Gomez, Gervasio
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Evidence for Vector-Meson Effects on pi0 Photoproduction From Hydrogen

Talman, R.M. ; Clinesmith, C.R. ; Gomez, R. ; et al.
Phys.Rev.Lett. 9 (1962) 177-180, 1962.
Inspire Record 944904 DOI 10.17182/hepdata.19353

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


$\bar{p} p$ Elastic Scattering for Incident Momenta Between 1.0 and 2.50 BeV/c

Barish, B. ; Fong, D. ; Gomez, R. ; et al.
Phys.Rev.Lett. 17 (1966) 720-722, 1966.
Inspire Record 944917 DOI 10.17182/hepdata.203

None

3 data tables
Table 1

'1'. '2'. '3'. '4'. '5'.

Table 2

No description provided.

Table 3

No description provided.


On the construction of pion photoproduction amplitudes from experimental data

Alvarez-Estrada, R.F. ; Sanchez-Gomez, J.L. ;
Nucl.Phys.B 26 (1971) 433-444, 1971.
Inspire Record 68784 DOI 10.17182/hepdata.76722

New formulae for constructing the pion photoproduction amplitude J from experimental data are presented. The phase of J is expressed in terms of its zeroes in the energy plane, the particle poles and a dispersion integral over the modulus of J , the latter being given, except for a finite unphysical interval, in terms of differential cross sections and recoil nucleon polarizations. For γ p→ π + n at t ≈−0.870 μ 2 , where the unphysical-region contribution vanishes, the zeroes are found approximately, so that the phase of J can be uniquely determined from the experimental data.

3 data tables

Study of the coherent reaction k+ d ---> k0 pi+ d at 2 gev/c

Firestone, A. ; Hiscock, W. ; Proudfoot, L. ; et al.
Nucl.Phys.B 52 (1973) 403-413, 1973.
Inspire Record 84258 DOI 10.17182/hepdata.32649

We have made a study of the coherent reaction K + d → K 0 π + d at 2 GeV/ c , using data obtained in the Lawrence Berkeley Laboratory 25 inch bubble chamber. The cross section for this reaction is 324 ± 25 μ b, after correction for invisible K 0 decays. This reaction is dominated primarily by vector exchange. We determine the parameters of the ω trajectory to be α ω = (0.33 ± 0.04) + t .

3 data tables
Table 1

No description provided.

Table 2

SLOPE IS 9.4 +- 0.5 GEV**-2 FOR -T > 0.02 GEV**2 AND 10.4 +- 0.6 GEV**-2 FOR -TP > 0.

Table 3

No description provided.


MEASUREMENT OF pi p ELASTIC SCATTERING AT 14.15-GeV/c

Dzierba, A.R. ; Ford, William T. ; Gomez, R. ; et al.
Phys.Rev.D 7 (1973) 725, 1973.
Inspire Record 83700 DOI 10.17182/hepdata.22104

Results are presented of a wire-spark-chamber spectrometer measurement of the differential cross section for π−p elastic scattering at 14.15 GeV/c. The region covered in the square of the four-momentum transfer, t, is 0.01<−t<0.78 (GeV/c)2. The cross section is found to obey very nearly a simple exponential t dependence with no evidence of structure. A fit to the data of the form dσdt∝exp(bt+ct2) on the range 0.05<−t<0.78 (GeV/c)2 (i.e., above the region affected by Coulomb scattering) yields b=8.26±0.10 (GeV/c)2 and c=1.01±0.17 (GeV/c)−4. Considering the results of previous measurements, b≃11 (GeV/c)−2 for −t<0.05 (GeV/c)2, a deviation from the simple exponential near −t≃0.05 (GeV/c)2 is indicated.

