香料工厂的光子对生产具有每千分之一的精度

事件generator BABAYAGA中的矩阵元素和Parton Shower

Matrix elements and Parton Shower in the event generator BABAYAGA

一个新版本的事件发生器BABAYAGA，这是基于原来的匹配的Parton淋浴方法与完整的精确O（α）矩阵元素的QED辐射修正的Bhabha过程中的香料工厂。与独立计算相比，改进的发生器的理论精度保守估计为0.2%。该发生器是一个有用的工具，精确的光度测定在香料工厂，质心能量低于10 GeV。

Bhabha散射的Monte Carlo程序简介

Mini-review on Monte Carlo programs for Bhabha scattering

我们审查的Monte Carlo发电机目前用于模拟的大角度Bhabha过程中的电子-正电子对撞机的适度高的能量（风味工厂），在约1 GeV和10 GeV之间的质量中心的能量。它示出了如何达到目前的Bhabha程序的物理在香料工厂的理论精度是在0.1%的水平，因此，达到约十年前的亮度监测通过小角度Bhabha散射在LEP。

$τ^-\toπ^-γν_τ$ as a source of background on the Lepton Flavour Violating decay $τ^-\toμ^-γ$

We calculate the decay of $τ^-\toπ^-γν_τ$ in the framework of Resonance Chiral Theory ($RχT$). By demanding the high energy constraints from QCD on the related form factors, we could predict the various physical observables of $τ^-\toπ^-γν_τ$ without any free parameter. Our results show that for a realistic cut on the photon energy (around $100$ MeV) this mode gives a branching ratio of roughly $0.1%$ that should have already been detected at the heavy-flavour factories. Another interesting subject we have studied based on our calculation of the decay $τ^-\toπ^-γν_τ$ is the experimental backgr…

精确味物理时代的黄金模B^0 -> J/psi K_{S,L}

The Golden Modes B^0 -> J/psi K_{S,L} in the Era of Precision Flavour Physics

B^0 -> J/N K_{S,L}通道是未完成的CP破坏探测。我们详细研究了标准模型的不确定性，它与卡比博抑制的企鹅贡献有关，并指出这些通常被忽视的效应实际上可以通过CP不对称性和B^0 -> J/π ^0衰变的分支比明确地考虑进去。使用最新的B工厂测量，我们发现提取的β值的负移，这软化了幺正三角形拟合中的张力。此外，该策略可用于限制B^0- \bar B^0混合中可能的新物理相。所提出的策略对于充分利用寻找这种新物理学的巨大准确性至关重要，这种新物理学可以在LHC和未来的超级风味工厂中实现。

精确味物理与超对称性

Precision Flavour Physics and Supersymmetry

我们回顾了我们最近报道的在B衰变、标准模型和最小超对称标准模型（MSSM）的几个变体中的CKM么正三角形轮廓的比较研究的显著特征，以及由此产生的CP破坏相$α$、$β$和$γ$。这些理论的特点是在夸克味混合矩阵的一个单一的阶段，并引起定义明确的贡献，在K和B衰变的味变化中性流过渡。我们分析了超对称性对Bd-Bd（bar）和Bs-Bs（bar）系统的质量差（$ΔM_d$和$ΔM_s$）以及K衰变中CP破坏量$|epsilon|$的贡献。我们的分析表明，在标准模型和MSSM模型中的预测范围$β$是非常相似的。然而，在B工厂和强子机器上的精确测量也许能够根据另外两个CP破坏相$α$和$γ$来区分这些理论。（对L.B. Festschrift的贡献）奥肯，出现在物理报告，编辑的特刊。V.L. Telegdi和K.冬季）

在轻子风味违反的介子、tau和规范玻色子衰变中产生ALP

ALP production in Lepton Flavour Violating meson, tau and gauge boson decays

研究ALP在μ子阈值以上质量范围内的轻子风味违反耦合，分析其在介子、W玻色子和tau衰变中的产生机制，评估未来对撞机和实验设施对ALP与带电轻子相互作用的探测能力。

