Determination of $η\toπ^+π^-π^0$ Dalitz plot slopes and asymmetries with the KLOE detector
The KLOE collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S. Bocch… 展开作者
The KLOE collaboration, F. Ambrosino, A. Antonelli, M. Antonelli, F. Archilli, C. Bacci, P. Beltrame, G. Bencivenni, S. Bertolucci, C. Bini, C. Bloise, S. Bocchetta, F. Bossi, P. Branchini, R. Caloi, P. Campana, G. Capon, T. Capussela, F. Ceradini, F. Cesario, S. Chi, G. Chiefari, P. Ciambrone, F. Crucianelli, E. De Lucia, A. De Santis, P. De Simone, G. De Zorzi, A. Denig, A. Di Domenico, C. Di Donato, B. Di Micco, A. Doria, M. Dreucci, G. Felici, A. Ferrari, M. L. Ferrer, S. Fiore, C. Forti, P. Franzini, C. Gatti, P. Gauzzi, S. Giovannella, E. Gorini, E. Graziani, W. Kluge, V. Kulikov, F. Lacava, G. Lanfranchi, J. Lee-Franzini, D. Leone, M. Martini, P. Massarotti, W. Mei, S. Meola, S. Miscetti, M. Moulson, S. Müller, F. Murtas, M. Napolitano, F. Nguyen, M. Palutan, E. Pasqualucci, A. Passeri, V. Patera, F. Perfetto, M. Primavera, P. Santangelo, G. Saracino, B. Sciascia, A. Sciubba, A. Sibidanov, T. Spadaro, M. Testa, L. Tortora, P. Valente, G. Venanzoni, R. Versaci, G. Xu
We have studied, with the KLOE detector at the DA$Φ$NE $Φ$-Factory, the dynamics of the decay $η\toπ^+π^-π^0$ using $η$ mesons from the decay $ϕ\toηγ$ for an integrated luminosity ${\mathcal L}$ = 450 pb$^{-1}$. From a fit to the Dalitz plot density distribution we obtain a precise measurement of the slope parameters. An alternative parametrization relates the $π^+π^-π^0$ slopes to that for $η\to 3π^0$ showing the consistency of KLOE results for both channels. We also obtain the best confirmation of the $C$-invariance in the $η\toπ^+π^-π^0$ decay.
Dalitz plot analysis of e+ e- --> pi0 pi0 gamma events at SQRT(s) ~ M(phi) with the KLOE detector
本文研究了用KLOE探测器在SQRT（s）~ M（phi）上采集的e+ e-> pi 0 pi 0 γ事例的Dalitz图。在双介子不变质量（Mpp）低于700 MeV的区域中，所研究的过程由非共振过程e+ e-> omega -> pi 0和omega --> pi 0 γ主导，而对于更高的Mpp值，辐射phi衰变到f0（980）是主导机制。使用不同的理论模型来拟合Dalitz图，同时考虑到sigma（600）的可能贡献。对于每个模型，我们提取f0（980）质量及其与pipi，KKbar和phi的耦合。
The decay $η\rightarrow π^+ π^- π^0$ is studied with the KLOE detector, at the DA$ϕ$NE e$^+$e$^-$ collider. Using a data sample corresponding to an integrated luminosity of $1.6$ fb$^{-1}$ a new study of the Dalitz plot is presented.
The paper presents status of three studies involving the $ω$ meson using data collected by the KLOE detector. The first two projects are feasibility studies performed on simulated data concerning an upper limit measure ment of BR($Φ\to ωγ$) and the form factor measurement in the $ω\toπ^0l^+l^-$ dalitz decay. The third study shows the effect $π^0 - π^0$ interference has in the $ω\toπ^+π^-π^0$ Dalitz plot when $ω$ is produced through the $e^+e^-\toωπ^0$ channel.
