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Study of $\omega \omega$ Systems Produced in 38-{GeV}/$c \pi^- p$ Collisions

The IHEP-IISN-LANL-LAPP-TSUIHEP collaboration Alde, D. ; Binon, F.G. ; Bricman, C. ; et al.

Phys.Lett.B 216 (1989) 451, 1989.

Inspire Record 267049 DOI 10.17182/hepdata.29857

The π − p→ ωω n reaction has studied for the first time at the 70 GeV IHEP accelerator. The six photons from the decay of the two ω mesons were detected in GAMS-2000, a hodoscope multi-photon spectometer. Two resonances decaying into ωω,X (1640) and X(1960), have been observed. Their quantum numbers are J PC =2 ++ , I G =0 + . The reaction is dominated by the one-pion exchange mechanism. The production cross sections σ. BR(X→ ωω ) are 0.65±0.15 μ b and 1.0±0.2 μ b, respectively.

2 data tables

Table 1

X(1640) IS A JPC - 2++, IG - 0+ MESON WITH MASS 1643+-7 MEV.

Table 2

X(1960) IS A JPC - 2++, IG - 0+ MESON WITH MASS 1956+-20 MEV.

EXPERIMENTAL DATA ON ELASTIC p p, n p, p d AND p gamma FORWARD SCATTERING AT INTERMEDIATE-ENERGIES

Dobrovolsky, A.V. ; Khanzadeev, A.V. ; Korolev, G.A. ; et al.

LENINGRAD-88-1454, 1988.

Inspire Record 270168 DOI 10.17182/hepdata.38078

None

26 data tables

Table 1

Table 2

Table 3

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Differential Cross-sections and Analyzing Powers for Small Angles $N P$ Elastic Scattering Between 376-{MeV} and 1135-{MeV}

Silverman, B.H. ; Lugol, J.C. ; Saudinos, J. ; et al.

Nucl.Phys.A 499 (1989) 763-788, 1989.

Inspire Record 264337 DOI 10.17182/hepdata.36902

We have measured absolute differential cross sections and analyzing powers for neutron-proton elastic scattering for momentum transfer 0.01 < | t |< 0.08 (GeV/ c ) 2 at several energies between 378 and 1135 MeV. The ionization chamber IKAR filled with methane was used as both a gas target and recoil detector. For the analyzing-power measurements the scattered neutron was detected in scintillation counters in coincidence with the recoil proton detected in IKAR. Special care was taken to ensure a precise absolute normalization of the cross sections, with overall systematic uncertainties of 4–7%.

19 data tables

Table 1

TOTAL SYSTEMATIC UNCERTAINTIES IN D(SIG)/D(T)=6.4 PCT.

Table 2

TOTAL SYSTEMATIC UNCERTAINTIES IN D(SIG)/D(T)=5.4 PCT.

Table 3

TOTAL SYSTEMATIC UNCERTAINTIES IN D(SIG)/D(T)=6.5 PCT.

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OBSERVATION OF AN EXOTIC MESON OF 1.9-GeV MASS DECAYING INTO eta-prime eta

The IFVE-Brussels-Annecy-Los-Alamos collaboration Alde, D. ; Binon, F.G. ; Bricman, C. ; et al.

Sov.J.Nucl.Phys. 48 (1988) 1035, 1988.

Inspire Record 264474 DOI 10.17182/hepdata.40730

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

OBSERVATION OF a1- COHERENT PRODUCTION IN ANTI-NEUTRINO NEON CHARGED CURRENT INTERACTIONS

Ammosov, V.V. ; Belkov, A.A. ; Burtovoy, V.S. ; et al.

JETP Lett. 47 (1988) 645, 1988.

Inspire Record 262818 DOI 10.17182/hepdata.40732

None

1 data table

Table 1

No description provided.

Production of Four Prong Final States in Photon-photon Collisions

The TPC/Two Gamma collaboration Aihara, H. ; Alston-Garnjost, M. ; Avery, R.E. ; et al.

Phys.Rev.D 37 (1988) 28, 1988.

Inspire Record 261630 DOI 10.17182/hepdata.3824

Results are presented on the exclusive production of four-prong final states in photon-photon collisions from the TPC/Two-Gamma detector at the SLAC e+e− storage ring PEP. Measurement of dE/dx and momentum in the time-projection chamber (TPC) provides identification of the final states 2π+2π−, K+K−π+π−, and 2K+2K−. For two quasireal incident photons, both the 2π+2π− and K+K−π+π− cross sections show a steep rise from threshold to a peak value, followed by a decrease at higher mass. Cross sections for the production of the final states ρ0ρ0, ρ0π+π−, and φπ+π− are presented, together with upper limits for φρ0, φφ, and K*0K¯ *0. The ρ0ρ0 contribution dominates the four-pion cross section at low masses, but falls to nearly zero above 2 GeV. Such behavior is inconsistent with expectations from vector dominance but can be accommodated by four-quark resonance models or by t-channel factorization. Angular distributions for the part of the data dominated by ρ0ρ0 final states are consistent with the production of JP=2+ or 0+ resonances but also with isotropic (nonresonant) production. When one of the virtual photons has mass (mγ2=-Q2≠0), the four-pion cross section is still dominated by ρ0ρ0 at low final-state masses Wγγ and by 2π+2π− at higher mass. Further, the dependence of the cross section on Q2 becomes increasingly flat as Wγγ increases.

12 data tables

Table 1

UNTAGGED DATA.

Table 2

TAGGED DATA, RESULTS OBTAINED USING TRANSVERSE-TRANSVERSE LUMINOSITY ONLY. DATA FOR Q2=0 ARE FROM UNTAGGED SAMPLE, ERRORS DUE TO RELATIVE NORMALISATION OF THESE SAMPLES IS INCLUDED INTO ERRORS QUOTED.

Table 3

UNTAGGED DATA.

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LAMBDA (1520) PRODUCTION IN NEUTRON - NUCLEON INTERACTIONS AT approximately 40-GeV NEUTRON ENERGY

Krastev, V.R. ; Aleev, A.N. ; Arefev, V.A. ; et al.

JINR-P1-88-31, 1988.

Inspire Record 261871 DOI 10.17182/hepdata.9450

None

6 data tables

Table 1

AVERAGE OVER ALL TARGETS.

Table 2

No description provided.

Table 3

No description provided.

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POLARIZATION OF EXCLUSIVE LAMBDA0 PARTICLES EMITTED FROM C, AL, CU, CD, PB NUCLEI AT 90-DEGREES IN LABORATORY SYSTEM. (IN RUSSIAN)

Vorobev, L.S. ; Gavrilov, V.B. ; Goryainov, N.A. ; et al.

MOSCOW INST. THEOR. EXP. PHYS. - ITEF-88-113 (88,REC.JAN.89) 18p, 1988.

Inspire Record 270426 DOI 10.17182/hepdata.9910

None

2 data tables

Table 1

No description provided.

Table 2

No description provided.

Evidence for a 1-+ Exotic Meson

The IHEP-Brussels-Los Alamos-Annecy(LAPP) collaboration Alde, D. ; Binon, F.G. ; Boutemeur, M. ; et al.

Phys.Lett.B 205 (1988) 397, 1988.

Inspire Record 260839 DOI 10.17182/hepdata.29972

A non q q ,J PC = 1 −+ , I G =1 − meson has been observed in the study of the exclusive reaction π − p→π 0 ηn at 100 GeV. Its mass is (1406±20) MeV. Its width is (180±30) MeV.

2 data tables

Table 1

No description provided.

Table 2

No description provided.