Avakian, E.O.
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$pi^- -- p$ interactions at 905, 960, and 1100 {MeV}

Pickup, E. ; Robinson, D.K. ; Salant, E.O. ; et al.
Phys.Rev. 132 (1963) 1819-1830, 1963.
Inspire Record 44761 DOI 10.17182/hepdata.75462

Single-pion production in π−−p interactions has been studied at 905, 960, and 1100 MeV. Comparison with the isobar and one-pion-exchange (OPE) mechanisms of pion production shows that, below 1 BeV, pion production occurs primarily through the formation of an intermediate excited state of the nucleon (isobar), while at higher energies the influence of the ρ resonance in the ππ system becomes increasingly important. There is some evidence for an I=2 state in the events at the lower energies.

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Pion spectra from the reaction p p ---> pi+- + anything at 28.5 gev

Sims, W.H. ; Hanlon, J. ; Salant, E.O. ; et al.
Nucl.Phys.B 41 (1972) 317-335, 1972.
Inspire Record 75159 DOI 10.17182/hepdata.8021

The single-particle inclusive pion spectrum from the reaction p + p → π ± + anything at 28.5 GeV is presented in both tabular and graphical form. The data are from exposures in the BNL 203 cm bubble chamber. The emphasis of this paper is on exhibiting the single-particle spectra in sufficient detail so that the data will be useful to those interested in testing models and developing new concepts.

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Pi0 and pi+ Production with Polarized Photons in the Energy Range 1-GeV - 2-GeV

Abrahamian, L.O. ; Avakian, R.O. ; Aganyants, Aleksandr O. ; et al.
Phys.Lett.B 48 (1974) 463-466, 1974.
Inspire Record 90760 DOI 10.17182/hepdata.43798

The asymmetry of π o and π + photoproduction from hydrogen has been measured. The π o -mesons were detected at 130° cms with E γ ranged from 0.9 to 1.65 GeV, and the π + -mesons at 40° cms with E γ ranged from 0.9 to 1.2 GeV. The results agree with model predictions of single pion photoproduction in the resonance region using fixed- t dispersion relations.

7 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).

Table 2

Axis error includes +- 0.0/0.0 contribution (?////).

Table 3

Axis error includes +- 0.0/0.0 contribution (?////).

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Pi0 and pi+ Production with Polarized Photons in the Resonance Region

Abrahamian, L.O. ; Avakian, R.O. ; Aganyants, Aleksandr O. ; et al.
EFI-136-75-YEREVAN, 1975.
Inspire Record 100164 DOI 10.17182/hepdata.43767

None

2 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (?////).

Table 2

Axis error includes +- 0.0/0.0 contribution (?////).


Cross-Section Asymmetry of eta Mesons Photoproduction by Polarized Photons in the Resonance Region

Abramian, L.O. ; Avakian, R.O. ; Aganyants, Aleksandr O. ; et al.
Pisma Zh.Eksp.Teor.Fiz. 25 (1977) 597-600, 1977.
Inspire Record 124683 DOI 10.17182/hepdata.39787

None

1 data table
Table 1

No description provided.


Measurement of Asymmetry in Photoproduction of pi0 Meson in the Resonance Region

Avakian, R.O. ; Avakian, E.O. ; Avetisian, A.E. ; et al.
Yad.Fiz. 26 (1977) 1014-1017, 1977.
Inspire Record 126317 DOI 10.17182/hepdata.19036

None

1 data table
Table 1

Axis error includes +- 10/10 contribution.


DETERMINATION OF CROSS-SECTIONS OF INELASTIC INTERACTION OF PIONS AND NUCLEONS WITH FE NUCLEI IN THE ENERGY INTERVAL 0.5-TEV - 5-TEV. (IN RUSSIAN)

Avakian, V.V. ; Garyaka, A.P. ; Gevorkian, S.R. ; et al.
Yad.Fiz. 40 (1984) 949-959, 1984.
Inspire Record 218762 DOI 10.17182/hepdata.17632

None

4 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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DETERMINING INELASTIC INTERACTION CROSS-SECTIONS FOR NUCLEONS AND PIONS INCIDENT ON CARBON AND LEAD NUCLEI AT 0.5-TEV - 5-TEV

Avakian, V.V. ; Gevorkian, S.P. ; Zhamkochian, V.M. ; et al.
Bull.Russ.Acad.Sci.Phys. 50N11 (1986) 4-7, 1986.
Inspire Record 242221 DOI 10.17182/hepdata.41509

None

1 data table
Table 1

No description provided.


Measurement of the neutron spin structure function g1(n) with a polarized He-3 internal target.

The HERMES collaboration Ackerstaff, K. ; Airapetian, A. ; Akushevich, I. ; et al.
Phys.Lett.B 404 (1997) 383-389, 1997.
Inspire Record 440904 DOI 10.17182/hepdata.44586

Results are reported from the HERMES experiment at HERA on a measurement of the neutron spin structure function $g_1~n(x,Q~2)$ in deep inelastic scattering using 27.5 GeV longitudinally polarized positrons incident on a polarized $~3$He internal gas target. The data cover the kinematic range $0.023<x<0.6$ and $1 (GeV/c)~2 < Q~2 <15 (GeV/c)~2$. The integral $\int_{0.023}~{0.6} g_1~n(x) dx$ evaluated at a fixed $Q~2$ of $2.5 (GeV/c)~2$ is $-0.034\pm 0.013(stat.)\pm 0.005(syst.)$. Assuming Regge behavior at low $x$, the first moment $\Gamma_1~n=\int_0~1 g_1~n(x) dx$ is $-0.037\pm 0.013(stat.)\pm 0.005(syst.)\pm 0.006(extrapol.)$.

2 data tables
Table 1

No description provided.

Table 2

Data extrapolated to full x region. Second systematic error is the error on this extrapolation.


The flavor asymmetry of the light quark sea from semi-inclusive deep inelastic scattering.

The HERMES collaboration Ackerstaff, K. ; Airapetian, A. ; Akopov, N. ; et al.
Phys.Rev.Lett. 81 (1998) 5519-5523, 1998.
Inspire Record 473345 DOI 10.17182/hepdata.44248

The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02<x<0.3 and 1 GeV^2<Q^2<10 GeV^2, for the first time from semi-inclusive deep-inelastic scattering. The quantity (dbar(x)-ubar(x))/(u(x)-d(x)) is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry dbar-ubar is found to be non-zero and x dependent, showing an excess of dbar over ubar quarks in the proton.

1 data table
Table 1

The ratio of parton distribution functions (PDF) is determined from the ratio of the differencies between charged pion yields for proton and neutron targets: (N_p(pi-)-N_n(pi-))/(N_p(pi+)-N_n(pi+)).