Working at a $ϕ$-factory, KLOE/KLOE-2 has collected a very large and clean sample of $η$ decays, which allow to perform a variety of precision measurements. This report presents the recent results on the $η$-meson decays from KLOE/KLOE-2 experiments, including the search of the $C$-violating decay $η\rightarrowγγγ$, the determination of the $CP$ asymmetry in $η\rightarrowπ^+π^-e^+e^-$, the precision measurement of the $η\rightarrowπ^+π^-π^0$ Dalitz plot distribution, the search for the $CP$-violating decay $η\rightarrowπ^+π^-$ and the precision measurement of ${\cal O}(p^6)$ dominated decay $η…
We have studied the vector to pseudoscalar conversion decay phi -> eta e+e-, with eta -> pi0pi0pi0, with the KLOE detector at DAPHNE. The data set of 1.7 fb-1 of e+e- collisions at sqrt(s)~Mphi contains a clear conversion decay signal of ~31,000 events from which we measured a value of BR(phi -> eta e+e-)=(1.075+-0.007+-0.038)x10-4. The same sample is used to determine the transition form factor by a fit to the e+e- invariant mass spectrum, obtaining b(phi eta) =(1.17 +- 0.10 + 0.07) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement wit…
We report on the Dalitz plot analyses of B^- \to D^+ π^-π^-, B^+ \to π^+ π^- π^+ and D^+_s \to π^+ π^- π^+. The Dalitz plot method and the most recent BABAR results are discussed.
We describe Dalitz plots arising in studies of $D$-meson decays, and what we have learned from them in recent years. After some mention of technique and history, we focus on decay of the $D^\pm$ and $D_s^\pm$ mesons to the $K^-K^+π^\pm$ final state, and on $D_s^\pm$ decay to $π^+π^-π^\pm$. Some mention of other Dalitz plots involving $D$-meson decays is also made.
Using $1.6$ fb$^{-1}$ of $e^+ e^-\toϕ\toηγ$ data collected with the KLOE detector at DA$Φ$NE, the Dalitz plot distribution for the $η\to π^+ π^- π^0$ decay is studied with the world's largest sample of $\sim 4.7 \cdot 10^6$ events. The Dalitz plot density is parametrized as a polynomial expansion up to cubic terms in the normalized dimensionless variables $X$ and $Y$. The experiment is sensitive to all charge conjugation conserving terms of the expansion, including a $gX^2Y$ term. The statistical uncertainty of all parameters is improved by a factor two with respect to earlier measurements.
We present preliminary results on the measurement of the I=1/2 $K π$ $\mathcal{S}$-wave through a model independent partial wave analysis of $η_c$ decays to $K^0_S K^+ π^-$ and $K^+ K^- π^0$ produced in two-photon interactions. We also perform a Dalitz plot analysis of the $J/ψ$ decays to $π^+ π^- π^0$ and $K^+ K^- π^0$ produced by the initial state radiation process.
Dalitz Plot Analysis of D0 Hadronic Decays D0 -> K0K-pi+, D0 -> K0barK+pi- and D0 -> K0barK+K-
本文给出了D 0强子衰变D 0-> K 0 K-pi+，D 0-> K 0 bar K+ pi-和D 0-> K 0 bar K+ K-的Dalitz图分析。该分析基于在SLAC的PEP-II非对称能量B工厂运行的BABAR探测器在Y（4S）共振上或附近收集的22 fb-1的数据样本。这些事件是从使用衰变D*+ -> D 0 π +的连续e+ e-湮灭中选择的。初步测量了上述强子衰变的分支分数。初步估计的分数和相位的共振和非共振贡献的Dalitz图。
本文给出了强子衰变D_0-> K_0 bar K + K_-中重建的约12500个D_0事例的Dalitz图分析。该分析是基于91.5 fb-1的数据样本收集与BaBar探测器在PEP-II非对称能量e + e-存储环在SLAC运行在质心能量和40 MeV以下的Y4S共振。这些事件是从使用衰变D *+--> D0 π +的e + e-> c cbar湮灭中选择的。BR = γ（D_0-> K_0 bar K + K_-）/γ（D_0-> K_0 bar pi + pi_-）=（15.8 +/-0.1（stat.）+/- 0.5（系统）x 10 - 2还提供了对Dalitz图的共振和非共振贡献的分数和相位的估计。a0（980）--> K Kbar投影已在几乎没有背景的情况下被提取。搜索CP的Dalitz图上的不对称性已被执行。
We present a preliminary measurement of CP-violation parameters in the decay B0->K+K-Ks, using approximately 465 million BBbar events collected by the BABAR detector at SLAC. Reconstructing the neutral kaon as Ks->pi+pi- or Ks->pi0pi0, we analyze the Dalitz plot distribution and measure fractions to intermediate states. We extract CP parameters from the asymmetries in amplitudes and phases between B0 and B0bar decays across the Dalitz plot. From a fit to the whole Dalitz plot, we measure beta_eff = 0.44 +/- 0.07 +/- 0.02, A_CP = 0.03 +/- 0.07 +/- 0.02, where the first uncertainties are statist…
We perform a Dalitz plot analysis of about 100,000 Ds+ decays to K+ K- pi+ and measure the complex amplitudes of the intermediate resonances which contribute to this decay mode. We also measure the relative branching fractions of Ds+ --> K+ K+ pi- and Ds+ --> K+ K+ K-. For this analysis we use a 384 fb-1 data sample, recorded by the BABAR detector at the PEP-II asymmetric-energy e+e- collider running at center-of-mass energies near 10.58 GeV.
