HEPData Search

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Transverse momentum distributions of J/psi, psi', Drell-Yan and continuum dimuons produced in Pb Pb interactions at the SPS.

The NA50 collaboration Abreu, M.C ; Alessandro, B ; Alexa, C ; et al.

Phys.Lett.B 499 (2001) 85-96, 2001.

Inspire Record 537484 DOI 10.17182/hepdata.57431

Muon pairs produced in Pb–Pb interactions at 158 GeV/ c per nucleon are used to study the transverse momentum distributions of the J/ ψ , ψ ′ and dimuons in the mass continuum. In particular, the dependence of these distributions on the centrality of the Pb–Pb collision is investigated in detail.

9 data tables

Table 1

Mean values of PT and PT**2 calculated from the IMR distributions.

Table 2

Mean values of PT and PT**2 calculated from the J/PSI distributions.

Table 3

Mean values of PT and PT**2 calculated from the PSI(3685) distributions.

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Measurement of the t distribution in diffractive photoproduction at HERA.

The ZEUS collaboration Breitweg, J. ; Derrick, M. ; Krakauer, D. ; et al.

Eur.Phys.J.C 2 (1998) 237-246, 1998.

Inspire Record 452355 DOI 10.17182/hepdata.44323

Photon diffractive dissociation, $\gamma p \to Xp$, has been studied at HERA with the ZEUS detector using $ep$ interactions where the virtuality $Q^2$ of the exchanged photon is smaller than 0.02 GeV$^2$. The squared four-momentum $t$ exchanged at the proton vertex was determined in the range $0.073<|t|<0.40$ GeV$^2$ by measuring the scattered proton in the ZEUS Leading Proton Spectrometer. In the photon-proton centre-of-mass energy interval $176<W<225$ GeV and for masses of the dissociated photon system $4<M_X<32$ GeV, the $t$ distribution has an exponential shape, $dN/d|t| \propto \exp{(-b|t|)}$, with a slope parameter $b=6.8 \pm 0.9$~(stat.)~$ ^{+1.2}_{-1.1}$~(syst.)~GeV$^{-2}$.

2 data tables

Table 1

T is the squared four momentum transfer at the proton vertex.

Table 2

SLOPE of the DN/DT distribution.

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.

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