학술논문

Angular analysis of $B \to K^* e^+ e^-$ in the low-$q^2$ region with new electron identification at Belle
Document Type
Working Paper
Author
Belle CollaborationFerlewicz, D.Urquijo, P.Adachi, I.Adamczyk, K.Aihara, H.Asner, D. M.Atmacan, H.Ayad, R.Babu, V.Banerjee, Sw.Behera, P.Belous, K.Bennett, J.Bessner, M.Bhardwaj, V.Bhuyan, B.Bilka, T.Biswas, D.Bodrov, D.Bračko, M.Branchini, P.Browder, T. E.Budano, A.Campajola, M.Cao, L.Červenkov, D.Chang, M. -C.Cheon, B. G.Chilikin, K.Cho, H. E.Cho, K.Choi, S. -K.Choi, Y.Choudhury, S.Das, S.Dash, N.de Marino, G.De Pietro, G.Dhamija, R.Di Capua, F.Dingfelder, J.Doležal, Z.Dong, T. V.Dubey, S.Ecker, P.Epifanov, D.Ferber, T.Fulsom, B. G.Gaur, V.Garmash, A.Giri, A.Goldenzweig, P.Graziani, E.Gu, T.Guan, Y.Gudkova, K.Hadjivasiliou, C.Hara, T.Hayasaka, K.Hayashii, H.Hazra, S.Hedges, M. T.Herrmann, D.Hou, W. -S.Hsu, C. -L.Iijima, T.Ishikawa, A.Itoh, R.Iwasaki, M.Jacobs, W. W.Jia, S.Jin, Y.Kaliyar, A. B.Kiesling, C.Kim, C. H.Kim, D. Y.Kim, K. -H.Kim, Y. -K.Kinoshita, K.Kodyš, P.Konno, T.Korobov, A.Korpar, S.Kou, E.Kovalenko, E.Križan, P.Krokovny, P.Kuhr, T.Kumar, R.Kumara, K.Kuzmin, A.Kwon, Y. -J.Lai, Y. -T.Lam, T.Lee, S. C.Levit, D.Lewis, P.Li, L. K.Li, Y. B.Gioi, L. LiLibby, J.Liventsev, D.Ma, Y.Matvienko, D.Meier, F.Merola, M.Metzner, F.Miyabayashi, K.Mizuk, R.Mohanty, G. B.Nakamura, I.Nakao, M.Natochii, A.Nayak, L.Nishida, S.Ogawa, S.Ono, H.Pardi, S.Park, J.Passeri, A.Patra, S.Paul, S.Pedlar, T. K.Pestotnik, R.Piilonen, L. E.Podobnik, T.Prencipe, E.Prim, M. T.Rout, N.Russo, G.Sandilya, S.Savinov, V.Schnell, G.Schwanda, C.Seino, Y.Senyo, K.Sevior, M. E.Shan, W.Sharma, C.Shiu, J. -G.Shwartz, B.Solovieva, E.Starič, M.Sumihama, M.Takizawa, M.Tamponi, U.Tanida, K.Tenchini, F.Uchida, M.Unno, Y.Uno, S.Ushiroda, Y.Vahsen, S. E.Varvell, K. E.Wang, E.Wang, M. -Z.Watanuki, S.Won, E.Yabsley, B. D.Yan, W.Yang, S. B.Yelton, J.Yin, J. H.Yuan, C. Z.Yuan, L.Yusa, Y.Zhang, Z. P.Zhilich, V.Zhukova, V.
Source
Subject
High Energy Physics - Experiment
Language
Abstract
We perform an angular analysis of the $B\to K^* e^+ e^-$ decay for the dielectron mass squared, $q^2$, range of $0.0008$ to $1.1200 ~\text{GeV}^2 /c^4$ using the full Belle data set in the $K^{*0} \to K^+ \pi^-$ and $K^{*+} \to K_S^0 \pi^+$ channels, incorporating new methods of electron identification to improve the statistical power of the data set. This analysis is sensitive to contributions from right-handed currents from physics beyond the Standard Model by constraining the Wilson coefficients $\mathcal{C}_7^{(\prime)}$. We perform a fit to the $B\to K^* e^+ e^-$ differential decay rate and measure the imaginary component of the transversality amplitude to be $A_T^{\rm Im} = -1.27 \pm 0.52 \pm 0.12$, and the $K^*$ transverse asymmetry to be $A_T^{(2)} = 0.52 \pm 0.53 \pm 0.11$. The resulting constraints on the value of $\mathcal{C}_7^{\prime}$ are consistent with the Standard Model within a $2\sigma$ confidence interval.
Comment: Submitted to PRD