Hadron reactions study with the CMD-3 detector in e+e− collisions

2016 ◽  
Vol 31 (33) ◽  
pp. 1630038
Author(s):  
E. P. Solodov ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
V. S. Banzarov ◽  
...  
Keyword(s):  
Energy Range ◽  
Invariant Mass ◽  
Energy Dependence ◽  
Cross Section ◽  
Cross Sections ◽  
Final States ◽  
Preliminary Results ◽  
Mass Distributions ◽  
Electron Positron ◽  
Intermediate States

The CMD-3 detector has been taking data since December 2010 at the VEPP-2000 electron–positron collider. The collected data sample corresponds to about 60 inverse picobarn of integrated luminosity in the c.m. energy range from 0.32 GeV to 2.0 GeV. Preliminary results of the analysis of various hadronic cross-sections, in particular, [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], 3[Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text] are presented. The processes with multi-hadron final states have several intermediate states which have to be taken into account to correctly describe the angular and invariant mass distributions, as well as cross-section energy dependence.

scholarly journals ENERGY LOSS IN CONDENSED MATTER OF H1 AND He4 IN THE ENERGY RANGE 4 < E < 30 kev

1962 ◽  
Vol 40 (12) ◽  
pp. 1749-1764 ◽  
Author(s):  
Arie Van Wijngaarden ◽  
Henry E. Duckworth
Keyword(s):  
Thin Films ◽  
Aluminum Oxide ◽  
Energy Loss ◽  
Energy Range ◽  
Energy Dependence ◽  
Cross Section ◽  
Cross Sections ◽  
Condensed Matter ◽  
Forward Direction ◽  
Electronic Component

Measurements are reported of the energy loss suffered by H1 and He4 particles, of 4- to 30-kev energy, in passing through thin films of carbon, aluminum oxide, and VYNS. Only those particles that emerged in the forward direction were studied. Evidence is presented for identifying the stopping cross sections per atom observed in this way with Se, the electronic component of the total stopping cross section per atom. It appears that the calculated energy dependence of [Formula: see text] is somewhat in error, and that the magnitudes of the Se's for He4 are systematically too small by 10–15%.

scholarly journals Preliminary results on CMD-3 measurement of e+e−→ π+π− cross section

2019 ◽  
Vol 218 ◽  
pp. 02006 ◽  
Author(s):  
Fedor Ignatov ◽  
I.B. Logashenko ◽  
R.R. Akhmetshin ◽  
A.N. Amirkhanov ◽  
A.V. Anisenkov ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Range Analysis ◽  
Preliminary Results ◽  
Electron Positron ◽  
Integrated Luminosity

The CMD-3 detector has been successfully collecting data at the electron-positron collider VEPP-2000 since December 2010. The first scan below 1 GeV for a π+π− measurement was performed in 2013. The collected data sample corresponds to about 18 pb−1 of integrated luminosity in this energy range. Analysis of the e+e−→ π+π− cross section is in progress. Status of this measurement are presented.

scholarly journals HADRONIC CROSS SECTION MEASUREMENT AT CMD-3

2014 ◽  
Vol 35 ◽  
pp. 1460387
Author(s):  
R. R. AKHMETSHIN ◽  
A. V. ANISENKOV ◽  
V. M. AULCHENKO ◽  
V. S. BANZAROV ◽  
L. M. BARKOV ◽  
...  
Keyword(s):  
Data Analysis ◽  
Energy Range ◽  
Cross Section ◽  
Cross Section Measurement ◽  
Preliminary Results ◽  
Hadronic Cross Section ◽  
Section Measurement ◽  
Electron Positron

The VEPP-2000 electron-positron collider was commissioned in 2010. About 60 pb-1 were collected so far by CMD-3 detector in the whole available c.m. energy range from 0.32 GeV to 2.0 GeV. The preliminary results of data analysis for various modes of e+e− → hadrons are discussed.

scholarly journals MEASUREMENT OF THE $e^+e^- \to p \bar{p}$ CROSS SECTION WITH THE CMD-3 DETECTOR AT VEPP-2000

