测量\(B\to D^{*}\ell\nu_{\ell}\)的角系数：对\(|V_{cb}|\)的影响及轻子味普适性检验

Measurement of Angular Coefficients of B[over ¯]→D^{*}ℓν[over ¯]_{ℓ}: Implications for |V_{cb}| and Tests of Lepton Flavor Universality.

作者信息

Prim M T, Bernlochner F, Metzner F, Aihara H, Asner D M, Aushev T, Ayad R, Babu V, Banerjee Sw, Behera P, Belous K, Bennett J, Bessner M, Bhardwaj V, Bhuyan B, Bilka T, Biswas D, Bodrov D, Bondar A, Borah J, Bračko M, Branchini P, Browder T E, Budano A, Campajola M, Cao L, Červenkov D, Chang P, Cheon B G, Choi S-K, Choi Y, Choudhury S, Cochran J, Das S, Dash N, De Nardo G, De Pietro G, Dhamija R, Di Capua F, Doležal Z, Dong T V, Dubey S, Ecker P, Epifanov D, Ferber T, Ferlewicz D, Fulsom B G, Garg R, Gaur V, Giri A, Goldenzweig P, Gu T, Gudkova K, Hadjivasiliou C, Hara T, Hayashii H, Hazra S, Hedges M T, Herrmann D, Hernández Villanueva M, Hou W-S, Hsu C-L, Inami K, Inguglia G, Ipsita N, Ishikawa A, Itoh R, Iwasaki M, Jacobs W W, Kiesling C, Kim C H, Kim D Y, Kim K-H, Kodyš P, Konno T, Korobov A, Korpar S, Kovalenko E, Križan P, Krokovny P, Kuhr T, Kumar M, Kumar R, Kwon Y-J, Lam T, Lee S C, Lewis P, Li L K, Li Gioi L, Libby J, Liventsev D, Ma Y, Matsuda T, Matvienko D, Maurya S K, Meier F, Merola M, Miyabayashi K, Mizuk R, Mohanty G B, Nakamura I, Nakao M, Narwal D, Natkaniec Z, Natochii A, Nayak L, Nishida S, Ono H, Oskin P, Pakhlov P, Pakhlova G, Park S-H, Passeri A, Patra S, Pedlar T K, Pestotnik R, Piilonen L E, Podobnik T, Prencipe E, Röhrken M, Rout N, Russo G, Sandilya S, Santelj L, Savinov V, Schmolz P, Schnell G, Schwanda C, Seino Y, Senyo K, Shan W, Shiu J-G, Singh J B, Solovieva E, Starič M, Stottler Z S, Sumihama M, Takizawa M, Tanida K, Tenchini F, Tiwary R, Trabelsi K, Unno Y, Uno S, Urquijo P, Usov Y, Vahsen S E, Varvell K E, Vossen A, Wang M-Z, Wang X L, Won E, Yabsley B D, Yan W, Yang S B, Yin J H, Yuan L, Zhang Z P, Zhilich V, Zhukova V

出版信息

Phys Rev Lett. 2024 Sep 27;133(13):131801. doi: 10.1103/PhysRevLett.133.131801.

DOI:10.1103/PhysRevLett.133.131801

PMID:39392959

Abstract

We measure the complete set of angular coefficients J_{i} for exclusive B[over ¯]→D^{}ℓν[over ¯]_{ℓ} decays (ℓ=e, μ). Our analysis uses the full 711 fb^{-1} Belle dataset with hadronic tag-side reconstruction. The results allow us to extract the form factors describing the B[over ¯]→D^{} transition and the Cabibbo-Kobayashi-Maskawa matrix element |V_{cb}|. Using recent lattice QCD calculations for the hadronic form factors, we find |V_{cb}|=(40.7±0.7)×10^{-3} using the Boyd-Grinstein-Lebed parametrization, compatible with determinations from inclusive semileptonic decays. We search for lepton flavor universality violation as a function of the hadronic recoil parameter w and investigate the differences of the electron and muon angular distributions. We find no deviation from standard model expectations.

摘要

我们测量了排他性(B^0\to D^{\ell}\nu_{\ell})衰变（(\ell = e,\mu)）的全套角系数(J_i)。我们的分析使用了具有强子标记侧重建的完整的(711,\mathrm{fb}^{-1}) Belle数据集。这些结果使我们能够提取描述(B^0\to D^)跃迁的形状因子以及卡比博 - 小林 - 益川矩阵元(|V_{cb}|)。利用最近对强子形状因子的格点量子色动力学计算，我们使用博伊德 - 格林斯坦 - 勒贝德参数化方法得到(|V_{cb}|=(40.7\pm0.7)\times10^{-3})，这与从包含性半轻子衰变得到的结果一致。我们寻找作为强子反冲参数(w)的函数的轻子味普适性破坏，并研究电子和缪子角分布的差异。我们没有发现与标准模型预期的偏差。