We report preliminary results from a study of the decay B0 --> D0bar pi+ pi- using a data sample of 470.9 +/- 2.8 million BBbar events collected with the BaBar detector at the Y(4S) resonance. Using the Dalitz-plot analysis technique, we find contributions from the intermediate resonances D*_2(2460)-, D*_0(2400)-, rho(770)0 and f_2(1270) as well as a pi+ pi- S-wave term, a D0bar pi- nonresonant S-wave term and a virtual D*(2010)- amplitude. We measure the branching fractions of the contributing decays.
We perform an analysis of the $D^+\rightarrow K^0_S π^+ π^0$ Dalitz plot using a data set of 2.92 fb$^{-1}$ of $e^+e^-$ collisions at the $ψ(3770)$ accumulated by the BESIII Experiment, in which 166694 candidate events are selected with a background of 15.1%. The Dalitz plot is found to be well-represented by a combination of six quasi-two-body decay channels ($K^0_Sρ^+$, $K^0_Sρ(1450)^+$, $\overline{K}^{*0}π^+$, $\overline{K}_0(1430)^0π^+$, $\overline{K}(1680)^0π^+$, $\overlineκ^0π^+$) plus a small non-resonant component. We also consider a model-independent approach to confirm an obvious pha…
利用1996-1999年费米实验室KTeV（E832）实验收集的6800万个KL -> 3 pi 0衰变样品，详细研究了KL -> 3 pi 0 Dalitz密度图.我们报告了第一次观察到KL->pi+ pi-pi 0衰变的干扰，其中pi+pi- rescatters在终态相互作用中为2 pi 0。这种再散射效应可以用卡比博-伊西多利模型来描述，它取决于π介子在I=0和I=2态之间散射长度的差异a0-a2。使用Cabibbo-Isidori模型，我们给出了解释再散射效应的KL-> 3 pi 0二次斜率参数的第一次测量。
A Dalitz plot analysis of approximately 13,000 Ds+ decays to pi+pi-pi+ has been performed. The analysis uses a 384 fb-1 data sample recorded by the BaBar detector at the PEP-II asymmetric-energy e+e- storage ring running at center of mass energies near 10.6 GeV. Amplitudes and phases of the intermediate resonances which contribute to this final state are measured. A high precision measurement of the ratio of branching fractions is performed: BR(Ds+ -> pi+pi-pi+)/BR(Ds+ -> K+ K- pi+)=0.199 +/- 0.004 +/- 0.009. Using a model-independent partial wave analysis, the amplitude and phase of the S-wav…
Improved measurement of the CKM angle gamma in B^-+ -> D^(*) K^(*)-+ decays with a Dalitz plot analysis of D decays to K_S^0 pi^+ pi^- and K_S^0 K^+ K^-
We present Dalitz plot analyses for the decays of $B$ mesons to $D^-D^0K^+$ and $\overline{D}^0D^0K^+$. [Charge conjugate reactions are implicitly assumed throughout.] We report the observation of the $D^*_{s1}(2700)^+$ resonance in these two channels and obtain measurements of the mass $M(D^*_{s1}(2700)^+) = 2699^{+14}_{-7}$ MeV/$c^2$ and of the width $Γ(D^*_{s1}(2700)^+) = 127^{+24}_{-19}$ MeV, including statistical and systematic uncertainties. In addition, we observe an enhancement in the $D^0K^+$ invariant mass around 2350--2500 MeV/$c^2$ in both decays $B^0 \to D^-D^0K^+$ and $B^+ \to \o…
We present a time-dependent Dalitz plot measurement of CP violation parameters in B0 --> Ks Pi+ Pi- decays. These results are obtained from a large data sample that contains 657 million BBbar pairs collected at the Y(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. For the CP violation parameters, we obtain two consistent solutions that describe the data well. The first of these solutions may be preferred by external information from other measurements. There is no evidence for direct CP violation in B0 --> rho0(770) Ks, B0 --> f0(980) Ks and B0 --> K*+(892) P…