2014 ◽  
Vol 35 ◽  
pp. 1460457 ◽  
Author(s):  
R. R. AKHMETSHIN ◽  
A. V. ANISENKOV ◽  
V. M. AULCHENKO ◽  
V. S. BANZAROV ◽  
L. M. BARKOV ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Drift Chamber ◽  
Event Selection ◽  
Preliminary Results ◽  
Electron Positron ◽  
Clean Sample ◽  
Good Agreement ◽  
Integrated Luminosity

We report preliminary results on the measurement of the [Formula: see text] cross section with the CMD-3 detector at the VEPP-2000 electron-positron collider based on 4.5 pb-1 of integrated luminosity collected in the c.m. energy range 1.92 - 2.0 GeV. Event selection using information from the Drift Chamber and Calorimeters provides a clean sample of [Formula: see text] events. The obtained results are in good agreement with the previous measurements.

scholarly journals STUDY OF THE PROCESS e+e- → K+K-π+π- WITH THE CMD-3 DETECTOR AT THE VEPP-2000 e+e- COLLIDER

2014 ◽  
Vol 35 ◽  
pp. 1460450
Author(s):  
R. R. AKHMETSHIN ◽  
A. V. ANISENKOV ◽  
V. M. AULCHENKO ◽  
V. S. BANZAROV ◽  
L. M. BARKOV ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Preliminary Results ◽  
Intermediate States ◽  
The Cross

We report preliminary results on the measurement of the cross section of the process e+e- → K+K-π+π- in the c.m. energy range from 1.5 GeV to 2 GeV. It is shown that the cross section is dominated by the contributions of several intermediate states K+K-ρ, K*Kπ, ϕπ+π- and K*K*.

PHOTOPRODUCTION OF π0π+ ON THE PROTON AND DEUTERON AT Eγ = 0.7 - 1.5 GeV

2010 ◽  
Vol 19 (05n06) ◽  
pp. 1197-1204 ◽  
Author(s):  
A. MUSHKARENKOV ◽  
V. BELLINI ◽  
J. P. BOCQUET ◽  
L. CASANO ◽  
A. D'ANGELO ◽  
...  
Keyword(s):  
Total Cross Section ◽  
Energy Range ◽  
Invariant Mass ◽  
Cross Section ◽  
Photon Energy ◽  
Mass Spectra ◽  
Photon Energy Range ◽  
Free Proton ◽  
Preliminary Results ◽  
Good Agreement

The preliminary results obtained by the GRAAL collaboration for the π0π+ photoproduction on the free and quasi-free proton (deuteron) at Eγ = 0.7-1.5 GeV are presented. The total cross section of the γp → π0π+n reaction and invariant mass spectra for the π+π0, π+n and π0n systems are presented in the photon energy range from 0.7 to 1.5 GeV. These results are in good agreement with the 2π-MAID calculations.

scholarly journals Study of the e+e−→ KS KLπ0 process up to 2 GeV with the CMD-3 detector at the VEPP-2000 collider

2019 ◽  
Vol 212 ◽  
pp. 04008
Author(s):  
A. V. Semenov ◽  
R. R. Akhmetshin ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
...  
Keyword(s):  
Total Cross Section ◽  
Energy Range ◽  
Cross Section ◽  
Center Of Mass ◽  
Mass Energy ◽  
Preliminary Results ◽  
Center Of Mass Energy ◽  
Electron Positron ◽  
The Cross

The cross section of the process e+ e−→ KS KL π0 has been studied with the CMD-3 detector at the VEPP-2000 electron-positron collider in the center-of-mass energy range from 1.1 to 2 GeV. Preliminary results on the total cross section of the process are presented.

scholarly journals Study of the processes e+e-→ K+K− + nπ (n = 1,2,3) with the CMD-3 detector at the VEPP-2000 electron-positron collider

2019 ◽  
Vol 218 ◽  
pp. 02008
Author(s):  
G.V. Fedotovich ◽  
R.R. Akhmetshin ◽  
A.N. Amirkhanov ◽  
A.V. Anisenkov ◽  
V.M. Aulchenko ◽  
...  
Keyword(s):  
Cross Sections ◽  
Angular Distributions ◽  
Final State ◽  
Preliminary Results ◽  
Electron Positron ◽  
Intermediate States ◽  
The Cross ◽  
Final Particles ◽  
Integrated Luminosity

