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来自Belle的$B^{0} \to D^{*-} \ell^+ ν_\ell$的CKM基质元素PDMATHAAB的测量

Measurement of the CKM Matrix Element $|V_{cb}|$ from $B^{0} \to D^{*-} \ell^+ ν_\ell$ at Belle

E. Waheed, P. Urquijo, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, I. Badhrees, V. Bansal, P. Behera, C… 展开作者

E. Waheed, P. Urquijo, I. Adachi, K. Adamczyk, H. Aihara, S. Al Said, D. M. Asner, H. Atmacan, T. Aushev, R. Ayad, V. Babu, I. Badhrees, V. Bansal, P. Behera, C. Beleno, F. Bernlochner, B. Bhuyan, T. Bilka, J. Biswal, A. Bobrov, G. Bonvicini, A. Bozek, M. Bracko, T. E. Browder, M. Campajola, D. Cervenkov, P. Chang, V. Chekelian, A. Chen, B. G. Cheon, K. Chilikin, H. E. Cho, K. Cho, S. -K. Choi, Y. Choi, S. Choudhury, D. Cinabro, S. Cunliffe, S. Di Carlo, Z. Dolezal, T. V. Dong, D. Dossett, S. Eidelman, D. Epifanov, J. E. Fast, B. G. Fulsom, R. Garg, V. Gaur, A. Garmash, A. Giri, P. Goldenzweig, B. Golob, O. Grzymkowska, J. Haba, T. Hara, K. Hayasaka, H. Hayashii, M. T. Hedges, W. -S. Hou, C. -L. Hsu, T. Iijima, K. Inami, G. Inguglia, A. Ishikawa, M. Iwasaki, Y. Iwasaki, W. W. Jacobs, H. B. Jeon, S. Jia, Y. Jin, D. Joffe, K. K. Joo, J. Kahn, A. B. Kaliyar, G. Karyan, T. Kawasaki, C. H. Kim, D. Y. Kim, K. T. Kim, S. H. Kim, K. Kinoshita, P. Kodys, S. Korpar, D. Kotchetkov, P. Krizan, R. Kroeger, P. Krokovny, T. Kuhr, R. Kulasiri, A. Kuzmin, Y. -J. Kwon, J. S. Lange, J. Y. Lee, S. C. Lee, C. H. Li, L. K. Li, Y. B. Li, L. Li Gioi, J. Libby, K. Lieret, D. Liventsev, P. -C. Lu, T. Luo, J. MacNaughton, M. Masuda, D. Matvienko, M. Merola, F. Metzner, K. Miyabayashi, H. Miyata, R. Mizuk, G. B. Mohanty, T. Mori, R. Mussa, I. Nakamura, M. Nakao, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama, N. K. Nisar, S. Nishida, K. Nishimura, S. Ogawa, H. Ono, P. Pakhlov, G. Pakhlova, B. Pal, S. Pardi, H. Park, S. -H. Park, S. Paul, R. Pestotnik, L. E. Piilonen, V. Popov, E. Prencipe, M. Prim, 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, F. Simon, A. Sokolov, E. Solovieva, S. Stanic, M. Staric, Z. S. Stottler, J. F. Strube, T. Sumiyoshi, M. Takizawa, K. Tanida, F. Tenchini, K. Trabelsi, M. Uchida, T. Uglov, Y. Unno, S. Uno, Y. Usov, G. Varner, K. E. Varvell, A. Vinokurova, A. Vossen, C. H. Wang, M. -Z. Wang, P. Wang, E. Won, S. B. Yang, H. Ye, Y. Yusa, Z. P. Zhang, V. Zhilich, V. Zhukova

发表信息：
Phys. Rev. D 100, 052007 (2019)
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摘要：

