Grigull, R.
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The Production of Prompt Positrons at Low Transverse Momentum Increases With the Square of the Associated Charged Multiplicity

The Axial Field Spectrometer collaboration Åkesson, T. ; Albrow, M.G. ; Almehed, S. ; et al.
Phys.Lett.B 192 (1987) 463-470, 1987.
Inspire Record 244887 DOI 10.17182/hepdata.30156

We have measured the production of prompt positrons in pp collisions at √ s = 63 GeV and y = 0 in the p T interval 0.12< p T <1.0 GeV/c. The results indicate that the production of positrons at low p T (<0.4 GeV/ c ) is proportional to the square of the mean multiplicity in the central region | y | < 1. Such a quadratic dependence is not expected from final-state sources such as hadronic bremsstrahlung or hadronic decays, but is natural in models where low mass electron pairs are produced by interactions of constituents created during the collision.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Nuclear Effects in Deep Inelastic Muon Scattering on Deuterium and Iron Targets

The BCDMS collaboration Benvenuti, A.C. ; Bollini, D. ; Bruni, G. ; et al.
Phys.Lett.B 189 (1987) 483-487, 1987.
Inspire Record 244886 DOI 10.17182/hepdata.30200

New Results are presented on nuclear effects in deep inelastic muon scattering on deuterium and iron targets at large Q 2 . The ratio F Fe 2 (x) F D 2 2 (x) measured in the kinematic range 0.06⩽ x ⩽0.70, 14GeV 2 ⩽ Q 2 ⩽70 GeV 2 is in good agreement with earlier measurements in the region of x > 0.25. At lower x , the structure function ratio exhibits an enhancement of ≈5%.

1 data table
Table 1

Q**2 RANGE FOR EACH X BIN IS AS FOLLOWS: 14 TO 20, 16 TO 30, 18 TO 35, 18 TO 46, 20 TO 106, 23 TO 106, 23 TO 150, 26 TO 200, 26 TO 200, 26 TO 200 GEV**2.


ANTI-P P TOTAL CROSS-SECTIONS BELOW 420-MEV/C

Bugg, D.V. ; Hall, J. ; Clough, A.S. ; et al.
Phys.Lett.B 194 (1987) 563-567, 1987.
Inspire Record 253124 DOI 10.17182/hepdata.30120

p̄p total cross sections have been measured from 220 to 413 MeV/ c in small (⩽ 10 MeV/ c ) steps of momentum with statistics of ± 0.5 %. There is no evidence for structure in the cross section, and a limit of 8 mb MeV/ c 2 is set with 90% confidence on the strength of any narrow resonance down to 250 MeV/ c .

2 data tables
Table 1

Data taken with long target.

Table 2

Data taken with short target.


A Comparison of Inclusive $\rho^0$, $\rho^+$ and $\Omega$ Production in $K^+ P$ Interactions at 250-{GeV}/c

The EHS/NA22 collaboration Adamus, M. ; Agababyan, N.M. ; Ajinenko, I.V. ; et al.
Phys.Lett.B 198 (1987) 292-296, 1987.
Inspire Record 254609 DOI 10.17182/hepdata.30078

Inclusive data are presented on ϱ 0 ,ϱ + and ω produced in k + p interactions at 250 GeV/ c , for ϱ + and ω for the first time in K + p experiment. In the forward CM hemisphere, the ϱ + , ϱ 0 and ω differential production rates are equal within errors, and remarkably similar to muon-inelastic scattering data on ϱ 0 and ω at 280 GeV/ c .

1 data table
Table 1

No description provided.


Measurement of the Spin Dependent Neutron Proton Total Cross-section Differences $\Delta \Sigma^- T$ and $\Delta \Sigma^-$l Between 0.63-{GeV} and 1.08-{GeV}

Lehar, F. ; De Lesquen, A. ; Van Rossum, L. ; et al.
Phys.Lett.B 189 (1987) 241-244, 1987.
Inspire Record 249897 DOI 10.17182/hepdata.30198

We present first measurements of total cross section differences Δσ T and Δσ L for a polarized neutron beam transmitted through a polarized proton target. Measurements were carried out at SATURNE II, at 0.63, 0.88, 0.98 and 1.08 GeV. The results are compared with Δσ L data points deduced from p-d and p-p transmission experiments, and with phase shift analyses predictions. The present results together with the corresponding pp data yield two of the three spin dependent forward scattering amplitudes for isospin I =0.

1 data table
Table 1

Statistical errors are statistics and random fluctuations. Systematic error contains uncertainties in beam and target polarizations, hydrogen content of the target, and residual error due to misalignment.


