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Absence of discrete s-channel resonances in anti-p p interactions at intermediate energies

Fields, T. ; Cooper, W.A. ; Rhines, D.S. ; et al.
Phys.Rev.Lett. 27 (1971) 1749-1752, 1971.
Inspire Record 75556 DOI 10.17182/hepdata.21475

We give new experimental results on ρω interference and two-body cross sections in p¯p annihilation at 2.3GeVc. These are used, together with ρω interference results from lower energies, to argue that the annihilation process is not mediated by discrete s-channel mesonic resonances in the mass range 2.1-2.6 GeV.

1 data table
Table 1

No description provided.


Pi- p elastic scattering near 180 degrees between 600 and 1280 mev/c

Crabb, D.G. ; Keller, R. ; O' Fallon, J.R. ; et al.
Phys.Rev.Lett. 27 (1971) 216-219, 1971.
Inspire Record 68952 DOI 10.17182/hepdata.21460

The differential cross sections for π−p elastic scattering over the angular range 155° to 177° in the center of mass have been measured at 33 incident-pion momenta in the range 600 to 1280 MeV/c. Angular distributions are presented. The extrapolated differential cross sections at 180° show considerable structure, in particular a dip near 1150 MeV/c. In general the near-180° cross sections do not agree with existing phase shift solutions above 1000 MeV/c

48 data tables
Table 1

INTERPOLATED DATA.

Table 2

INTERPOLATED DATA.

Table 3

INTERPOLATED DATA.

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Reaction pi+ p ---> rho+ p at 2.67 gev/c - a study of isoscalar exchanges

Michael, W. ; Gidal, G. ;
Phys.Rev.Lett. 28 (1972) 1475-1479, 1972.
Inspire Record 75483 DOI 10.17182/hepdata.21443

Results are presented of a study of the reaction π+p→ρ+p at 2.67 GeV/c incident π+ momentum. The contributions due to given spin-parity exchanges are isolated; and, by combining these results with those of a similar π− experiment, the It=0 component of each series is separated. The ω (I=0, JPG=1−−) exchange contribution shows a pronounced dip at −t=0.4 (GeV/c)2. Evidence is presented for the exchange of a state of minimum quantum numbers, H (I=0, JPG=1+−).

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of polarization pn pi- p ---> pi0 n at 3.5 and 5.0 gev/c

Hill, D. ; Koehler, P. ; Novey, T. ; et al.
Phys.Rev.Lett. 30 (1973) 239-242, 1973.
Inspire Record 84552 DOI 10.17182/hepdata.21395

The polarization parameter P(t) for the reaction π−p→π0n has been measured at 3.5 and 5.0 GeV/c over the range 0.2<~−t<~1.8 (GeV/c)2. The two γ rays from the π0 decay were detected in a large lead-glass hodoscope. The results agree with the positive polarization values found in earlier Argonne National Laboratory data at −t<0.35 (GeV/c)2. P(t) drops to a small value near t=−0.6 (GeV/c)2 and remains the same out to t=−1.8 (GeV/c)2.

1 data table
Table 1

DATA POINTS MEASURED FROM SMALL GRAPH.


NUCLEAR REACTIONS OF SILVER WITH 300-GEV PROTONS.

English, G. ; Yu, Y.W. ; Porile, N.T. ;
Phys.Rev.Lett. 31 (1973) 244-247, 1973.
Inspire Record 81747 DOI 10.17182/hepdata.21359

Cross sections of 27 radionuclides formed by the interaction of 300-GeV protons with silver were determined on the assumption that the cross section of the reaction Al27(p, 3pn) remains the same as at 10-30 GeV. The results are compared with the corresponding values obtained at 11.5 GeV. The average value of the ratio σ300σ11.5 for all products ranging from Be7 to Ag106m is 0.91±0.07 and is independent of mass number.

2 data tables
Table 1

No description provided.

Table 2

SIG(C=11.5) means the cross section for 11.5 GeV Plab, obtained in previousexperiment.


Characteristics of the Reaction $pp \to p + X$ at 205 GeV/c.

