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Study of the $\pi^+ \pi^+ \pi^- \pi^-$ System Centrally Produced by Incident $\pi^+$ and $p$ Beams at 85-{GeV}/$c$

The WA76 collaboration Armstrong, T.A. ; Bloodworth, I.J. ; Carney, J.N. ; et al.
Z.Phys.C 43 (1989) 55, 1989.
Inspire Record 276888 DOI 10.17182/hepdata.15434

The reactions π+p→π+(π+π+π-π-)p andpp→p(π+π+π-π-)p, where the (π+ π+ π- π-) system is centrally produced have been studied at 85 GeV/c. The π+π+π-π- mass spectrum shows evidence for thef1 (1285) meson with a mass of 1278±2 MeV and width 41±12 MeV which decays mainly through ρ0(770)π+π-. Thef1(1285) is also observed in the ηπ+π- channel. There is no significant evidence for ηππ or 4π decay modes of thef1(1420). The ρ0ρ0 production is found to be small. A Dalitz plot analysis of the 3π system shows evidence fora2 (1320) production and for a large contribution of theJPC=1++ ρπ wave.

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Measurement of the correlation function of cumulative protons in proton nucleus interaction at 7.5-GeV/c

Bayukov, Yu.D. ; Vlasov, A.V. ; Gavrilov, V.B. ; et al.
Sov.J.Nucl.Phys. 50 (1989) 447-451, 1989.
Inspire Record 292914 DOI 10.17182/hepdata.17270

None

1 data table
Table 1

No description provided.


Polarization parameters A(000n) and A(00nn) in elastic proton proton scattering in the energy region 690-MeV to 890-MeV

Vovchenko, V.G. ; Efimovykh, V.A. ; Zhdanov, A.A. ; et al.
Sov.J.Nucl.Phys. 49 (1989) 446-453, 1989.
Inspire Record 292935 DOI 10.17182/hepdata.17325

None

3 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (DUE TO QUAZIELASTIC BACKGROUND AND ERRORS IN POLARIZATION OF BEAM AND TARGET).

Table 2

Axis error includes +- 0.0/0.0 contribution (DUE TO QUAZIELASTIC BACKGROUND AND ERRORS IN POLARIZATION OF BEAM AND TARGET).

Table 3

Axis error includes +- 0.0/0.0 contribution (DUE TO QUAZIELASTIC BACKGROUND AND ERRORS IN POLARIZATION OF BEAM AND TARGET).


The interaction cross-section of protons with nuclei of air atoms at energies 2 x 10**16-eV

Efimov, N.N. ; Zhukov, V.Yu. ; Kalmykov, N.N. ; et al.
Sov.J.Nucl.Phys. 49 (1989) 558-559, 1989.
Inspire Record 292948 DOI 10.17182/hepdata.17328

None

1 data table
Table 1

NUCLEUS IS AVERAGE AIR NUCLEUS.


Measurement of the total cross section for the pion charge-exchange reaction Cl-37(pi+,pi0)Ar-37 at energies 280-MeV, 335-MeV, and 390-MeV.

Gavrin, V.N. ; Golubeva, M.B. ; Danshin, S.N. ; et al.
Sov.J.Nucl.Phys. 49 (1989) 197-200, 1989.
Inspire Record 284673 DOI 10.17182/hepdata.17335

None

1 data table
Table 1

No description provided.


Polarization of cumulative protons in the reaction gamma A --> p X.

Avakian, R.O. ; Avetisian, A.E. ; Arestakesian, G.A. ; et al.
Sov.J.Nucl.Phys. 49 (1989) 292-294, 1989.
Inspire Record 284675 DOI 10.17182/hepdata.17336

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Cross sections for interaction of tritium nuclei with protons and elastic H-3 p scattering at momentum 5-GeV/c.

Abdullin, S.K. ; Blinov, A.V. ; Vanyushin, I.A. ; et al.
Sov.J.Nucl.Phys. 49 (1989) 106-107, 1989.
Inspire Record 287546 DOI 10.17182/hepdata.2229

None

3 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.


Hidden Strangeness in the Proton? Determination of the Real Part of the Isospin Even - Forward Scattering Amplitude of Pion Nucleon Scattering at 54.3-{MeV}

Wiedner, U. ; Goring, K. ; Jaki, J. ; et al.
Phys.Rev.D 40 (1989) 3568-3581, 1989.
Inspire Record 287810 DOI 10.17182/hepdata.23079

The contradiction of the σ term of pion-nucleon scattering as deduced from the Karlsruhe-Helsinki phase shifts with the smaller value calculated by the chiral perturbation theory of QCD is well known. In an effort to clarify the discrepancy we have determined the real part of the isospin-even forward-scattering amplitude of pion-nucleon scattering at a pion energy Tπ=54.3 MeV by measurement of the elastic scattering of positive and negative pions on protons in the Coulomb-nuclear interference region. The deduced value is in agreement with the prediction of the Karlsruhe-Helsinki phase-shift analysis for that energy. The resulting large value of the σ term may be interpreted as being due to the influence of s¯s sea pairs even at large distances (small Q2) as previously suggested by the European Muon Collaboration measurement of deep-inelastic scattering of polarized muons on polarized protons.

1 data table
Table 1

No description provided.


K0(S) PRODUCTION IN ANTI-P P INTERACTIONS AT S**(1/2) = 630-GeV AND 1800-GEV

The CDF collaboration Abe, F. ; Amidei, D. ; Apollinari, G. ; et al.
Phys.Rev.D 40 (1989) 3791-3794, 1989.
Inspire Record 287811 DOI 10.17182/hepdata.22999

Measurements of inclusive transverse-momentum spectra for KS0 mesons produced in proton-antiproton collisions at s of 630 and 1800 GeV are presented and compared with data taken at lower energies. The ratio, as a function of pT, of the cross section for KS0 to that for charged hadrons is very similar to what is observed at lower energies. At 1800 GeV, we calculate the strangeness-suppression factor λ=0.40±0.05.

4 data tables
Table 1

Estimated effective cross sections for events which pass the trigger and selection criteria. The uncertainties in these represent the principal source of error in the overall normalisation of the results.

Table 2

Statistical errors only.

Table 3

Statistical errors only.

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ELASTIC P (POLARIZED) P (POLARIZED) SCATTERING BETWEEN 240-MEV AND 470-MEV

Onel, Y. ; Hausammann, R. ; Heer, E. ; et al.
Phys.Rev.D 40 (1989) 35-43, 1989.
Inspire Record 285140 DOI 10.17182/hepdata.23076

The polarization parameter Pn000, the two-spin parameters Dn0n0, Kn00n, Ds′0s0, Ds′0k0 and the three-spin parameters Ms′0sn and Ms′0kn have been measured for pp elastic scattering angles between 60° and 88° center of mass at 241 and 314 MeV incident kinetic energies, and between 38° c.m. and 98° c.m. at 341, 366, and 398 MeV. At 473 MeV, only Pn000 and Ds′0k0 were measured between 34° c.m. and 62° c.m. The experiment was performed at SIN using a polarized proton beam and a polarized butanol target. The polarization of the scattered proton was analyzed in a carbon polarimeter. The influence of these high-precision data on the Saclay-Geneva phase-shift analysis is discussed.

6 data tables
Table 1

Statistical errors only.

Table 2

Statistical errors only.

Table 3

Statistical errors only.

More…