我们提出了一种新的测量CKM矩阵元$|V_{cb}|$从$B^{0} \to D^{*-} \ell^+ ν_\ell$衰变，重建与完整的Belle数据集的$711 \, \rm fb^{-1}$积分光度。最初由Caprini-Lellouch-Neubert（CLN）和Boyd，Grinstein和Lebed（BGL）小组设想的两种形状因子参数化用于提取产物$\mathcal{F}(1)η_{\rm EW}|V_{cb}|$和衰变形状因子，其中$\mathcal{F}(1)$是归一化因子，$η_{\rm EW}$是小的电弱校正。在CLN参数化中，我们发现了$\mathcal{F}(1)η_{\rm EW}|V_{cb}| = (35.06 \pm 0.15 \pm 0.56) \times 10^{-3}$、$ρ^{2}=1.106 \pm 0.031 \pm 0.007$、$R_{1}(1)=1.229 \pm 0.028 \pm 0.009$、$R_{2}(1)=0.852 \pm 0.021 \pm 0.006$。对于BGL参数化，我们获得了$\mathcal{F}(1)η_{\rm EW}|V_{cb}|= (34.93 \pm 0.23 \pm 0.59)\times 10^{-3}$，当对$\mathcal{F}(1)η_{\rm EW}$进行校正时，它与世界平均值一致。$B^{0} \to D^{*-} \ell^+ ν_\ell$的支化分数测定为$\mathcal{B}(B^{0}\rightarrow D^{*-}\ell^{+}ν_{\ell}) = (4.90 \pm 0.02 \pm 0.16)\%$。我们还提出了半轻子$B$衰变中轻子味普适性破坏的一个新的检验，$\frac{{\cal B }(B^0 \to D^{*-} e^+ ν)}{{\cal B }(B^0 \to D^{*-} μ^+ ν)} = 1.01 \pm 0.01 \pm 0.03~$ .这些误差分别对应于统计不确定度和系统不确定度。这是迄今为止对$\mathcal{F}(1)η_{\rm EW}|V_{cb}|$和形状因子的最精确测量，也是在实验测量中对BGL形状因子参数化的第一次实验研究。

英文摘要：

We present a new measurement of the CKM matrix element $|V_{cb}|$ from $B^{0} \to D^{*-} \ell^+ ν_\ell$ decays, reconstructed with the full Belle data set of $711 \, \rm fb^{-1}$ integrated luminosity. Two form factor parameterizations, originally conceived by the Caprini-Lellouch-Neubert (CLN) and the Boyd, Grinstein and Lebed (BGL) groups, are used to extract the product $\mathcal{F}(1)η_{\rm EW}|V_{cb}|$ and the decay form factors, where $\mathcal{F}(1)$ is the normalization factor and $η_{\rm EW}$ is a small electroweak correction. In the CLN parameterization we find $\mathcal{F}(1)η_{\rm EW}|V_{cb}| = (35.06 \pm 0.15 \pm 0.56) \times 10^{-3}$, $ρ^{2}=1.106 \pm 0.031 \pm 0.007$, $R_{1}(1)=1.229 \pm 0.028 \pm 0.009$, $R_{2}(1)=0.852 \pm 0.021 \pm 0.006$. For the BGL parameterization we obtain $\mathcal{F}(1)η_{\rm EW}|V_{cb}|= (34.93 \pm 0.23 \pm 0.59)\times 10^{-3}$, which is consistent with the World Average when correcting for $\mathcal{F}(1)η_{\rm EW}$. The branching fraction of $B^{0} \to D^{*-} \ell^+ ν_\ell$ is measured to be $\mathcal{B}(B^{0}\rightarrow D^{*-}\ell^{+}ν_{\ell}) = (4.90 \pm 0.02 \pm 0.16)\%$. We also present a new test of lepton flavor universality violation in semileptonic $B$ decays, $\frac{{\cal B }(B^0 \to D^{*-} e^+ ν)}{{\cal B }(B^0 \to D^{*-} μ^+ ν)} = 1.01 \pm 0.01 \pm 0.03~$. The errors correspond to the statistical and systematic uncertainties respectively. This is the most precise measurement of $\mathcal{F}(1)η_{\rm EW}|V_{cb}|$ and form factors to date and the first experimental study of the BGL form factor parameterization in an experimental measurement.

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