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1. Search for charged lepton flavor violating decays of ϒ (1S)

Author

The BELLE collaboration, S. Patra, V. Bhardwaj, K. Trabelsi, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, K. Belous, J. Bennett, M. Bessner, B. Bhuyan, T. Bilka, A. Bobrov, D. Bodrov, J. Borah, A. Bozek, M. Bračko, P. Branchini, T. E. Browder, A. Budano, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-J. Cho, S.-K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Das, G. De Nardo, G. De Pietro, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Epifanov, T. Ferber, A. Frey, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Giri, P. Goldenzweig, E. Graziani, T. Gu, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, M. Hernandez, Villanueva, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, S. Jia, Y. Jin, K. K. Joo, J. Kahn, A. B. Kaliyar, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, C. H. Kim, D. Y. Kim, K.-H. Kim, K. T. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, T. Konno, A. Korobov, S. Korpar, E. Kovalenko, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, M. Kumar, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, K. Lalwani, T. Lam, J. S. Lange, S. C. Lee, C. H. Li, J. Li, L. K. Li, Y. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, A. Martini, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, R. Mizuk, G. B. Mohanty, R. Mussa, M. Nakao, A. Natochii, L. Nayak, M. Nayak, N. K. Nisar, S. Nishida, K. Ogawa, S. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, T. Pang, S. Pardi, H. Park, S.-H. Park, A. Passeri, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, M. Röhrken, A. Rostomyan, N. Rout, G. Russo, D. Sahoo, S. Sandilya, A. Sangal, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, C. Schwanda, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, C. Sharma, C. P. Shen, J.-G. Shiu, B. Shwartz, F. Simon, J. B. Singh, A. Sokolov, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, M. Sumihama, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, R. Van Tonder, G. Varner, A. Vinokurova, A. Vossen, E. Waheed, C. H. Wang, D. Wang, E. Wang, M.-Z. Wang, S. Watanuki, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Y. Zhai, Z. P. Zhang, V. Zhilich, V. Zhukova, and V. Zhulanov

Subjects
e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present a search for the charged lepton-flavor-violating decays ϒ(1S) → ℓ ± ℓ′∓ and radiative charged lepton-flavour-violating decays ϒ(1S) → γ ℓ ± ℓ′∓ [ℓ,ℓ′ = e, μ, τ] using the 158 million ϒ(2S) sample collected by the Belle detector at the KEKB collider. This search uses ϒ(1S) mesons produced in ϒ(2S) → π + π − ϒ(1S) transitions. We do not find any significant signal, so we provide upper limits on the branching fractions at the 90% confidence level.

Published
2022
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2. Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays

Author

The BELLE collaboration, S. Choudhury, S. Sandilya, K. Trabelsi, A. Giri, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, V. Aulchenko, T. Aushev, R. Ayad, V. Babu, S. Bahinipati, P. Behera, C. Beleño, K. Belous, J. Bennett, F. Bernlochner, M. Bessner, V. Bhardwaj, T. Bilka, J. Biswal, G. Bonvicini, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, D. Červenkov, M.-C. Chang, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, R. Dhamija, F. Di Capua, J. Dingfelder, Z. Doležal, T. V. Dong, D. Dossett, S. Dubey, S. Eidelman, D. Epifanov, T. Ferber, D. Ferlewicz, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, P. Goldenzweig, B. Golob, D. Greenwald, C. Hadjivasiliou, O. Hartbrich, H. Hayashii, M. T. Hedges, M. Hernandez Villanueva, T. Higuchi, W.-S. Hou, C.-L. Hsu, T. Iijima, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, E.-J. Jang, H. B. Jeon, S. Jia, Y. Jin, C. W. Joo, K. K. Joo, J. Kahn, A. B. Kaliyar, K. H. Kang, G. Karyan, H. Kichimi, C. Kiesling, B. H. Kim, D. Y. Kim, K.-H. Kim, K. T. Kim, S. H. Kim, Y.-K. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, R. Kumar, K. Kumara, A. Kuzmin, Y.-J. Kwon, K. Lalwani, S. C. Lee, P. Lewis, C. H. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, Z. Liptak, D. Liventsev, T. Luo, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, S. Mohanty, T. J. Moon, T. Mori, I. Nakamura, K. R. Nakamura, M. Nakao, Z. Natkaniec, A. Natochii, L. Nayak, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Ogawa, H. Ono, Y. Onuki, P. Oskin, P. Pakhlov, G. Pakhlova, S. Pardi, H. Park, S.-H. Park, S. Patra, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, T. Podobnik, V. Popov, E. Prencipe, M. T. Prim, A. Rabusov, A. Rostomyan, N. Rout, M. Rozanska, G. Russo, D. Sahoo, Y. Sakai, L. Santelj, T. Sanuki, V. Savinov, G. Schnell, J. Schueler, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, M. Shapkin, V. Shebalin, J.-G. Shiu, B. Shwartz, F. Simon, A. Sokolov, E. Solovieva, S. Stanič, M. Starič, Z. S. Stottler, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, R. Van Tonder, G. Varner, K. E. Varvell, A. Vinokurova, V. Vorobyev, E. Waheed, C. H. Wang, E. Wang, M.-Z. Wang, P. Wang, M. Watanabe, S. Watanuki, S. Wehle, J. Wiechczynski, E. Won, X. Xu, B. D. Yabsley, W. Yan, S. B. Yang, H. Ye, J. Yelton, J. H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova

