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Measurements of the Phi (rho + omega) ratio in a large kinematic region in p W and S W interactions

The HELIOS/3 collaboration Mazzoni, M.A. ;
Nucl.Phys.A 544 (1992) 623C-626C, 1992.
Inspire Record 343257 DOI 10.17182/hepdata.36665

We present our first results on φ and ϱ+ω production in pW and SW collisions at 200 GeV/nucleon, obtained using the HELIOS/3 muon spectrometer, which measures dimuons in a large acceptance in transverse momentum and rapidity. The data show a clear increase of the ratio φ/(ϱ+ω) going from pW to SW collisions and a slight increase from peripheral to central SW collisions. This the case for low (p t ≤ 0.6GeV/c) and high (p t > 0.6 GeV/c) transverse momentum. The rise is due to an increase in the number of produced φ mesons.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Rapidity and transverse momentum distributions in 6.4-TeV S + Pb interactions from CERN EMU05 experiments. EMU-005 experiment

Iyono, A. ; Takahashi, Y. ; Gregory, J.C. ; et al.
Nucl.Phys.A 544 (1992) 455C-458C, 1992.
Inspire Record 343252 DOI 10.17182/hepdata.36672

Mixed transverse(P T ) momentum and rapidity distributions of charged particles produced in 200 GeV/AMU heavy ion collisions are obtained with Magnetic-Interferometric-Emulsion-Chamber ( MAGIC ) by CERN-EMU05 experiments. The P T spectra at different rapidity regions showed no anomalous enhancement of low P T components over a conventional, single exponential function with slope values ranging from 160 to 200 MeV/c.

1 data table
Table 1

EVENTS SELECTED FOR THE ANALYSIS ARE THOSE WITH CHARGED MULTIPLICITY MORE THAN 400 FOR CENTRAL S+PB COLLISIONS.


Particle production in interactions of 200-GeV/nucleon oxygen and sulfur nuclei in nuclear emulsion

The KLM collaboration Dabrowska, A. ; Holynski, R. ; Jurak, A. ; et al.
Phys.Rev.D 47 (1993) 1751-1761, 1993.
Inspire Record 338512 DOI 10.17182/hepdata.40446

Oxygen and sulfur nuclei with energies of 200 GeV/nucleon have been allowed to interact in nuclear emulsions exposed at CERN. These emulsions have been scanned with a minimum bias so that essentially all the interactions occurring were detected. Nearly 1000 interactions of each projectile have been analyzed. We present results on the multiplicity distributions, the pseudorapidity distributions, and the fragmentation of the projectile and target nuclei. It is shown that the mean number of intranuclear collisions in each interaction, calculated from a superposition model, provides a useful parameter for organizing the data. We conclude that there are no significant deviations even at these energies from models, such as the venus model, describing the interactions as being the superposition of individual nucleon-nucleon collisions.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Angular distribution of the production of symmetric hadron pairs in pi- p collisions at 40-GeV

Volkov, A.A. ; Kostritsky, A.V. ; Abramov, V.V. ; et al.
JETP Lett. 58 (1993) 486-492, 1993.
Inspire Record 346766 DOI 10.17182/hepdata.40644

None

7 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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The Reaction pi+ p ---> p 2 pi+ pi- at a beam momentum of 4.2-GeV/c: Cross-sections for resonance production in the final state

Brovkin, L.Yu. ; Kiselevich, I.L. ; Mikhailichenko, V.I. ; et al.
Sov.J.Nucl.Phys. 55 (1992) 549-553, 1992.
Inspire Record 343896 DOI 10.17182/hepdata.39978

None

2 data tables
Table 1

No description provided.

Table 2

FOR PI- MESON: THETA(RF=LAB)=<75 DEGREE.


Electroproduction of pi0 on the proton near threshold

Welch, T.P. ; Karen, P.H. ; Mitchell, J.H. ; et al.
Phys.Rev.Lett. 69 (1992) 2761-2764, 1992.
Inspire Record 344040 DOI 10.17182/hepdata.19808

The electroproduction of π0 on the proton was measured from 0 to 2.5 MeV above threshold for virtual-photon 4-momenta of -0.05 and -0.1 (GeV/c)2. The sum of the lowest-order contributing multipoles, a0=‖E0+‖2-εL‖L0+‖2, was determined with a precision an order of magnitude better than previously possible. Our results for a0 are consistent with present calculations. Our extracted value for ‖L0+‖2 at the ‘‘photon point’’ is in agreement with recent predictions.

1 data table
Table 1

Joined statistics for two incident electron energy of 300 and 500 MeV.


Determination of anti-proton neutron amplitude from elastic anti-p deuteron scattering at 600-MeV/c

Mahalanabis, J. ;
Z.Phys.A 342 (1992) 101-105, 1992.
Inspire Record 343348 DOI 10.17182/hepdata.16576

The elementary ¯p-neutron amplitude has been obtained from Glauber's model analysis of ¯p-d elastic scattering data at 600 MeV/c, taking into account theD-state component of the deuteron. The results are compared with the ¯p-nucleus analysis and the ¯NN potential model predictions.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Collective excitation of Delta isobar in the charge exchange reactions (Li-7, Be-7) and (H-3, He-3) at a momentum of 3-GeV/c/nucleon

Avramenko, S.A. ; Abdurakhimov, A.U. ; Aksinenko, V.D. ; et al.
JETP Lett. 55 (1992) 707-712, 1992.
Inspire Record 346156 DOI 10.17182/hepdata.16833

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Limit on the anti-d / anti-u asymmetry of the nucleon sea from Drell-Yan production

McGaughey, P.L. ; Moss, J.M. ; Alde, D.M. ; et al.
Phys.Rev.Lett. 69 (1992) 1726-1728, 1992.
Inspire Record 344919 DOI 10.17182/hepdata.19848

We present an analysis of 800-GeV proton-induced Drell-Yan production data from isoscalar targets 2H and C, and from W, which has a large neutron excess. The ratio of cross sections per nucleon, R-σW/σIS, is sensitive to the difference between the d¯(x) and u¯(x) structure functions of the proton. We find that R is close to unity in the range 0.04≤x≤0.27, allowing upper limits to be set on the d¯-u¯ asymmetry. Additionally, the shape of the differential cross section m3 d2σ/dxF dm for 2H at xF≊0 shows no evidence of an asymmetric sea in the proton. We examine the implications of these data for various models of the violation of the Gottfried sum rule in deep-inelastic lepton scattering.

1 data table
Table 1

Upper limit at the 2sigma statistical error level. Mass of MU+ MU- in GeV.


Electron positron pair production in Coulomb collisions of ultrarelativistic sulphur ions with fixed targets

Vane, C.R. ; Datz, S. ; Dittner, P.F. ; et al.
Phys.Rev.Lett. 69 (1992) 1911-1914, 1992.
Inspire Record 343889 DOI 10.17182/hepdata.19818

Angular and momentum distributions have been measured for positrons from electron-positron pairs created in peripheral collisions of 6.4-TeV sulfur ions with fixed targets of Al, Pd, and Au. The data are compared with results of several theoretical treatments. Measured differential cross sections peak at low momentum (≤1 MeV/c), extend significantly to much higher momenta (>17 MeV/c), and concentrate sharply in the forward direction, along the ion-beam axis. Positron yields scale as the square of the target nuclear charge as predicted by theory.

1 data table
Table 1

No description provided.