Drift chamber for the CMD-3 detector Grancagnolo, F.; Fiore, G.; Ignatov, F.V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
11/2010, Letnik:
623, Številka:
1
Journal Article
Recenzirano
The construction, digitizing electronics and results of test with cosmic rays of cylindrical drift chamber for CMD-3 detector are described. To uniformly fill the sensitive volume small hexagonal ...cells were chosen. The coordinate along the wire is measured by charge division technique. A resolution in the R–ϕ-plane of better than 110μm and about 3mm along the wire as well as a dE/dx resolution of about 12% were obtained in cosmic test runs.
We present a measurement of the pion form factor based on e+e− annihilation data from the CMD-2 detector in the energy range 0.6<s<1.0 GeV with a systematic uncertainty of 0.8%. A data sample is five ...times larger than that used in our previous measurement.
The process e+e−→ϕ→K+K− has been studied with the CMD-2 detector using about 542 000 events detected in the center-of-mass energy range from 1.01 to 1.034 GeV. The systematic error of the cross ...section is estimated to be 2.2%. The ϕ(1020) meson parameters in the ϕ→K+K− decay channel have been measured: σ0(ϕ→K+K−)=2016±8±44 nb, mϕ=1019.441±0.008±0.080 MeV/c2, Γϕ=4.24±0.02±0.03 MeV, Be+e−BK+K−=(14.27±0.05±0.31)×10−5.
The cross-section of the process e+e−→π+π− has been measured using about 114000 events collected by the CMD-2 detector at the VEPP-2M e+e− collider in the center-of-mass energy range from 0.61 to ...0.96 GeV. Results of the pion form factor determination with a 0.6% systematic uncertainty are presented. The following values of the ρ- and ω-meson parameters were found: Mρ=(776.09±0.81) MeV, Γρ=(144.46±1.55) MeV, Γ(ρ→e+e−)=(6.86±0.12) keV, Br(ω→π+π−)=(1.33±0.25)%. Implications for the hadronic contribution to the muon anomalous magnetic moment are discussed.
The ϕ(1020) meson leptonic width has been determined from the combined analysis of 4 major decay modes of the resonance (ϕ→K+K−,KL0KS0,π+π−π0,ηγ) studied with the CMD-2 detector at the VEPP-2M e+e− ...collider. The following value has been obtained: Γ(ϕ→e+e−)=1.235±0.006±0.022 keV. The ϕ(1020) meson parameters in four main decay channels have been also recalculated: B(ϕ→K+K−)=0.493±0.003±0.007, B(ϕ→KLKS)=0.336±0.002±0.006, B(ϕ→π+π−π0)=0.155±0.002±0.005, B(ϕ→ηγ)=0.0138±0.0002±0.0002.
The results of the experiment on the measurement of the e+e− → π+π− cross section in a cm energy range of 370–520 MeV are presented. The systematic measurement error is equal to 0.7%. In the vector ...dominance model, the pion electromagnetic radius is calculated using all the CMD-2 data on the pion form factor. The cross section for the production of a muon pair is measured in the energy range of the experiment.
A superconducting rectifier fluxpump has been used for the dc power supply of the magnet system of the CMD-2 detector on the VEPP-2M collider at the Budker Institute of Nuclear Physics in Russia ...since 1989. The fluxpump provides a complete pumping cycle: charging the magnet system, stabilization of the magnetic field, and discharging. The fluxpump consists of an air-core current step-up superconducting transformer and two groups of thermally controlled superconducting switches arranged as a fullwave rectifier. Critical output current during the test was 5.4 kA. The accuracy of the field stabilization provided by the fluxpump is 2.5/spl middot/10/sup -5/. The fluxpump has exhibited reliable and safe operation during its entire history of use.
Results of the measurement of the φ meson parameters with the general purpose detector CMD-2 at the upgraded
e
+
e
− collider VEPP-2M at Novosibirsk are presented. This is the first measurement of ...the four major φ decay modes in a single
e
+
e
− experiment. The results based on about 55,600 identified hadronic events are consistent with previous measurements, and have precision comparable to the current world average.
Drift chamber for the CMD-3 detector Grancagnolo, F.; Fiore, G.; Ignatov, F.V. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
2009, 2009-1-00, Letnik:
598, Številka:
1
Journal Article
Recenzirano
The construction, digitizing electronics and results of test with cosmic rays of cylindrical drift chamber for CMD-3 (Cryogenic Magnetic Detector) detector are described. To uniformly fill sensitive ...volume small hexagonal cells were chosen. A coordinate along wire is measured by charge division technique. Resolution in
R
–
φ
-plane better than
100
μ
m
and about 2
mm along wire as well as
d
E
/
d
x
resolution about 12% in cosmic test runs were obtained.
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