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rivet Analysis
Production of $\pi^0 \pi^0$ and $\pi^0 \eta$ in Photon - Photon Collisions

Edwards, C. ; Partridge, Richard ; Peck, C. ; et al.

Phys.Lett.B 110 (1982) 82-86, 1982.

Inspire Record 168793 DOI 10.17182/hepdata.30959

We investigate the four-photon final state produced in γγ colissions. In the π 0 π 0 channel we observe f(1270) production with predominantly helicity 2 and measure a partial width Γ γγ 2.9 +0.6 −0.4 ± keV (independent of assumptions on the helicity). We observe A 2 (1310) production in the π 0 η channel and find a partial width Γ γγ = 0.77 ± 0.18 ± 0.27 KeV (assuming helicity 2). We give an upper limit for f ≈ ηη .

3 data tables

Table 1

Data read from graph. Systematic error on M is of order of 2% or less.

Table 2

Data read from graph.

Table 3

No description provided.

INCLUSIVE PRODUCTION OF MESONS IN n p INTERACTIONS AT 3.83-GeV/c

Abdivaliev, A. ; Besliu, K. ; Gasparian, A.P. ; et al.

JINR-P1-81-437, 1981.

Inspire Record 167522 DOI 10.17182/hepdata.39060

None

7 data tables

Table 1

Table 2

Table 3

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Evidence for Planar Events and a Forward Double Jet Structure in Deep Inelastic Muon Scattering

The European Muon collaboration Aubert, J.J. ; Bassompierre, G. ; Becks, K.H. ; et al.

Phys.Lett.B 100 (1981) 433-438, 1981.

Inspire Record 164536 DOI 10.17182/hepdata.31213

The final states of charged hadrons produced in 280 GeV μp scattering are analysed with respect to their planarity and jet structure. Distributions of p ⊥ 2 in and p ⊥ out 2 are presented. A two jet structure in the forward hemisphere is observed for events with high p ⊥ tracks are predicted by QCD models.

2 data tables

Table 1

PTIN**2 is the sum of the PTIN components squared.

Table 2

PTOUT**2 is the sum of the PTOUT components squared.

Diffractive Production of 3 $\pi$ States at 63-{GeV} and 94-{GeV}

The ACCMOR collaboration Daum, C. ; Hertzberger, L. ; Hoogland, W. ; et al.

Nucl.Phys.B 182 (1981) 269-336, 1981.

Inspire Record 156369 DOI 10.17182/hepdata.34314

Diffractive production of the 3 π system has been studied at 63 and 94 GeV using a two magnet spectrometer with high, uniform acceptance. The total number of events used in the analysis is ∼600 000. The A 2 meson is shown to be diffractively produced. The existence of a resonant component in both the 1 + and 2 − enhancements is established and resonance parameters for the corresponding A 1 and A 3 mesons are given. There are several indications in the data of states which would correspond to radial excitations in the quark model.

4 data tables

Table 1

SEE C. DAUM ET AL., PL 89B, 276 (1980) (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+486> RED = 486 </a>), AND THE RECORD (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+420> RED = 420 </a>) OF THE GENEVA CONFERENCE PREPRINT, B. ALPER ET AL. (1979).

Table 2

SEE C. DAUM ET AL., PL 89B, 281 (1980) (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+487> RED = 487 </a>), AND THE RECORD (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+419> RED = 419 </a>) OF THE GENEVA CONFERENCE PREPRINT, G. THOMPSON ET AL. (1979).

Table 3

SEE C. DAUM ET AL., PL 89B, 285 (1980) (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+488> RED = 488 </a>), AND THE RECORD (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+421> RED = 421 </a>) OF THE GENEVA CONFERENCE PREPRINT, B. ALPER ET AL. (1979).

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INELASTIC ELECTRON PHOTON SCATTERING AT MODERATE FOUR MOMENTUM TRANSFERS

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Grigull, R. ; et al.

Phys.Lett.B 99 (1981) 287-291, 1981.

Inspire Record 155594 DOI 10.17182/hepdata.27125

We present new high statistics data on hadron production in photon-photon reactions. The data are analyzed in terms of an electron-photon scattering formalism. The dependence of the total cross section of Q 2 , the four-momentum transfer squared of the scattered electron, and on the mass W of the hadronic system is investigated. The data are compared to predictions from Vector-Meson Dominance and the quark model.

3 data tables

Table 1

No description provided.

Table 2

DEPENDENCE ON VISIBLE HADRONIC INVARIANT MASS.

Table 3

Data read from graph.

Backward $K^{*0}$ Production in $\pi^- p \to \Lambda^0 K^+ \pi^-$ Reaction at 9-{GeV}/$c$ and 12-{GeV}/$c$

Ferrer, A. ; Treille, D. ; Rivet, P. ; et al.

Nucl.Phys.B 178 (1981) 373-391, 1981.

Inspire Record 153782 DOI 10.17182/hepdata.34397

We have analysed about 85 000 fast Λ 0 events, obtained in a fast proton triggered experiment performed at the CERN-Ω spectrometer at 9 and 12 GeV/ c incident π − beam. Nearly 2500 Λ 0 K + π − events have been isolated. We find strong production of quasi-two-body processes Λ 0 K ∗0 and ∑ ∗− K + consistent with u -channel hyperon exchange. Results on Λ 0 polarization, K ∗0 decay parameters and differential cross sections are given for Λ 0 K ∗0 (892) and Λ 0 K ∗0 (1430) final states. A comparison is made with the associated backward Λ 0 (1520) K ∗0 production seen in the four-prong reaction π − p→pK − K + π − obtained in the same experiment.

