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1. Test of lepton flavor universality and search for lepton flavor violation in $B \to K \ell\ell$ decays

Author

Abdesselam, A., Adachi, I., Adamczyk, K., Ahn, J.K., Aihara, H., Al Said, S., Arinstein, K., Arita, Y., Asner, D.M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Aziz, T., Babu, V., Badhrees, I., Bahinipati, S., Bakich, A.M., Ban, Y., Bansal, V., Barberio, E., Barrett, M., Bartel, W., Behera, P., Beleño, C., Belous, K., Bennett, J., Berger, M., Bernlochner, F., Besson, D., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bloomfield, T., Bobrov, A., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Braun, N., Breibeck, F., Browder, T.E., Campajola, M., Cao, L., Caria, G., Červenkov, D., Chang, M.-C., Chang, P., Chao, Y., Cheaib, R., Chekelian, V., Chen, A., Chen, K.-F., Chen, Y., Cheon, B.G., Chilikin, K., Chistov, R., Cho, H.E., Cho, K., Chobanova, V., Choi, S.-K., Choi, Y., Choudhury, S., Cinabro, D., Crnkovic, J., Cunliffe, S., Czank, T., Danilov, M., Dash, N., De Nardo, G., Di Carlo, S., Di Capua, F., Dingfelder, J., Doležal, Z., Dong, T.V., Dossett, D., Drásal, Z., Drutskoy, A., Dubey, S., Dutta, D., Eidelman, S., Epifanov, D., Fast, J.E., Feindt, M., Ferber, T., Frey, A., Frost, O., Fulsom, B.G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Gemmler, J., Getzkow, D., Giordano, F., Giri, A., Goldenzweig, P., Golob, B., Greenwald, D., Grosse Perdekamp, M., Grygier, J., Grzymkowska, O., Guan, Y., Guido, E., Guo, H., Haba, J., Hamer, P., Hara, K., Hara, T., Hartbrich, O., Hasegawa, Y., Hasenbusch, J., Hayasaka, K., Hayashii, H., He, X.H., Heck, M., Hedges, M.T., Heffernan, D., Heider, M., Heller, A., Higuchi, T., Hirose, S., Hoshi, Y., Hoshina, K., Hou, W.-S., Hsiung, Y.B., Hsu, C.-L., Huang, K., Huschle, M., Igarashi, Y., Iijima, T., Imamura, M., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Iwata, S., Jacobs, W.W., Jaegle, I., Jang, E.-J., Jeon, H.B., Jia, S., Jin, Y., Joffe, D., Jones, M., Joo, C.W., Joo, K.K., Julius, T., Kahn, J., Kakuno, H., Kaliyar, A.B., Kang, J.H., Kang, K.H., Kapusta, P., Karyan, G., Kataoka, S.U., Kato, Y., Katrenko, P., Kawai, H., Kawasaki, T., Keck, T., Kichimi, H., Kiesling, C., Kim, B.H., Kim, C.H., Kim, D.Y., Kim, H.-J., Kim, J.B., Kim, K.T., Kim, S.H., Kim, S.K., Kim, Y.J., Kimmel, T., Kindo, H., Kinoshita, K., Kleinwort, C., Klucar, J., Kobayashi, N., Kodyš, P., Koga, Y., Konno, T., Korpar, S., Kotchetkov, D., Kouzes, R.T., Križan, P., Kroeger, R., Krohn, J.-F., Krokovny, P., Kronenbitter, B., Kuhr, T., Kulasiri, R., Kumar, R., Kumita, T., Kurihara, E., Kuroki, Y., Kuzmin, A., Kvasnička, P., Kwon, Y.-J., Lai, Y.-T., Lalwani, K., Lange, J.S., Lee, I.S., Lee, J.K., Lee, J.Y., Lee, S.C., Leitgab, M., Leitner, R., Levit, D., Lewis, P., Li, C.H., Li, H., Li, L.K., Li, Y.B., Li Gioi, L., Libby, J., Lieret, K., Limosani, A., Liptak, Z., Liu, C., Liu, Y., Liventsev, D., Loos, A., Louvot, R., Lu, P.-C., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., McNeil, J.T., Merola, M., Metzner, F., Miyabayashi, K., Miyachi, Y., Miyake, H., Miyata, H., Miyazaki, Y., Mizuk, R., Mohanty, G.B., Mohanty, S., Moon, H.K., Moon, T.J., Mori, T., Morii, T., Moser, H.-G., Mrvar, M., Müller, T., Muramatsu, N., Mussa, R., Nagasaka, Y., Nakahama, Y., Nakamura, I., Nakamura, K.R., Nakano, E., Nakano, T., Nakao, M., Nakayama, H., Nakazawa, H., Nanut, T., Nath, K.J., Natkaniec, Z., Nayak, M., Neichi, K., Ng, C., Niebuhr, C., Niiyama, M., Nisar, N.K., Nishida, S., Nishimura, K., Nitoh, O., Ogawa, A., Ogawa, K., Ogawa, S., Ohshima, T., Okuno, S., Olsen, S.L., Ono, H., Onuki, Y., Ostrowicz, W., Oswald, C., Ozaki, H., Pakhlov, P., Pakhlova, G., Pal, B., Pang, T., Panzenböck, E., Pardi, S., Park, C.-S., Park, H., Park, K.S., Park, S.-H., Patra, S., Paul, S., Pavelkin, I., Pedlar, T.K., Peng, T., Pesántez, L., Pestotnik, R., Peters, M., Piilonen, L.E., Popov, V., Prasanth, K., Prencipe, E., Prim, M.T., Prothmann, K., Purohit, M.V., Rabusov, A., Rauch, J., Reisert, B., Resmi, P.K., Ribežl, E., Ritter, M., Rorie, J., Rostomyan, A., Rozanska, M., Russo, G., Sahoo, D., Sahoo, H., Sakai, Y., Salehi, M., Sandilya, S., Santel, D., Santelj, L., Sanuki, T., Sasaki, J., Sasao, N., Sato, Y., Savinov, V., Schlüter, T., Schneider, O., Schnell, G., Schram, M., Schueler, J., Schwanda, C., Schwartz, A.J., Schwenker, B., Seidl, R., Seino, Y., Semmler, D., Senyo, K., Seon, O., Seong, I.S., Sevior, M.E., Shang, L., Shapkin, M., Shebalin, V., Shen, C.P., Shibata, T.-A., Shibuya, H., Shinomiya, S., Shiu, J.-G., Shwartz, B., Sibidanov, A., Simon, F., Singh, J.B., Sinha, R., Smith, K., Sokolov, A., Soloviev, Y., Solovieva, E., Stanič, S., Starič, M., Steder, M., Stottler, Z., Strube, J.F., Stypula, J., Sugihara, S., Sugiyama, A., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Suzuki, K., Suzuki, S.Y., Takeichi, H., Takizawa, M., Tamponi, U., Tanaka, M., Tanaka, S., Tanida, K., Taniguchi, N., Tao, Y., Taylor, G.N., Tenchini, F., Teramoto, Y., Trabelsi, K., Tsuboyama, T., Uchida, M., Ueda, I., Uehara, S., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Ushiroda, Y., Usov, Y., Vahsen, S.E., Van Hulse, C., Van Tonder, R., Vanhoefer, P., Varner, G., Varvell, K.E., Vervink, K., Vinokurova, A., Vorobyev, V., Vossen, A., Wagner, M.N., Waheed, E., Wang, Biao, Wang, C.H., Wang, M.-Z., Wang, P., Wang, X.L., Watanabe, M., Watanabe, Y., Watanuki, S., Wedd, R., Wehle, S., Widmann, E., Wiechczynski, J., Williams, K.M., Won, E., Yabsley, B.D., Yamada, S., Yamamoto, H., Yamashita, Y., Yang, S.B., Yashchenko, S., Ye, H., Yelton, J., Yin, J.H., Yook, Y., Yuan, C.Z., Yusa, Y., Zakharov, S., Zhang, C.C., Zhang, J., Zhang, L.M., Zhang, Z.P., Zhao, L., Zhilich, V., Zhukova, V., Zhulanov, V., Zivko, T., Zupanc, A., Zwahlen, N., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), and BELLE

