.; Kim, D. Y.; Kim, K.-H.; Kim, Y.-K.; Kindo, H.; Kinoshita, K.; Kodyš, P.; Kohani, S.; Kojima, Kentaro; Korobov, A.; Korpar, S.; Kovalenko, E.; Kowalewski, R.; Križan, P.; Krokovny, P.; Kumar, J.; Kumar, Rajeev; Kumara, K.; Kuzmin, A.; Kwon, Y. J.; Lacaprara, S.; Lange, J. S.; Laurenza, M.; Leboucher, R.; Diberder, F. Le; Levit, D.; Lewis, P.; Li, L. K.; Libby, J.; Liptak, Z.; Liu, Q. Y.; Liu, Z. Q.; Liventsev, D.; Longo, S.; Lueck, T.; Lyu, C.; Ma, Y.; Maggiora, M.; Maharana, S. P.; Maiti, R.; Maity, S.; Manfredi, R.; Manoni, E.; Manthei, A. C.; Mantovano, M.; Mariñas, C.; Martel, L.; Martellini, Cristina; Martini, A.; Massaccesi, L.; Masuda, M.; Matsuoka, K.; Matvienko, D.; Maurya, S. K.; McKenna, J. A.; Meier, F.; Merola, M.; Metzner, F.; Milesi, M.; Miller, C.; Miyabayashi, K.; Mizuk, R.; Mohanty, G. B.; Moneta, S.; Mrvar, M.; Mussa, R.; Nakamura, I.; Nakamura, K. R.; Nakao, M.; Nakazawa, Yu; Charan, A. Narimani; Naruki, M.; Narwal, D.; Natochii, A.; Nayak, L.; Nazaryan, G.; Nisar, N. K.; Nishida, S.; Ono, H.; Onuki, Y.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Paladino, A.; Panta, A.; Pardi, S.; Park, H.; Park, J.; Paschen, B.; Passeri, A.; Patra, S.; Paul, S.; Pedlar, T. K.; Peruzzi, I. M.; Peschke, R.; Pestotnik, R.; Piilonen, L. E.; Angioni, G. Pinna; Podesta-Lerma, P. L.M.; Podobnik, T.; Pokharel, S.; Polat, L.; Praz, C.; Prell, S.; Prencipe, E.; Prim, M. T.; Purwar, Harsh; Rad, N.; Rados, P.; Raeuber, G.; Reif, M.; Reiter, S.; Ripp-Baudot, I.; Rizzo, G.; Rizzuto, L. B.; P., Rocchetti,; Roney, J. M.; Rostomyan, A.; Rout, N.; Sanders, D. A.; Sandilya, S.; Sangal, A.; Šantelj, L.; Sato, Y.; Scavino, B.; Schwanda, C.; Seino, Y.; Selce, A.; Senyo, K.; Sevior, M. E.; Sfienti, C.; Shan, W.; Sharma, C.; Shen, C. P.; Shillington, T.; Shiu, J. G.; Simon, F.; Singh, J. B.; Skorupa, J.; Sobie, R.; Soffer, A.; Sokolov, A.; Solovieva, E.; Spataro, S.; Spruck, B.; Starič, M.; Stefkova, S.; Stroili, R.; Sue, Y.; Sumihama, M.; Sutcliffe, W.; Suzuki, Shoji; Svidras, H.; Takizawa, M.; Tamponi, U.; Tanida, K.; Taniguchi, N.; Tenchini, F.; Tiwary, R.; Tonelli, D.; Torassa, E.; Trabelsi, K.; Tsaklidis, I.; Ueda, I.; Uematsu, Y.; Uglov, T.; Unger, K.; Unno, Y.; Uno, K.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Vahsen, S.; Tonder, R. Van; Varner, G.; Varvell, K. E.; Vinokurova, A.; Vismaya, V. S.; Vitale, L.; Vossen, A.; Wallner, S.; Wang, E.; Wang, M.-Z.; Wang, X. L.; Warburton, A.; Watanabe, M.; Watanuki, S.; Welsch, M.; Wessel, C.; Won, E.; Xu, X. P.; Yabsley, B.; Yamada, S.; Yan, W. B.; Yang, S. B.; Ye, H.; Yin, J. H.; Yook, Y.; Yoshihara, K.; Zhai, Y.; Zhang, Y.; Zhilich, V.; Zhou, Q.; Zhou, Xingyu; Zhukova, V.; Žlebčík, R.

