We report results on the branching fraction ($\mathcal{BF}$) measurement of the color-suppressed decays $\bar{B}^0\to D^0 π^0$, $D^{*0}π^0$, $D^0η$, $D^{*0}η$, $D^0ω$, $D^{*0}ω$, $D^0η^{\prime}$, and $D^{*0}η^{\prime}$. The result is based on a sample of $(454\pm 5)\times 10^{6} B\bar{B}$ pairs collected at the $Υ(4S)$ resonance from 1999 to 2007, with the $\babar$ detector at the PEP-II storage rings at the Stanford Linear Accelerator Center. The measurements are compared to theoretical predictions by factorization, SCET and pQCD.
Using CLEO-c data, we confirm the observation of D0 ->omega eta by BESIII. In the Dalitz Plot of D0 -> Kshort eta pi0, we find a background in the Kshort(->pipi)pi0 projection with a m(pipipi0) equal to the omega(782) mass. In a direct search for D0 -> (omega eta) we find a clear signal and measure BF(D0 ->omega eta) = (1.78+/-0.19+/-0.14) x 10**(-3), in good agreement with BESIII.
Branching Fraction Measurements of the Color-Suppressed Decays B0bar to D(*)0 pi0, D(*)0 eta, D(*)0 omega, and D(*)0 eta_prime and Measurement of the Polarization in the Decay B0bar to D*0 omega
B Meson Decays to eta(')K*, eta(')rho,eta(')pi0, omegapi0, and phipi0
We present measurements of the branching fractions and charge asymmetries (where appropriate) of two-body B decays to eta(')K*, eta(')rho, eta(')pi0, omegapi0, and phipi0. The data were recorded with the BABAR detector at PEP-II and correspond to 89x10^6 BB pairs produced in e+e- annihilation through the Upsilon(4S) resonance. We find significant signals for two decay modes and measure the branching fractions BR(B+->etaK*+)=(25.6+/-4.0+/-2.4)x10^{-6} and BR(B0->etaK*0)=(18.6+/-2.3+/-1.2)x10^{-6}, where the first error is statistical and the second systematic. We also find evidence with signifi…
We present the recent measurements of the B0 -> eta' K0 and the B -> omega K decay modes based on the full data set of 772x10^6 BBbar pairs collected by the Belle detector at the KEKB e+e- collider. In the B0 -> eta' K^{0} mode, we obtain the CP-violating parameters A(eta'K0) = +0.03+/-0.05(stat)+/-0.04(syst), S(eta'K0) = +0.68+/-0.07(stat)+/-0.03(syst). This is the world's most precise result on the eta' K0 CP parameters. In B -> omega K decays, we measure the branching fractions B(B0 -> omega K0) = (4.5+/-0.4(stat)+/-0.3(syst))x10^-6, B(B- -> omega K-) = (6.8+/-0.4(stat)+/-0.4(syst))x10^-6, …
The Dalitz decays eta -> e^+e^-g and omega -> pi^0 e^+e^- have been measured in the g p -> eta p and g p -> omega p reactions, respectively, with the A2 tagged-photon facility at the Mainz Microtron, MAMI. The value obtained for the slope parameter of the electromagnetic transition form factor of eta, Lambda^{-2}_eta=(1.97+/-0.11_tot) GeV^{-2}, is in good agreement with previous measurements of the eta -> e^+e^-g and eta -> mu^+mu^-g decays. The uncertainty obtained in the value of Lambda^{-2}_eta is lower than in previous results based on the eta -> e^+e^-g decay. The value obtained for the o…
Branching fractions for chi_cJ -> p p-bar pi^0, p p-bar eta, and p p-bar omega
