Date

Measurement of the anti-p p Total Cross-Section at s**(1/2) = 1.8-TeV

The E710 collaboration Amos, Norman A. ; Avila, C. ; Baker, W.F. ; et al.
Phys.Rev.Lett. 63 (1989) 2784, 1989.
Inspire Record 281851 DOI 10.17182/hepdata.19995

We have measured the antiproton-proton total cross section at √s =1.8 TeV at the Fermilab Tevatron Collider; the value obtained is 78.3±5.9 mb. B, the nuclear slope parameter for elastic scattering, was measured to be 16.3±0.5 (GeV/c)−2. From these data, we derive a value for the total elastic cross section.

4 data tables

Nuclear Store Parameter.

Total cross section measurement. Errors contain systematic effects folded including a 15 PCT error in luminosity measurement which dominates the error.

Total cross section assuming RHO = 0.145 (low energy fit). If RHO is taken as 0.24 obtained by UA4 at sqrt(s) = 546 GeV, the value of SIG is reduced by 1.8 PCT.

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Initial Measurements of Z Boson Resonance Parameters in e+ e- Annihilation

Abrams, G.S. ; Adolphsen, Chris ; Aleksan, R. ; et al.
Phys.Rev.Lett. 63 (1989) 724, 1989.
Inspire Record 280007 DOI 10.17182/hepdata.20034

We have measured the mass of the Z boson to be 91.11±0.23 GeV/c2, and its width to be 1.61−0.43+0.60 GeV. If we constrain the visible width to its standard-model value, we find the partial width to invisible decay modes to be 0.62±0.23 GeV, corresponding to 3.8±1.4 neutrino species.

1 data table

Data now superceded.


MEASUREMENTS OF THE CROSS-SECTION FOR e+ e- ---> gamma gamma at TRISTAN

The AMY collaboration Kim, H.J. ; Kang, J.S. ; Lee, M.H. ; et al.
KEK-Preprint-89-52, 1989.
Inspire Record 280029 DOI 10.17182/hepdata.38418

None

1 data table

No description provided.


Measurement of the $\phi \phi$ Cross-section in $p \bar{p}$ Annihilations at $e$({CM}) Approximately 3-{GeV}

The R704 collaboration Baglin, C. ; Baird, S. ; Bassompierre, G. ; et al.
Phys.Lett.B 231 (1989) 557-562, 1989.
Inspire Record 281268 DOI 10.17182/hepdata.29756

In an experiment performed at the CERN Intersecting Storage Rings as a part of an energy scan to detect the η c formation in p p annihilation, we studied the reaction p p →φφ→ K + K − K + K − . The total cross section has been determined to be 25.0± 7.4±3.8 nb.

1 data table

No description provided.


A Study of the Centrally Produced $K^*0 \bar{K}^*$0 Final State in the Reaction $p p \to p$(f) ($K^+ K^- \pi^+ \pi^-$) $p(s$) at 300-{GeV}/$c$

The WA76 collaboration Armstrong, T.A. ; Benayoun, M. ; Beusch, W. ; et al.
Z.Phys.C 46 (1990) 405-410, 1990.
Inspire Record 287163 DOI 10.17182/hepdata.15199

The reactionpp→pf(K+K-π+π-)ps, where theK+K− π+π- system is centrally produced, has been studied at 300 GeV/c. TheK*0\(K^{*0} \bar K^{*0} \) final state has been observed and the cross sections for its central production are found to be the same at 300 and 85 GeV/c. TheK*0\(K^{*0} \bar K^{*0} \) final state appears to be produced as a non-resonant threshold enhancement.

2 data tables

No description provided.

Cross sections for centrally produced vector-vector final states with mass greater than the phi-phi production threshold.


Electroweak Parameters From a High Statistics Neutrino Nucleon Scattering Experiment

Blondel, A. ; Bockmann, P. ; Burkhardt, .H. ; et al.
Z.Phys.C 45 (1990) 361-379, 1990.
Inspire Record 287166 DOI 10.17182/hepdata.15282

The final results from the WA 1/2 neutrino experiment in the 1984 CERN 160 GeV narrow band beam are presented. The ratiosRν and\(R_{\bar v} \) of neutral to charged current interaction rates of neutrinos and antineutrinos in iron are measured to beRν=0.3072±0.0033 and\(R_{\bar v} \)=0.382±0.016. A value of the electroweak parameter sin2 θw = 1 −mW2/mZ2 is extracted fromRν. The result is sin2 θw =0.228+0.013(mc−1.5)±0.0003 (theor.) wheremc is the mass of the charmed quark in GeV formt=60 GeV,MH=100 GeV, ρ=1. CombiningRν and\(R_{\bar v} \) one obtains a value for ρ=0.991+0.023(mc−1.5)±0.020(exp.). Alternatively,Rν and\(R_{\bar v} \) yield a precise value of the ratio of intermediate vector boson massesmW/mZ=0.880−0.007(mc−1.5)±0.002(exp.)±0.002(theor.). Comparison of these results with those from direct measurements of the vector boson masses are presented. In a model-independent analysis the left- and right-handed neutral current coupling constants,gL2 andgR2, are determined.

