HEPData Search

This paper presents measurements of the inclusive production cross sections of Λ baryons in e+e− annihilations at s=29 GeV. The data sample corresponds to an integrated luminosity of 256 pb−1 collected with the High-Resolution Spectrometer at the SLAC storage ring PEP. Comparisons are made to the predictions of the Lund model. The data are well described with use of a strange-diquark suppression parameter, (usud)(sd), of 0.89 ± 0.10−0.16+0.56, and the measured Λc→Λ+X branching ratio of (23 ± 10)%.

3 data tables

Table 1

No description provided.

Table 2

Rapidity relative to thrust axis.

Table 3

Corrected for unobserved moment regions.

$\Lambda$ and $\bar{\Lambda}$ Polarization in $K^\pm p$ Interactions at 32-{GeV}/$c$

The French-Soviet & CERN-Soviet collaborations Faccini-Turluer, M.L. ; Barloutaud, R. ; Cochet, C. ; et al.

Z.Phys.C 1 (1979) 19, 1979.

Inspire Record 132913 DOI 10.17182/hepdata.19291

Data on Λ and$\bar \Lambda $ polarization inK±p interactions at 32 GeV/c are presented. A comparison is made between the results of these two experiments as well as with the data at lower energies. The contribution of the different production mechanisms to the Λ($\bar \Lambda $) polarization are discussed.

2 data tables

Table 1

Data are presented on figures only. DATA NOT ENCODED.

Table 2

No description provided.

$\pi^{-}$C collisions with backward proton emission at 4 and 40 GeV/c

Angelov, N. ; Lutpullaev, S.L. ; Nikitina, V.F. ; et al.

Sov.J.Nucl.Phys. 33 (1981) 98-99, 1981.

Inspire Record 1392857 DOI 10.17182/hepdata.17814

None

13 data tables

Table 1

PROTONS MOMENTA LIE IN LAB BACKWARD HEMISPHERE.

Table 2

No description provided.

Table 3

No description provided.

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$\rho^0$ and $\omega$ Meson Inclusive Production by 70-{GeV}/$c$ Protons on the Be Nuclei.

Antipov, Yu.M. ; Bessubov, V.A. ; Budanov, N.P. ; et al.

Sov.J.Nucl.Phys. 36 (1982) 829, 1982.

Inspire Record 177514 DOI 10.17182/hepdata.41184

None

10 data tables

Table 1

THE RATIO SIG(RHO0)/SIG(OMEGA) IS FREE PARAMETER.

Table 2

THE RATIO SIG(RHO0)/SIG(OMEGA)=1. AND FIXED.

Table 3

No description provided.

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$\rm{J}/\psi$ production at low transverse momentum in p+p and d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

The STAR collaboration Adamczyk, L. ; Adkins, J.K. ; Agakishiev, G. ; et al.

Phys.Rev.C 93 (2016) 064904, 2016.

Inspire Record 1420183 DOI 10.17182/hepdata.73526

We report on the measurement of $\rm{J}/\psi$ production in the dielectron channel at mid-rapidity (|y|<1) in p+p and d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV from the STAR experiment at the Relativistic Heavy Ion Collider. The transverse momentum $p_{T}$ spectra in p+p for $p_{T}$ < 4 GeV/c and d+Au collisions for $p_{T}$ < 3 GeV/c are presented. These measurements extend the STAR coverage for $\rm{J}/\psi$ production in p+p collisions to low $p_{T}$. The $<p_{T}^{2}>$ from the measured $\rm{J}/\psi$ invariant cross section in p+p and d+Au collisions are evaluated and compared to similar measurements at other collision energies. The nuclear modification factor for $\rm{J}/\psi$ is extracted as a function of $p_{T}$ and collision centrality in d+Au and compared to model calculations using the modified nuclear Parton Distribution Function and a final-state $\rm{J}/\psi$ nuclear absorption cross section.

6 data tables

Table 1

The mean square of $p_T$.

Table 2

Nuclear absorption cross section.

Table 3

The nuclear modicifation factor vs. $p_T$ for $J\psi$ with |y| < 1 in 0-100 percent central d+Au collisions.

