HEPData Search

A narrow meson which decays into ηη is observed in 38 GeV/ c π − p collisions at large momentum transfer. The experiment has been performed at the Serpukhov accelerator with the GAMS-2000 spectrometer. The mass of this new meson is (1755 ± 8) MeV, its width is less than 50 MeV. Its spin-parity is J PC =0 ++ or less probably 2 ++ .

1 data table

Table 1

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EXPERIMENTAL DATA ON AVERAGE NUMBER OF INTERACTED PROTONS IN INELASTIC AND CENTRAL NUCLEUS-NUCLEUS COLLISIONS AT 3.6-GeV/ N

Anikina, M.Kh. ; Abdurakhimov, A.U. ; Avramenko, S.A. ; et al.

Yad.Fiz. 45 (1987) 1680, 1987.

Inspire Record 235082 DOI 10.17182/hepdata.38968

None

17 data tables

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$p (^{3}$He, T) Charge Exchange Reaction at 4.4-{GeV}/$c$ - 18.3-{GeV}/$c$ With $\Delta$ Isobar Production

Ableev, V.G. ; Vorobev, G.G. ; Dimitrov, Kh. ; et al.

Sov.J.Nucl.Phys. 46 (1987) 300, 1987.

Inspire Record 235268 DOI 10.17182/hepdata.2438

None

4 data tables

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OBSERVATION OF A NARROW MESON WITH A MASS OF 1750-MeV DECAYING INTO eta eta PAIR

The Serpukhov-Brussels-Annecy(LAPP) collaboration Alde, D. ; Binon, F.G. ; Bricman, C. ; et al.

IFVE-86-155, 1986.

Inspire Record 234608 DOI 10.17182/hepdata.10523

None

3 data tables

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OBSERVATION OF THE rho0 AND pi- MESONS RESONANT STATE IN THE A(3) REGION

Antipov, Yu.M. ; Batarin, V.A. ; Bezzubov, V.A. ; et al.

Sov.J.Nucl.Phys. 45 (1987) 645, 1987.

Inspire Record 233252 DOI 10.17182/hepdata.40946

None

1 data table

Table 1

COHERENT AND INCOHERENT PI- --> PI2(1680)- --> PI- MU+ MU- DISSOCIATION CROSS SECTIONS.

2.22-{GeV} $\eta \eta^\prime$ Structure Observed in 38-{GeV}/$c$ and 100-{GeV}/$c \pi^- p$ Collisions

The Serpukhov-Brussels-Los Alamos-Annecy(LAPP) collaboration Alde, D. ; Binon, F. ; Bricman, C. ; et al.

Phys.Lett.B 177 (1986) 120, 1986.

Inspire Record 230300 DOI 10.17182/hepdata.40940

A structure has been observed at 2220 MeV in the mass spectrum of ηη ′ systems produced by 38GeV/ c and 100 GeV/ c ′ negative pions on protons. The angular distribution of the decay products shows that this structure is presumably a spin J ⩾ 2 meson.

2 data tables

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rivet Analysis
Cross-Sections and Charged Multiplicity Distributions for pi+ p, K+ p and p p Interactions at 250-GeV/c

The NA22 collaboration Adamus, M. ; Agababyan, N.M. ; Ajinenko, I.V. ; et al.

Z.Phys.C 32 (1986) 475, 1986.

Inspire Record 18431 DOI 10.17182/hepdata.15845

Cross sections and charged multiplicity distributions for π+p,K+p andpp interactions at 250 GeV/c are presented and compared to each other as well as to earlier (for π+p andK+p lower energy) data. Consistently, the meson-proton (M+p) data have narrower multiplicity distributions and higher average multiplicity thanpp data. Up to our energy, generalized KNO functions describe the energy dependence of the shape of the multiplity distribution with one parameter forM+p and one forpp collisions. If interpreted in terms of negative binomials, the parameter 1/k tends to be slightly lower forM+p than forpp data. For both types of hadron-hadron collision, 1/k is larger than fore+e− andlp collisions.

7 data tables

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A-dependence of $\eta$ Meson Inclusive Production at 10.5-{GeV}/$c$

Bitsadze, G.S. ; Budagov, Yu.A. ; Chirikov-Zorin, I.E. ; et al.

Nucl.Phys.B 279 (1987) 770, 1987.

Inspire Record 231123 DOI 10.17182/hepdata.39482

The experimental results are presented for ratios of ν-meson inclusive differential cross sections in 10.5 GeV/ c π + p, π + D and π + A collisions, R D/p =(d σ /d x F )( π + D → η X)/ (d σ /d x F ) π + p→ η X), R A =(d σ /d x F )( π + D→ η X) in the beam fragmentation region. The results are based on the statistics of ≈ 5 × 10 4 detected η → 2 γ decays. It is shown that the power α in the parametrisation R A ≈ A α ( xf ) does not change significantly with x F and its mean value is 0.50±0.02. The lower limit is obtained for the effective coefficient with string tension in the colour string model, κ ⩾ 3 GeV/fm. The observed growth of R A with x F can be explained by an assumption of a neutron halo with the factor H ≈ 4 in the nuclei.

5 data tables

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