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EXPERIMENTAL ANALYSIS OF THE PROPERTIES OF THE FIVE PION EFFECT OBSERVED IN ANTI-P P INTERACTIONS NEAR 1950-MEV/C**2

Espigat, P. ; Defoix, C. ; Dobrzynski, L. ; et al.
Nucl.Phys.B 162 (1980) 41-60, 1980.
Inspire Record 157037 DOI 10.17182/hepdata.34583

The properties of the effect observed in the reaction p p → π + π − π + π − π 0 at 1949 ± 10 MeV /c 2 (τ ≅ 80 MeV /c 2 ) are studied. The ω 0 ϱ 0 , A 2 0 π + π − and π + π − π + π − π 0 (non-resonant) channels are found to be coupled with this object. The assignment I G = 1 − is established and an analysis of the √ s behaviour of the density matrix elements for the final state ω 0 ϱ 0 clearly favour J P = 2 + , 4 + … Comparisons are made with present theoretical schemes describing this mass region.

1 data table
Table 1

MAJOR CONTRIBUTION TO STRUCTURE OBSERVED AT 1949 +- 10 MEV WITH WIDTH 80 +- 20 MEV.


Measurement on $\pi^+ \pi^- \pi^0 \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^0 \pi^0$, $\pi^+ \pi^- \pi^+ \pi^- \pi^+ \pi^-$ Production Cross-sections in $e^+ e^-$ Annihilation at 1.45-{GeV} - 1.80-{GeV} Center-of-mass Energy

Esposito, B. ; Marini, A. ; Piano Mortari, Giovanni ; et al.
Lett.Nuovo Cim. 31 (1981) 445-452, 1981.
Inspire Record 170489 DOI 10.17182/hepdata.37329

None

3 data tables
Table 1

No description provided.

Table 2

CROSS SECTIONS FOR POSITIVE AND NEGATIVE G-PARITY FINAL STATES (EVEN AND ODD NUMBERS OF PIONS).

Table 3

No description provided.


rivet Analysis
Observation of a New Isoscalar Vector Meson in $e^+ e^- \to \omega \pi^+ \pi^-$ Annihilation at 1.65-{GeV}

Cordier, A. ; Bisello, D. ; Bizot, J.C. ; et al.
Phys.Lett.B 106 (1981) 155-158, 1981.
Inspire Record 166964 DOI 10.17182/hepdata.31042

The e + e − → ωπ + π − → π + π − π + π − π 0 cross section has been measured at DCI by the DMI experiment in the 1.4–2.2 GeV energy range. A bump in this cross section appears at 1.65 GeV above a small background, with 6.2 s.d. statistical significance. It can be interpreted as a new isoscalar vector meson: ω ′ or ø ′.

1 data table
Table 1

THE INDIVIDUAL SYSTEMATIC ERRORS ARISE FROM THE UNCERTAINTY IN SUBTRACTING THE FIVE-PION (NON-OMEGA) BACKGROUND. THESE ERRORS ARE CORRELATED WITH THE STATISTICAL ERRORS.


MEASUREMENT OF THE RATIO sigma (W ---> e neutrino) / sigma (Z ---> e e) IN anti-p p COLLISIONS AT S**(1/2) = 1.8-TeV

The CDF collaboration Abe, F. ; Amidei, Dante E. ; Apollinari, G. ; et al.
Phys.Rev.Lett. 64 (1990) 152-156, 1990.
Inspire Record 285490 DOI 10.17182/hepdata.19969

An analysis of W- and Z-boson production using data from the Collider Detector at Fermilab at √s =1.8 TeV yields σ(W→ev)/σ(Z→ee)=10.2±0.8(stat)±0.4(syst). The width of the W boson, Γ(W), and a limit on the top-quark mass independent of decay mode are extracted from this measurement.