Subjects
FCNC Interaction, Flavor physics, Flavour Changing Neutral Currents, B physics, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present measurements of the branching fractions for the decays B → Kμ + μ − and B → Ke + e − , and their ratio (R K ), using a data sample of 711 fb −1 that contains 772 × 106 B B ¯ $$ B\overline{B} $$ events. The data were collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e + e − collider. The ratio R K is measured in five bins of dilepton invariant-mass-squared (q 2): q 2 ∈ (0.1, 4.0), (4.00, 8.12), (1.0, 6.0), (10.2, 12.8) and (> 14.18) GeV2 /c 4, along with the whole q 2 region. The R K value for q 2 ∈ (1.0, 6.0) GeV2 /c 4 is 1.03 − 0.24 + 0.28 $$ {1.03}_{-0.24}^{+0.28} $$ ± 0.01. The first and second uncertainties listed are statistical and systematic, respectively. All results for R K are consistent with Standard Model predictions. We also measure CP-averaged isospin asymmetries in the same q 2 bins. The results are consistent with a null asymmetry, with the largest difference of 2.6 standard deviations occurring for the q 2 ∈ (1.0, 6.0) GeV2 /c 4 bin in the mode with muon final states. The measured differential branching fractions, d ℬ $$ d\mathrm{\mathcal{B}} $$ /dq 2, 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 B 0 → K 0 μ ± e ∓ modes.

Published
2021
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3. First measurement of the CKM angle ϕ 3 with B ± → D( K S 0 $$ {K}_{\mathrm{S}}^0 $$ π + π − π 0) K ± decays

Author

The BELLE collaboration, P. K. Resmi, J. Libby, K. Trabelsi, I. Adachi, H. Aihara, S. Al Said, D. M. Asner, V. Aulchenko, T. Aushev, V. Babu, I. Badhrees, A. M. Bakich, C. Beleño, J. Bennett, V. Bhardwaj, B. Bhuyan, T. Bilka, J. Biswal, A. Bozek, M. Bračko, M. Campajola, D. Červenkov, A. Chen, B. G. Cheon, H. E. Cho, K. Cho, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, F. Di Capua, S. Di Carlo, Z. Doležal, T. V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, R. Garg, V. Gaur, N. Gabyshev, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, Y. Guan, K. Hayasaka, H. Hayashii, W.-S. Hou, K. Huang, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, H. B. Jeon, Y. Jin, D. Joffe, A. B. Kaliyar, K. H. Kang, G. Karyan, T. Kawasaki, C. Kiesling, D. Y. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, D. Kotchetkov, P. Krǐzan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kumar, A. Kuzmin, Y.-J. Kwon, S. C. Lee, Y. B. Li, K. Lieret, D. Liventsev, P.-C. Lu, T. Luo, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, K. Miyabayashi, R. Mizuk, G. B. Mohanty, H. K. Moon, T. Nakano, M. Nakao, K. J. Nath, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, H. Ono, Y. Onuki, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, E. Prencipe, M. T. Prim, M. Ritter, M. Röhrken, G. Russo, D. Sahoo, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, A. J. Schwartz, Y. Seino, K. Senyo, M. E. Sevior, V. Shebalin, C. P. Shen, J.-G. Shiu, B. Shwartz, E. Solovieva, M. Starič, Z. S. Stottler, J. F. Strube, T. Sumiyoshi, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, M. Uchida, T. Uglov, S. Uno, Y. Usov, R. Van Tonder, G. Varner, A. Vinokurova, V. Vorobyev, A. Vossen, B. Wang, C. H. Wang, M.-Z. Wang, X. L. Wang, S. Watanuki, E. Won, S. B. Yang, H. Ye, Z. P. Zhang, V. Zhilich, and V. Zhukova