1 data table
Table 1

No description provided.


pi0 and rho0 Photoproduction from 6-GeV to 18-GeV

Barish, B. ; Gomez, R. ; Kreinick, D. ; et al.
Phys.Rev.D 9 (1974) 566, 1974.
Inspire Record 94529 DOI 10.17182/hepdata.21952

Differential cross sections for π0 and ρ0 photoproduction from protons have been measured at photon energies 6, 12, and 18 GeV and momentum transfers 0.5 to 3 (GeVc)2.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Production of Jets and Single Particles at High p(T) in 200-GeV Hadron Beryllium Collisions

Bromberg, C. ; Fox, G. ; Gomez, R. ; et al.
Nucl.Phys.B 134 (1978) 189-241, 1978.
Inspire Record 5774 DOI 10.17182/hepdata.35152

We present results from an experiment studying the production of single particles and jets (groups of particles) with high p ⊥ (transverse momentum) in 200 GeV/ c interactions on a beryllium target. We give a detailed discussion of the ambiguities in the jet definition. The jet and single-particle cross sections have a similar shape but the jet cross section is over two orders of magnitude larger. The events show evidence for the coplanar structure suggested by constituent models, and the momentum distributions of charged particles give strong support to a simple quark-quark scattering model.

4 data tables
Table 1

NOMINAL CALORIMETER THRESHOLD WAS 3 GEV/C. AT WHICH PT TRIGGER EFFICIENCY SHOULD BE 50 PCT. THIS DATA HAS AN ADDITIONAL 20 PCT. NORMALISATION ERROR.

Table 2

THIS TABLE REFERS TO JET WITH THRESHOLD OF 3 GEV/C. THE JET PONTS ARE AVERAGED OVER ROUGHLY EQUAL AMOUNTS OF +VE AND -VE BEAMS.

Table 3

THIS TABLE REFERS TO JET WITH THRESHOLD OF 4 GEV/C. THE JET PONTS ARE AVERAGED OVER ROUGHLY EQUAL AMOUNTS OF +VE AND -VE BEAMS.

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Experimental Tests of Quantum Chromodynamics in High $p_T$ Jet Production in 200-{GeV}/$c$ Hadron - Proton Collisions

Bromberg, C. ; Fox, G. ; Gomez, R. ; et al.
Phys.Rev.Lett. 43 (1979) 565, 1979.
Inspire Record 141467 DOI 10.17182/hepdata.52007

Data on inclusive jet production in the transverse-momentum (p⊥) range 0-8 GeV/c for 200-GeV/c p, π−, π+, K−, K+, and p¯ incident on a hydrogen target are presented. The jet cross section is fully corrected for losses and biases, and compared with the predictions of a model based on quantum chromodynamics. Both the absolute cross section and the inclusive charged-particle distributions inside and outside the jet are in qualitative agreement with the model.

8 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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STUDY OF A2 PRODUCTION IN THE REACTION PI- P ---> K0 K- P AT 50-GEV/C, 100-GEV/C, AND 175-GEV/C

Bromberg, C. ; Dickey, J.o. ; Fox, G. ; et al.
Phys.Rev.D 27 (1983) 1-11, 1983.
Inspire Record 191493 DOI 10.17182/hepdata.23901

The reaction π−p→K0K−p has been measured from 50 to 175 GeV/c. The production characteristics of the A2 have been analyzed. We find spin and t dependence similar to lower energies, but the cross section falls rapidly with energy. In a Regge description of π−p→A2−p our data imply a rather small Pomeron-exchange component.

6 data tables
Table 1

No description provided.

Table 2

RAW CROSS SECTION WITHIN MASS CUTS.

Table 3

No description provided.

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Highlights of the Reaction $\pi^- p \to \pi^- \pi^+ n$ at 100-{GeV}/$c$ and 175-{GeV}/$c$

Bromberg, C. ; Dickey, J.O. ; Fox, G.C. ; et al.
Phys.Rev.D 29 (1984) 588, 1984.
Inspire Record 13822 DOI 10.17182/hepdata.33875

We present a summary of the physics results from an experimental study of the reaction π−p→π−π+n at 100 and 175 GeV/c incident-beam momentum. Our data show the continuing dominance of one-pion exchange in these reactions with the characteristic 1Plab2 momentum dependence. We extract the pion Regge trajectory from our data on π−p→ρ0n and study the zero structure of the ππ differential cross section up to sππ=12 GeV2.

9 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

SPHERICAL HARMONIC MOMENTS.

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