HEPData Search

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Pion pair production in photon-photon collisions

Blinov, A.E. ; Blinov, V.E. ; Bondar, A.E. ; et al.

Z.Phys.C 53 (1992) 33-39, 1992.

Inspire Record 335707 DOI 10.17182/hepdata.14772

The process γγ→π+π− was measured using the detector MD-1 at VEPP-4. The two-photon reactionse+e−, μ+ μ− and π+ π− pair production were separated using scintillation counters, Cherenkov counters and shower-range chambers. A radiation widthГγγ(f2(1270))=3.1±0.35±0.35 keV was obtained.

1 data table

Table 1

Data read from graph.

Angular distribution of the production of symmetric hadron pairs in pi- p collisions at 40-GeV

Volkov, A.A. ; Kostritsky, A.V. ; Abramov, V.V. ; et al.

JETP Lett. 58 (1993) 486-492, 1993.

Inspire Record 346766 DOI 10.17182/hepdata.40644

None

7 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Narrow baryonia with open and hidden strangeness.

The EXCHARM collaboration Aleev, A.N. ; Balandin, V.P. ; Chvyrov, A.S. ; et al.

Phys.Atom.Nucl. 56 (1993) 1358-1366, 1993.

Inspire Record 344917 DOI 10.17182/hepdata.17233

None

4 data tables

Table 1

NUCLEUS IS P, C, AL, CU.

Table 2

NUCLEUS IS P, C, AL, CU.

Table 3

NUCLEUS IS P, C, AL, CU.

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Study of the reaction pi- p ---> eta-prime eta-prime n

Berdnikov, E.B. ; Bityukov, S.I. ; Borisov, G.V. ; et al.

Z.Phys.C 57 (1993) 13-16, 1993.

Inspire Record 340793 DOI 10.17182/hepdata.14498

The reaction π−p→η′η′n has been studied atpπ=37 GeV/c. Total of 14 events of this reaction have been selected. It has been shown that in the effective mass spectrum of the η′η′ system the events are concentrated mainly near the reaction threshold, which might be caused by the decayX(1910)→η′η′. The reaction cross-section has been evaluated: σ(π−p→η′η′n)=110±40 nb.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

rivet Analysis
Charged particle multiplicity distributions for fixed number of jets in Z0 hadronic decays

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adami, F. ; et al.

Z.Phys.C 56 (1992) 63-76, 1992.

Inspire Record 334948 DOI 10.17182/hepdata.14533

The multiplicity distributions of charged particles in full phase space and in restricted rapidity intervals for events with a fixed number of jets measured by the DELPHI detector are presented. The data are well reproduced by the Lund Parton Shower model and can also be well described by fitted negative binomial distributions. The properties of these distributions in terms of the clan model are discussed. In symmetric 3-jet events the candidate gluon jet is found not to be significantly different in average multiplicity than the mean of the other two jets, thus supporting previous results of the HRS and OPAL experiments. Similar results hold for events generated according to the LUND PS and to the HERWIG models, when the jets are defined by the JADE jet finding algorithm. The method seems to be insensitive for measuring the color charge ratio between gluons and quarks.

3 data tables

Table 1

Corrected charged particle multiplicity for jet resolution parameter YCUT = 0.01.

Table 2

Corrected charged particle multiplicity for jet resolution parameter YCUT = 0.02.

Table 3

Corrected charged particle multiplicity for jet resolution parameter YCUT = 0.04.

Measurement of inclusive production of light meson resonances in hadronic decays of the Z0

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.

Phys.Lett.B 298 (1993) 236-246, 1993.

Inspire Record 342800 DOI 10.17182/hepdata.29001

A study of inclusive production of the meson resonances ρ 0 , K ∗0 (892), ƒ 0 (975) and ƒ 2 (1270) in hadronic decays of the Z 0 is presented. The measured mean meson multiplicity per hadronic event is 0.83 ± 0.14 for the ρ 0 0.64 ± 0.24 for the K ∗0 (892), 0.10 ± 0.04 for the ƒ 0 (975) in the momentum range p > 0.05 p beam ( x p > 0.05) and 0.11 ± 0.05 for the ƒ 2 (1270) for x p > 0.1 . These values and the corresponding differential cross sections ( 1 σ hadr ) d σ d x p for the vector mesons are in good agreement with the predictions of the JETSET 7.3 PS and HERWIG 5.4 models. The ƒ 2 (1270) production is overestimated by HERWIG but its x p -shape is correctly reproduced. The measured ratios of the production cross sections σ(ƒ 2 (1270)) σ(ρ 0 ) = 0.22 ± 0.08 and σ(ƒ 2 (1270)) σ(ƒ 0 (975)) = 3 −1 +7 for x p > 0.1 are consistent with the results obtained in hadronic reactions.

10 data tables

Table 1

Average multiplicity per hadronic event. Extrapolation to x = 0 using the x shape predicted by JETSET 7.3 PS.

Table 2

Average multiplicity per hadronic event. Extrapolation to x = 0 using the x shape predicted by JETSET 7.3 PS.

Table 3

Average multiplicity per hadronic event. Extrapolation to x = 0 using the x shape predicted by JETSET 7.3 PS.

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Dependence of spectra and cross-sections yield of proton at the energy more than 0.4-GeV at fixed angles on atomic weights of colliding nuclei in nucleus-nucleus interactions

Agakishiev, G.N. ; Bekmirzaev, R. ; Kanarek, T. ; et al.

Phys.Atom.Nucl. 56 (1993) 1397-1405, 1993.

Inspire Record 345328 DOI 10.17182/hepdata.17221

None

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Total cross-section of two photon production of hadrons

Baru, S.E. ; Beilin, M.V. ; Blinov, A.E. ; et al.

Z.Phys.C 53 (1992) 219-224, 1992.

Inspire Record 33675 DOI 10.17182/hepdata.14767

The total cross section for γγ→hadrons was measured as a function of the invariant massW of the system (1.25 to 4.25 GeV) at thee+e−-collider VEPP-4 with the detector MD-1. For the first time the data were obtained by detecting both scattered leptons with almost zero emission angles. The mean squared four momentum transfer 〈q2〉 is −0.005 GeV2, the rmsW resolution is 100–250 MeV. The data on the mean charged multiplicity 〈nC〉 are well described by the function 〈nC〉=(1.62 ±0.37)+(1.83±0.45)·ln(W(GeV)). TheW dependence of the total cross section is consistent with the theoretical prediction σ(nb)=240+270/W(GeV).

2 data tables

Table 1

No description provided.

Table 2

No description provided.