Subjects
FCNC Interaction, Upsilon(10570): electroproduction, dilepton: mass spectrum, B: semileptonic decay, Flavour Changing Neutral Currents, isospin: asymmetry, e+-e− Experiments, FOS: Physical sciences, BELLE, B: branching ratio: measured, electron positron: annihilation, B physics, High Energy Physics - Experiment, electron: pair production, Flavor physics, High Energy Physics - Experiment (hep-ex), KEK-B, lepton: flavor: universality, +K+electron+positron%22">B --> K electron positron, +K+muon%2B+muon%22">B --> K muon+ muon, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], B: pair production, branching ratio: ratio: measured, electron positron: colliding beams, mass dependence, muon: pair production, muon: final state, statistical, experimental results
Abstract

We present measurements of the branching fractions for the decays $B\to K \mu^{+}\mu^{-}$ and $B\to K e^{+}e^{-}$, and their ratio ($R_{K}$), using a data sample of 711 $fb^{-1}$ that contains $772 \times 10^{6}$ $B\bar{B}$ events. The data were collected at the $\Upsilon(4S)$ 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 ($q^{2}$): $q^{2} \in (0.1, 4.0), (4.0, 8.12), (1.0, 6.0)$, $(10.2, 12.8)$ and ($>14.18) GeV^{2}/c^{4}$, along with the whole $q^2$ region. The $R_{K}$ value for $q^{2} \in (1.0, 6.0) GeV^{2}/c^{4}$ is $1.03^{+0.28}_{-0.24} \pm 0.01$. 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 $C\!P$-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 $q^{2}\in(1.0,6.0) GeV^{2}/c^{4}$ bin in the mode with muon final states. The measured differential branching fractions, ${d\cal B}/{dq^{2}}$, 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 $B \rightarrow K\mu^{\pm}e^{\mp}$ decays and set $90\%$ confidence-level upper limits on the branching fraction in the range of $10^{-8}$ for $B^{+} \rightarrow K^{+}\mu^{\pm}e^{\mp}$, and $B^{0} \rightarrow K^{0}\mu^{\pm}e^{\mp}$ modes., Comment: 18 pages, 7 figures

Published
2021

2. Test of lepton flavor universality in $B \to K \ell^{+}\ell^{-}$ decays

Author

Abdesselam, A., Adachi, I., Adamczyk, K., Ahn, J. K., Aihara, H., Al Said, S., Arinstein, K., Arita, Y., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Aziz, T., Babu, V., Badhrees, I., Bahinipati, S., Bakich, A. M., Ban, Y., Bansal, V., Barberio, E., Barrett, M., Bartel, W., Behera, P., Beleño, C., Belous, K., Bennett, J., Berger, M., Bernlochner, F., Besson, D., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bloomfield, T., Bobrov, A., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Braun, N., Breibeck, F., Browder, T. E., Campajola, M., Cao, L., Caria, G., Červenkov, D., Chang, M.-C., Chang, P., Chao, Y., Cheaib, R., Chekelian, V., Chen, A., Chen, K.-F., Chen, Y., Cheon, B. G., Chilikin, K., Chistov, R., Cho, H. E., Cho, K., Chobanova, V., Choi, S.-K., Choi, Y., Choudhury, S., Cinabro, D., Crnkovic, J., Cunliffe, S., Czank, T., Danilov, M., Dash, N., De Nardo, G., Di Carlo, S., Di Capua, F., Dingfelder, J., Doležal, Z., Dong, T. V., Dossett, D., Drásal, Z., Drutskoy, A., Dubey, S., Dutta, D., Eidelman, S., Epifanov, D., Fast, J. E., Feindt, M., Ferber, T., Frey, A., Frost, O., Fulsom, B. G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Gemmler, J., Getzkow, D., Giordano, F., Giri, A., Goldenzweig, P., Golob, B., Greenwald, D., Grosse Perdekamp, M., Grygier, J., Grzymkowska, O., Guan, Y., Guido, E., Guo, H., Haba, J., Hamer, P., Hara, K., Hara, T., Hartbrich, O., Hasegawa, Y., Hasenbusch, J., Hayasaka, K., Hayashii, H., He, X. H., Heck, M., Hedges, M. T., Heffernan, D., Heider, M., Heller, A., Higuchi, T., Hirose, S., Hoshi, Y., Hoshina, K., Hou, W.-S., Hsiung, Y. B., Hsu, C.-L., Huang, K., Huschle, M., Igarashi, Y., Iijima, T., Imamura, M., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Iwata, S., Jacobs, W. W., Jaegle, I., Jang, E.-J., Jeon, H. B., Jia, S., Jin, Y., Joffe, D., Jones, M., Joo, C. W., Joo, K. K., Julius, T., Kahn, J., Kakuno, H., Kaliyar, A. B., Kang, J. H., Kang, K. H., Kapusta, P., Karyan, G., Kataoka, S. U., Kato, Y., Katrenko, P., Kawai, H., Kawasaki, T., Keck, T., Kichimi, H., Kiesling, C., Kim, B. H., Kim, C. H., Kim, D. Y., Kim, H. J., Kim, H.-J., Kim, J. B., Kim, K. T., Kim, S. H., Kim, S. K., Kim, Y. J., Kimmel, T., Kindo, H., Kinoshita, K., Kleinwort, C., Klucar, J., Kobayashi, N., Kodyš, P., Koga, Y., Konno, T., Korpar, S., Kotchetkov, D., Kouzes, R. T., Križan, P., Kroeger, R., Krohn, J.-F., Krokovny, P., Kronenbitter, B., Kuhr, T., Kulasiri, R., Kumar, R., Kumita, T., Kurihara, E., Kuroki, Y., Kuzmin, A., Kvasnička, P., Kwon, Y.-J., Lai, Y.-T., Lalwani, K., Lange, J. S., Lee, I. S., Lee, J. K., Lee, J. Y., Lee, S. C., Leitgab, M., Leitner, R., Levit, D., Lewis, P., Li, C. H., Li, H., Li, L. K., Li, Y., Li, Y. B., Li Gioi, L., Libby, J., Lieret, K., Limosani, A., Liptak, Z., Liu, C., Liu, Y., Liventsev, D., Loos, A., Louvot, R., Lu, P.-C., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., McNeil, J. T., Merola, M., Metzner, F., Miyabayashi, K., Miyachi, Y., Miyake, H., Miyata, H., Miyazaki, Y., Mizuk, R., Mohanty, G. B., Mohanty, S., Moon, H. K., Moon, T. J., Mori, T., Morii, T., Moser, H.-G., Mrvar, M., Müller, T., Muramatsu, N., Mussa, R., Nagasaka, Y., Nakahama, Y., Nakamura, I., Nakamura, K. R., Nakano, E., Nakano, T., Nakao, M., Nakayama, H., Nakazawa, H., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Neichi, K., Ng, C., Niebuhr, Carsten, Niiyama, M., Nisar, N. K., Nishida, S., Nishimura, K., Nitoh, O., Ogawa, A., Ogawa, K., Ogawa, S., Ohshima, T., Okuno, S., Olsen, S. L., Ono, H., Onuki, Y., Ostrowicz, W., Oswald, C., Ozaki, H., Pakhlov, P., Pakhlova, G., Pal, B., Pang, T., Panzenböck, E., Pardi, S., Park, C.-S., Park, C. W., Park, H., Park, K. S., Park, S.-H., Patra, S., Paul, S., Pavelkin, I., Pedlar, T. K., Peng, T., Pesántez, L., Pestotnik, R., Peters, M., Piilonen, L. E., Popov, V., Prasanth, K., Prencipe, E., Prim, M. T., Prothmann, K., Purohit, M. V., Rabusov, A., Rauch, J., Reisert, B., Resmi, P. K., Ribežl, E., Ritter, M., Rorie, J., Rostomyan, A., Rozanska, M., Russo, G., Sahoo, D., Sahoo, H., Sakai, Y., Salehi, M., Sandilya, S., Santel, D., Santelj, L., Sanuki, T., Sasaki, J., Sasao, N., Sato, Y., Savinov, V., Schlüter, T., Schneider, O., Schnell, G., Schram, M., Schueler, J., Schwanda, C., Schwartz, A. J., Schwenker, B., Seidl, R., Seino, Y., Semmler, D., Senyo, K., Seon, O., Seong, I. S., Sevior, M. E., Shang, L., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shibuya, H., Shinomiya, S., Shiu, J.-G., Shwartz, B., Sibidanov, A., Simon, F., Singh, J. B., Sinha, R., Smith, K., Sokolov, A., Soloviev, Y., Solovieva, E., Stanič, S., Starič, M., Steder, M., Stottler, Z., Strube, J. F., Stypula, J., Sugihara, S., Sugiyama, A., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Suzuki, K., Suzuki, S., Suzuki, S. Y., Takeichi, H., Takizawa, M., Tamponi, U., Tanaka, M., Tanaka, S., Tanida, K., Taniguchi, N., Tao, Y., Taylor, G. N., Tenchini, F., Teramoto, Y., Trabelsi, K., Tsuboyama, T., Uchida, M., Ueda, I., Uehara, S., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Ushiroda, Y., Usov, Y., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Vanhoefer, P., Varner, G., Varvell, K. E., Vervink, K., Vinokurova, A., Vorobyev, V., Vossen, A., Wagner, M. N., Waheed, E., Wang, B., Wang, C. H., Wang, M.-Z., Wang, P., Wang, X. L., Watanabe, M., Watanabe, Y., Watanuki, S., Wedd, R., Wehle, S., Widmann, E., Wiechczynski, J., Williams, K. M., Won, E., Yabsley, B. D., Yamada, S., Yamamoto, H., Yamashita, Y., Yang, S. B., Yashchenko, S., Ye, H., Yelton, J., Yin, J. H., Yook, Y., Yuan, C. Z., Yusa, Y., Zakharov, S., Zhang, C. C., Zhang, J., Zhang, L. M., Zhang, Z. P., Zhao, L., Zhilich, V., Zhukova, V., Zhulanov, V., Zivko, T., Zupanc, A., and Zwahlen, N.