1 data table
Table 1

No description provided.


rivet Analysis
Study of the Reaction $e^+ e^- \to K^+ K^-$ in the Energy Range 1350 $\le \sqrt{s} \le$ 2400-{MeV}

The DM2 collaboration Bisello, D. ; Busetto, G. ; Castro, A. ; et al.
Z.Phys.C 39 (1988) 13, 1988.
Inspire Record 262690 DOI 10.17182/hepdata.15622

Thee+e−→K+K− cross section has been measured from about 750 events in the energy interval\(1350 \leqq \sqrt s\leqq 2400 MeV\) with the DM2 detector at DCI. TheK± form factor |FF±| cannot be explained by the ρ, ω, ϕ and ρ′(1600). An additional resonant amplitude at 1650 MeV has to be added as suggested by a previous experiment.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Measurement of b, the Nuclear Slope Parameter of the p anti-p Elastic Scattering Distribution at s**(1/2) = 1800-GeV

The E710 collaboration Amos, N.A. ; Baker, W.F. ; Bertani, M. ; et al.
Phys.Rev.Lett. 61 (1988) 525, 1988.
Inspire Record 261411 DOI 10.17182/hepdata.20066

We have studied proton-antiproton elastic scattering at s=1800 GeV at the Fermilab Collider, in the range 0.02<|t|<0.13 (GeV/c)2. Fitting the distribution by exp(−B|t|), we obtain a value of B of 17.2±1.3 (GeV/c)−2.

2 data tables
Table 1

No description provided.

Table 2

Error contains estimate of systematic effects.


Lambda0 and anti-Lambda0 Production from Proton - anti-Proton Collisions at s**(1/2) = 1.8-TeV

The E735 collaboration Banerjee, S. ; Beery, P.D. ; Biswas, N.N. ; et al.
Phys.Rev.Lett. 62 (1989) 12, 1989.
Inspire Record 24875 DOI 10.17182/hepdata.20125

The transverse-momentum spectra of lambdas (Λ0, Λ¯0) produced in the central region has been measured in p¯p collisions at s=1.8 TeV at the Fermilab Collider. We find that the average transverse momentum of the lambdas increases more rapidly with center-of-mass energy than that of charged particles, and the ratio of lambdas to charged particles increases as a function of center-of-mass energy.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

Measurement of the Inclusive Jet Cross-Section in anti-p p Collisions at s**(1/2) = 1.8-TeV

The CDF collaboration Abe, F. ; Amidei, D. ; Apollinari, G. ; et al.
Phys.Rev.Lett. 62 (1989) 613, 1989.
Inspire Record 267999 DOI 10.17182/hepdata.20032

Inclusive jet production at s=1.8 TeV has been measured in the CDF detector at the Fermilab Tevatron p¯p Collider. Jets with transverse energies (Et) up to 250 GeV have been observed. The Et dependence of the inclusive jet cross section is consistent with leading-order quantum-chromodynamic calculations, and comparison with lower-energy data shows deviations from scaling consistent with QCD. A lower limit of 700 GeV (95% confidence level) is placed on the quark compositeness scale parameter Λc associated with an effective contact interaction.

1 data table
Table 1

No description provided.


A Measurement of W Boson Production in 1.8-TeV anti-p p Collisions

The CDF collaboration Abe, F. ; Amidei, D. ; Apollinari, G. ; et al.
Phys.Rev.Lett. 62 (1989) 1005, 1989.
Inspire Record 267998 DOI 10.17182/hepdata.20078

The cross section for the production and subsequent decay to electron and neutrino of the W intermediate vector boson has been measured in 1.8-TeV p¯p collisions at the Fermilab Tevatron Collider. An analysis of events with missing transverse energy greater than 25 GeV and with an electron of transverse energy greater than 15 GeV from a datum sample of 25.3 nb−1 gives σB=2.6±0.6±0.5 nb.

1 data table
Table 1

Branching ratio to electron and neutrino.


Dijet Angular Distributions from anti-p p Collisions at s**(1/2) = 1.8-TeV

The CDF collaboration Abe, F. ; Amidei, D. ; Apollinari, G. ; et al.
Phys.Rev.Lett. 62 (1989) 3020-3023, 1989.
Inspire Record 278394 DOI 10.17182/hepdata.20046

We have measured dijet angular distributions at √s =1.8 TeV with the Collider Detector at Fermilab and the Tevatron p¯p Collider and find agreement with leading-order QCD. By comparing the distribution for the highest dijet invariant masses with the prediction of a model of quark compositeness, we set a lower limit on the associated scale parameter Λc at 330 GeV (95% C.L.).

1 data table
Table 1

Numerical values read from figure in preprint.