Hall, J.
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A PRECISION MEASUREMENT OF POLARIZATION PARAMETERS FOR THE PI+ + P ---> K+ + SIGMA+ REACTION AT 13 LABORATORY MOMENTA BETWEEN 1490-MEV/C AND 2069-MEV/C

Haba, J. ; Homma, T. ; Kawai, H. ; et al.
Nucl.Phys.B 299 (1988) 627-639, 1988.
Inspire Record 269585 DOI 10.17182/hepdata.33363

The polarization parameters for the π + +p→K + +∑ + reaction have been measured at 13 laboratory momenta between 1490 and 2069 MeV/ c in the angular range of −0.1⩽ cos θ K ∗ ⩽0.7 with higher statistics than previous experiments. In general, the present results agree well with the results at the Rutherford Appleton Laboratory. It is found, however, that there exist small but systematic differences which can be attributed to certain coefficients in Legendre expansions. The physical significance of these differences is discussed.

2 data tables
Table 1

ALPHA0 is the decay asymmetry parameter (=0.980 +- 0.015 PDG tables).

Table 2

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.


ELECTROPRODUCTION OF SINGLE CHARGED PIONS FROM DEUTERIUM AT Q**2 APPROXIMATELY 1-GEV**2 IN THE RESONANCE REGION

Vapenikova, O. ; Allison, John ; Dickinson, B. ; et al.
Z.Phys.C 37 (1988) 251-258, 1988.
Inspire Record 263398 DOI 10.17182/hepdata.898

We present differential cross-sections for the electro-production of single charged pions from deuterium for a virtual photon mass squared −1.0 GeV2 and for pion nucleon masses in the range 1.23–1.68 GeV (the 1st and 2nd resonance regions). The data are compared with predictions from fits to hydrogen data.

30 data tables
Table 1

FORWARD BINS.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of the imaginary part of the I=1 $\bar{N} N$ S‐wave scattering length

Mutchler, G.S. ; Clement, J. ; Kruk, J. ; et al.
Phys.Rev.D 38 (1988) 742-753, 1988.
Inspire Record 268866 DOI 10.17182/hepdata.23244

The survival time spectrum of slow antineutrons produced in a LH2 target has been measured. From these data the imaginary part of the I=1 spin averaged S‐wave antineutron proton scattering length has been deduced to be Im a1= −0.83±0.07 fm. The result lies within the range of values calculated from current potential models.

1 data table
Table 1

THE VALUE AT PLAB = 0. HAVE BEEN OBTAINED BY EXTRAPOLATION.


Measurement of Pion Proton Bremsstrahlung for Pions at 299-{MeV}

Meyer, C.A. ; Amsler, Claude ; Bosshard, A. ; et al.
Phys.Rev.D 38 (1988) 754-767, 1988.
Inspire Record 268867 DOI 10.17182/hepdata.23271

We have measured the fivefold differential cross section d5σ/dΩπdΩγdEγ for the process π+p→π+pγ with incident pions of energy 299 MeV. The angular regions for the outgoing pions (55°≤θlabπ≤95°), and photons (θlabγ=241°±10°) in coplanar geometry are selected to maximize the sensitivity to the radiation from the magnetic dipole moment of the Δ++(1232) resonance. At low photon energies, the data agree with the soft-photon approximation to pion-proton bremsstrahlung. At forward pion angles the data agree with older data and with the latest theoretical calculations for 2.3μp≤μΔ≤3.3μp. However at more backward pion angles where no data existed, the predictions fail.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Search for Narrow Peaks in Inclusive $\pi^0$ Spectra From $\bar{p} p$ Annihilation at Rest

The Fukui-Tokyo-KEK-Kyoto Sangyo-Osaka-Tokyo Metropolitan collaboration Chiba, M. ; Doi, K. ; Fujitani, T. ; et al.
Phys.Lett.B 202 (1988) 447-452, 1988.
Inspire Record 252965 DOI 10.17182/hepdata.38510

By using modularized NaI(Tl) detectors, we carried out a high statistics measurement of inclusive π 0 spectra from p p annihilation at rest. We did not observe any narrow π 0 peaks arising from baryonium production, p p →π 0 B . The σ upper limit of the yield varied between 10 −2 and 10 −4 depending on the mass and oncharge multiplicity. Three narrow peaks at 2 σ levels were seen at approximately the same masses as in the previous measurement of p p → γ B .We also derived the yield of p p annihilation into π 0 M for M = ø , η ′, ω , ϱ 0 , η and π 0 .