Barish, S.J. ; Colley, D.C. ; Schultz, P.F. ; et al.
Phys.Rev.Lett. 31 (1973) 1080-1083, 1973.
Inspire Record 81790 DOI 10.17182/hepdata.21407

The inelastic reaction p+p→p+X is studied at 205 GeV/c. The distribution of the square of the missing mass, M2, shows a large diffractivelike peak at low M2 due to two-, four-, and six-prong events. The slope of the invariant cross section versus t decreases with increasing M2. The energy dependences of the multiplicity moments for the recoiling system X are similar to those for corresponding moments for p+p→(n chargedparticles).

1 data table
Table 1

No description provided.


Prism plot - a new analysis of multibody final states

Brau, J.E. ; Dao, F.T. ; Hodous, M.F. ; et al.
Phys.Rev.Lett. 27 (1971) 1481-1485, 1971.
Inspire Record 68878 DOI 10.17182/hepdata.21501

We present a new technique for analyzing multibody states. This analysis makes possible the selection of samples of events that contain only resonances, particle correlations, or phase space. A unique feature of this analysis is that every event in the data is assigned to a particular sample. The three-body final state π++p→p+π++π0 is analyzed as an example.

1 data table
Table 1

No description provided.


SEARCH FOR QUARKS AND HEAVY STABLE PARTICLES PRODUCED AT 300-GEV.

Leipuner, L.b. ; Larsen, R.c. ; Sessoms, A.l. ; et al.
Phys.Rev.Lett. 31 (1973) 1226-1229, 1973.
Inspire Record 81800 DOI 10.17182/hepdata.21373

We report a search for quasistable particles with anomalous charge or large mass produced by the interaction of 300-GeV protons at the National Accelerator Laboratory. Analyses of energy losses in a counter telescope lead to cross-section limits of 10−35 cm2 for particles with charges of e3 and 2e3 and 5×10−31 cm2 for charge-4e3 particles. Time-of-flight measurements gave cross-section limits of about 10−31 cm2 for the production of massive charged particles.

1 data table
Table 1

No description provided.


Measurements of the symmetries in the differential cross sections for anti-p p ---> anti-p p and anti-p p ---> pi- pi+ using polarized protons

Ehrlich, R.D. ; Etkin, A. ; Glodis, P. ; et al.
Phys.Rev.Lett. 28 (1972) 1147-1150, 1972.
Inspire Record 75507 DOI 10.17182/hepdata.21461

We report measured asymmetries as a function of polar scattering angle for the reactions p¯p→π−π+ and p¯p→p¯p, using a polarized proton target. The annihilation data, obtained at a p¯ momentum of 1.64 GeV/c, are the first asymmetry data to be collected for this channel. A fit of these data and published differential cross section data is made by a partial-wave expansion, and the results are compared with a previous analysis. The elastic scattering data, obtained at 1.64 and 2.55 GeV/c, are fitted with an eight-parameter strong-absorption model.

1 data table
Table 1

No description provided.


FORWARD COMPTON SCATTERING FROM HYDROGEN AND DEUTERIUM AT 8-GeV AND 16-GeV

Boyarski, A. ; Coward, D.H. ; Ecklund, Stanley D. ; et al.
Phys.Rev.Lett. 26 (1971) 1600-1604, 1971.
Inspire Record 67269 DOI 10.17182/hepdata.21513

Compton-scattering cross sections from hydrogen (γp→γp) and from deuterium have been measured at four-momentum transfer t in the range 0.014<~−t<~0.17 GeV2 and photon energies of 8 and 16 GeV. Fits to our proton data of the form dσdt=AeBt give B≈7.8 GeV−2 and an intercept A which is in agreement with the optical point. Both coherent scattering from deuterons and incoherent scattering from neutrons and protons are seen from deuterium. A small difference between the neutron and proton cross sections is seen, indicating the presence of about a 3% isovector t-channel exchange amplitude in addition to the predominant isoscalar amplitude. The vector-dominance model predicts lower cross sections (by at least 20%) for both the hydrogen and deuterium cases.

2 data tables
Table 1

Axis error includes +- 3/3 contribution (SUBTRACTIONS WERE MADE FOR THE REACTIONS GAMMA P --> PI0 N, ETA N, OMEGA N AND PI0 DELTA(1232)).

Table 2

Axis error includes +- 3/3 contribution (SUBTRACTIONS WERE MADE FOR THE REACTIONS GAMMA P --> PI0 N, ETA N, OMEGA N AND PI0 DELTA(1232)).