Subjects
CKM angle gamma, CP violation, e+-e- Experiments, B physics, Flavor physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We present the first model-independent measurement of the CKM unitarity triangle angle ϕ 3 using B ± → D( K S 0 $$ {K}_{\mathrm{S}}^0 $$ π + π − π 0) K ± decays, where D indicates either a D 0 or D ¯ $$ \overline{D} $$ 0 meson. Measurements of the strong-phase difference of the D → K S 0 $$ {K}_{\mathrm{S}}^0 $$ π + π − π 0 amplitude obtained from CLEO-c data are used as input. This analysis is based on the full Belle data set of 772 × 106 B B ¯ $$ \overline{B} $$ events collected at the Υ(4S) resonance. We obtain ϕ 3 = ( 5.7 − 8.8 + 10.2 $$ {5.7}_{-8.8}^{+10.2} $$ ±3.5±5.7) ° and the suppressed amplitude ratio r B = 0.323±0.147±0.023±0.051. Here the first uncertainty is statistical, the second is the experimental systematic, and the third is due to the precision of the strong-phase parameters measured from CLEO-c data. The 95% confidence interval on ϕ 3 is (−29.7, 109.5) ° , which is consistent with the current world average.

Published
2019
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4. Observation of a new structure near 10.75 GeV in the energy dependence of the e + e − → ϒ (nS)π + π − (n = 1, 2, 3) cross sections

Author

The BELLE collaboration, R. Mizuk, A. Bondar, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, R. Ayad, I. Badhrees, S. Bahinipati, A. M. Bakich, P. Behera, C. Beleño, M. Berger, V. Bhardwaj, T. Bilka, J. Biswal, A. Bozek, M. Bračko, T. E. Browder, M. Campajola, L. Cao, D. Červenkov, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S.-K. Choi, Y. Choi, D. Cinabro, S. Cunliffe, N. Dash, G. De Nardo, F. Di Capua, S. Di Carlo, Z. Doležal, T.V. Dong, S. Eidelman, D. Epifanov, J. E. Fast, T. Ferber, B. G. Fulsom, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, O. Grzymkowska, T. Hara, O. Hartbrich, K. Hayasaka, H. Hayashii, W.-S. Hou, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, Y. Jin, D. Joffe, K. K. Joo, K. H. Kang, G. Karyan, T. Kawasaki, H. Kichimi, D. Y. Kim, H. J. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodyš, S. Korpar, D. Kotchetkov, P. Križan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kumar, A. Kuzmin, J. S. Lange, J. Y. Lee, S. C. Lee, L. K. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, T. Luo, J. MacNaughton, C. MacQueen, M. Masuda, T. Matsuda, D. Matvienko, M. Merola, H. Miyata, G. B. Mohanty, T. Mori, R. Mussa, T. Nakano, M. Nakao, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, S. L. Olsen, H. Ono, Y. Onuki, P. Oskin, W. Ostrowicz, P. Pakhlov, G. Pakhlova, B. Pal, T. Pang, S. Pardi, S.-H. Park, S. Paul, T. K. Pedlar, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, M. Ritter, A. Rostomyan, G. Russo, Y. Sakai, M. Salehi, S. Sandilya, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo, O. Seon, M. E. Sevior, V. Shebalin, C. P. Shen, J.-G. Shiu, B. Shwartz, A. Sokolov, E. Solovieva, M. Starič, J. F. Strube, M. Sumihama, T. Sumiyoshi, W. Sutcliffe, M. Takizawa, U. Tamponi, K. Tanida, F. Tenchini, K. Trabelsi, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, S. E. Vahsen, R. Van Tonder, G. Varner, A. Vinokurova, B. Wang, C. H. Wang, M.-Z. Wang, P. Wang, E. Won, S. B. Yang, H. Ye, C. Z. Yuan, Y. Yusa, Z. P. Zhang, V. Zhilich, and V. Zhukova

Subjects
e+-e- Experiments, Quarkonium, Spectroscopy, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract We report a new measurement of the e + e − → ϒ(nS)π + π − (n = 1, 2, 3) cross sections at energies from 10.52 to 11.02 GeV using data collected with the Belle detector at the KEKB asymmetric-energy e + e − collider. We observe a new structure in the energy dependence of the cross sections; if described by a Breit-Wigner function its mass and width are found to be M = 10752.7 ± 5.9 − 1.1 + 0.7 MeV / c 2 $$ M=\left(10752.7\pm {5.9}_{-1.1}^{+0.7}\right)\mathrm{MeV}/{c}^2 $$ and Γ = 35.5 − 11.3 − 3.3 + 17.6 + 3.9 $$ \Gamma =\left({35.5}_{-11.3\kern0.5em -3.3}^{+17.6+3.9}\right) $$ MeV, where the first error is statistical and the second is systematic. The global significance of the new structure including systematic uncertainty is 5.2 standard deviations. We also find evidence for the e + e − → ϒ (1S)π + π − process at the energy 10.52 GeV, which is below the B B ¯ $$ \overline{B} $$ threshold.