Subjects
Upsilon(10570): electroproduction, B: pair production, B: semileptonic decay, dilepton: mass spectrum, branching ratio: ratio: measured, isospin: asymmetry, BELLE, electron positron: colliding beams, B: branching ratio: measured, electron positron: annihilation, +K+electron+positron%22">B --> K electron positron, mass dependence, +K+muon%2B+muon%22">B --> K muon+ muon, muon: pair production, electron: pair production, muon: final state, lepton: flavor: universality, KEK-B, statistical, experimental results
Abstract

We present measurements of the branching fractions for the decays $B\to K \mu^{+}\mu^{-}$ and $B\to K e^{+}e^{-}$, and their ratio ($R_{K}$), using a data sample of 711 $fb^{-1}$ that contains $772 \times 10^{6}$ $B\bar{B}$ events. The data were collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The ratio $R_{K}$ is measured in four bins of dilepton invariant-mass squared, $q^{2}$; the results are \begin{eqnarray*} R_{K} = \begin{cases} 0.95~ ^{+0.27}_{-0.24} \pm 0.06 & q^{2} \in (0.1,4.0)~\mathrm{\,GeV^2}c^4 \, , 0.81~ ^{+0.28}_{-0.23} \pm 0.05 & q^{2} \in (4.0,8.12)~\mathrm{\,GeV^2}c^4 \, , 0.98~ ^{+0.27}_{-0.23} \pm 0.06 & q^{2} \in (1.0,6.0)~\mathrm{\,GeV^2}c^4 \, , 1.11~ ^{+0.29}_{-0.26} \pm 0.07 & q^{2} > 14.18~\mathrm{\,GeV^2}c^4 \, . \end{cases} \end{eqnarray*} The first uncertainties listed are statistical, and the second uncertainties are systematic. The $R_{K}$ value in the whole $q^2$ range is found to be $1.06~ ^{+0.15}_{-0.14} \pm 0.07$. 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 2.7 standard deviations is found in the $q^{2}\in(1.0,6.0)~\mathrm{\,GeV^2}c^4 \,$ bin in the mode with muon final states. The measured branching fractions are $\cal B\rm{\it(B\to K \mu^{+}\mu^{-})}= (5.5 \pm0.5 \pm0.3) \times 10^{-7}$ and $\cal B\rm{\it(B\to K e^{+}e^{-})} = (5.1 \pm 0.5 \pm0.3) \times 10^{-7}$. These results are compatible with standard model expectations.

Published
2020
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3. Test of lepton flavor universality in $B \to K \ell^{+}\ell^{-}$ decays

