Neal, H.
Max results
Sort by Reverse order

Showing 10 of 5987 results

Date

Interferometry results from the CERN WA98 experiment

Rosselet, L. ; Angelis, A.L.S. ; Doenni, P. ; et al.
Nucl.Phys.A 610 (1996) 256C-263C, 1996.
Inspire Record 432737 DOI 10.17182/hepdata.36463

None

1 data table
Table 1

PRELIMINARY DATA. THE DISTRIBUTION (1/PT)*D(N)/D(PT) HAS BEEN FITTED BY A FORMULA SQRT(MT)*K1(SLOPE*MT), WHERE K1 IS THE MAKDONALD FUNCTION.


Hadron distributions: Recent results from the CERN experiment NA44

The NA44 collaboration Xu, Nu ; Bearden, I.G. ; Bøggild, H. ; et al.
Nucl.Phys.A 610 (1996) 175C-187C, 1996.
Inspire Record 432743 DOI 10.17182/hepdata.36469

Proton distributions at midrapidity have been measured for 158A·GeV Pb+Pb collisions in the focusing spectrometer experiment NA44 at CERN. A high degree of nuclear stopping is found in the truly heavy ion collisions. Systematic results of single particle transverse momentum distributions of pions, kaons, and protons, of 200A·GeV S+S and 158A·GeV Pb+Pb central collisions will be addressed within the context of thermalization. By comparing these data with thermal and transport models, freeze-out parameters such as the temperature parameter T fo and mean collective flow velocity 〈β〉 are extracted. Preliminary results of the particle ratios of K − K + and p p are discussed in the context of cascade models of RQMD and VENUS.

1 data table
Table 1

CENTRAL COLLISIONS: SIG(TRIG)/SIG(GEOM)=10%.


WA97 results on strangeness production in lead lead collisions at 158-A-GeV/c

The WA97 collaboration Andersen, E. ; Andrighetto, A. ; Antinori, F. ; et al.
Nucl.Phys.A 610 (1996) 165C-174C, 1996.
Inspire Record 432744 DOI 10.17182/hepdata.36503

Preliminary results from WA97 measurements on Λ, Ξ and Ω production in lead-lead and proton-lead collisions are presented, along with a comparison of WA97 proton-lead data with previous WA85 proton-tungsten results. The ratio Ω gX seems to be enhanced in lead initiated reactions compared to proton initiated reactions.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

PRELIMINARI DATA.

More…

Total and differential cross-sections of p + p ---> pi+ + d reactions down to 275-keV above threshold

The GEM collaboration Drochner, M. ; Ernst, J. ; Fortsch, S ; et al.
Phys.Rev.Lett. 77 (1996) 454-457, 1996.
Inspire Record 431032 DOI 10.17182/hepdata.19580

The p+p→π++d reaction is studied at excess energies between 0.275 and 3.86 MeV. Differential and total cross section were measured employing a magnetic spectrometer with nearly 4π acceptance in the center of mass system. The measured anisotropies between 0.008 and 0.29 indicate that the p wave is not negligible even so close to threshold. The data are compared to other data offering no evidence for charge symmetry breaking or time reversal violation. The s-wave and p-wave contributions at threshold are deduced.

1 data table
Table 1

The CONST is p-wave contribution to the cross section. The differential cross section is fitted usig the relations 4*pi*D(SIG)/D(OMEGA) = SIG + CONST*P2(COS(THETA)), where P2 denotes the Legendre polynomial.


Search for the production of pionium atoms near threshold

Betker, A.C. ; Cameron, J.M. ; Jacobs, W.W. ; et al.
Phys.Rev.Lett. 77 (1996) 3510-3513, 1996.
Inspire Record 429517 DOI 10.17182/hepdata.19609

We propose a model-independent method to extract a linear combination of the s-wave π−π scattering lengths by measuring the γγ decay branching ratio for a tagged sample of π+π− atoms (pionium). In the first experimental search for an appropriate tagging reaction, we observed σtot=76±21±11pb for free pion pair production in pd→3Heπ+π− 1.0 MeV above threshold. This result suggests a pionium production cross section ≲1pb.