Published
2019
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5. Search for CP Violation in the Decay ${D^{+}}\to K_S^0{K^{+}}$

Author

A. Zupanc, A. Ishikawa, O. Nitoh, P. Križan, T. Aushev, G. Schnell, Y. Sakai, H. Hayashii, G. Tatishvili, M. Uchida, M. Shapkin, T. Iijima, M. E. Sevior, C. Liu, D. Cinabro, J. H. Kang, K. T. Kim, R. Gillard, M. Röhrken, K. Chilikin, G. Bonvicini, K. Nishimura, James E. Fast, Sanmay Ganguly, S. Esen, N. Nellikunnummel, E. Solovieva, B. G. Cheon, D. Liventsev, T. Kuhr, Meng Wang, V. Gaur, Y. Watanabe, M. Nakao, D. M. Asner, R. Louvot, S. K. Choi, K. Kinoshita, B. Bhuyan, T. Tsuboyama, P. Krokovny, G. S. Varner, K. Belous, T. E. Browder, S. Korpar, K. Cho, K. Prothmann, Marko Petrič, T.-A. Shibata, R. Pestotnik, Yongsun Kim, E. Kato, C. H. Wang, Yukinori Sato, E. Nakano, J. G. Shiu, H. Aihara, J. Klucar, H. J. Hyun, S. Uno, P. Smerkol, C. Schwanda, P. Wang, H. Sahoo, K. Trabelsi, A.E. Bondar, G. B. Mohanty, S. Okuno, Y. B. Li, V. Bhardwaj, Byeong Rok Ko, H. O. Kim, T. Uglov, C. P. Shen, A.L. Sibidanov, T. K. Pedlar, A. Moll, Dipanwita Dutta, Z. Doležal, Y. Teramoto, S. Nishida, H. Miyata, Y. Hoshi, O. Seon, Frank Simon, Y. Choi, C. C. Zhang, L. Santelj, K. Senyo, K. M. Williams, C. Ng, C. Oswald, A. Chen, K. Hayasaka, V. Chekelian, T. Saito, H. K. Park, Y. Yamashita, C. Kiesling, Yasushi Nagasaka, Y. M. Goh, M. Bračko, S. Eidelman, P. Pakhlov, C. B. Van Hulse, A. M. Bakich, T. Ohshima, N. Gabyshev, H. Park, A. Bozek, A. Kuzmin, S. Ogawa, R. Mizuk, W. S. Hou, K. Arinstein, E. Won, P. Vanhoefer, B. Golob, A. J. Schwartz, V.N. Zhilich, T. Sumiyoshi, Jeremy Dalseno, K. Miyabayashi, Richard T. Kouzes, Martin Ritter, E. Nedelkovska, T. Sanuki, H. Farhat, Norihito Muramatsu, J. B. Kim, Y. S. Sohn, Y. Unno, I. Adachi, L. E. Piilonen, G. Pakhlova, T. Julius, Po-Hsun Chen, R. Chistov, S. Sandilya, M. J. Kim, M. Starič, T. Kumita, Y. Iwasaki, Y. J. Kwon, and O. Schneider

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, media_common.quotation_subject, 01 natural sciences, Asymmetry, law.invention, Luminosity, KEKB, law, 0103 physical sciences, CP violation, 010306 general physics, Collider, Bar (unit), media_common
Abstract

We search for CP violation in the decay ${D^{+}}\to K_S^0{K^{+}}$ using a data sample with an integrated luminosity of 977 fb−1 collected with the Belle detector at the KEKB e + e − asymmetric-energy collider. No CP violation has been observed and the CP asymmetry in ${D^{+}}\to K_S^0{K^{+}}$ decay is measured to be (−0.25 ± 0.28 ± 0.14)%, which is the most sensitive measurement to date. After subtracting CP violation due to ${K^0}-{{\overline{K}}^0}$ mixing, the CP asymmetry in ${D^{+}}\to {{\overline{K}}^0}{K^{+}}$ decay is found to be (+0.08 ± 0.28 ± 0.14)%.