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$p (^{3}$He, T) Charge Exchange Reaction at 4.4-{GeV}/$c$ - 18.3-{GeV}/$c$ With $\Delta$ Isobar Production

Ableev, V.G. ; Vorobev, G.G. ; Dimitrov, Kh. ; et al.

Sov.J.Nucl.Phys. 46 (1987) 300, 1987.

Inspire Record 235268 DOI 10.17182/hepdata.2438

None

4 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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A Comparison of Hadron Production in $p \bar{p}$ and $p p$ Collisions in the Central Region at $\sqrt{s}=53$-{GeV}

The Axial Field Spectrometer collaboration Akesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.

Nucl.Phys.B 228 (1983) 409-423, 1983.

Inspire Record 190653 DOI 10.17182/hepdata.37131

We have studied the inclusive production of the hadrons π ± , K ± , p, p , Λ, Λ , ρ and ⋉ in the central region at the ISR s = 53 GeV , in both pp and p p collisions. Differences are observed only for K ± , p, and p production. We then study also correlations between low- p T pp and p p pairs in the two types of collisions, separating the contribution from baryon pair production and from the incident particles (stopping protons). We observe a positive correlation between two stopping protons; between the production of two pairs, and between a stopping proton and a pair production, there are negative correlations.

1 data table

Table 1

No description provided.

A Determination of alpha-s (M (Z0)) at LEP using resummed QCD calculations

The OPAL collaboration Acton, P.D. ; Alexander, G. ; Allison, John ; et al.

Z.Phys.C 59 (1993) 1-20, 1993.

Inspire Record 354188 DOI 10.17182/hepdata.14427

The strong coupling constant, αs, has been determined in hadronic decays of theZ0 resonance, using measurements of seven observables relating to global event shapes, energy correlatio

7 data tables

Table 1

Data corrected for finite acceptance and resolution of the detector and for intial state photon radiation. No corrections for hadronic effects are applied.. Errors include statistical and systematic uncertainties, added in quadrature.

Table 2

Table 3

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A Direct observation of quark - gluon jet differences at LEP

The OPAL collaboration Alexander, G. ; Allison, J. ; Allport, P.P. ; et al.

Phys.Lett.B 265 (1991) 462-474, 1991.

Inspire Record 316872 DOI 10.17182/hepdata.48454

Quark and gluon jets in e + e − three-jet events at LEP are identified using lepton tagging of quark jets, through observation of semi-leptonic charm and bottom quark decays. Events with a symmetry under transposition of the energies and directions of a quark and gluon jet are selected: these quark and gluon jets have essentially the same energy and event environment and as a consequence their properties can be compared directly. The energy of the jets which are studied is about 24.5 GeV. In the cores of the jets, gluon jets are found to yield a softer particle energy spectrum than quark jets. Gluon jets are observed to be broader than quark jets, as seen from the shape of their particle momentum spectra both in and out of the three-jet event plane. The greater width of gluon jets relative to quark jets is also visible from the shapes of their multiplicity distributions. Little difference is observed, however, between the mean value of particle multiplicity for the two jet types.

1 data table

Table 1

QUARK means QUARK or QUARKBAR.

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CM Energies (GeV)

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$J/\psi$ and $\psi^\prime$ Production in $\pi^-$ Cu Interaction at 50-{GeV}/$c$

rivet Analysis
$\Lambda$ Production in $e^+ e^-$ Annihilations at 29-{GeV}: A Comparison With Lund Model Predictions

$\Lambda$ and $\bar{\Lambda}$ Polarization in $K^\pm p$ Interactions at 32-{GeV}/$c$

$\pi^{-}$C collisions with backward proton emission at 4 and 40 GeV/c

$\rho^0$ and $\omega$ Meson Inclusive Production by 70-{GeV}/$c$ Protons on the Be Nuclei.

$\rm{J}/\psi$ production at low transverse momentum in p+p and d+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV

$p (^{3}$He, T) Charge Exchange Reaction at 4.4-{GeV}/$c$ - 18.3-{GeV}/$c$ With $\Delta$ Isobar Production

A Comparison of Hadron Production in $p \bar{p}$ and $p p$ Collisions in the Central Region at $\sqrt{s}=53$-{GeV}

A Determination of alpha-s (M (Z0)) at LEP using resummed QCD calculations

A Direct observation of quark - gluon jet differences at LEP