Bohm, A.
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Evidence for a Narrow Resonance at 10.01-GeV in electron-Positron Annihilations

Darden, C.W. ; Hasemann, H. ; Krolzig, A. ; et al.
Phys.Lett.B 78 (1978) 364-365, 1978.
Inspire Record 131898 DOI 10.17182/hepdata.27427

We observe evidence for a secon narrow resonance in the reation e + e − → hadrons at √s around 10 GeV using the DASP detector at the DORIS storage ring. The mass of the resonance is (10.01 ± 0.02) GeV; its width is in agreement with the storage ring resolution of ≈ 9 MeV. From the integrated cross section, an electronic width of Λ ee = (0.35 ± 0.14) KeV is derived.

1 data table
Table 1

No description provided.


Measurements of Elastic Proton Proton Scattering at Large Momentum Transfer at the CERN Intersecting Storage Rings

Nagy, E. ; Orr, R.S. ; Schmidt-Parzefall, W. ; et al.
Nucl.Phys.B 150 (1979) 221-267, 1979.
Inspire Record 132162 DOI 10.17182/hepdata.34800

Final results of our measurements of elastic proton-proton scattering at the CERN Intersecting Storage Rings (ISR) for c.m. energies √ s from 23 to 63 GeV and momentum transfers | t | from 0.8 to 10 GeV 2 are presented. Absolute differential cross sections have been obtained using the split-field magnet detector facility (SFM) at the five standard energies for integrated luminosities ranging from 0.3 to 4.9 (pb) −1 . The rising total cross section is found to define a scale for diffractive phenomena near the forward peak, including the position of the diffraction minimum near t = −1.4 GeV 2 . The cross section at the minimum is strongly energy dependent, approximately as the ratio of the real to imaginary part of the scattering amplitude in the forward direction. The phase of the scattering amplitude is found to change sign near the minimum. The component of diffraction scattering beyond the second maximum has a much weaker t -dependence than expected in simple eikonal or constituent pictures connecting this region to the forward peak. A further break in slope is observed near t = −6 GeV 2 . There is no evidence for another minimum for t values up to 10 GeV 2 .

5 data tables
Table 1

No description provided.

Table 2

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Table 3

No description provided.

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Precise Tests of Triple Regge Theory From $\pi^0$ and $\eta$ Inclusive Production in 100-{GeV}/$c \pi^\pm p$ Collisions

Barnes, A.V. ; Fox, G.C. ; Kennett, R.G. ; et al.
Phys.Rev.Lett. 41 (1978) 1260, 1978.
Inspire Record 131753 DOI 10.17182/hepdata.13342

We present data on π0 and η inclusive production from 100-GeV/c π±p collisions in the kinematic region x>~0.7 and 0<−t≲4 (GeV/c)2. The results are in excellent agreement with the predictions of triple-Regge theory and we have extracted the ρ and A2 trajectories out to −t=4 (GeV/c)2.

39 data tables
Table 1

No description provided.

Table 2

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Table 3

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Precise Coherent $K_S$ Regeneration Amplitudes for C, Al, Cu, {SN} and Pb Nuclei From 20-{GeV}/$c$ to 140-{GeV}/$c$ and Their Interpretation

Gsponer, A. ; Hoffnagle, J. ; Molzon, W.R. ; et al.
Phys.Rev.Lett. 42 (1979) 13, 1979.
Inspire Record 6964 DOI 10.17182/hepdata.20800

We have determined the coherent KS regeneration amplitudes on various nuclei, from 20 to 140 GeV/c, using a particularly systematics-free technique. Our results are well represented by |(f−f¯)k|=2.23A0.758p−0.614 mb. This p dependence corresponds to an effective "nuclear" intercept ``αω(0)''=0.386±0.009, whereas the elementary value is αω(0)=0.44±0.01. Comparisons are made with data below 25 GeV/c, and with optical-model predictions. The latter work only if "αω(0)" is postulated to hold for the elementary amplitudes.

1 data table
Table 1

No description provided.