MEASUREMENT OF DIFFERENTIAL CROSS-SECTIONS FOR THE PI- P ---> PI0 N CHARGE EXCHANGE SCATTERING FROM 1969-MEV/C TO 2965-MEV/C

Suzuki, Y. ; Adachi, T. ; Daigo, M. ; et al.
Nucl.Phys.B 294 (1987) 961-978, 1987.
Inspire Record 255227 DOI 10.17182/hepdata.33477

Precise measurements of the differential cross sections on the π − p→ π 0 n charge exchange scattering have been performed at six incident beam momenta of 1969, 2172, 2370, 2569, 2767 and 2965 MeV/ c covering a wide angular range of −0.95 < cos θ π ∗ < 0.95, where θ π ∗ is an emission angle of π 0 meson in the c.m.s. The results are compared with predictions of recent partial wave analyses.

2 data tables
Table 1

Total cross sections obtained by fitting the Legendre polynomials to the DCS data.

Table 2

Statistical errors only. Cos(theta) bin width is +- 0.025.


MEASUREMENT OF POLARIZATION PARAMETERS FOR THE PI- P ---> PI0 N CHARGE EXCHANGE SCATTERING FROM 1965-MEV/C TO 4220-MEV/C

Minowa, M. ; Adachi, T. ; Daigo, M. ; et al.
Nucl.Phys.B 294 (1987) 979-1000, 1987.
Inspire Record 255228 DOI 10.17182/hepdata.33402

Polarization parameters for the π − p → π 0 n charge exchange scattering have been measured at eight beam momenta between 1965 and 4220 MeV/ c using two different experimental set-ups. The angular range covered is −0.90 < cos θ π ∗ < 0.95 at the five momenta of 1965, 2168, 2360, 2566 and 2960 MeV/ c , where θ π ∗ is the emission angle of the π 0 meson in the c.m.s.. For three momenta of 2770, 3490 and 4220 MeV/ c , the measurements cover the forward angles of 0.1 < cos θ π ∗ < 1.0 . The results are compared with the predictions of π N partial wave analyses.

4 data tables
Table 1

Polarisation measurements from SETUP1. Errors are statistical only.

Table 2

Polarisation measurements from SETUP2. Errors are statistical only.

Table 3

Legendre polynomial coefficients for fit to differential cross section data.

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FAST TARGET FRAGMENTS IN INTERACTIONS OF RELATIVISTIC NUCLEI WITH PHOTOEMULSION. (IN RUSSIAN)

Antonchik, V.A. ; Bakaev, V.A. ; Bogdanov, V.G. ; et al.
Yad.Fiz. 46 (1987) 1344-1352, 1987.
Inspire Record 256945 DOI 10.17182/hepdata.2434

None

38 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Observation of the Tensor X (1810) Meson in 300-{GeV} Central $\pi^- N$ Collisions (In Russian)

The IHEP-IISN-LANL-LAPP-PISA collaboration Alde, D. ; Bellazzini, R. ; Binon, F.G. ; et al.
Sov.J.Nucl.Phys. 47 (1988) 810-812, 1988.
Inspire Record 254776 DOI 10.17182/hepdata.10167

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Measurement of the Two Photon Reaction $\gamma \gamma \to \pi^+ \pi^- \pi^+ \pi^-$ at Large Values of $Q^2$

The TASSO collaboration Braunschweig, W. ; Gerhards, R. ; Kirschfink, F.J. ; et al.
Z.Phys.C 41 (1988) 353-357, 1988.
Inspire Record 250570 DOI 10.17182/hepdata.15557

The process γγ→π+π−π+π− has been investigated in reactions of the typee+e−→e+e−π+π−π+π− in the single tag mode. The range of the four momentum squared of one of the virtual photons was 0.28 GeV2/c2≦Q2≦3.6 GeV2/c2, the average being 〈Q2〉=0.92 GeV2/c2; the other photon was quasi real. The reaction is mainly described by the channels γγ→ρ0ρ0 and γγ→4π (phase space), occuring with about equal probability. TheQ2-dependence of the cross section is in agreement with the ρ form factor.

2 data tables
Table 1

Data read from graph.. Additional overall systematic error 25%.

Table 2

Data read from graph.. Additional overall systematic error 25%.. The Q**2 approx 0 datum is deduced from the earlier TASSO paper, Brandelik et al, Phys. Lett. 97B(1980)448, (<a href=http://durpdg.dur.ac.uk/scripts/reacsearch.csh/TESTREAC/red+1151> RED = 1151 </a>) on rho0 rho0 production.