The data sample collected in 2011-2013 at the c.m.s. energies between 0.32-2 GeV with the CMD-3 detector operating at the VEPP-2000 e+e− collider is analzed. The collected data corresponds to an integrated luminosity about ∼ 60pb−1. The techniques for determination of the integrated luminosity for each energy setting is described. Some preliminary results of the study of the processes e+e−→ K+ K− + nπ (n = 1,2,3) with two charged kaons in the final state are presented. These processes have several intermediate states, which are important to correctly descript the angular distributions of final particles and the cross sections dependence on the energy.

scholarly journals Study of the process e+e−→ K+K−π0 in the center-of-mass energy range 1.2–2 GeV with the CMD-3 detector

2019 ◽  
Vol 212 ◽  
pp. 04007
Author(s):  
A. L. Erofeev ◽  
R. R. Akhmetshin ◽  
A. N. Amirkhanov ◽  
A. V. Anisenkov ◽  
V. M. Aulchenko ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Center Of Mass ◽  
Mass Energy ◽  
Cross Section Measurement ◽  
Preliminary Results ◽  
Center Of Mass Energy ◽  
Section Measurement ◽  
Electron Positron ◽  
The Cross

The process e+ e−→ K+ K−π0 has been studied in the center-of-mass energy range from 1.2 to 2 GeV using a 80.6 pb−1 data sample collected with the CMD-3 detector at the electron-positron collider VEPP-2000. Preliminary results of the cross-section measurement are presented.

scholarly journals Study of dynamics of the process $$e^+e^-\rightarrow \pi ^+\pi ^-\pi ^0$$ in the energy range 1.15–2.00 GeV

2020 ◽  
Vol 80 (10) ◽  
Author(s):  
M. N. Achasov ◽  
A. Yu. Barnyakov ◽  
A. A. Baykov ◽  
K. I. Beloborodov ◽  
A. V. Berdyugin ◽  
...  
Keyword(s):  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Energy Region ◽  
Dalitz Plot ◽  
Significant Contribution ◽  
Resonance Structure ◽  
Intermediate States ◽  
Order Of Magnitude ◽  
Using Data

AbstractThe dynamics of the process $$ e^+e^- \rightarrow \pi ^+\pi ^-\pi ^0 $$ e + e - → π + π - π 0 is studied in the energy region from 1.15 to 2.00 GeV using data accumulated with the SND detector at the VEPP-2000 $$e^+e^-$$ e + e - collider. The Dalitz plot distribution and $$\pi ^+\pi ^-$$ π + π - mass spectrum are analyzed in a model including the intermediate states $$\rho (770)\pi $$ ρ ( 770 ) π , $$\rho (1450)\pi $$ ρ ( 1450 ) π , and $$\omega \pi ^0$$ ω π 0 . As a result, the energy dependences of the $$\rho (770)\pi $$ ρ ( 770 ) π and $$\rho (1450)\pi $$ ρ ( 1450 ) π cross sections and the relative phases between the $$\rho (770)\pi $$ ρ ( 770 ) π amplitude and the $$\rho (1450)\pi $$ ρ ( 1450 ) π and $$\omega \pi ^0$$ ω π 0 amplitudes are obtained. The $$\rho (1450)\pi $$ ρ ( 1450 ) π cross section has a peak in the energy region of the $$\omega (1650)$$ ω ( 1650 ) resonance (1.55–1.75 GeV). In this energy range the contributions of the $$\rho (770)\pi $$ ρ ( 770 ) π and $$\rho (1450)\pi $$ ρ ( 1450 ) π states are of the same order of magnitude. No resonance structure near 1.65 GeV is observed in the $$\rho (770)\pi $$ ρ ( 770 ) π cross section. We conclude that the intermediate state $$\rho (1450)\pi $$ ρ ( 1450 ) π gives a significant contribution to the decay of $$\omega (1650)\rightarrow \pi ^+\pi ^-\pi ^0$$ ω ( 1650 ) → π + π - π 0 , whereas the $$\rho (770)\pi $$ ρ ( 770 ) π mechanism dominates in the decay $$\omega (1420)\rightarrow \pi ^+\pi ^-\pi ^0$$ ω ( 1420 ) → π + π - π 0 .

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