Braun-Munzinger, P.
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rivet Analysis
Observation of an excited charmed baryon decaying into Xi(c)0 pi+

The CLEO collaboration Gibbons, L. ; Johnson, S.D. ; Kwon, Y. ; et al.
Phys.Rev.Lett. 77 (1996) 810-813, 1996.
Inspire Record 416471 DOI 10.17182/hepdata.47237

Using data recorded by the CLEO II detector at the Cornell Electron Storage Ring, we report the first observation of an excited charmed baryon decaying into Ξc0π+. The state has mass difference M(Ξc0π+)−M(Ξc0) of 174.3±0.5±1.0MeV/c2, and a width of <3.1MeV/c2 (90% confidence level limit). We identify the new state as the Ξc*+, the isospin partner of the recently discovered Ξc*0.

1 data table
Table 1

CONST(NAME=EPS) is the parameter of the Peterson fragmentation function (C.Peterson et al., PR D27, 105 (1983)) D(N)/D(X) = FD(X) = const * (1/X)*1/(1- (1/X)-CONST(NAME=EPS)/(1-X))**2. Charged conjugate states are undestood.


Elastic Electroproduction of $\rh0$ and $J/\Psi$ Mesons at large $Q~2$ at HERA

The H1 collaboration Aid, S. ; Andreev, V. ; Andrieu, B. ; et al.
Nucl.Phys.B 468 (1996) 3-36, 1996.
Inspire Record 416228 DOI 10.17182/hepdata.51967

The total cross sections for the elastic electroproduction of $\rh0$ and $J/\Psi$ mesons for $Q~2$ $>$ 8 GeV$~2$ and $\langle W \rangle \simeq 90$ GeV/c$~2$ are measured at HERA with the H1 detector. The measurements are for an integrated electron$-$proton luminosity of $\simeq$3pb$~{-1}$. The dependences of the total virtual photon$-$proton ($\gamma~* p$) cross sections on $Q~2$, $W$ and the momentum transfer squared to the proton ($t$), and, for the $\rho$, the dependence on the polar decay angle ($\cos \theta~*$), are presented. The $J/\Psi$ : $\rh0$ cross section ratio is determined. The results are discussed in the light of theoretical models and of the interplay of hard and soft physics processes.

20 data tables
Table 1

Overall EP cross section for M(PI+PI-) < 1.5 GEV.

Table 2

Overall EP cross section, taking into account the J/PSI --> LEPTON+ LEPTON - branching fraction 0.12.

Table 3

Integrated EP cross section.

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rivet Analysis
First measurement of f2-prime (1525) production in Z0 hadronic decays

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Phys.Lett.B 379 (1996) 309-318, 1996.
Inspire Record 416741 DOI 10.17182/hepdata.47972

The inclusive production of the f ′ 2 (1525) in hadronic Z 0 decays has been studied in data collected by the DELPHI detector at LEP. The Ring Imaging Cherenkov detectors were important tools in the identification of the decay f ′ 2 (1525) → K + K − . The average number of f ′ 2 (1525) produced per hadronic Z decay, 〈f′ 2 〉 = 0.020 ± 0.005 (stat) ± 0.006 (syst), and the momentum distribution of the f ′ 2 (1525) have both been measured. The mass and width of the f ′ 2 (1525) are found to be 〈M f′ 2 〉 = 1535 ± 5 (stat) ± 4 (syst) MeV/c 2 , (T f′ 2 ;) = 60 ± 20 (stat) ± 19 (syst) MeV/c 2

2 data tables
Table 1

SIG in (1/SIG) is the total hadronic cross section.

Table 2

No description provided.


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).

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High multiplicity lead-lead interactions at 158-GeV/c per nucleon

Deines-Jones, P. ; Cherry, M.L. ; Dabrowska, A. ; et al.
Phys.Rev.C 53 (1996) 3044-3050, 1996.
Inspire Record 429747 DOI 10.17182/hepdata.25806