Hadron physics potential of future high-luminosity B-factories at the Upsilon(5S) and above

We point out the physics opportunities of future high-luminosity B-factories at the Upsilon(5S) resonance and above. In this paper we discuss numerous interesting investigations, which can be performed in the e+e- centre-of-mass energy region from the Upsilon(5S) and up to 11.5 GeV, where an efficient data taking operation should be possible with the planned B-factories. These studies include abundant Bs production and decay properties; independent confirmation and if found, exhaustive exploration of Belle's claimed charged bottomonia; clarification of puzzles of interquarkonium dipion transit…

Status and accuracy of the Monte Carlo generators for luminosity measurements

The status and accuracy of the precision Monte Carlo generators used for luminosity measurements at flavour factories is reviewed. It is shown that, thanks to a considerable, long-term effort in tuned comparisons between the predictions of independent programs, as well as in the validation of the generators against the presently available calculations of the next-to-next-to-leading order QED corrections to Bhabha scattering, the theoretical accuracy reached by the most precise tools is of about one per mille. This error estimate is valid for realistic experimental cuts, appears to be quite rob…

BABAYAGA活动generator

The BABAYAGA event generator

BABAYAGA程序是一个用于调味品工厂QED过程的事件发生器，主要用于质心范围1-10 GeV的e+ e对撞机的光度测量。最近，还添加了pi+ pi-通道。利用量子电动力学中的粒子簇射模拟了相应的光子辐射修正。理论精度的方法估计和一些唯象的结果进行了讨论。

NLOPS精度下的辐射返回

Radiative return at NLOPS accuracy

研究利用辐射返回和能谱扫描测量π介子形变因子，通过计算NLO修正并结合部分子喷注描述单光子发射，验证了在味工厂高精度测量中的数值结果。

Towards global analysis of b --> s l^+ l^-

Flavour changing neutral current decays mediated by b --> s l^+ l^- were under experimental investigation at B-factories and the Tevatron during the last decade and the final analysis are expected soon. Moreover, new data has been released this summer and more is currently taken at the LHC mainly by LHCb. The theoretical methods for both inclusive and exclusive decays have been also refined and a global analysis of these decays becomes more and more feasible. First analysis of combined b --> s l^+ l^- data towards a global analysis provide constraints on the involved short distance couplings. …

达芙妮星的大角度巴巴散射和光度

Large-angle Bhabha scattering and luminosity at Daphne

要精确地了解e^+ e^-味工厂的光度，就需要精确地计算大散射角下的巴巴截面。为了达到理论精度在0.1%的水平，QED辐射校正的相关影响被考虑在框架中的Parton Shower方法，它允许独家事件生成。在此基础上，研制了一个用于数据分析的蒙特卡罗事件发生器（BABAYAGA）。为了测试的方法的可靠性，基准计算，包括精确的O（α）校正和高阶领先的对数贡献，以及开发，实施在蒙特卡洛积分器（LABSPV）和详细比较与BABAYAGA预测。在实际事件选择的情况下，研究和讨论了初态和终态辐射、O（alpha）次超前修正和高阶超前修正的影响. BABAYAGA的理论精密度估计为0.5%水平。

辐射π介子对产生的次领头阶FsQED修正

Next-to-leading order corrections to radiative pion pair production via dispersion relations

研究辐射π介子对产生的次领头阶FsQED修正，通过该方法计算并与其他结果比较，展示对可观测量的影响，纳入额外修正，研究相关机制，新特性在蒙特卡罗事件发生器中实现，可评估π介子 - 光子相互作用建模影响。

$e^+ e^-$ 湮灭中匹配到 Parton Shower 的次领头阶 π 介子对产生

Pion pair production in $e^+ e^-$ annihilation at next-to-leading order matched to Parton Shower

本文提出在QED和sQED中匹配Parton Shower算法的次领头阶$e^+ e^- \to π^+ π^- (γ)$强子道计算，详细探讨了π介子形状因子的处理，并实现在BabaYaga@NLO生成器中用于精密能量扫描模拟。