Search

Large data amount, about 1 ab−1 of integrated luminosity, collected in experiments with the Belle detector provided a good possibilities for precise measurements of the hadronic cross sections in e+e− annihilation. Main results obtained in this field with the Belle detector as well as perspectives of the new experiments with the Belle II detector at the SuperKEKB collider is discussed in this report. [ABSTRACT FROM AUTHOR]

We present results obtained by the KLOE Collaboration at the DAфNE e+e− collider located in Frascati Laboratories, Italy. The results concern precise measurements of several η meson decays such as Dalitz slope parameters and charge asymmetries for η → π + π − π 0 $ \eta \to \mathop \pi \nolimits^ + \mathop \pi \nolimits^ - \mathop \pi \nolimits^0 $ , branching ratio and plane asymmetry for η → π + π − e + e − $ \eta \to \mathop \pi \nolimits^ + \mathop \pi \nolimits^ - \mathop {\rm{e}}\nolimits^ + \mathop {\rm{e}}\nolimits^ - $ , and first observation of η → e + e − e + e − $ \eta \to \mathop {\rm{e}}\nolimits^ + \mathop {\rm{e}}\nolimits^ - \mathop {\rm{e}}\nolimits^ + \mathop {\rm{e}}\nolimits^ - $ along with its branching ratio determination. Also preliminary studies of η → π 0 γ γ $ \eta \to \mathop \pi \nolimits^0 \gamma \gamma $ decay channel are presented as well as physics perspectives for many different processes for the ongoing KLOE−2 data taking. [ABSTRACT FROM AUTHOR]

Belle II experiment at the SuperKEKB collider is a major upgrade of the Belle experiment at the KEKB asymmetric e+e− collider at the KEK. The experiment will focus on the search for new physics beyond the standard model via high precision measurement of heavy flavor decays and search for rare signals. In this talk, we present the status of the SuperKEKB collider and the Belle II detector. [ABSTRACT FROM AUTHOR]

The reaction e+e−→ π+ π−π0η has been studied in the experiment with the SND detector at the VEPP-2000 e+e− collider. The reaction proceeds via the four intermediate states: ωη, φη, a0ρ, and structureless π+π−π0η state, which may be, for example, ρ(1450) with ρ(1450) → ρ(770)η. The total e+e−→ π+π−π0η cross section and cross section for the four intermediate states have been measured and fitted in the vector meson dominance model. [ABSTRACT FROM AUTHOR]

Recent SND results on the study of the process e+e−→ π0γ are presented. The study is based on data collected with the SND detector on the VEPP-2M and VEPP-2000 e+e− colliders with an integrated luminosity of 25 and 46 pb−1, respectively. The VEPP-2M data used in this analysis are recorded in the center-of-mass energy range 0.60-1.38 GeV, while the VEPP-2000 data in the range 1.05-2.00 GeV. [ABSTRACT FROM AUTHOR]

At the end of 2016 the SND detector resumed data taking at the upgraded VEPP-2000 e+e− collider. The analysis of data accumulated in 2010-2013 with an integrated lumonosity of 70 pb−1 is continuing. Recent results on measurements of various hadronic cross sections are presented. [ABSTRACT FROM AUTHOR]

The CMD-3 detector is installed at the VEPP-2000 e+e− collider at BINP (Novosibirsk, Russia). It is a general-purpose detector, equipped with a tracking system, two crystal (CSI and BGO) calorimeters, liquid Xe calorimeter, TOF and muon systems. The main goal of experiments at CMD-3 is a study of exclusive modes of e+e−→ hadrons at energies s ≤ 2 $ \sqrt s \le $ GeV. In particular, these results provide an important input for calculation of the hadronic contribution to the muon anomalous magnetic moment. The first round of data taking was performed in 2011–2013, when about 60 1/pb were taken in the center-of-mass (c.m.) energy range from 0.32 to 2.0 GeV. Here we present a survey of results of data analysis. Between 2013 and 2016 the collider and the detector were upgraded. The data taking resumed by the end of 2016. In the first run after the upgrade about 50 1/pb were collected at the energy range between 1.28 and 2.007 GeV. We discuss the upgrade and the first preliminary results from the new data. [ABSTRACT FROM AUTHOR]

The investigation of η' → ππη allows to study ππ and ηπ interactions and the possible influence of the scalar states f0(600) and a0(980) on the decay dynamics. 1.7 fb-1 of data taken with the KLOE detector at the DAΦNE e+e- collider have been analyzed with respect to the charged decay mode η' → π+π-η. 7900 ± 90 event candidates have been extracted and can be used for a Dalitz plot analysis. [ABSTRACT FROM AUTHOR]