Published
2013
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6. Erratum to: Search for B decays to final states with the η c meson

Author

T. A. Shibata, H. Miyata, S. L. Olsen, K. Hayasaka, A. Bobrov, S. Uno, X. H. He, A. Vinokurova, G. Schnell, D. Cinabro, S. H. Kim, P. Krokovny, M. Bračko, H. Farhat, K. H. Kang, K. Cho, T. Kuhr, M. J. Kim, K. T. Kim, Jung-Hyun Kim, B. R. Ko, T. Kumita, R. Gillard, D. A. Epifanov, J. S. Lange, M. Uchida, T. Aushev, S. K. Choi, J. G. Shiu, T. K. Pedlar, A. Moll, J. Libby, S. Sandilya, Vikas Bansal, Y. S. Sohn, Y. Iwasaki, T. Ferber, E. Nakano, Y. J. Kwon, W. S. Hou, K. Arinstein, H. Miyake, M. Ritter, O. Schneider, D. Semmler, C. Van Hulse, G. S. Varner, S. Eidelman, P. Pakhlov, V. Vorobyev, S. Okuno, H. Hayashii, E. Ribežl, B. G. Cheon, R. Itoh, K. Miyabayashi, H. Park, A. Bozek, S. Nishida, A. M. Bakich, Y. Teramoto, K. Kinoshita, U. Tamponi, A. Drutskoy, Jochen Dingfelder, M. N. Wagner, J. Yamaoka, Z. Natkaniec, B. Bhuyan, E. Kato, M. Starič, D. Liventsev, A. Bondar, Vladimir Zhulanov, Yuki Sato, N. Gabyshev, Rok Pestotnik, Luka Santelj, V. Bhardwaj, M. E. Sevior, E. Won, D. Santel, V. Savinov, T. Sumiyoshi, K. Senyo, Y. Watanabe, T. Sanuki, Y. Choi, N. K. Nisar, C. P. Shen, C. Kiesling, L. E. Piilonen, G. Pakhlova, K. Inami, Iki Adachi, A. Abdesselam, A. Rostomyan, S. Yashchenko, V. Chekelian, V. Gaur, Y. Sakai, T. Julius, Y. M. Goh, P. Vanhoefer, R. Chistov, B. Shwartz, C. H. Wang, G. B. Mohanty, H. J. Kim, Z. Doležal, D. Matvienko, D. Joffe, D. Dutta, R. Ayad, Z. P. Zhang, Samo Stanič, D. Y. Kim, M. Sumihama, T. Mori, H. Aihara, A. Kuzmin, S. Ogawa, J. Haba, T. Uglov, T. E. Browder, K. M. Williams, Z. Drásal, L. Li Gioi, K. Chilikin, P. Lukin, A. Garmash, C. Ng, M. Steder, Peter Kodys, Yoshinobu Unno, V.E. Shebalin, A.L. Sibidanov, Yongsun Kim, C. Schwanda, B. Golob, A. Zupanc, E. Solovieva, G. Tatishvili, O. Seon, Frank Simon, P. L. Wang, M. Petrič, Meng Wang, Andrey Sokolov, D. M. Asner, Samo Korpar, James E. Fast, Y. Yook, R. Mussa, A. Ishikawa, M. Nakao, C. W. Park, and P. Križan

Subjects
Physics, Particle physics, Nuclear and High Energy Physics, Web of science, Meson, 010308 nuclear & particles physics, 0103 physical sciences, ddc:530, 010306 general physics, 01 natural sciences
Abstract

We report a search for $B$ decays to selected final states with the $\eta_c$ meson: $B^{\pm}\to K^{\pm}\eta_c\pi^+\pi^-$, $B^{\pm}\to K^{\pm}\eta_c\omega$, $B^{\pm}\to K^{\pm}\eta_c\eta$ and $B^{\pm}\to K^{\pm}\eta_c\pi^0$. The analysis is based on $772\times 10^6$ $B\bar{B}$ pairs collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. We set 90\% confidence level upper limits on the branching fractions of the studied $B$ decay modes, independent of intermediate resonances, in the range $(0.6-5.3)\times 10^{-4}$. We also search for molecular-state candidates in the $D^0\bar{D}^{*0}-\bar{D}^0D^{*0}$, $D^0\bar{D}^0+\bar{D}^0D^0$ and $D^{*0}\bar{D}^{*0}+\bar{D}^{*0}D^{*0}$ combinations, neutral partners of the $Z(3900)^{\pm}$ and $Z(4020)^{\pm}$, and a poorly understood state $X(3915)$ as possible intermediate states in the decay chain, and set 90\% confidence level upper limits on the product of branching fractions to the mentioned intermediate states and decay branching fractions of these states in the range $(0.6-6.9)\times 10^{-5}$.

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