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Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays
- Choudhury, S.;
- Sandilya, S.;
- Trabelsi, K.;
- Giri, A.;
- Aihara, H.;
- ... Kim, D.Y.;
- 외 218명
WEB OF SCIENCE
52SCOPUS
144초록
We present measurements of the branching fractions for the decays B → Kμ+μ− and B → Ke+e−, and their ratio (RK), using a data sample of 711 fb−1 that contains 772 × 106BB¯ events. The data were collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e− collider. The ratio RK is measured in five bins of dilepton invariant-mass-squared (q2): q2 ∈ (0.1, 4.0), (4.00, 8.12), (1.0, 6.0), (10.2, 12.8) and (> 14.18) GeV2/c4, along with the whole q2 region. The RK value for q2 ∈ (1.0, 6.0) GeV2/c4 is 1.03−0.24+0.28 ± 0.01. The first and second uncertainties listed are statistical and systematic, respectively. All results for RK are consistent with Standard Model predictions. We also measure CP-averaged isospin asymmetries in the same q2 bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q2 ∈ (1.0, 6.0) GeV2/c4 bin in the mode with muon final states. The measured differential branching fractions, dℬ /dq2, are consistent with theoretical predictions for charged B decays, while the corresponding values are below the expectations for neutral B decays. We have also searched for lepton-flavor-violating B → Kμ±e∓ decays and set 90% confidence-level upper limits on the branching fraction in the range of 10−8 for B+ → K+μ±e∓, and B0 → K0μ±e∓ modes. [Figure not available: see fulltext.] © 2021, The Author(s).
키워드
- 제목
- Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays
- 저자
- Choudhury, S.; Sandilya, S.; Trabelsi, K.; Giri, A.; Aihara, H.; Al, Said S.; Asner, D.M.; Atmacan, H.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Bahinipati, S.; Behera, P.; Beleño, C.; Belous, K.; Bennett, J.; Bernlochner, F.; Bessner, M.; Bhardwaj, V.; Bilka, T.; Biswal, J.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T.E.; Campajola, M.; Červenkov, D.; Chang, M.-C.; Chang, P.; Chekelian, V.; Chen, A.; Cheon, B.G.; Chilikin, K.; Cho, K.; Choi, S.-K.; Choi, Y.; Cinabro, D.; Cunliffe, S.; Dash, N.; De, Nardo G.; Dhamija, R.; Di, Capua F.; Dingfelder, J.; Doležal, Z.; Dong, T.V.; Dossett, D.; Dubey, S.; Eidelman, S.; Epifanov, D.; Ferber, T.; Ferlewicz, D.; Fulsom, B.G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Goldenzweig, P.; Golob, B.; Greenwald, D.; Hadjivasiliou, C.; Hartbrich, O.; Hayashii, H.; Hedges, M.T.; Hernandez, Villanueva M.; Higuchi, T.; Hou, W.-S.; Hsu, C.-L.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Jacobs, W.W.; Jang, E.-J.; Jeon, H.B.; Jia, S.; Jin, Y.; Joo, C.W.; Joo, K.K.; Kahn, J.; Kaliyar, A.B.; Kang, K.H.; Karyan, G.; Kichimi, H.; Kiesling, C.; Kim, B.H.; Kim, D.Y.; Kim, K.-H.; Kim, K.T.; Kim, S.H.; Kim, Y.-K.; Kinoshita, K.; Kodyš, P.; Korpar, S.; Kotchetkov, D.; Križan, P.; Kroeger, R.; Krokovny, P.; Kuhr, T.; Kulasiri, R.; Kumar, R.; Kumara, K.; Kuzmin, A.; Kwon, Y.-J.; Lalwani, K.; Lee, S.C.; Lewis, P.; Li, C.H.; Li, L.K.; Li, Y.B.; Li, Gioi L.; Libby, J.; Lieret, K.; Liptak, Z.; Liventsev, D.; Luo, T.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Miyabayashi, K.; Mizuk, R.; Mohanty, G.B.; Mohanty, S.; Moon, T.J.; Mori, T.; Nakamura, I.; Nakamura, K.R.; Nakao, M.; Natkaniec, Z.; Natochii, A.; Nayak, L.; Nayak, M.; Niiyama, M.; Nisar, N.K.; Nishida, S.; Ogawa, K.; Ono, H.; Onuki, Y.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, H.; Park, S.-H.; Patra, S.; Paul, S.; Pedlar, T.K.; Pestotnik, R.; Piilonen, L.E.; Podobnik, T.; Popov, V.; Prencipe, E.; Prim, M.T.; Rabusov, A.; Rostomyan, A.; Rout, N.; Rozanska, M.; Russo, G.; Sahoo, D.; Sakai, Y.; Santelj, L.; Sanuki, T.; Savinov, V.; Schnell, G.; Schueler, J.; Schwanda, C.; Schwartz, A.J.; Seino, Y.; Senyo, K.; Sevior, M.E.; Shapkin, M.; Shebalin, V.; Shiu, J.-G.; Shwartz, B.; Simon, F.; Sokolov, A.; Solovieva, E.; Stanič, S.; Starič, M.; Stottler, Z.S.; Sumiyoshi, T.; Sutcliffe, W.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Uchida, M.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Van, Tonder R.; Varner, G.; Varvell, K.E.; Vinokurova, A.; Vorobyev, V.; Waheed, E.; Wang, C.H.; Wang, E.; Wang, M.-Z.; Wang, P.; Watanabe, M.; Watanuki, S.; Wehle, S.; Wiechczynski, J.; Won, E.; Xu, X.; Yabsley, B.D.; Yan, W.; Yang, S.B.; Ye, H.; Yelton, J.; Yin, J.H.; Yuan, C.Z.; Yusa, Y.; Zhang, Z.P.; Zhilich, V.; Zhukova, V.; The BELLE collaboration
- 발행일
- 2021-03-10
- 유형
- Article
- 권
- 2021
- 호
- 3