Evidence for Isospin Violation and Measurement of CP Asymmetries in B→K*(892)γ

Horiguchi, T.; Ishikawa, A.; Yamamoto, H.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.; Bakich, A. M.; Bansal, V.; Behera, P.; Bhardwaj, V.; Bhuyan, B.; Biswal, J.; Bobrov, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Červenkov, D.; Chekelian, V.; Chen, A.; Cheon, B. G.; Chilikin, K.; Cho, K.; Choi, Y.; Cinabro, D.; Czank, T.; Dash, N.; Di Carlo, S.; Doležal, Z.; Drásal, Z.; Dutta, D.; Eidelman, S.; Epifanov, D.; Farhat, H.; Fast, J. E.; Ferber, T.; Fulsom, B. G.; Gaur, V.; Gabyshev, N.; Garmash, A.; Gelb, M.; Gillard, R.; Goldenzweig, P.; Golob, B.; Guan, Y.; Guido, E.; Haba, J.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hedges, M. T.; Higuchi, T.; Hirose, S.; Hou, W. -S.; Iijima, T.; Inami, K.; Inguglia, G.; Itoh, R.; Iwasaki, Y.; Jacobs, W. W.; Jaegle, I.; Jeon, H. B.; Jia, S.; Jin, Y.; Joffe, D.; Joo, K. K.; Julius, T.; Kang, K. H.; Kawasaki, T.; Kim, D. Y.; Kim, J. B.; Kim, K. T.; Kim, M. J.; Kim, S. H.; Kim, Y. J.; Kinoshita, K.; Kodyš, P.; Korpar, S.; Kotchetkov, D.; Križan, P.; Krokovny, P.; Kuhr, T.; Kulasiri, R.; Kumar, R.; Kumita, T.; Kuzmin, A.; Kwon, Y. -J.; Lange, J. S.; Li, C. H.; Li, L.; Li Gioi, L.; Libby, J.; Liventsev, D.; Lubej, M.; Luo, T.; Masuda, M.; Matsuda, T.; Matvienko, D.; Merola, M.; Miyabayashi, K.; Miyata, H.; Mizuk, R.; Mohanty, G. B.; Mohanty, S.; Moon, H. K.; Mori, T.; Mussa, R.; Nakano, E.; Nakao, M.; Nanut, T.; Nath, K. J.; Natkaniec, Z.; Nayak, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Okuno, S.; Ono, H.; Pakhlov, P.; Pakhlova, G.; Pal, B.; Pardi, S.; Park, C. -S.; Park, H.; Paul, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Prasanth, K.; Pulvermacher, C.; Rauch, J.; Rostomyan, A.; Sakai, Y.; Sandilya, S.; Santelj, L.; Savinov, V.; Schneider, O.; Schnell, G.; Schwanda, C.; Schwartz, A. J.; Seino, Y.; Senyo, K.; Seong, I. S.; Sevior, M. E.; Shebalin, V.; Shen, C. P.; Shibata, T. -A.; Shiu, J. -G.; Simon, F.; Sokolov, A.; Solovieva, E.; Starič, M.; Strube, J. F.; Sumisawa, K.; Sumiyoshi, T.; Takizawa, M.; Tamponi, U.; Tanida, K.; Tenchini, F.; Trabelsi, K.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Ushiroda, Y.; Usov, Y.; Van Hulse, C.; Varner, G.; Vinokurova, A.; Vorobyev, V.; Vossen, A.; Wang, C. H.; Wang, M. -Z.; Wang, P.; Watanabe, Y.; Watanuki, S.; Weber, T.; Widmann, E.; Won, E.; Yamashita, Y.; Ye, H.; Zhang, Z. P.; Zhilich, V.; Zhukova, V.; Zhulanov, V.; Zupanc, A.

doi:10.1103/PhysRevLett.119.191802

Title: Evidence for Isospin Violation and Measurement of $C P$ Asymmetries in $B \to K^{*} (892) γ$

Journal Article · Tue Nov 07 00:00:00 EST 2017 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.119.191802· OSTI ID:1430715

Horiguchi, T.; Ishikawa, A.; Yamamoto, H.; Adachi, I.; Aihara, H.; Al Said, S.; Asner, D. M.; Aulchenko, V.; Aushev, T.; Ayad, R.; Babu, V.; Badhrees, I.; Bakich, A. M.; Bansal, V.; Behera, P.; Bhardwaj, V.; Bhuyan, B.; Biswal, J.; Bobrov, A.; Bonvicini, G. more »

Here, we report the first evidence for isospin violation in B → K*γ and the first measurement of the difference of CP asymmetries between B+→K*+γ and B⁰ → K*⁰γ. This analysis is based on the data sample containing 772 × 10⁶$$B\overline{B}$$ pairs that was collected with the Belle detector at the KEKB energy-asymmetric e⁺e^- collider. We find evidence for the isospin violation with a significance of 3.1σ, Δ₀₊ = [+6.2 ± 1.5(stat) ± 0.6(syst) ± 1.2(f_+-/ f₀₀)]% , where the third uncertainty is due to the uncertainty on the fraction of B⁺B^- to B⁰B⁰ production in Υ(4S) decays. The measured value is consistent with predictions of the standard model. The result for the difference of CP asymmetries is ΔA_CP = [+2.4 ± 2.8(stat)± 0.5(syst)]% , consistent with zero. The measured branching fractions and CP asymmetries for charged and neutral B meson decays are the most precise to date. Finally, we also calculate the ratio of branching fractions of B⁰ → K*⁰γ to B$$0\atop{s}$$ → Φγ.

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Research Organization:: Virginia Polytechnic Inst. and State Univ. (Virginia Tech), Blacksburg, VA (United States); Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Contributing Organization:: Belle Collaboration

Grant/Contract Number:: SC0009973; AC05-76RL01830; LTT17020; 2011-0029457; 2012-0008143; 2014R1A2A2A01005286; 2014R1A2A2A01002734; 2015R1A2A2A01003280; 2015H1A2A1033649; 2016R1D1A1B01010135; 2016K1A3A7A09005603; 2016K1A3A7A09005604; 2016R1D1A1B02012900; 2016K1A3A7A09005606; NRF-2013K1A3A7A06056592

OSTI ID:: 1430715

Alternate ID(s):: OSTI ID: 1407827; OSTI ID: 1594350

Report Number(s):: PNNL-SA-127410; PRLTAO; TRN: US1802757

Journal Information:: Physical Review Letters, Vol. 119, Issue 19; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 18 works

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