Author

Abdesselam, A., Adachi, I., Aulchenko, V., Greenwald, D., Grosse Perdekamp, M., Grygier, J., Grzymkowska, O., Guan, Y., Guido, E., Guo, H., Haba, J., Hamer, P., Hara, K., Aushev, T., Hara, T., Hartbrich, O., Hasegawa, Y., Hasenbusch, J., Hayasaka, K., Hayashii, H., He, X. H., Heck, M., Hedges, M. T., Heffernan, D., Ayad, R., Heider, M., Heller, A., Higuchi, T., Hirose, S., Hoshi, Y., Hoshina, K., Hou, W.-S., Hsiung, Y. B., Hsu, C.-L., Huang, K., Aziz, T., Huschle, M., Igarashi, Y., Iijima, T., Imamura, M., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Babu, V., Iwata, S., Jacobs, W. W., Jaegle, I., Jang, E.-J., Jeon, H. B., Jia, S., Jin, Y., Joffe, D., Jones, M., Joo, C. W., Badhrees, I., Joo, K. K., Julius, T., Kahn, J., Kakuno, H., Kaliyar, A. B., Kang, J. H., Kang, K. H., Kapusta, P., Karyan, G., Kataoka, S. U., Bahinipati, S., Kato, Y., Katrenko, P., Kawai, H., Kawasaki, T., Keck, T., Kichimi, H., Kiesling, C., Kim, B. H., Kim, C. H., Kim, D. Y., Bakich, A. M., Kim, H. J., Kim, H.-J., Kim, J. B., Kim, K. T., Kim, S. H., Kim, S. K., Kim, Y. J., Kimmel, T., Kindo, H., Kinoshita, K., Ban, Y., Kleinwort, C., Klucar, J., Kobayashi, N., Kodyš, P., Koga, Y., Konno, T., Korpar, S., Kotchetkov, D., Kouzes, R. T., Križan, P., Bansal, V., Kroeger, R., Krohn, J.-F., Krokovny, P., Kronenbitter, B., Kuhr, T., Kulasiri, R., Kumar, R., Kumita, T., Kurihara, E., Kuroki, Y., Adamczyk, K., Barberio, E., Kuzmin, A., Kvasnička, P., Kwon, Y.-J., Lai, Y.-T., Lalwani, K., Lange, J. S., Lee, I. S., Lee, J. K., Lee, J. Y., Lee, S. C., Barrett, M., Leitgab, M., Leitner, R., Levit, D., Lewis, P., Li, C. H., Li, H., Li, L. K., Li, Y., Li, Y. B., Li Gioi, L., Bartel, W., Libby, J., Lieret, K., Limosani, A., Liptak, Z., Liu, C., Liu, Y., Liventsev, D., Loos, A., Louvot, R., Lu, P.-C., Behera, P., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., McNeil, J. T., Merola, M., Metzner, F., Miyabayashi, K., Beleño, C., Miyachi, Y., Miyake, H., Miyata, H., Miyazaki, Y., Mizuk, R., Mohanty, G. B., Mohanty, S., Moon, H. K., Moon, T. J., Mori, T., Belous, K., Morii, T., Moser, H.-G., Mrvar, M., Müller, T., Muramatsu, N., Mussa, R., Nagasaka, Y., Nakahama, Y., Nakamura, I., Nakamura, K. R., Bennett, J., Nakano, E., Nakano, T., Nakao, M., Nakayama, H., Nakazawa, H., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Neichi, K., Berger, M., Ng, C., Niebuhr, Carsten, Niiyama, M., Nisar, N. K., Nishida, S., Nishimura, K., Nitoh, O., Ogawa, A., Ogawa, K., Ogawa, S., Bernlochner, F., Ohshima, T., Okuno, S., Olsen, S. L., Ono, H., Onuki, Y., Ostrowicz, W., Oswald, C., Ozaki, H., Pakhlov, P., Pakhlova, G., Besson, D., Pal, B., Pang, T., Panzenböck, E., Pardi, S., Park, C.-S., Park, C. W., Park, H., Park, K. S., Park, S.-H., Patra, S., Ahn, J. K., Bhardwaj, V., Paul, S., Pavelkin, I., Pedlar, T. K., Peng, T., Pesántez, L., Pestotnik, R., Peters, M., Piilonen, L. E., Popov, V., Prasanth, K., Bhuyan, B., Prencipe, E., Prim, M. T., Prothmann, K., Purohit, M. V., Rabusov, A., Rauch, J., Reisert, B., Resmi, P. K., Ribežl, E., Ritter, M., Bilka, T., Rorie, J., Rostomyan, A., Rozanska, M., Russo, G., Sahoo, D., Sahoo, H., Sakai, Y., Salehi, M., Sandilya, S., Santel, D., Biswal, J., Santelj, L., Sanuki, T., Sasaki, J., Sasao, N., Sato, Y., Savinov, V., Schlüter, T., Schneider, O., Schnell, G., Schram, M., Bloomfield, T., Schueler, J., Schwanda, C., Schwartz, A. J., Schwenker, B., Seidl, R., Seino, Y., Semmler, D., Senyo, K., Seon, O., Seong, I. S., Bobrov, A., Sevior, M. E., Shang, L., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shibuya, H., Shinomiya, S., Shiu, J.-G., Shwartz, B., Bondar, A., Sibidanov, A., Simon, F., Singh, J. B., Sinha, R., Smith, K., Sokolov, A., Soloviev, Y., Solovieva, E., Stanič, S., Starič, M., Bonvicini, G., Steder, M., Stottler, Z., Strube, J. F., Stypula, J., Sugihara, S., Sugiyama, A., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Bozek, A., Suzuki, K., Suzuki, S., Suzuki, S. Y., Takeichi, H., Takizawa, M., Tamponi, U., Tanaka, M., Tanaka, S., Tanida, K., Bračko, M., Taniguchi, N., Tao, Y., Taylor, G. N., Tenchini, F., Teramoto, Y., Trabelsi, K., Tsuboyama, T., Uchida, M., Ueda, I., Uehara, S., Aihara, H., Braun, N., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Ushiroda, Y., Usov, Y., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Vanhoefer, P., Breibeck, F., Varner, G., Varvell, K. E., Vervink, K., Vinokurova, A., Vorobyev, V., Vossen, A., Wagner, M. N., Waheed, E., Wang, B., Wang, C. H., Browder, T. E., Wang, M.-Z., Wang, P., Wang, X. L., Watanabe, M., Watanabe, Y., Watanuki, S., Wedd, R., Wehle, S., Widmann, E., Wiechczynski, J., Campajola, M., Williams, K. M., Won, E., Yabsley, B. D., Yamada, S., Yamamoto, H., Yamashita, Y., Yang, S. B., Yashchenko, S., Ye, H., Yelton, J., Cao, L., Yin, J. H., Yook, Y., Yuan, C. Z., Yusa, Y., Zakharov, S., Zhang, C. C., Zhang, J., Zhang, L. M., Zhang, Z. P., Zhao, L., Caria, G., Zhilich, V., Zhukova, V., Zhulanov, V., Zivko, T., Zupanc, A., Zwahlen, N., Belle Collaboration, Červenkov, D., Chang, M.-C., Chang, P., Chao, Y., Al Said, S., Cheaib, R., Chekelian, V., Chen, A., Chen, K.-F., Chen, Y., Cheon, B. G., Chilikin, K., Chistov, R., Cho, H. E., Cho, K., Arinstein, K., Chobanova, V., Choi, S.-K., Choi, Y., Choudhury, S., Cinabro, D., Crnkovic, J., Cunliffe, S., Czank, T., Danilov, M., Dash, N., Arita, Y., De Nardo, G., Di Carlo, S., Di Capua, F., Dingfelder, J., Doležal, Z., Dong, T. V., Dossett, D., Drásal, Z., Drutskoy, A., Dubey, S., Asner, D. M., Dutta, D., Eidelman, S., Epifanov, D., Fast, J. E., Feindt, M., Ferber, T., Frey, A., Frost, O., Fulsom, B. G., Garg, R., Atmacan, H., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Gemmler, J., Getzkow, D., Giordano, F., Giri, A., Goldenzweig, P., Golob, B., Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Belle

Subjects
Upsilon(10570): electroproduction, dilepton: mass spectrum, B: semileptonic decay, isospin: asymmetry, BELLE, annihilation [electron positron], B: branching ratio: measured, electron positron: annihilation, mass spectrum [dilepton], branching ratio: measured [B], electron: pair production, KEK-B, lepton: flavor: universality, +K+electron+positron%22">B --> K electron positron, +K+muon%2B+muon%22">B --> K muon+ muon, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], pair production [muon], pair production [electron], B: pair production, branching ratio: ratio: measured, electron positron: colliding beams, flavor: universality [lepton], mass dependence, pair production [B], muon: pair production, muon: final state, final state [muon], electroproduction [Upsilon(10570)], colliding beams [electron positron], semileptonic decay [B], ratio: measured [branching ratio], asymmetry [isospin], statistical, experimental results
Abstract

