The correlations between charged particle multiplicities produced in forward and backward pseudorapidity regions in p $($) over bar$$ p interactions have been measured with a 240 element scintillator hodoscope. The correlation coefficient and the variance of the difference of multiplicities in the two pseudorapidity regions were determined for root s = 0.3-1.8 TeV. These results have been interpreted in terms of a cluster model of particle production.

Fermilab experiment E735 located at the CO intersection region of the <img src="/fulltext-image.asp?format=htmlnonpaginated&src=X754331UN2103624_html\10052_2005_Article_BF01624584_TeX2GIFIE3.gif" border="0" alt=" $$\sqrt s = 1.8$$ " /> TeV <img src="/fulltext-image.asp?format=htmlnonpaginated&src=X754331UN2103624_html\10052_2005_Article_BF01624584_TeX2GIFIE4.gif" border="0" alt=" $$p\bar p$$ " /> collider analysed over 900 Φ→K+K− events. Measured were the transverse momentum spectrum, the correlation between the average transverse momentum pt> and the charged particle multiphcityNc, as well as the probability of Φ production per charged track,NΦ/Nc, versusNc. We have also made an estinate of the total inclusive cross section for Φ mesons, <img src="/fulltext-image.asp?format=htmlnonpaginated&src=X754331UN2103624_html\10052_2005_Article_BF01624584_TeX2GIFIE5.gif" border="0" alt=" $$\sigma (p\bar p \to \phi X) = 7.3 \pm 2.2 mb$$ " />.

Fermilab experiment E735 located at the CO intersection region of the\(\sqrt s = 1.8\) TeV\(p\bar p\) collider analysed over 900 Φ→K+K− events. Measured were the transverse momentum spectrum, the correlation between the average transverse momentum and the charged particle multiphcityN c , as well as the probability of Φ production per charged track,N Φ /N c , versusN c . We have also made an estinate of the total inclusive cross section for Φ mesons,\(\sigma (p\bar p \to \phi X) = 7.3 \pm 2.2 mb\).

The correlations between charged particle multiplicitie produced in forward and backward pseudorapidity regions in pp̄ interactions have been measured with a 240 element scintillator hodoscope. The correlation coefficient and the variance of the difference of multiplicities in the two pseudorapidity regions were deterermined for s=0.3−1.8 TeV. These results have been interpreted in terms of a cluster model of particle production.

Transverse momentum spectra of charged particles produced within the pseudo-rapidity range of η= − 0.36 to + 1.0 have been measured in pp collisions at √s=0.3, 0.54, 1.0, and 1.8 TeV. The spectra are presented as a function of event charged multiplicity within the range −3.25<η<3.25. We found that the slope in the low pt region is independent of center-of-mass energy and multiplicity while the slope at the high pt region shows a strong energy and multiplicity dependence.

Preliminary results on photon production and forward-backward multiplicity correlations in pp collisions at √s = 1.8 TeV are presented. Some additional results obtained at lower energies are also shown.

The yields and average transverse momenta of pions, kaons, and antiprotons produced at the Fermilab ppBAR collider at square-root s = 300, 540, 1000, and 1800 GeV are presented and compared with data from the energies reached at the CERN collider. We also present data on the dependence of average transverse momentum [p(t)] and particle ratios as a function of charged particle density dN(c)/deta; data for particle densities as high as six times the average value, corresponding to a Bjorken energy density 6 GeV/fm3, are reported. These data are relevant to the search for quark-gluon phase of QCD.

We report a measurement of the inclusive production of low-energy photons from ppBAR collisions at square-root s = 1.8 TeV. A NaI calorimeter located near eta = 0 was used to measure the photon transverse momentum spectrum over the range 30 less-than-or-equal-to p(t) less-than-or-equal-to 5000 MeV/c. The data are compared to the photon production expected from known particle decays in an attempt to isolate a low-energy direct photon signal. We find no evidence for excess photons above those expected from hadron decays and place an upper limit of 16% (90% C.L.) on any excess direct photons in the p(t) range from 30 to 100 MeV/c.

The production properties of lambdas ({Lambda}{sup 0},{bar {Lambda}} {sup 0}) and cascades ({Xi}{sup {minus}},{bar {Xi}} {sup {minus}}) in the central region in {ital {bar p}p} collisions at {radical}{ital s} =1.8 TeV at the Fermilab collider are reported. The transverse-momentum spectra of lambdas are measured as a function of multiplicity and the ratios of lambdas to protons ({ital p},{ital {bar p}}) and to all charged particles are studied as a function of transverse momentum and multiplicity. Moreover the average transverse momentum of cascades and the ratio of cascades to lambdas are presented.

The production properties of lambdas (Λ0,¯Λ0) and cascades (Ξ−,¯Ξ−) in the central region in ¯pp collisions at √s=1.8 TeV at the Fermilab collider are reported. The transverse-momentum spectra of lambdas are measured as a function of multiplicity and the ratios of lambdas to protons (p,¯p) and to all charged particles are studied as a function of transverse momentum and multiplicity. Moreover the average transverse momentum of cascades and the ratio of cascades to lambdas are presented.Received 7 November 1991DOI:https://doi.org/10.1103/PhysRevD.46.2773©1992 American Physical Society