The Dipion Mass Spectrum In e+e- Annihilation and tau Decay: A Dynamical (rho0, omega, phi) Mixing Approach
M. Benayoun, P. David, L. DelBuono, O. Leitner, H. B. O'Connell
备注：
71 pages, 8 figures. Accepted by EPJ C. Version 3: correct minor typos, minor changes spread out into the text. Extension of Sections 12.2 and 12.3.5 and introduction of the new Appendix D
We readdress the problem of finding a simultaneous description of the pion form factor data in e+e- annihilations and in tau decays. For this purpose, we work in the framework of the Hidden Local Symmetry (HLS) Lagrangian and modify the vector meson mass term by including the pion and kaon loop contributions. This leads us to define the physical rho, omega and phi fields as linear combinations of their ideal partners, with coefficients being meromorphic functions of s, the square of the 4--momentum flowing into the vector meson lines. This allows us to define a dynamical, i.e. s-dependent, vector meson mixing scheme. The model is overconstrained by extending the framework in order to include the description of all meson radiative (V P gamma and P gamma gamma couplings) and leptonic (Ve+e- couplings) decays and also the isospin breaking (omega/ phi --> pi+ pi-) decay modes. The model provides a simultaneous, consistent and good description of the e+e- and tau dipion spectra. The expression for pion form factor in the latter case is derived from those in the former case by switching off the isospin breaking effects specific to e+e- and switching on those for tau decays. Besides, the model also provides a good account of all decay modes of the form V P gamma, Pgamma gamma as well as the isospin breaking decay modes. It leads us to propose new reference values for the rho^0 --> e+ e- and omega --> pi+ pi- partial widths which are part of our description of the pion form factor. Other topics (phi --> K anti K, the rho meson mass and width parameters) are briefly discussed. Therefore, we confirm the 3.3 sigma discrepancy between the theoretical estimate of a_mu based on e+e- and its direct BNL measurement.
omega --> pi0 gamma* and phi --> pi0 gamma* Transition form factors in dispersion theory
基于色散理论，我们计算了ω--> pi 0 gamma* 和phi --> pi 0 gamma* 电磁跃迁形状因子，仅依赖于先前对相应的三π衰变和π矢量形状因子的色散分析。我们将我们的研究结果与NA 60合作最近对欧米茄--> pi 0 mu+ mu-衰变谱的测量进行比较，并强烈鼓励对Okubo-Zweig-Iizuka禁止的phi --> pi 0 l+ l-衰变进行实验研究，以了解这些转变中发现的与矢量-介子主导的强烈偏差形状因子。
Electron-positron annihilation into phi f_{0}(980) and clues for a new 1^{--} resonance
本文研究了π介子在受圈机制支配的等腰周期波中的e^{+}e^{-}到φ pi pi反应。对于k介子环，我们从传统的RCHPT开始，但使用KbarK-pipi散射的归一化振幅和完整的k介子形状因子而不是最低阶项。我们还研究了矢量介子的作用，并考虑了重矢量介子对K*K跃迁形状因子的影响。在f_{0}（980）附近我们发现了一个与实验相同的双介子不变量质量的峰值。选择phi f_{0}（980）贡献作为e^{+}e^{-}能量的函数，我们也重现了实验数据，除了一个窄峰，支持在phi f_{0}（980）阈值以上存在1^{--}共振，与该状态强耦合。
Extracting the unitarity angle gamma in Bs to D0 h0, D0bar h0 Decays
最近观察到的颜色抑制B 0 bar到D 0 pi 0、D 0 eta、D 0 eta '、Ds+ K-、D 0 K 0 bar、D 0 rho 0和D 0 omega衰减模式的速率都大于预期。在Gronau-London方法中提出的用于提取么正角γ的颜色抑制Bs到D 0 phi、D 0 bar phi模式可以比先前的估计大一个数量级。提出了几种新的理论洁净模式，用于提取γ射线。建议的Bs到D 0 h 0，D 0 bar h 0衰变模式，其中h 0 = pi 0，eta，eta '，rho 0，omega以及h 0 = phi，没有企鹅贡献。它们的衰变率可以通过SU（3）对称性从观测到的颜色抑制的B 0 bar到D 0 h 0速率来估计。这些D 0 h 0，D 0 bar h 0模式，除了D 0 phi，D 0 bar phi模式的组合研究是有用的提取γ在Bs系统中，而不涉及Bs-Bsbar混合。由于b到u和b到c的跃迁属于相同的拓扑图，因此相对强的相位可能很小。在这种情况下，CP不对称性被抑制，并且未标记的速率在伽马提取中非常有用。
The perspectives of decoding the nature of the a0(980) and f0(980) mesons and of defining the relative phase between the three-gluon and one-photon amplitudes in the J/psi decays
Heavy Quark Symmetry in Isosinglet Nonleptonic B-Decays
我们使用软共线有效理论中的因式分解定理以及重夸克对称性来对B-> D^（*）M进行模型无关的预测，其中M={eta，eta '，phi，omega}。包括这些等单重态介子的胶子生产。我们预测了B-> DM和B-> D*M通道的分支分数相等，并在λ QCD/Q和α（Q）级进行了修正，其中Q=m_b，m_c，或E_M。我们还预测Br（B^0-> D eta '）/Br（B^0-> D eta）=tan^2（theta）= 0.67和Br（B-> D phi）/Br（B-> D omega）< 0.2，这里也有α（sqrt{E*Lambda}）修正。这些结果与现有的数据吻合得很好。构造了这些衰变中SU（3）破坏的一个检验。
Vector to pseudoscalar meson radiative transitions in chiral theory with resonances
给出了当V= ρ 0，omega，phi和P= pi 0，eta时，矢量介子V到赝标介子P和轻子对l+l-的转换跃迁的形状因子.我们的方法是基于共振的手征有效场论。通过改变唯一的自由参数sigma_V，将omega -> pi gamma* 跃迁的归一化形状因子拟合到最近的NA 60数据。将结果与可用数据和其他模型的预测进行比较。
