Logashenko, I.B.
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Search for rare Phi decays in pi+ pi_ gamma final state

The CMD-2 collaboration Akhmetshin, R.R. ; Aksenov, G.A. ; Anashkin, E.V. ; et al.
Phys.Lett.B 415 (1997) 452-462, 1997.
Inspire Record 451091 DOI 10.17182/hepdata.41643

A search for phi radiative decays has been performed using a data sample of about 2.0 million phi decays collected by the CMD-2 detector at VEPP-2M collider in Novosibirsk. From the selected e+ e- -> pi+ pi- gamma events the following results were obtained: B(phi -> f0(980) gamma) < 1x10-4 for destructive and B(phi -> f0(980) gamma) < 7x10-4 for constructive interference with the Bremsstrahlung process respectively, B(phi -> gamma -> pi+ pi- gamma) < 3x10-5 for E of gamma > 20 MeV, B(phi -> rho gamma) < 7x10-4. From the selected e+ e- -> mu+ mu- gamma events B(phi -> mu+ mu- gamma) = (2.3+-1.0)x10-5 has been obtained for E of gamma> 20 MeV. The upper limit on the P,CP-violating decay eta -> pi+ pi- has also been placed: B(eta -> pi+ pi-) < 9x10-4 . All upper limits are at 90 % C.L.

1 data table
Table 1

Only statistical errors are shown in the table.


rivet Analysis
Measurement of phi meson parameters with CMD-2 detector at VEPP-2M collider

Akhmetshin, R.R. ; Aksenov, G.A. ; Anashkin, E.V. ; et al.
Phys.Lett.B 364 (1995) 199-206, 1995.
Inspire Record 406880 DOI 10.17182/hepdata.28437

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.

1 data table
Table 1

No description provided.


Observation of the Decay $\rho \to \pi^+ \pi^- \gamma$. (In Russian)

Vasserman, I.B. ; Golubev, V.B. ; Dolinsky, S.I. ; et al.
Sov.J.Nucl.Phys. 47 (1988) 1035-1037, 1988.
Inspire Record 272215 DOI 10.17182/hepdata.37130

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


THE STUDY OF INCLUSIVE CHARACTERISTICS OF anti-d d INTERACTIONS AT 12-GeV/c

Batyunya, B.V. ; Boguslavsky, I.V. ; Bruncko, D. ; et al.
JINR-P1-87-849, 1987.
Inspire Record 253758 DOI 10.17182/hepdata.9416

None

8 data tables
Table 1

THE BETTER FIT FOR PI- AND BARIONBAR IS THE SUM OF TWO EXPONENT: A*EXP(-B1*PT**2)+D*EXP(-B2*PT**2).FOR PI- B1=30+-4 AND B2=6.3+-.3 .FOR BARIONBAR B1=46+-18 AND B2=3.9+-.5.

Table 2

No description provided.

Table 3

No description provided.

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Version 2
Measurement of the Properties of the $\Omega$ Meson With a Cryogenic Magnetic Detector

Barkov, L.M. ; Vasserman, I.B. ; Vorobev, P.V. ; et al.
JETP Lett. 46 (1987) 164-167, 1987.
Inspire Record 255953 DOI 10.17182/hepdata.16910

None

2 data tables
Table 1

Fitted peak cross section.

Table 2

The cross section of the process e+e- -> pi+pi-pi0. The value of fitted peak cross section was additionaly corrected by 3.5% for the nuclear interaction loss and 1.2% for Br(pi0->e+e-gamma)


SEARCH FOR THE DECAY K(S) ---> 2 GAMMA

Vasserman, I.B. ; Golubev, V.B. ; Gluskin, E.S. ; et al.
JETP Lett. 43 (1986) 588-590, 1986.
Inspire Record 239033 DOI 10.17182/hepdata.16835

None

1 data table
Table 1

No description provided.


OBSERVATION OF THE PROCESS E+ E- ---> GAMMA GAMMA GAMMA GAMMA

Vasserman, I.B. ; Golubev, V.B. ; Dolinsky, S.I. ; et al.
JETP Lett. 44 (1986) 634-637, 1986.
Inspire Record 241072 DOI 10.17182/hepdata.16909

None

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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RECENT RESULTS OF EXPERIMENTS WITH THE NEUTRAL DETECTOR AT VEPP-2M

Druzhinin, V.P. ; Dubrovin, M.S. ; Eidelman, S.I. ; et al.
IYF-84-93, 1984.
Inspire Record 202875 DOI 10.17182/hepdata.37143

None

1 data table
Table 1

'AXION' IS NEUTRAL BOSON WHICH HAS MASS < 200 MEV. IT IS ASSUMED THAT NEITHER THIS BOSON NOR THE PRODUCTS OF ITS DECAY ARE DETECTED.


Measurement of $\phi$ Meson Radiative Decays at the Storage Ring Vepp-2m With the Neutral Detector

Druzhinin, V.P. ; Golubev, V.B. ; Ivanchenko, V.N. ; et al.
Phys.Lett.B 144 (1984) 136-140, 1984.
Inspire Record 202874 DOI 10.17182/hepdata.6570

Results of the first experiments with the Neutral Detector at the electron-positron storage ring VEPP-2M are presented. Branching ratios of the ø-meson radiative decays have been measured: B ( ø → ηγ )=(1.30±0.06)%, B ( ø → π 0 γ )=(0.130±0.013)%, their accuracy being several times higher than the world average. The width ratio is Γ(ø→ηγ) Γ(ø→π 0 γ)=(10±1) . Using the abovementioned quantities, the ω − ø mixing angle θ v =(38.3±0.2) ° , as well as the ratio between the effective magnetic moments of the s- and u-quarks, μ s μ u =(0.57±0.03) have been calculated.

8 data tables
Table 1

CROSS SECTIONS IN THE PHI MESON PEAK (CORRECTED FOR RADIATIVE EFFECTS).

Table 2

No description provided.

Table 3

SAME AS FIG 2A, BUT KINEMATICAL RECONSTRUCTION ARE APPLIED. I.E. THE ENERGY- MOMENTUM CONSERVATIONS ARE USED TO IMPROVE THE ACCURACY OF PARTICLE ENERGIES AND ANGLES MEASURED IN DETECTOR.

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PRELIMINARY RESULTS FROM THE NEUTRAL DETECTOR AT VEPP-2M

Bukin, A.D. ; Vasserman, I.B. ; Vorobev, P.V. ; et al.
IYF-83-80, 1983.
Inspire Record 192041 DOI 10.17182/hepdata.37136

None

1 data table
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).