We present measurements of the branching fractions for the decays $B\to K \mu^{+}\mu^{-}$ and $B\to K e^{+}e^{-}$, and their ratio ($R_{K}$), using a data sample of 711 $fb^{-1}$ that contains $772 \times 10^{6}$ $B\bar{B}$ events. The data were collected at the $\Upsilon(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}e^{-}$ collider. The ratio $R_{K}$ is measured in four bins of dilepton invariant-mass squared, $q^{2}$; the results are \begin{eqnarray*} R_{K} = \begin{cases} 0.95~ ^{+0.27}_{-0.24} \pm 0.06 & q^{2} \in (0.1,4.0)~\mathrm{\,GeV^2}c^4 \, , 0.81~ ^{+0.28}_{-0.23} \pm 0.05 & q^{2} \in (4.0,8.12)~\mathrm{\,GeV^2}c^4 \, , 0.98~ ^{+0.27}_{-0.23} \pm 0.06 & q^{2} \in (1.0,6.0)~\mathrm{\,GeV^2}c^4 \, , 1.11~ ^{+0.29}_{-0.26} \pm 0.07 & q^{2} > 14.18~\mathrm{\,GeV^2}c^4 \, . \end{cases} \end{eqnarray*} The first uncertainties listed are statistical, and the second uncertainties are systematic. The $R_{K}$ value in the whole $q^2$ range is found to be $1.06~ ^{+0.15}_{-0.14} \pm 0.07$. 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 2.7 standard deviations is found in the $q^{2}\in(1.0,6.0)~\mathrm{\,GeV^2}c^4 \,$ bin in the mode with muon final states. The measured branching fractions are $\cal B\rm{\it(B\to K \mu^{+}\mu^{-})}= (5.5 \pm0.5 \pm0.3) \times 10^{-7}$ and $\cal B\rm{\it(B\to K e^{+}e^{-})} = (5.1 \pm 0.5 \pm0.3) \times 10^{-7}$. These results are compatible with standard model expectations.

Published
2019
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4. Measurements of isospin asymmetry and difference of direct $CP$ asymmetries in inclusive $B \to X_s \gamma$ decays

Author

Watanuki, S., Ishikawa, A., Bakich, A. M., Mohanty, G. B., Mori, T., Nakao, M., Nanut, T., Nath, K. J., Niiyama, M., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Bansal, V., Okuno, S., Ono, H., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, H., Paul, S., Pedlar, T. K., Pestotnik, R., Behera, P., Piilonen, L. E., Prencipe, E., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Sandilya, S., Santelj, L., Savinov, V., Schneider, O., Beleño, C., Schnell, G., Schueler, J., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Seon, O., Shebalin, V., Shibata, T.-A., Shiu, J.-G., Berger, M., Shwartz, B., Sokolov, A., Solovieva, E., Stanič, S., Starič, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Taniguchi, N., Bhardwaj, V., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Varvell, K. E., Bhuyan, B., Vossen, A., Wang, B., Wang, C. H., Wang, M.-Z., Wang, P., Watanabe, M., Widmann, E., Won, E., Ye, H., Yin, J. H., Bilka, T., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., Zupanc, A., Belle Collaboration, Biswal, J., Bobrov, A., Adachi, I., Bonvicini, G., Bozek, A., Brač, M., Browder, T. E., Cao, L., Červenkov, D., Chang, P., Cheon, B. G., Chilikin, K., Cho, K., Aihara, H., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Di Carlo, S., Dingfelder, J., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Al Said, S., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guan, Y., Asner, D. M., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hou, W.-S., Iijima, T., Inami, K., Inguglia, G., Itoh, R., Iwasaki, M., Aushev, T., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jeon, H. B., Jia, S., Jin, Y., Joo, K. K., Julius, T., Karyan, G., Kawasaki, T., Ayad, R., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križ, P., Kroeger, R., Babu, V., Krokovny, P., Kuhr, T., Kumar, R., Kuzmin, A., Kwon, Y.-J., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Badhrees, I., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Laboratoire de l'Accélérateur Linéaire (LAL), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Belle, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Upsilon(10570): electroproduction, isospin: asymmetry, BELLE, B: radiative decay, annihilation [electron positron], S042A12, electron positron: annihilation, S049A06, CP [asymmetry], 10.58 GeV-cms, violation [CP], High Energy Physics - Experiment, KEK-B, CP: violation, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Particle Physics Experiments, ddc:530, photon: resolved, radiative decay [B], Seoul 2018/07/04 [talk], B: pair production, talk: Seoul 2018/07/04, resolved [photon], electron positron: colliding beams, S049CP2, S041A11, pair production [B], asymmetry: CP, High Energy Physics - Phenomenology, Upsilon(10570), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], electroproduction [Upsilon(10570)], colliding beams [electron positron], S049IA1, branching ratio, asymmetry [isospin], S049DA1, experimental results
Abstract

We report measurements of isospin asymmetry $\Delta_{0-}$ and difference of direct $CP$ asymmetries $\Delta A_{CP}$ between charged and neutral $B \to X_s \gamma$ decays. This analysis is based on the data sample containing $772 \times 10^6 B\bar{B}$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $e^+ e^-$ collider. Using a sum-of-exclusive technique with invariant $X_s$ mass up to 2.8~GeV/$c^2$, we obtain $\Delta_{0-} = \bigl[-0.48 \pm 1.49 {\rm (stat.)} \pm 0.97 {\rm (syst.)} \pm 1.15 {(f_{+-}/f_{00})}\bigr]$\% and $\Delta A_{CP} = \bigl[+3.69 \pm 2.65 {\rm (stat.)} \pm 0.76{\rm (syst.)}\bigr]$\%, where the last uncertainty for $\Delta_{0-}$ is due to the uncertainty on the production ratio of $B^+B^-$ to $B^0\bar{B}^0$ in $\Upsilon(4S)$ decays. The measured value of $\Delta_{0-}$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $B \to X_s \gamma$, and improve the branching fraction prediction. The result for $\Delta A_{CP}$ is consistent with the prediction of the SM. We also measure the direct $CP$ asymmetries for charged and neutral $B \to X_s \gamma$ decays. All the measurements are the most precise to date., Comment: 20 pages, 10 figures, submitted to PRD

Published
2019
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5. Measurements of isospin asymmetry and difference of direct $CP$ asymmetries in inclusive $B \to X_s \gamma$ decays

