Preliminary results of the SND experiment at the VEPP-2000 e+e− collider are presented. Data corresponding to about 40 pb−1 of integrated luminosity were collected in the e+e− c.m. energy range from ...1.05 to 2.00 GeV. The cross sections for e+e− → ωπ0, π+π−4π0, ${\rm{p\bar p}}$, ${\rm{n\bar n}}$ have been measured.
A project aimed at measuring the neutron electromagnetic form factor in the reaction e{sup +}e{sup -} {yields} nn-bar with the SND detector at the VEPP-2000 e{sup +}e{sup -} collider is presented. ...The results obtained for the time resolution of the NaI(Tl) counter using flash-ADC are reported along with estimates of the efficiency of separation of neutron-antineutron events.
A project aimed at measuring the neutron electromagnetic form factor in the reaction
e
+
e
−
→
n
with the SND detector at the VEPP-2000
e
+
e
−
collider is presented. The results obtained for the ...time resolution of the NaI(Tl) counter using flash-ADC are reported along with estimates of the efficiency of separation of neutron-antineutron events.
Status of the KEDR detector Anashin, V.V; Aulchenko, V.M; Baibusinov, B.O ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
02/2002, Volume:
478, Issue:
1
Journal Article
Peer reviewed
KEDR is a general-purpose detector for experiments at the VEPP-4M e
+e
−-collider in the energy range 2
E=2.0–
12
GeV
. All detector subsystems (except the aerogel Cherenkov counters) have been ...installed into the detector at VEPP-4M. Some preliminary data have been taken in the energy region of the J/Ψ meson. The tuning of the detector and the VEPP-4M collider is in progress. Preliminary results on the detector performance are presented. The future experimental program for the KEDR detector is discussed.
The cross section for the process e+e- --> omega pi0 --> pi0 pi0 gamma has been measured in the energy range 1.05--2.00 GeV. The experiment has been performed at the e+e- collider VEPP-2000 with the ...SND detector. The measured e+e- --> omega pi0 cross section above 1.4 GeV is the most accurate to date. Below 1.4 GeV our data are in good agreement with the previous SND and CMD-2 measurements. Data on the e+e- --> omega pi0 cross section are well described by the VMD model with two excited rho-like states. From the measured cross section we have extracted the gamma^* --> omega pi0 transition form factor. It has been found that the VDM model cannot describe simultaneously our data and data obtained from the omega --> pi0 mu+ mu- decay. We have also tested CVC hypothesis comparing our results on the e+e- --> omega pi0 cross section with data on the tau- --> omega pi- nu_{tau} decay.
Spherical Neutral Detector (SND) is a general purpose non-magnetic detector for experiments at VEPP-2000 e+e− collider in Novosibirsk in the energy range 2E=0.4–2.0GeV. Charged particle track ...coordinates are measured using drift and proportional chambers placed in a common gas volume. Particle identification is performed using energy deposition in the drift chamber at low particle momenta p⩽300MeV and aerogel threshold counters at high particle momenta p⩾300MeV. Photon energies are measured using 3-layer spherical electromagnetic calorimeter. Muons penetrating the detector and cosmic background muons are detected by the muon system based on proportional tubes and plastic scintillator counters. At present the detector is operating at VEPP-2000.
First results on the nucleon form factors from SND Achasov, M.N.; Barnyakov, A.Yu; Beloborodov, K.I. ...
Nuclear physics. Section B, Proceedings supplement,
April-June 2012, 2012-4-00, Volume:
225-227
Journal Article
Results of the first measurements of the cross sections for the e+e−→pp¯ and e+e−→nn¯ with the SND detector are presented. The analysis is based on data with integrated luminosity of 2.8pb−1, ...collected in 2011 by the SND detector at the VEPP-2000 e+e− collider in the energy range above nucleon production threshold.
First results of SND experiments at VEPP-2000 Achasov, M.N.; Aulchenko, V.M.; Barnyakov, A.Yu ...
Nuclear physics. Section B, Proceedings supplement,
April-June 2012, 2012-4-00, Volume:
225-227
Journal Article
Preliminary results on e+e−→3π,4π,ωπ0,ηπ+π−,pp¯,nn¯ cross sections obtained with SND detector at VEPP-2000 collider are reported. The data were collected in 2010–2011 in the energy range 2E=1.0–2.0 ...GeV.
We present preliminary results of a new high-precision determination of the
τ lepton mass performed with the KEDR detector at the VEPP-4M
e
+
e
−
collider. These results are compared to two recent
τ ...lepton mass measurements at Belle and BaBar.
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