HEPData Search

Two-particle small-angle correlations between negative pions and between protons in carbon-carbon collisions atP=4.2 GeV/c per nucleon have been studied, both for an unbiased sample and for “central” events. A comparison of experimental π− π− andpp correlation functions with theoretical predictions has been made. A possible evidence for the existence of two fireballs in C+C interactions atP=4.2 GeV/c per nucleon is presented.

5 data tables

Table 1

THE SECOND REACTION IS TAKEN TO BE 'CENTRAL'.

Table 2

THE SECOND REACTION IS TAKEN TO BE 'CENTRAL' AND P OF PROTONS < 0.3 GEV FOR BOTH REACTIONS.

Table 3

THE SECOND REACTION IS TAKEN TO BE 'CENTRAL' AND E(P=3-4,RF=LAB) < 0.3 GEV ,(P(P=3-4,RF=LAB))**2 < 0.2 GEV**2 FOR ALL REACTIONS.

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CORRELATIONS OF SECONDARY PROTONS IN P NE-20 INTERACTIONS AT 300-GEV/C

Azimov, S.A. ; Allaberdin, M.L. ; Edgorov, S.O. ; et al.

Sov.J.Nucl.Phys. 38 (1983) 890-895, 1983.

Inspire Record 200918 DOI 10.17182/hepdata.17673

None

9 data tables

Table 1

No description provided.

Table 2

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Table 3

No description provided.

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Experimental Test of the Flavor Independence of the Quark - Gluon Coupling Constant

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Kirschfink, F.J. ; et al.

Phys.Lett.B 138 (1984) 317-324, 1984.

Inspire Record 199470 DOI 10.17182/hepdata.6609

Reconstruction of charged D ∗ 's produced inclusively in e + e −. annihilation at CM energies near 34.4 GeV is accomplished in the decay modes D ∗ + → D 0 π + → K − gp + π 0 π + and D ∗ + → D 0 π + → K − gp + π − π + π + and their charge conjugates. Using these and previously reported D ∗ + → D 0 π + → K − gp + π + and D ∗ + → D 0 π + → K − gp + π + + missing π 0 channels we present evidence for hard gluon bremsstrahlung from charm quarks and show that the ratio of the quark-gluon coupling constant of charm quarks to the coupling constant obtained in the average hadronic event, α s c α rms = 100 ± 0.20 ± 1.20 . Our result provides evidence that the quark-gluon coupling constant is independent of flavor.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

Fragmentation of Heavy Quarks Produced in $e^+ e^-$ Annihilation

Fernandez, E. ; Ford, William T. ; Read, Alexander L. ; et al.

Phys.Rev.Lett. 50 (1983) 2054, 1983.

Inspire Record 189417 DOI 10.17182/hepdata.20548

Identification of muons in hadronic events from e+e− annihilation observed in the MAC detector at the storage ring PEP provides flavor tagging of heavy primary quarks. A sample enriched in events from bb¯ production is obtained and the b-quark fragmentation function is inferred from the momentum spectrum of the muons. The b quark is found to fragment predominantly with high values of z, with 〈zb〉=0.8±0.1, and to have an over-all semimuonic branching fraction of (15.5−2.9+5.4)%.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

CHARGED AND NEUTRAL PARTICLES OF LEADING ENERGIES IN INTERACTIONS OF PI- MESONS WITH PHOTOEMULSION NUCLEI AT ENERGIES OF 50-GEV AND 200-GEV. (IN RUSSIAN)

Orlova, G.I. ; Tretyakova, M.I. ; Chernyavsky, M.M. ;

Yad.Fiz. 35 (1982) 706-712, 1982.

Inspire Record 179826 DOI 10.17182/hepdata.17759

None

9 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Muon Pairs and Upper Limit for $\Upsilon$ Production by 280-{GeV} Muons

Bollini, D. ; Frabetti, P.L. ; Heiman, G. ; et al.

Nucl.Phys.B 199 (1982) 27, 1982.

Inspire Record 169127 DOI 10.17182/hepdata.34208

The high mass μ + μ − pairs produced by 280 GeV μ + on a carbon target are studied in a search for the Y production. The high mass continuum in the region 2–18 GeV is interpreted in terms of QED pair production and of μ pairs originating from the decay of hidden and open charm particles as well as of hadrons ( π , K) from deep inelastic interactions. The upper limit for the upsilon production by muons is found to be, at the 90% confidence level, σ γ ·(γ→μ + μ − )<13·10 −39 cm 2 /nucleon.

8 data tables

Table 1

Table 2

Table 3