HEPData Search

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A Measurement of single and double prompt photon production at the CERN anti-p p collider

The UA2 collaboration Alitti, J. ; Ambrosini, G. ; Ansari, R. ; et al.

Phys.Lett.B 288 (1992) 386-394, 1992.

Inspire Record 336186 DOI 10.17182/hepdata.29113

A measurement of the cross-sections for single and double prompt photon production in p p interactions at s = 630 GeV is presented. The data sample corresponds to an integrated luminosity of 13.2 pb −1 . The results are in good agreement with the predictions of perturbative QCD. The signal from double prompt photon production has a statistical significance of 4.3 standard deviations.

2 data tables

Table 1

There is an overall systematic error of 9 pct not included in the table.

Table 2

Errors quoted include statistical and all PT dependent systematic uncertainties. There is in addition a 6.8 pct overall normalization uncertainty.

A Study of multi - jet events at the CERN anti-p p collider and a search for double parton scattering

The UA2 collaboration Alitti, J. ; Ambrosini, G. ; Ansari, R. ; et al.

Phys.Lett.B 268 (1991) 145-154, 1991.

Inspire Record 317817 DOI 10.17182/hepdata.29361

A study of events containing at least four high transverse momentum jets and a search for double parton scattering (DPS) have been performed using data collected with the UA2 detector at the CERN p p Collider (√ s =630 GeV). The results are in good agreement with leading order QCD calculations. A value of σ DPS <0.82 nb at 95% confidence level (CL) is obtained for the DPS cross section.

3 data tables

Table 1

Data requested from authors.

Table 2

Uncorrected cross sections.

Table 3

Upper limit to DPS contribution to 4JET production.

Prompt Electron Production From Delco at {PEP}

The DELCO collaboration Pal, T. ; Atwood, W.B. ; Barish, B.C. ; et al.

Phys.Rev.D 33 (1986) 2708, 1986.

Inspire Record 226886 DOI 10.17182/hepdata.23516

We report final results on prompt electron production in hadronic events from e+e− annihilations at √s =29 GeV, obtained with the DELCO detector at the SLAC storage ring PEP. We find the semielectronic branching ratios of charm and bottom quarks to be B(c→se+νe)=(11.6−0.9 +1.1)% and B(b→ce−ν¯e)=(14.9−1.9 +2.2)% respectively. These results, from the complete data set, are consistent with an earlier analysis of partial data and indicate hard fragmentation functions for both c and b quarks, with mean values 〈zc〉=0.59±0.04 and 〈zb〉=0.72±0.05. The errors indicated here are a combination of statistical and systematic uncertainties.

4 data tables

Table 1

Axis error includes +- 0.0/0.0 contribution (NOT GIVEN).

Table 2

Axis error includes +- 0.0/0.0 contribution (NOT GIVEN).

Table 3

Axis error includes +- 0.0/0.0 contribution (NOT GIVEN).

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PROMPT ELECTRON PRODUCTION IN ELECTRON - POSITRON ANNIHILATIONS AT 29-GeV

Koop, Dale E. ;

CALT-68-1149, 1984.

Inspire Record 201707 DOI 10.17182/hepdata.50118

None

7 data tables

Table 1

Axis error includes +- 9/9 contribution (DUE TO UNCERTAINTIES IN DETECTION EFFICIENCIES//DUE TO UNCERTAINTIES IN LUMINOSITY//DUE TO UNCERTAINTIES IN BACKGROUND SUBSTRUCTIONS).

Table 2

Axis error includes +- 9/9 contribution (DUE TO UNCERTAINTIES IN DETECTION EFFICIENCIES//DUE TO UNCERTAINTIES IN LUMINOSITY//DUE TO UNCERTAINTIES IN BACKGROUND SUBSTRUCTIONS).

Table 3

Axis error includes +- 9/9 contribution (DUE TO UNCERTAINTIES IN DETECTION EFFICIENCIES//DUE TO UNCERTAINTIES IN LUMINOSITY//DUE TO UNCERTAINTIES IN BACKGROUND SUBSTRUCTIONS).