Author

Watanuki, S., Ishikawa, A., Adachi, I., Aihara, H., Al Said, S., Asner, D. M., Aushev, T., Ayad, R., Babu, V., Badhrees, I., Bakich, A. M., Bansal, V., Behera, P., Beleño, C., Berger, M., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bobrov, A., Bonvicini, G., Bozek, A., Brač, M., Browder, T. E., Cao, L., Červenkov, D., Chang, P., Cheon, B. G., Chilikin, K., Cho, K., Choi, Y., Choudhury, S., Cinabro, D., Cunliffe, S., Di Carlo, S., Dingfelder, J., Dong, T. V., Eidelman, S., Epifanov, D., Fast, J. E., Ferber, T., Frey, A., Fulsom, B. G., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Giri, A., Goldenzweig, P., Guan, Y., Guido, E., Haba, J., Hayasaka, K., Hayashii, H., Hou, W.-S., Iijima, T., Inami, K., Inguglia, G., Itoh, R., Iwasaki, M., Iwasaki, Y., Jacobs, W. W., Jaegle, I., Jeon, H. B., Jia, S., Jin, Y., Joo, K. K., Julius, T., Karyan, G., Kawasaki, T., Kiesling, C., Kim, D. Y., Kim, J. B., Kim, S. H., Kinoshita, K., Kodyš, P., Korpar, S., Kotchetkov, D., Križ, P., Kroeger, R., Krokovny, P., Kuhr, T., Kumar, R., Kuzmin, A., Kwon, Y.-J., Lee, I. S., Lee, S. C., Li, L. K., Li, Y. B., Li Gioi, L., Libby, J., Liventsev, D., Lubej, M., Luo, T., Masuda, M., Matsuda, T., Merola, M., Miyabayashi, K., Miyata, H., Mizuk, R., Mohanty, G. B., Mori, T., Nakao, M., Nanut, T., Nath, K. J., Niiyama, M., Nishida, S., Nishimura, K., Ogawa, K., Ogawa, S., Okuno, S., Ono, H., Ostrowicz, W., Pakhlov, P., Pakhlova, G., Pal, B., Park, H., Paul, S., Pedlar, T. K., Pestotnik, R., Piilonen, L. E., Prencipe, E., Ritter, M., Rostomyan, A., Russo, G., Sakai, Y., Sandilya, S., Santelj, L., Savinov, V., Schneider, O., Schnell, G., Schueler, J., Schwanda, C., Schwartz, A. J., Seino, Y., Senyo, K., Seon, O., Shebalin, V., Shibata, T.-A., Shiu, J.-G., Shwartz, B., Sokolov, A., Solovieva, E., Stanič, S., Starič, M., Sumiyoshi, T., Sutcliffe, W., Takizawa, M., Tanida, K., Taniguchi, N., Tenchini, F., Uchida, M., Uglov, T., Unno, Y., Uno, S., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Varner, G., Varvell, K. E., Vossen, A., Wang, B., Wang, C. H., Wang, M.-Z., Wang, P., Watanabe, M., Widmann, E., Won, E., Ye, H., Yin, J. H., Yusa, Y., Zakharov, S., Zhang, Z. P., Zhilich, V., Zhukova, V., Zhulanov, V., and Zupanc, A.

Subjects
Upsilon(10570): electroproduction, B: pair production, talk: Seoul 2018/07/04, isospin: asymmetry, B: radiative decay, BELLE, electron positron: colliding beams, electron positron: annihilation, 10.58 GeV-cms, asymmetry: CP, Upsilon(10570), KEK-B, CP: violation, branching ratio, photon: resolved, experimental results
Abstract

Seminar, We report measurements of isospin asymmetry $\Delta_{0-}$ and difference of direct $CP$ asymmetries $\Delta A_{CP}$ between charged and neutral $B \to X_s \gamma$ decays. This analysis is based on the data sample containing $772 \times 10^6 B\bar{B}$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric $e^+ e^-$ collider. Using a sum-of-exclusive technique with invariant $X_s$ mass up to 2.8~GeV/$c^2$, we obtain $\Delta_{0-} = \bigl[-0.48 \pm 1.49 {\rm (stat.)} \pm 0.97 {\rm (syst.)} \pm 1.15 {(f_{+-}/f_{00})}\bigr]$\% and $\Delta A_{CP} = \bigl[+3.69 \pm 2.65 {\rm (stat.)} \pm 0.76{\rm (syst.)}\bigr]$\%, where the last uncertainty for $\Delta_{0-}$ is due to the uncertainty on the production ratio of $B^+B^-$ to $B^0\bar{B}^0$ in $\Upsilon(4S)$ decays. The measured value of $\Delta_{0-}$ is consistent with zero, allowing us to constrain the resolved photon contribution in the $B \to X_s \gamma$, and improve the branching fraction prediction. The result for $\Delta A_{CP}$ is consistent with the prediction of the SM. We also measure the direct $CP$ asymmetries for charged and neutral $B \to X_s \gamma$ decays. All the measurements are the most precise to date.

Published
2018
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6. $\Lambda\Lambda$ pairing in multi-strange hypernuclei

Author

Güven, H., Bozkurt, K., Khan, E., Margueron, J., Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay ( IPNO ), Université Paris-Sud - Paris 11 ( UP11 ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Institut de Physique Nucléaire de Lyon ( IPNL ), Université Claude Bernard Lyon 1 ( UCBL ), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Hartree-Fock approximation, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], isospin: asymmetry, quenching, angular momentum, helium: hypernucleus, three-body problem, mean field approximation, hyperon hyperon: interaction, structure, hypernucleus: ground state, Nuclear Experiment, numerical calculations, energy: condensation, [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th]
Abstract

Multi-strange Ca, Sn and Pb hypernuclei with $\Lambda\Lambda$ pairing interaction are investigated within the Hartree-Fock-Bogoliubov approach. The unknown $\Lambda\Lambda$ pairing strength is calibrated to match with the maximal value for the prediction of the $\Lambda$ pairing gap in uniform matter for densities and isospin asymmetries equivalent to those existing in multi-$\Lambda$ hypernuclei. In this way, we provide an upper bound for the prediction of the $\Lambda$ pairing gap and its effects in hypernuclei. The condensation energy is predicted to be about 3~MeV as a maximum value, yielding small corrections on density distributions and shell structure. In addition, conditions on both Fermi energies and orbital angular momenta are expected to quench the nucleon-$\Lambda$ pairing for most of hypernuclei., Comment: 10 pages, 7 figures

Published
2018

7. Isospin asymmetry of quark distributions and implications for single top-quark production at the LHC

Author

Alekhin, S., Blümlein, J., Moch, S., and Plačakytė, R.

Subjects
p p: scattering, small-x, top: single production, isospin: asymmetry, parton: distribution function, lepton: asymmetry, W: pair production, CERN LHC Coll, statistical analysis, lepton: production, anti-p p: scattering, Z0: pair production, Batavia TEVATRON Coll
Abstract

Physical review / D covering particles, fields, gravitation, and cosmology 94(11), 114038(2016). doi:10.1103/PhysRevD.94.114038, We present an improved determination of the up- and down-quark distributions in the proton using recent data on charged lepton asymmetries from W± gauge-boson production at the LHC and Tevatron. The analysis is performed in the framework of a global fit of parton distribution functions. The fit results are consistent with a nonzero isospin asymmetry of the sea, x($\bar{d}-\bar{u}$), at small values of Bjorken x∼10$^{-4}$ indicating a delayed onset of the Regge asymptotics of a vanishing ($\bar{d}-\bar{u}$)-asymmetry at small x. We compare with up- and down-quark distributions available in the literature and provide accurate predictions for the production of single top-quarks at the LHC, a process which can serve as a standard candle for the light quark flavor content of the proton., Published by Inst., Woodbury, NY

Published
2016
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8. Equations of state for supernovae and compact stars

Author

Matthias Hempel, Thomas Klähn, Stefan Typel, Micaela Oertel, Laboratoire Univers et Théories ( LUTH ), Institut national des sciences de l'Univers ( INSU - CNRS ) -Observatoire de Paris-Université Paris Diderot - Paris 7 ( UPD7 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7), PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7)-Observatoire de Paris, and PSL Research University (PSL)-PSL Research University (PSL)-Institut national des sciences de l'Univers (INSU - CNRS)