Electroproduction of Charged Pions in the Quark Fragmentation Region

Drews, G. ; Gebert, W. ; Janata, F. ; et al.
Phys.Rev.Lett. 41 (1978) 1433, 1978.
Inspire Record 131548 DOI 10.17182/hepdata.20866

This paper presents results of an experiment on hadron production in deep-inelastic electron scattering. Good agreement with the predictions of the quark-parton model is found. The Fragmentation functions for u and d quarks into pions are determined, and comparison is made with other deep-inelastic processes and with recent quark jet parametrizations.

1 data table
Table 1

No description provided.


Energy Dependence of the Spin Spin Correlation Parameter C(ll) = (L, L : O, O) in $p p$ Elastic Scattering Around $\theta$ (Center-of-mass) = 90-degrees

Auer, I.P. ; Beretvas, A. ; Colton, E. ; et al.
Phys.Rev.Lett. 41 (1978) 1436, 1978.
Inspire Record 131077 DOI 10.17182/hepdata.20865

We have measured the spin-spin correlation parameter CLL=(L, L;0, 0) in p−p elastic scattering around θc.m.=90° from plab=1.0 to 3.0 GeV/c. We observe a rapid energy dependence in CLL and describe our interpretation of the results.

13 data tables
Table 1

No description provided.

Table 2

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Table 3

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MESON RESONANCE PRODUCTION IN p p INTERACTIONS AT s**(1/2) OF 53-GeV

Alder, J.C. ; Block, M. ; Bohm, A. ; et al.
PRINT-78-0819 (CERN), 1978.
Inspire Record 131140 DOI 10.17182/hepdata.47305

None

1 data table
Table 1

No description provided.


XI- INCLUSIVE PRODUCTION IN K- p INTERACTIONS AT 8.25-GeV/c

The Birmingham-CERN-Glasgow-Michigan State-Paris collaboration Baubillier, M. ; Bloodworth, I.J. ; Bossen, G.J. ; et al.
LPNHEP-78-4, 1978.
Inspire Record 130775 DOI 10.17182/hepdata.70476

None

1 data table
Table 1

No description provided.


BACKWARD omega0 AND eta0 PRODUCTION IN pi p INTERACTIONS AT 9-GeV/c AND 12-GeV/c

Benkheiri, P. ; Eisenstein, Bob I. ; Fleury, P. ; et al.
Nucl.Phys.B 150 (1979) 268-286, 1979.
Inspire Record 132166 DOI 10.17182/hepdata.34809

We have studied the backward production of ω 0 mesons in the u -channel I u = 1 2 exchange reaction π − p → N 0 (1680) ω 0 at 9 GeV/ c and 12 GeV/ c incident momenta. The data come from an experiment performed at the CERN Omega Spectrometer using a fast proton trigger device. The backward production of the η 0 meson has also been observed and the coupling constant ratio g η NN / g π NN has been estimated.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

JACKSON FRAME (U-CHANNEL HELICITY SYSTEM).


Measurement and Analysis of the Reaction $\pi^- p \to \rho^0 n$ on a Polarized Target

The CERN-Munich collaboration Becker, H. ; Blanar, G. ; Blum, W. ; et al.
Nucl.Phys.B 150 (1979) 301-325, 1979.
Inspire Record 132603 DOI 10.17182/hepdata.34819

The reaction π − p→ π + π − n has been measured in a high-statistics experiment on a transversely polarized proton target at 17.2 GeV, and unexpectedly large nucleon polarization effects have been observed. Combining the results of this experiment with a measurement on a hydrogen target allows a model-independent partial-wave analysis in terms of the “nucleon transversity” amplitudes. Unique or at most twofold ambiguous solutions are obtained. In particular we find a high lower limit ( ⪆30% ) of the spin non-flip unnatural exchange amplitudes at low | t |. These amplitudes, interpreted as being due to the exchange of an object with the quantum numbers of the A 1 , have been assumed to be absent in previous analyses. In checking the consequences of this finding on the old results, we test the validity of the rank-two assumotions for the density matrix. We find a small but significant deviation, which shows the need for a new phase-shift analysis including the A 1 exchange contribution.

2 data tables
Table 1

MASS DEPENDENCE OF NORMALIZED T-CHANNEL MOMENTS SCALED TO 100 PCT POLARIZED PROTONS.

Table 2

T DEPENDENCE OF NORMALIZED T-CHANNEL MOMENTS IN THE RHO REGION SCALED TO 100 PCT POLARIZED PROTONS.