Asano, Y.
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rivet Analysis
Study of pi+ pi- pair production in a two photon process at TRISTAN

The VENUS collaboration Yabuki, Fumiaki ; Abe, Koya ; Amako, Katsuya ; et al.
J.Phys.Soc.Jap. 64 (1995) 435-447, 1995.
Inspire Record 392360 DOI 10.17182/hepdata.38533

None

11 data tables
Table 1

ABS(COS(THETA)) < 0.4 for M(P=3 4) = 1.025 GeV.

Table 2

No description provided.

Table 3

No description provided.

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Measurement of the Reactions $e^+ e^- \to e^+ e^-$ and $e^+ e^- \to \gamma \gamma$ at $\sqrt{s}=52$-{GeV}

The VENUS collaboration Abe, Koya ; Amako, Katsuya ; Arai, Yasuo ; et al.
J.Phys.Soc.Jap. 56 (1987) 3767-3770, 1987.
Inspire Record 251276 DOI 10.17182/hepdata.38511

None

2 data tables
Table 1

No description provided.

Table 2

No description provided.


Inclusive $\Lambda^0$ Polarization in Proton Nucleus Collisions at 12-{GeV}

Abe, F. ; Hara, K. ; Kim, S. ; et al.
Phys.Rev.D 34 (1986) 1950-1959, 1986.
Inspire Record 237791 DOI 10.17182/hepdata.23459

The polarization of Λ0 hyperons in inclusive production by 12-GeV protons on nuclei has been measured for beryllium, copper, and tungsten targets. Data are obtained at five production angles, 3.5°, 5.0°, 6.5°, 8.0°, and 9.5°, covering the kinematic range 0.26≤xF≤0.77 and 0.4≤pT≤1.5 GeV/c. The dependence of the polarization on target nuclei is investigated by statistical analyses of the data. The polarization at fixed pT increases roughly linearly with xF. The present results are compared with other work at higher energies in terms of the A dependence and the (xF,pT) dependence.

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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A kinematically complete measurement of K+ --> pi+ pi0 pi0 decays.

The KEK PS E246 collaboration Shin, Y.H. ; Abe, M. ; Aoki, M. ; et al.
Eur.Phys.J.C 12 (2000) 627-631, 2000.
Inspire Record 526005 DOI 10.17182/hepdata.24453

None

1 data table
Table 1

The Dalitz plot parameters G, H, and K are used in the standard parameterization of the matrix element squared (see PDG): M**2 = 1 + G*X + H*X**2 + K*Y**2,where X = (s3-s0)/m(PI)**2 and Y = (s1-s2)/m(PI)**2, s1 = (pK - pPI0)**2, s2 = (pK - pPI0)**2, s3 = (pK - pPI+)**2, s0 = (s1+s2+s3)/3.


POLARIZATION OF LAMBDA0 HYPERONS IN INCLUSIVE PRODUCTION BY 12-GEV PROTONS ON TUNGSTEN

Abe, F. ; Hara, K. ; Kim, N. ; et al.
Phys.Rev.Lett. 50 (1983) 1102-1105, 1983.
Inspire Record 192461 DOI 10.17182/hepdata.20570

The authors have measured the polarization of 2.4×105 Λ0 hyperons in inclusive production by 12-GeV protons on tungsten at three production angles, 3.5°, 6.5°, and 9.5°. In terms of Feynman's xF and transverse momentum of Λ0, the kinematical range is 0.3<~xF<~0.8 and 0.4<~pT<~1.6 GeV/c. The observed polarization does not depend strongly on xF and increases linearly with pT to 16% at pT=1.0 GeV/c, showing a tendency to level off above that point.

6 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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The gamma(pol.) p --> K+ Lambda and gamma(pol.) p --> K+ Sigma0 reactions at forward angles with photon energies from 1.5-GeV to 2.4-GeV.