Subjects
electron, star: compact, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], matter: interaction, baryon number: density, [ PHYS.ASTR ] Physics [physics]/Astrophysics [astro-ph], isospin: asymmetry, General Physics and Astronomy, Collapse (topology), FOS: Physical sciences, Astrophysics::Cosmology and Extragalactic Astrophysics, Astrophysics, Compact star, hyperon, 01 natural sciences, 7. Clean energy, Nuclear physics, quark, Nuclear Theory (nucl-th), 0103 physical sciences, supernova, Nuclear Experiment, 010303 astronomy & astrophysics, Astrophysics::Galaxy Astrophysics, equation of state, [ PHYS.NUCL ] Physics [physics]/Nuclear Theory [nucl-th], Solar and Stellar Astrophysics (astro-ph.SR), Physics, High Energy Astrophysical Phenomena (astro-ph.HE), 010308 nuclear & particles physics, nucleus, nucleon, temperature, Nuclear matter, Supernova, Neutron star, Stars, Astrophysics - Solar and Stellar Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We review various theoretical approaches for the equation of state (EoS) of dense matter, relevant for the description of core-collapse supernovae, compact stars and compact star mergers. The emphasis is put on models that are applicable to all of these scenarios. Such EoS models have to cover large ranges in baryon number density, temperature and isospin asymmetry. The characteristics of matter change dramatically within these ranges, from a mixture of nucleons, nuclei, and electrons to uniform, strongly interacting matter containing nucleons, and possibly other particles such as hyperons or quarks. As the development of an EoS requires joint efforts from many directions we consider different theoretical approaches and discuss relevant experimental and observational constraints which provide insights for future research. Finally, results from applications of the discussed EoS models are summarized., Comment: 74 pages, 19 figures

Published
2016
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9. Building a realistic neutron star from holography

Author

Aaron Poole, Andreas Schmitt, Nicolas Kovensky, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Astrophysical Phenomena (astro-ph.HE), High Energy Physics - Theory, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], charge: electric, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], isospin: asymmetry, FOS: Physical sciences, tension, buildings, expansion 1/N: color, Nuclear Theory (nucl-th), baryon, High Energy Physics - Phenomenology, High Energy Physics - Phenomenology (hep-ph), High Energy Physics - Theory (hep-th), [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Sakai-Sugimoto model, holography, Astrophysics::Earth and Planetary Astrophysics, Astrophysics - High Energy Astrophysical Phenomena, neutron star, [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph]
Abstract

We employ the recently improved description of dense baryonic matter within the Witten-Sakai-Sugimoto model to construct neutron stars. In contrast to previous holographic approaches, the presence of an isospin asymmetry allows us to implement beta equilibrium and electric charge neutrality. As a consequence, we are able to model the crust of the star within the same formalism and compute the location of the crust-core transition dynamically. After showing that a simple pointlike approximation for the baryons fails to satisfy astrophysical constraints, we demonstrate that our improved description does account for neutron stars that meet the current experimental constraints for mass, radius, and tidal deformability. However, we also point out tensions in the parameter fit and large-$N_c$ artifacts and discuss how to potentially resolve them in the future., 19 pages, 12 figures; v2: small correction in Table I, reference added, accepted for publication in PRD; v3: typos in last line of p7 and equation (34b) corrected

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10. Isospin asymmetry in holographic baryonic matter

Author

Andreas Schmitt, Nicolas Kovensky, Institut de Physique Théorique - UMR CNRS 3681 (IPHT), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
High Energy Physics - Theory, Particle physics, star: compact, deconfinement, geometry, Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], media_common.quotation_subject, QC1-999, isospin: asymmetry, FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, Asymmetry, Nuclear Theory (nucl-th), High Energy Physics - Phenomenology (hep-ph), Pion, 0103 physical sciences, quantum chromodynamics, 010306 general physics, Nuclear Experiment, Ansatz, media_common, lattice, Physics, Quantum chromodynamics, 010308 nuclear & particles physics, [PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th], High Energy Physics::Phenomenology, Charge (physics), critical phenomena, Gauge (firearms), pi: condensation, Baryon, baryon, chiral, High Energy Physics - Phenomenology, High Energy Physics - Theory (hep-th), potential: chemical, Isospin, [PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph], Sakai-Sugimoto model, gauge field theory, holography
Abstract

We study baryonic matter with isospin asymmetry, including fully dynamically its interplay with pion condensation. To this end, we employ the holographic Witten-Sakai-Sugimoto model and the so-called homogeneous ansatz for the gauge fields in the bulk to describe baryonic matter. Within the confined geometry and restricting ourselves to the chiral limit, we map out the phase structure in the presence of baryon and isospin chemical potentials, showing that for sufficiently large chemical potentials condensed pions and isospin-asymmetric baryonic matter coexist. We also present first results of the same approach in the deconfined geometry and demonstrate that this case, albeit technically more involved, is better suited for comparisons with and predictions for real-world QCD. Our study lays the ground for future improved holographic studies aiming towards a realistic description of charge neutral, beta-equilibrated matter in compact stars, and also for more refined comparisons with lattice studies at nonzero isospin chemical potential., 53 pages, 8 figures, v2: minor improvements in the text, format adapted to SciPost Physics; v3: typos in Eqs.(20) and (30c) corrected

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11. Test of lepton flavor universality and search for lepton flavor violation in B → Kℓℓ decays