2 data tables
Table 1

The cross section times acceptance.

Table 2

No description provided.


Subthreshold production of energetic pi- in relativistic Ne + NaF and Ni + Ni collisions

Gillitzer, A. ; Gilg, H. ; Handlos, M. ; et al.
Z.Phys.A 354 (1996) 3-4, 1996.
Inspire Record 429643 DOI 10.17182/hepdata.16504

The production of energetic π− at 0° has been measured in Ne+NaF and Ni+Ni collisions with incident energies between 1.3 and 2AGeV. In Ne+NaF collisions the investigation was extended to extreme subthreshold processes with lab momenta up to 4.5 GeV/c. In both systems at all incident energies the π− production cross sections deviate in a systematic way from thermal distributions.

2 data tables
Table 1

No description provided.

Table 2

Nucleus is NA F.


Precise pion electroproduction in the p (e, e-prime pi+) n reaction at W = 1125-MeV

Blomqvist, K.I. ; Boeglin, W.U. ; Böhm, R. ; et al.
Z.Phys.A 353 (1996) 415-421, 1996.
Inspire Record 428951 DOI 10.17182/hepdata.16502

The reactione+p →> e+π++n at c.m. energyW=1125MeV and momentum transfer Q2=0.117GeV2/c2 has been measured. The transverse and longitudinal structure functions have been separated by varying the polarization of the virtual photon (Rosenbluth plot) with a 3 to 4% error. In addition the longitudinal-transverse interference term has been determined measuring the right-left asymmetry with an accuracy of 3%. The experimental data are compared to model calculations, and the sensitivity of the results to the axial and pion formfactors is discussed.

6 data tables
Table 1

Angle PHI(P=4) is the angle between the scattering plane (defined by 1 and 3 particles) and the reaction plane (defined by 4 and 5 particles).

Table 2

Angle PHI(P=4) is the angle between the scattering plane (defined by 1 and 3 particles) and the reaction plane (defined by 4 and 5 particles).

Table 3

Angle PHI(P=4) is the angle between the scattering plane (defined by 1 and 3 particles) and the reaction plane (defined by 4 and 5 particles).

More…

Production of SIGMA0 and OMEGA- in Z decays

The DELPHI collaboration Adam, W. ; Adye, T. ; Agasi, E. ; et al.
Z.Phys.C 70 (1996) 371-382, 1996.
Inspire Record 416098 DOI 10.17182/hepdata.47799

None

3 data tables
Table 1

Statistical error only.

Table 2

No description provided.

Table 3

No description provided.


Charged particle multiplicity in e+ e-interactions at s**(1/2) = 130-GeV

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett.B 372 (1996) 172-180, 1996.
Inspire Record 415744 DOI 10.17182/hepdata.47831

From the data collected by DELPHI at LEP in autumn 1995, the multiplicity of charged particles at a hadronic energy of 130 GeV has been measured to be 〈 n ch 〉 = 23.84 ± 0.51 (stat) ± 0.52 (syst). When compared to lower energy data, the value measured is consistent with the evolution predicted by QCD with corrections at next-to-leading order, for a value α s (130 GeV) = 0.105 ± 0.003 (stat) ± 0.008 (syst).

1 data table
Table 1

No description provided.


Determination of sin**2 theta(w)(eff) using jet charge measurements in hadronic Z decays

The ALEPH collaboration Buskulic, D. ; De Bonis, I. ; Decamp, D. ; et al.
Z.Phys.C 71 (1996) 357-378, 1996.
Inspire Record 416137 DOI 10.17182/hepdata.47832

None

1 data table
Table 1

The first sytematic error is due to the experimental uncertainties, whilst the second is due to the uncertainties in the quark charge separations.