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ASSOCIATED pi0 PRODUCTION IN EVENTS WITH A PARTICLE OF HIGH TRANSVERSE MOMENTUM AT S**(1/2) = 63-GeV

The CERN-Dortmund-Heidelberg-Warsaw collaboration Doroba, K. ; Drijard, D. ; Fischer, H.G. ; et al.

Z.Phys.C 24 (1984) 31, 1984.

Inspire Record 199391 DOI 10.17182/hepdata.16215

Events with a single highpT charged particle were recorded with the Split-Field-Magnet Detector in proton-proton collisions at the CERN-ISR. In the jet opposite to the trigger region the densities of photons and reconstructed neutral pions were measured with a liquid argon shower counter. Scaled momentum distributions of these particles are given and compared with those of charged pions. The spectra of charged and neutral pions coincide. The production cross-section of neutrals in the away jet shows no dependence on the flavour of the trigger particle.

1 data table

Table 1

No description provided.

rivet Analysis
Charged Multiplicity Distribution in p p Interactions at ISR Energies

The Ames-Bologna-CERN-Dortmund-Heidelberg-Warsaw collaboration Breakstone, A. ; Campanini, R. ; Crawley, H.B. ; et al.

Phys.Rev.D 30 (1984) 528, 1984.

Inspire Record 196601 DOI 10.17182/hepdata.23637

The multiplicities of charged secondaries in proton-proton collisions were determined using the split-field-magnet detector at the CERN Intersecting Storage Rings (ISR). Measurements are presented on multiplicity distributions both for inelastic and non-single-diffractive events at four different energies s=30.4, 44.5, 52.6, and 62.2 GeV. The results reported here represent the first high-statistics measurement of charged multiplicity distributions at ISR energies with a magnetic detector covering nearly the full solid angle.

4 data tables

Table 1

INELASTIC EVENTS.

Table 2

NON-SINGLE-DIFFRACTIVE EVENTS.

Table 3

Moments of the multiplicity distributions for Inelastic events.

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High $p_T K^\pm / \pi^\pm$ Production in $p p$ Collisions at the {ISR}: Strangeness Suppression and Gluon Effects

The Ames-Bologna-CERN-Dortmund-Heidelberg-Warsaw collaboration Breakstone, A. ; Buchanan, C.D. ; Campanini, R. ; et al.

Phys.Lett.B 135 (1984) 510-514, 1984.

Inspire Record 193431 DOI 10.17182/hepdata.30589

The ratios of high p T charged kaon to pion production cross sections at √ s = 45 and 62 GeV are presented. The values of the K ± π ± ratios are essentially independent of both √ s and x T = 2p T √s and are compatible with a strangeness suppression factor λ = 0.55. By contrast, the K − π − values fall with x T suggesting a gluonic origin of K − . QCD calculations agrees with the measurements.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Bose-einstein Correlations in $\alpha \alpha$, $p p$ and $p \bar{p}$ Interactions

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Phys.Lett.B 129 (1983) 269-272, 1983.

Inspire Record 190654 DOI 10.17182/hepdata.30661

Bose-Einstein correlations between pions produced in the central region of rapidity in αα, pp and p p interactions have been studied at the ISR. The parameters r and τ c -often interpreted as the radius and depth of the π-emitting region - are found to be independent of incident particle type but to depend on the mean charged multiplicity. In high multiplicity events, the pions appear to originate from a larger space-time region.

12 data tables

Table 1

FOR DEFINITION OF R++ SEE PAPER.

Table 2

FOR DEFINITION OF R++ SEE PAPER.

Table 3

FOR DEFINITIONS OF R++ AND TAU*C SEE PAPER.

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The Dominance of Jets at Large Transverse Energy in a Full Azimuth Hadron Calorimeter at {ISR} Energies

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Phys.Lett.B 128 (1983) 354-360, 1983.

Inspire Record 190652 DOI 10.17182/hepdata.30701

Events with a large transverse energy in a calorimeter with full azimuthal coverage and | y | < 0.9 have been investigated in pp collisions at √ s = 30, 45, and 63 GeV. A striking change in the event structure, corresponding to a clear emergence of high- p T jets, is observed at √ s = 63 and 45 GeV in the region between 25 and 35 GeV in transverse energy. At √ s = 30 GeV, the data extend to E T ∼ 20 GeV, but no such change in the event structure is observed.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Production of $\pi^0$ and Eta0 at 11-degrees in $p p$ Collisions at $\sqrt{s}=63$-{GeV}

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Z.Phys.C 18 (1983) 5, 1983.

Inspire Record 188928 DOI 10.17182/hepdata.16326

The inclusive π0 production cross-section and the η/π0 ratio have been measured inpp collisions at$\sqrt s= 63 GeV$ at the CERN Intersecting Storage Rings in the rapidity range 2.00

2 data tables

Table 1

No description provided.