8 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

EXPONENTIAL FIT TO DN/DU.

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Direct Photon Production at the $\psi$

Scharre, D.L. ; Alam, M.S. ; Boyarski, A. ; et al.

Phys.Rev.D 23 (1981) 43, 1981.

Inspire Record 153865 DOI 10.17182/hepdata.24079

We present results of a detailed analysis of inclusive direct photon production at the ψ(3095). The direct-photon momentum distribution for x>0.4 is presented and compared with the leading-order quantum-chromodynamic prediction. The total production rate is found to be consistent with theoretical expectations, but the observed momentum distribution is considerably softer. Results of an analysis of some inclusive properties of the hadronic system recoiling against the direct photon are presented. The mean charged-particle and Ks multiplicities are presented as functions of the invariant mass of the hadronic system. These data agree well with the corresponding mean multiplicities measured in e+e− annihilations at center-of-mass energies comparable to the invariant mass of the hadronic system.

4 data tables

Table 1

TOTAL INCLUSIVE PHOTON MOMENTUM SPECTRUM. ERRORS ARE STATISTICAL ONLY.

Table 2

PHOTON SPECTRUM PREDICTED FROM MEASUREMENT OF THE PI0 AND ETA DISTRIBUTIONS. ERRORS INCLUDE BOTH STATISTICAL AND RELATIVE SYSTEMATIC COMPONENTS.

Table 3

INCLUSIVE PI0 MOMENTUM DISTRIBUTION. QUOTED ERRORS ARE STATISTICAL ONLY. OVERALL AND RELATIVE SYSTEMATIC ERRORS ARE LESS THAN 30 PCT AND MAY VARY SLOWLY WITH X.

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Study of the Reaction $\bar{p} p \to p X$ at 22.4-{GeV}/$c$

The Alma Ata-Dubna-Helsinki-Kosice-Moscow-Prague-Tbilisi collaboration Batyunya, B.V. ; Boguslavsky, I.V. ; Dashian, N.B. ; et al.

Sov.J.Nucl.Phys. 33 (1981) 64-66, 1981.

Inspire Record 154173 DOI 10.17182/hepdata.69635

None

49 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Study of the Scaling in the Mean and of the Associative Multiplicity in Inclusive $K^0_S$ and $\Lambda$ Production in $\bar{P} P$ Interactions at 22.4-{GeV}/c.

The Dubna-Alma Ata-Helsinki-Moscow-Prague-Tbilisi collaboration Batyunya, B.V. ; Boguslavsky, I.V. ; Gramenitsky, I.M. ; et al.

Sov.J.Nucl.Phys. 33 (1981) 373, 1981.

Inspire Record 154157 DOI 10.17182/hepdata.39558

None

33 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Search for the Production of a New Quark Flavor at the Highest {PETRA} Energies

Barber, D.P. ; Becker, U. ; Benda, H. ; et al.

Phys.Rev.Lett. 44 (1980) 1722, 1980.

Inspire Record 152616 DOI 10.17182/hepdata.20702

This paper reports the results of a study of hadron production in e+e− collisions at c.m. system energies of 33, 35, and 35.8 GeV. Production of a new quark flavor has been sought. The measured values of the total cross section, the thrust distributions, and the study of inclusive muon production show no evidence for the production of a new charge-23e quark near threshold. In addition, during an energy scan in the region 29.9<~s<~31.6 GeV, no hadron resonance indicating the existence of a bound state composed of charge-23e quarks has been found.

3 data tables

Table 1

No description provided.

Table 2

ENERGY SCAN IN 20 MEV STEPS.

Table 3

THRUST DISTRIBUTION (1/N)*DN/DTHRUST AT 29.9 TO 31.6 AND 35 GEV. THESE DATA ARE RATHER DETECTOR DEPENDENT.

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rivet Analysis
Production of $\pi^0 \pi^0$ and $\pi^0 \eta$ in Photon - Photon Collisions

INCLUSIVE PRODUCTION OF MESONS IN n p INTERACTIONS AT 3.83-GeV/c

Evidence for Planar Events and a Forward Double Jet Structure in Deep Inelastic Muon Scattering

Diffractive Production of 3 $\pi$ States at 63-{GeV} and 94-{GeV}

INELASTIC ELECTRON PHOTON SCATTERING AT MODERATE FOUR MOMENTUM TRANSFERS

Backward $K^{*0}$ Production in $\pi^- p \to \Lambda^0 K^+ \pi^-$ Reaction at 9-{GeV}/$c$ and 12-{GeV}/$c$

Direct Photon Production at the $\psi$

Study of the Reaction $\bar{p} p \to p X$ at 22.4-{GeV}/$c$

Study of the Scaling in the Mean and of the Associative Multiplicity in Inclusive $K^0_S$ and $\Lambda$ Production in $\bar{P} P$ Interactions at 22.4-{GeV}/c.

Search for the Production of a New Quark Flavor at the Highest {PETRA} Energies