The Krakow-Louisiana-Minnesota-Moscow Collaboration (KLMM) has exposed a set of emulsion chambers with lead targets to a 158 GeV/c per nucleon beam of Pb208 nuclei, and we report the initial analysis of 40 high-multiplicity Pb-Pb collisions. To test the validity of the superposition model of nucleus-nucleus interactions in this new regime, we compare the shapes of the pseudorapidity distributions with FRITIOF Monte Carlo model calculations, and find close agreement for even the most central events. We characterize head-on collisions as having a mean multiplicity of 1550±120 and a peak pseudorapidity density of 390±30. These estimates are significantly lower than our FRITIOF calculations. © 1996 The American Physical Society.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Measurement of pi+ p (polarized) analyzing power at 68.3-MeV

Wieser, R. ; Denig, A. ; von Hagel, U. ; et al.
Phys.Rev.C 54 (1996) 1930-1934, 1996.
Inspire Record 429106 DOI 10.17182/hepdata.25768

The analyzing power Ay for π+p→ scattering at 68.3 MeV has been measured at the Paul Scherrer Institut with the magnetic spectrometer LEPS. The measurements cover the angular range 40°≤θlab≤70°. The protons have been polarized in a butanol target, operated in frozen spin mode. The S31 phase shift comes out by about 1° smaller than the Koch-Pietarinen [Nucl. Phys. A 336, 331 (1980)] phase shift analysis, supporting the necessity of an alternative dispersion analysis of πN scattering to determine the σ term and the πN coupling constant. © 1996 The American Physical Society.

1 data table
Table 1

The two data sets correspond to measurements with two different target compositions (see text).


Search for new phenomena using single photon events in the DELPHI detector at LEP

The DELPHI collaboration Abreu, P. ; Adam, W. ; Adye, T. ; et al.
Z.Phys.C 74 (1997) 577-586, 1997.
Inspire Record 415746 DOI 10.17182/hepdata.41128

Data are presented on the reaction e+e− → γ + no other detected particle at centre-of-mass energies of 89.48, 91.26 and 93.08 GeV. The cross-section for this reaction is related directly to the number of light neutrino generations which couple to the Z° boson, and to several other possible phenomena such as the production of excited neutrinos, the production of any invisible ‘X’ particle, and the magnetic moment of the tau neutrino. Based on the observed number of single photon events, the number of light neutrinos that couple to the Z° is measured to be Nv = 2.89 ± 0.38. No evidence is found for anomalous production of energetic single photons, and upper limits at 95% confidence level are determined for excited neutrino production (BR < 4 − 8 × 10−6 depending on its mass), production of an invisible ‘X’ particle (σ, < 0.1 pb for masses below 60 GeV), and the magnetic moment of the tau neutrino (< 5.1 × 10-6 μB).

3 data tables
Table 1

No description provided.

Table 2

Limit on an anomalous magnetic moment for tau-neutrino from '1GAMMA + nothing' events. Magnetic moment in Bohr magnetons.

Table 3

Here UNSPEC is invisible particle.


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.


rivet Analysis
Measurement of the total e+ e- ---> hadrons cross-section near the e+ e- ---> N anti-N threshold

The FENICE collaboration Antonelli, A. ; Baldini, R. ; Bertani, M. ; et al.
Phys.Lett.B 365 (1996) 427-430, 1996.
Inspire Record 426675 DOI 10.17182/hepdata.37900

A new measurement of the total e + e − → hadrons cross-section in the centre of mass energy range 1.8-2.5 GeV, performed by the FENICE experiment at the Frascati e + e − storage ring ADONE, is presented. The behaviour of the total cross section together with the proton electromagnetic time-like form factor is discussed in terms of a narrow vector resonance close to the nucleon-antinucleon threshold.

1 data table
Table 1

Only statistical errors are quoted.


Hadron yields and hadron spectra from the NA49 experiment

The NA49 collaboration Jones, P.G. ; Afanasiev, S.V. ; Alber, T. ; et al.
Nucl.Phys.A 610 (1996) 188C-199C, 1996.
Inspire Record 432742 DOI 10.17182/hepdata.36468

Preliminary inclusive spectra of negative hadrons, net protons and neutral strange particles are presented, measured by the NA49 experiment in central Pb+Pb collisions at 158 GeV per nucleon. Comparison of their yields with those from the lighter S+S system suggests that the yields scale approximately with the number of participating nucleons.

4 data tables
Table 1

CENTRAL COLLISIONS, PRELIMINARY DATA.

Table 2

CENTRAL COLLISIONS, PRELIMINARY DATA.

Table 3

CENTRAL COLLISIONS, PRELIMINARY DATA.

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