Table 2

No description provided.

High $p_T$ Direct Photon Production at 11-degrees in $p p$ Collisions at $\sqrt{s}=63$-{GeV}

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Phys.Lett.B 123 (1983) 367-372, 1983.

Inspire Record 188929 DOI 10.17182/hepdata.30744

The production of direct photons has been measured relative to π 0 's in the rapidity range 2.00 < y < 2.75 in pp collisions at s = 63 GeV at the CERN Intersecting Storage Rings. The γ/π 0 ratio increases from ⪅2% at p T = 1.5 GeV/ c to ∼8% at p T = 4.25 GeV/ c , similar to the value observed near 90°. The results indicate no strong enhancement of single-photon production due to quark bremsstrahlung in this kinematic region.

1 data table

Table 1

No description provided.

Inclusive $\Delta^{++}$ and $\Lambda$ Production in Proton Proton Interactions at {ISR} Energies

Drijard, D. ; Fabbri, F. ; Fischer, H.G. ; et al.

Z.Phys.C 21 (1984) 321, 1984.

Inspire Record 188801 DOI 10.17182/hepdata.16280

Inclusive cross sections forΔ++ production inpp interactions at different ISR energies are presented. The differential cross sectiondσ/dx forΔ++ production is found to be approximately independent of Feynmanx. No strong energy dependence is seen over the ISR energy range. The topological cross sections ofΔ++ at$\sqrt s= 62$ GeV show an appreciable contribution from non-diffractive production mechanisms. An upper limit for theΔ0 production cross section is determined.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Hadron and Hadron Pair Production at Large Transverse Momentum in $p \bar{p}$ and $p p$ Interactions at the {ISR}

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Phys.Lett.B 121 (1983) 439-444, 1983.

Inspire Record 182425 DOI 10.17182/hepdata.30813

We have measured the production of one and two large transverse momentum hadrons in p p and pp interactions in the range 2 < p T < 6 GeV/ c for the central rapidity region |y| < 0.9 at s = 63 and 31 GeV . No statistically significant difference between p p and pp collisions is observed. The results are in accordance with lowest order QCS perturbative calculations and rule out a large contribution of Constituent Interchange Model (CIM), di-quark of quark-fusion subprocesses in this kinematic range.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Direct Evidence for the Emergence of Jets in Events Triggered on Large Transverse Energy in $p p$ Collisions at $\sqrt{s}=63$-{GeV}

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Phys.Lett.B 118 (1982) 185-192, 1982.

Inspire Record 179517 DOI 10.17182/hepdata.30854

We present data obtained from a 1.7 sr hadron calorimeter, triggered on transverse energy, in pp collisions at s =63 GeV at the CERN-ISR. From the change in the distribution of energy in the calorimeter, we extract the cross section for two-constituent hard scattering for p T between 6 and 14 GeV at y = 0. The decrease of this jet cross section over this p T range is consistent with exp (− bp T ), with b = (1.02 ± 0.09) GeV −1 . The slope and normalization of the cross section agree well with a QCD motivated Monte Carlo model. The ratio between jet and single particle cross sections [ dσ JET / dp T )/( dσ π 0 / dp T )]| y = 0 changes from about 200 at 6 GeV to about 1500 at 14 GeV.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

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ASSOCIATED pi0 PRODUCTION IN EVENTS WITH A PARTICLE OF HIGH TRANSVERSE MOMENTUM AT S**(1/2) = 63-GeV

rivet Analysis
Charged Multiplicity Distribution in p p Interactions at ISR Energies

High $p_T K^\pm / \pi^\pm$ Production in $p p$ Collisions at the {ISR}: Strangeness Suppression and Gluon Effects

Bose-einstein Correlations in $\alpha \alpha$, $p p$ and $p \bar{p}$ Interactions

The Dominance of Jets at Large Transverse Energy in a Full Azimuth Hadron Calorimeter at {ISR} Energies

Production of $\pi^0$ and Eta0 at 11-degrees in $p p$ Collisions at $\sqrt{s}=63$-{GeV}

High $p_T$ Direct Photon Production at 11-degrees in $p p$ Collisions at $\sqrt{s}=63$-{GeV}

Inclusive $\Delta^{++}$ and $\Lambda$ Production in Proton Proton Interactions at {ISR} Energies

Hadron and Hadron Pair Production at Large Transverse Momentum in $p \bar{p}$ and $p p$ Interactions at the {ISR}

Direct Evidence for the Emergence of Jets in Events Triggered on Large Transverse Energy in $p p$ Collisions at $\sqrt{s}=63$-{GeV}