1 data table
Table 1

No description provided.


Measurement and Analysis of the Reaction $\gamma \gamma \to \pi^+ \pi^- \pi^+ \pi^-$

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Lackas, W. ; et al.
Z.Phys.C 38 (1988) 521, 1988.
Inspire Record 252632 DOI 10.17182/hepdata.1916

We have measured the cross section of four charged pion production in photon-photon interactions in the invariant mass range 1.0≦Wγγ≦3.2 GeV and up toQ2=16 GeV2. For 1.2 GeV≦Wγγ≦1.7 GeV the process is dominated by ρ0ρ0 production with a rapid rise in cross section around 1.2 GeV, well below the nominal ρ0ρ0 threshold. The observed distributions in the two particle masses and in the production and decay angles are well described by an incoherent sum of the phase-space subprocesses γγ →ρ0ρ0, →ρ0π+π−, and →π+π−π+π−. A spin-parity analysis of the ρ0ρ0 system showsJP=2+ to dominate, although 0+ is also possible forWγγ≦1.4 GeV. Negative partity states are excluded.

12 data tables
Table 1

Fractions of subprocesses from 3-parameter fit to the no-tag data.

Table 2

Fractions of subprocesses from 2-parameter fit to the no-tag data in limited energy range. The Q=1R contribution is set equal to zero.

Table 3

Fractions of subprocesses from 3-parameter fit to the single-tag data.

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Tensor Meson Excitation in the Reaction $\gamma \gamma \to K^0_S K^0_S$

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Lackas, W. ; et al.
Z.Phys.C 37 (1988) 329, 1988.
Inspire Record 250982 DOI 10.17182/hepdata.15690

In the analysis of the reactione+e−→e+e−KS0Ks0 clear evidence for exclusive γγ→f2′ resonance production is observed. The productΓγγ ·B(f2′→K\(\bar K\)) is measured to be 0.10−0.03−0.02+0.04+0.03 keV independent of ana priori assumption on the helicity structure. Our data are consistent with a pure helicity 2 contribution and we derive an upper limit for the ratioΓγγ(0)/Γγγ. The absence of events in the mass region around 1.3 GeV clearly proves destructivef2−a2 interference and allows to measure the relative phases betweenf2,a2 andf2′. Upper limits on the production of the glueball candidate statesf2(1720) andX(2230) as well as theKS0KS0-continuum are given.

1 data table
Table 1

Data read from graph.


>A Measurement of the $\bar{p} p \to \pi^+ \pi^-$ Reaction for 158-{MeV}/$c \le p(\bar{p}) \le$ 275-{MeV}/$c$

Bardin, G. ; Burgun, G. ; Calabrese, R. ; et al.
Phys.Lett.B 192 (1987) 471-474, 1987.
Inspire Record 246571 DOI 10.17182/hepdata.30155

A measurement of the total cross section for the reaction p p → π + π − has been performed for seven values of the incident momentum between 158 and 275 MeV/ c . The values obtained, if compared with previous results at higher momenta, agree with a 1/ß dependence. The differential cross section sssumed over the whole incident momentum range has also been measured and the result of a fit by Legendre polynomials is given.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

4*PI*LEG(L=0,P=4) = 1.07 +- 0.13 mb.


STUDY OF POLARIZATION IN EXCLUSIVE PROTON - DEUTERON BREAKUP REACTION p D ---> p p n AT 1-GeV

Aleshin, N.P. ; Belostotsky, S.L. ; Dotsenko, Yu.V. ; et al.
LENINGRAD-87-1259, 1987.
Inspire Record 247406 DOI 10.17182/hepdata.9284

None

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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