doi:10.1103/physrevlett.131.051804

Cited by 10 publications

(1 citation statement)

References 34 publications

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“…In this analysis, published in Ref. [28], we report the first measurement of the inclusive ratio of branching fractions 𝑅(𝑋…”

Section: Measurement Of the Inclusive Ratio 𝑅(𝑋 𝑒/𝜇 )mentioning

confidence: 99%

Lepton universality tests and searches for new physics in charged current decays at Belle II

Junkerkalefeld

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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We present recent tests of lepton universality as crucial probes of the Standard Model in semileptonic 𝐵-meson decays at Belle II. All presented analyses use a data sample collected at the 𝛶(4𝑆) resonance by the Belle II experiment corresponding to an integrated luminosity of 189 fb −1 . We report three analyses that probe light-lepton universality: The first measurement of a complete set of five angular asymmetries using 𝐵 0 → 𝐷 * + ℓ − 𝜈 ℓ decays, followed by a measurement of the forward-backward asymmetry in untagged 𝐵 0 → 𝐷 * + ℓ − 𝜈 ℓ decays, and finally, measurements of the branching-fraction ratios 𝑅(𝐷 * + 𝑒/𝜇 ) = B (𝐵 0 → 𝐷 * + 𝑒 − 𝜈 𝑒 )/B (𝐵 0 → 𝐷 * + 𝜇 − 𝜈 𝜇 ), using the same untagged data set, along with the first measurement of the inclusive light-lepton ratio 𝑅(𝑋 𝑒/𝜇 ) = B (𝐵 → 𝑋𝑒 − 𝜈 𝑒 )/B (𝐵 → 𝑋 𝜇 − 𝜈 𝜇 ). Furthermore, we present two tests of heavy-to-light lepton universality. In the first test, we report the measurement of the branching-fraction ratio 𝑅(𝐷 * 𝜏/ℓ ) using hadronic tagging. In the second test, we present the first measurement of the inclusive ratio 𝑅(𝑋 𝜏/ℓ ). All presented results are consistent with their corresponding Standard Model predictions and, where applicable, with the experimental world averages.

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“…In this analysis, published in Ref. [28], we report the first measurement of the inclusive ratio of branching fractions 𝑅(𝑋…”

Section: Measurement Of the Inclusive Ratio 𝑅(𝑋 𝑒/𝜇 )mentioning

confidence: 99%

Lepton universality tests and searches for new physics in charged current decays at Belle II

Junkerkalefeld

2024

Proceedings of 16th International Conference on Heavy Quarks and Leptons — PoS(HQL2023)

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Flavour physics as a window to new physics searches

Križan

2023

Phil. Trans. R. Soc. A.

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Flavour physics is one of the essential elements of the Standard Model (SM). Experimental studies of weak decays of B and D mesons at B factories have, together with the discovery of the Higgs boson at LHC, provided the final confirmation of the validity of the SM. The present generation of precision flavour physics experiments is looking for departures from the SM. We discuss studies of anomalies in b hadron decays, and studies of rare decays, which are a very promising method for searching for new physics. This article is part of the theme issue ‘The particle-gravity frontier’.

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Standard Model Stays Strong for Leptons

Wright¹

2023

Physics

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Test of Light-Lepton Universality in the Rates of Inclusive Semileptonic B -Meson Decays at Belle II

Cited by 10 publications

References 34 publications

Lepton universality tests and searches for new physics in charged current decays at Belle II

Lepton universality tests and searches for new physics in charged current decays at Belle II

Flavour physics as a window to new physics searches

Standard Model Stays Strong for Leptons

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