Author

Abdesselam, A., Adachi, I., Adamczyk, K., Ahn, J. K., Aihara, H., Al Said, S., Arinstein, K., Arita, Y., Asner, D. M., Atmacan, H., Aulchenko, V., Aushev, T., Ayad, R., Aziz, T., Babu, V., Badhrees, I., Bahinipati, S., Bakich, A. M., Ban, Y., Bansal, V., Barberio, E., Barrett, M., Bartel, W., Behera, P., Beleño, C., Belous, K., Bennett, J., Berger, M., Bernlochner, F., Besson, D., Bhardwaj, V., Bhuyan, B., Bilka, T., Biswal, J., Bloomfield, T., Bobrov, A., Bondar, A., Bonvicini, G., Bozek, A., Bračko, M., Braun, N., Breibeck, F., Browder, T. E., Campajola, M., Cao, L., Caria, G., Červenkov, D., Chang, M.-C., Chang, P., Chao, Y., Cheaib, R., Chekelian, V., Chen, A., Chen, K.-F., Chen, Y., Cheon, B. G., Chilikin, K., Chistov, R., Cho, H. E., Cho, K., Chobanova, V., Choi, S.-K., Choi, Y., Choudhury, S., Cinabro, D., Crnkovic, J., Cunliffe, S., Czank, T., Danilov, M., Dash, N., De Nardo, G., Di Carlo, S., Di Capua, F., Dingfelder, J., Doležal, Z., Dong, T. V., Dossett, D., Drásal, Z., Drutskoy, A., Dubey, S., Dutta, D., Eidelman, S., Epifanov, D., Fast, J. E., Feindt, M., Ferber, T., Frey, A., Frost, O., Fulsom, B. G., Garg, R., Gaur, V., Gabyshev, N., Garmash, A., Gelb, M., Gemmler, J., Getzkow, D., Giordano, F., Giri, A., Goldenzweig, P., Golob, B., Greenwald, D., Grosse Perdekamp, M., Grygier, J., Grzymkowska, O., Guan, Y., Guido, E., Guo, H., Haba, J., Hamer, P., Hara, K., Hara, T., Hartbrich, O., Hasegawa, Y., Hasenbusch, J., Hayasaka, K., Hayashii, H., He, X. H., Heck, M., Hedges, M. T., Heffernan, D., Heider, M., Heller, A., Higuchi, T., Hirose, S., Hoshi, Y., Hoshina, K., Hou, W.-S., Hsiung, Y. B., Hsu, C.-L., Huang, K., Huschle, M., Igarashi, Y., Iijima, T., Imamura, M., Inami, K., Inguglia, G., Ishikawa, A., Itoh, R., Iwasaki, M., Iwasaki, Y., Iwata, S., Jacobs, W. W., Jaegle, I., Jang, E.-J., Jeon, H. B., Jia, S., Jin, Y., Joffe, D., Jones, M., Joo, C. W., Joo, K. K., Julius, T., Kahn, J., Kakuno, H., Kaliyar, A. B., Kang, J. H., Kang, K. H., Kapusta, P., Karyan, G., Kataoka, S. U., Kato, Y., Katrenko, P., Kawai, H., Kawasaki, T., Keck, T., Kichimi, H., Kiesling, C., Kim, B. H., Kim, C. H., Kim, D. Y., Kim, H. J., Kim, H.-J., Kim, J. B., Kim, K. T., Kim, S. H., Kim, S. K., Kim, Y. J., Kimmel, T., Kindo, H., Kinoshita, K., Kleinwort, C., Klucar, J., Kobayashi, N., Kodyš, P., Koga, Y., Konno, T., Korpar, S., Kotchetkov, D., Kouzes, R. T., Križan, P., Kroeger, R., Krohn, J.-F., Krokovny, P., Kronenbitter, B., Kuhr, T., Kulasiri, R., Kumar, R., Kumita, T., Kurihara, E., Kuroki, Y., Kuzmin, A., Kvasnička, P., Kwon, Y.-J., Lai, Y.-T., Lalwani, K., Lange, J. S., Lee, I. S., Lee, J. K., Lee, J. Y., Lee, S. C., Leitgab, M., Leitner, R., Levit, D., Lewis, P., Li, C. H., Li, H., Li, L. K., Li, Y., Li, Y. B., Li Gioi, L., Libby, J., Lieret, K., Limosani, A., Liptak, Z., Liu, C., Liu, Y., Liventsev, D., Loos, A., Louvot, R., Lu, P.-C., Lubej, M., Luo, T., MacNaughton, J., Masuda, M., Matsuda, T., Matvienko, D., McNeil, J. T., Merola, M., Metzner, F., Miyabayashi, K., Miyachi, Y., Miyake, H., Miyata, H., Miyazaki, Y., Mizuk, R., Mohanty, G. B., Mohanty, S., Moon, H. K., Moon, T. J., Mori, T., Morii, T., Moser, H.-G., Mrvar, M., Müller, T., Muramatsu, N., Mussa, R., Nagasaka, Y., Nakahama, Y., Nakamura, I., Nakamura, K. R., Nakano, E., Nakano, T., Nakao, M., Nakayama, H., Nakazawa, H., Nanut, T., Nath, K. J., Natkaniec, Z., Nayak, M., Neichi, K., Ng, C., Niebuhr, Carsten, Niiyama, M., Nisar, N. K., Nishida, S., Nishimura, K., Nitoh, O., Ogawa, A., Ogawa, K., Ogawa, S., Ohshima, T., Okuno, S., Olsen, S. L., Ono, H., Onuki, Y., Ostrowicz, W., Oswald, C., Ozaki, H., Pakhlov, P., Pakhlova, G., Pal, B., Pang, T., Panzenböck, E., Pardi, S., Park, C.-S., Park, C. W., Park, H., Park, K. S., Park, S.-H., Patra, S., Paul, S., Pavelkin, I., Pedlar, T. K., Peng, T., Pesántez, L., Pestotnik, R., Peters, M., Piilonen, L. E., Popov, V., Prasanth, K., Prencipe, E., Prim, M. T., Prothmann, K., Purohit, M. V., Rabusov, A., Rauch, J., Reisert, B., Resmi, P. K., Ribežl, E., Ritter, M., Rorie, J., Rostomyan, A., Rozanska, M., Russo, G., Sahoo, D., Sahoo, H., Sakai, Y., Salehi, M., Santel, D., Sandilya, Saurabh, Santelj, L., Sanuki, T., Sasaki, J., Sasao, N., Sato, Y., Savinov, V., Schlüter, T., Schneider, O., Schnell, G., Schram, M., Schueler, J., Schwanda, C., Schwartz, A. J., Schwenker, B., Seidl, R., Seino, Y., Semmler, D., Senyo, K., Seon, O., Seong, I. S., Sevior, M. E., Shang, L., Shapkin, M., Shebalin, V., Shen, C. P., Shibata, T.-A., Shibuya, H., Shinomiya, S., Shiu, J.-G., Shwartz, B., Sibidanov, A., Simon, F., Singh, J. B., Sinha, R., Smith, K., Sokolov, A., Soloviev, Y., Solovieva, E., Stanič, S., Starič, M., Steder, M., Stottler, Z., Strube, J. F., Stypula, J., Sugihara, S., Sugiyama, A., Sumihama, M., Sumisawa, K., Sumiyoshi, T., Sutcliffe, W., Suzuki, K., Suzuki, S., Suzuki, S. Y., Takeichi, H., Takizawa, M., Tamponi, U., Tanaka, M., Tanaka, S., Tanida, K., Taniguchi, N., Tao, Y., Taylor, G. N., Tenchini, F., Teramoto, Y., Trabelsi, K., Tsuboyama, T., Uchida, M., Ueda, I., Uehara, S., Uglov, T., Unno, Y., Uno, S., Urquijo, P., Ushiroda, Y., Usov, Y., Vahsen, S. E., Van Hulse, C., Van Tonder, R., Vanhoefer, P., Varner, G., Varvell, K. E., Vervink, K., Vinokurova, A., Vorobyev, V., Vossen, A., Wagner, M. N., Waheed, E., Wang, B., Wang, C. H., Wang, M.-Z., Wang, P., Wang, X. L., Watanabe, M., Watanabe, Y., Watanuki, S., Wedd, R., Wehle, S., Widmann, E., Wiechczynski, J., Williams, K. M., Won, E., Yabsley, B. D., Yamada, S., Yamamoto, H., Yamashita, Y., Yang, S. B., Yashchenko, S., Ye, H., Yelton, J., Yin, J. H., Yook, Y., Yuan, C. Z., Yusa, Y., Zakharov, S., Zhang, C. C., Zhang, J., Zhang, L. M., Zhang, Z. P., Zhao, L., Zhilich, V., Zhukova, V., Zhulanov, V., Zivko, T., Zupanc, A., Zwahlen, N., and Collaboration, Belle

Subjects
FCNC Interaction, Upsilon(10570): electroproduction, B: semileptonic decay, dilepton: mass spectrum, isospin: asymmetry, Flavour Changing Neutral Currents, e+-e− Experiments, BELLE, B: branching ratio: measured, electron positron: annihilation, +K+electron+positron%22">B --> K electron positron, B physics, electron: pair production, Flavor physics, lepton: flavor: universality, KEK-B, B: pair production, branching ratio: ratio: measured, electron positron: colliding beams, mass dependence, 3. Good health, +K+muon%2B+muon%22">B --> K muon+ muon, muon: pair production, muon: final state, statistical, experimental results
Abstract

Journal of high energy physics 2021(3), 105 (1-19) (2021). doi:10.1007/JHEP03(2021)105, 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 × 106 BB¯¯¯¯ 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+0.28−0.24 ± 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., Published by SISSA, [Trieste]

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