使用CESR e^+e^-对撞机上的CLEO-c探测器获得的2590万psi（2S）衰变样本，我们报告了衰变chi_cJ -> p p-bar pi ^0、p p-bar eta和p p-bar omega的分支分数，其中J= 0，1，2。我们对B（chi_cJ-> p p-bar pi ^0）和B（chi_cJ-> p p-bar eta）的结果与以前的测量结果一致，但比以前的测量结果更精确。此外，我们还包括了B（chi_cJ-> p p巴Ω）的第一次测量。
Suppressed Decays of D_s^+ Mesons to Two Pseudoscalar Mesons
利用CLEO-c探测器在Ds ~*+ Ds ~-产生能Ecm = 4170 MeV附近收集的数据，研究了Ds ~+介子衰变为两个赝标介子的过程.我们报告的搜索单Cabibbo抑制Ds+衰变模式K+ eta，K+ eta '，pi+ K 0 S，K+ pi 0，和同位旋禁止的衰变模式Ds+到pi+ pi 0。我们相对于Cabibbo偏好的Ds+模式pi+ eta、pi+ eta '和K+ KoS进行归一化，并获得分支分数的比率：Ds+至K+ eta / Ds+至pi+ eta =（8.9 +-1.5 +-0.4）%，Ds+对K+ eta' / Ds+对pi+ eta' =（4.2 +-1.3 +-0.3）%，Ds+至pi+ K 0 S/ Ds+至K+ K 0 S =（8.2 +- 0.9 +- 0.2）%，Ds+至K+ pi 0/ Ds+至K+ K 0 S =（5.0 +- 1.2 +- 0.6）%，Ds+至pi+ pi 0/ Ds+至K+ K 0 S < 4.1%（90% CL），其中不确定度分别为统计和系统不确定度。
Study of the Process e+ e- --> omega pi0 --> pi0 pi0 gamma in c.m. Energy Range 920--1380 MeV at CMD-2
用cm. m测量了过程e+ e-> omega pi 0--> pi 0 pi 0 γ的截面。能量范围为920-1380 MeV。它的能量依赖性很好地描述了ρ（770）和ρ '（1450）介子衰变到ω π 0的干涉。直接过程e+ e-> pi 0 pi 0 gamma，eta pi 0 gamma的截面的上限已经设定。
We present herein the most recent BABAR results on direct CP asymmetry measurements in B -> Xs gamma, on partial branching fraction and CP asymmetry measurements in B -> Xs l+l-, on a search for B -> pi/eta l+l- decays, on a search for lepton number violation in B -> X-l+l'+ modes and a study of B-> omega omega and B-> omega phi decays.
I report BESIII preliminary results on: 1 Measurement of sigma(e+e- ->DDbar at Ecm = 3.773 GeV 2 Study of the DDbar production line shape near Ecm = 3.773 GeV 3 The first observation of singly Cabibbo-suppressed decay, D -> omega pi 4 Measurement of BF(Ds+ -> eta' X) and BF(Ds+ -> eta' rho+) .
Study of the Process e+ e- --> pi0 pi0 gamma in c.m. Energy Range 600--970 MeV at CMD-2
用cm. m测量了过程e+ e-> pi 0 pi 0 γ的截面。能量范围600- 970 MeV。测定了下列分支比：B（ρ-> pi 0 pi 0 γ）=（5.2^{+1.5}_{-1.3} +-0.6）× 10 ^{-5}和B（ω-> pi 0 pi 0 γ）=（6.4^{+2.4}_{-2.0} +-0.8）× 10 ^{-5}。得到了ρ-> f 0（600）γ衰变的证据：B（ρ-> f 0（600）γ）=（6.0^{+3.3}_{-2.7} \pm 0.9）× 10 ^{-5}。通过对过程e+ e-> eta pi 0 gamma的搜索，获得了以下上限：在90% CL时，B（ω--> eta pi 0 gamma）< 3.3 × 10^{-5}。
利用CESR的CLEO~II探测器收集的e ~+e ~-湮没数据，我们观测到了Ds ~+到ω π ~+的衰变。这个终态可能是通过Ds+的湮灭衰变或终态相互作用产生的。我们发现一个分支比[Gamma（Ds+ to omega pi+）/Gamma（Ds+ to eta pi+）]=0.16+-0.04+-0.03，其中第一个误差是统计的，第二个是系统的。
Branching ratios of the decays of psi(3770) and Upsilon(10580) into light hadrons
考虑到关于D^{ \ast \pm }（2010）的全宽的新数据以及带电和中性美介子B^ \pm、B^0、\bar B^0的质量差，衰变的分支比为psi（3770）、Uppermance（10580）到pi^+pi^-、K bar K、ρ（omega）pi、ρ（omega）eta、ρ（omega）eta^prime、K^ast bar K+ c. c，rho^+ rho^-和K^ast bar K^ast在模型中被重新评估，在该模型中，由于在psi（3770）的情况下的真实中间状态D \bar D和在Uppersion（10580）的情况下的B \bar B，Okubo-Zweig-Iizuka规则被违反。本文讨论了Psi（3770）和Uppersons（10580）到轻强子的包容性湮灭。
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
Measurements of the CKM angle beta in charmless loop-dominated B meson decays at BaBar
本文报道了无粲中性B介子衰变到K+ K-K 0（包括共振衰变phiK 0和f0 K 0），eta'K 0，pi 0 K 0 s，K 0 sK 0 sK 0 s，K 0 sK 0 s，rho 0 K 0 s，omegaK 0 s的含时CP破坏不对称性的初步测量结果。这些结果是从SLAC PEP-2非对称能量B介子工厂的BaBar探测器收集的Y（4S）共振下e+e湮灭产生的高达3.47亿个BBbar对的数据样本中获得的。