3 data tables

No description provided.

No description provided.

No description provided.


Measurement of the Differential Cross-sections of $e^+ e^- \to \gamma \gamma$ and $e^+ e^- \to \gamma \gamma \gamma$ at $\sqrt{s}=55$-{GeV}, 56-{GeV}, 56.5-{GeV} and 57-{GeV} and Search for Unstable Photino Pair Production

The VENUS collaboration Abe, K. ; Amako, K. ; Arai, Y. ; et al.
Z.Phys.C 45 (1989) 175, 1989.
Inspire Record 280669 DOI 10.17182/hepdata.15298

Differential cross sections fore+e−→γγ have been measured at center-of-mass energies of 55, 56, 56.5 and 57 GeV. The results are in good agreement with those predicted by QED. Possible deviations from QED are studied in terms of contact interactions, and the limits on compositeness scales are obtained. Using events with a gramma pair in the final state, a search is made for the pair production of unstable photons,\(e^ +e^ -\to \tilde \gamma\tilde \gamma \). No candidate events were found and a new limit on the photino mass is obtained.

11 data tables

No description provided.

No description provided.

No description provided.

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Resonance Decomposition of the $D^*$0 (2420) Through a Decay Angular Analysis

The ARGUS collaboration Albrecht, H. ; Glaser, R. ; Harder, G. ; et al.
Phys.Lett.B 232 (1989) 398-404, 1989.
Inspire Record 280943 DOI 10.17182/hepdata.45198

Using data collected with the ARGUS detector, we have performed a decay angular analysis of the enhancement, previously known as the D ∗ (2420), seen in the final state D ∗ (2010) + π − . We thereby exhibit that the observed broad structure is actually due to two relatively narrow resonances, one of which is identified as the D ∗ (2459) 0 , while the massof the other is measured to be (2414±2±5) MeV/ c 2 . The results of the analysis are in good agreement with the interpretation of the two states as L =1 D mesons of spin-parities 2 + and 1 + respectively.

2 data tables

The cross sections times branching ratio.

It is assumed that decays D PION and D* PION saturate the total widths.


QUARK HADRONIZATION PROBED BY K0 MESONS

The HRS collaboration Abachi, S. ; Derrick, M. ; Kooijman, P. ; et al.
Phys.Rev.D 41 (1990) 2045, 1990.
Inspire Record 280958 DOI 10.17182/hepdata.23000

Total and differential K0 corss sections are presented from e+e− collisions at s=29 GeV in the High Resolution Spectrometer detector. K0 and charged-particle distributions are compared in a study of the hadronization of quarks of known flavor. Ecents of the reaction e+e−→cc¯ are tagged by identifying D*'s while uu¯, dd¯, or ss¯ events are tagged through the identification of a charged particle with fractional momentum near 1. Parton-shower models with cluster and string fragmentation are compared with these data. Also, certain particle scaling tests are performed using the quark-flavor tags. In addition, K0 production in two- and three-jet events is compared to these models.

6 data tables

Corrected Cross Sections (Lund MC used to extrapolate).

R value for K0 production.

K0 differential cross section as function of the fractional energy.

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A MEASUREMENT OF e+ e- ---> b anti-b FORWARD - BACKWARD CHARGE ASYMMETRY BETWEEN s**(1/2) = 52-GeV AND 57-GeV

The AMY collaboration Sagawa, H. ; Lim, J. ; Abe, K. ; et al.
Phys.Rev.Lett. 63 (1989) 2341, 1989.
Inspire Record 279824 DOI 10.17182/hepdata.19996

Using 123 multihadronic inclusive muon-production e+e− annihilation events at an average c.m. energy of 55.2 GeV, we extracted the forward-backward charge asymmetry of the e+e−→bb¯ process and the R ratio for bb¯ production. We used an analysis method in which the behavior of the c quark and lighter quarks is assumed, with only that of the b quark left indeterminate. The results, Ab=-0.72±0.28(stat)±0.13(syst) and Rb=0.57±0.16±0.10, are consistent with the standard model.

2 data tables

Asymmetry in BOTTOM quark production.

Ratio of BOTTOM quark production to total hadron cross section (R value).