The LEPS collaboration Sumihama, M. ; Ahn, J.K. ; Akimune, H. ; et al.
Phys.Rev.C 73 (2006) 035214, 2006.
Inspire Record 701097 DOI 10.17182/hepdata.41824

Differential cross sections and photon beam asymmetries for the gamma p rightarrow K+ Lambda and gamma p rightarrow K+ Sigma0 reactions have been measured in the photon energy range from 1.5 GeV to 2.4 GeV and in the angular range from Theta_{cm} = 0 to 60 of the K+ scattering angle in the center of mass system at the SPring-8/LEPS facility. The photon beam asymmetries for both the reactions have been found to be positive and to increase with the photon energy. The measured differential cross sections agree with the data measured by the CLAS collaboration at cosTheta_{cm}<0.9 within the experimental uncertainties, but the discrepancy with the SAPHIR data for the K+Lambda reaction is large at cosTheta_{cm}>0.9. In the K+Lambda reaction, the resonance-like structure found in the CLAS and SAPHIR data at W=1.96 GeV is confirmed. The differential cross sections at forward angles suggest a strong K-exchange contribution in the t-channel for the K+Lambda reaction, but not for the K+Sigma0 reaction.

14 data tables
Table 1

Photon beam asymmetries for the two reactions as a function of CM angle for photon beam energy 1.55 GeV (W=1.947 GeV).

Table 2

Photon beam asymmetries for the two reactions as a function of CM angle for photon beam energy 1.65 GeV (W=1.994 GeV).

Table 3

Photon beam asymmetries for the two reactions as a function of CM angle for photon beam energy 1.75 GeV (W=2.041 GeV).

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Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)Sigma0 reactions at E(gamma) = 1.5-GeV - 2.4-GeV.

The LEPS collaboration Zegers, R.G.T. ; Sumihama, M. ; Ahn, D.S. ; et al.
Phys.Rev.Lett. 91 (2003) 092001, 2003.
Inspire Record 613016 DOI 10.17182/hepdata.31708

Beam polarization asymmetries for the p(gamma,K+)Lambda and p(gamma,K+)sigma0 reactions are measured for the first time for Egamma=1.5-2.4 GeV and 0.6<cos(theta_cm(K+))<1.0 by using linearly polarized photons at the Laser-Electron-Photon facility at SPring-8 (LEPS). The observed asymmetries are positive and gradually increase with rising photon energy. The data are not consistent with theoretical predictions based on tree-level effective Lagrangian approaches. Including the new results in the development of the models is, therefore, crucial for understanding the reaction mechanism and to test the presence of baryon resonances which are predicted in quark models but are sofar undiscovered.

18 data tables
Table 1

Measured beam asymmetries for the reaction GAMMA P --> K+ LAMBDA for beam energy 1.5 to 1.6.

Table 2

Measured beam asymmetries for the reaction GAMMA P --> K+ LAMBDA for beam energy 1.6 to 1.7.

Table 3

Measured beam asymmetries for the reaction GAMMA P --> K+ LAMBDA for beam energy 1.7 to 1.8.

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Near-threshold photoproduction of $\Lambda(1520)$ from protons and deuterons

Muramatsu, N. ; Chen, J.Y. ; Chang, W.C. ; et al.
Phys.Rev.Lett. 103 (2009) 012001, 2009.
Inspire Record 817890 DOI 10.17182/hepdata.22937

Photoproduction of $\Lambda$(1520) with liquid hydrogen and deuterium targets was examined at photon energies below 2.4 GeV in the SPring-8/LEPS experiment. For the first time, the differential cross sections were measured at low energies and with a deuterium target. A large asymmetry of the production cross sections from protons and neutrons was observed at backward K$^{+/0}$ angles. This suggests the importance of the contact term, which coexists with t-channel K exchange under gauge invariance. This interpretation was compatible with the differential cross sections, decay asymmetry, and photon beam asymmetry measured in the production from protons at forward K$^+$ angles.

4 data tables
Table 1

The measured differential cross sections from the liquid hydrogen target, protons, as a function the K+ polar angle.

Table 2

The measured differential cross sections from the liquid hydrogen target, protons, as a function the photon energy at forward K+ polar angles of 19-43 degrees .

Table 3

The measured of differential cross section at backward K+/K0 polar angles of 120-150 degrees as a function of photon energy from the liquid hydrogen target, protons, and liquid deuterium target, deuterons.

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Differential cross section and photon beam asymmetry for the gamma(pol.) n --> K+ Sigma- reaction at e(gamma) = 1.5-GeV - 2.4-GeV.

Kohri, H. ; Ahn, D.S. ; Ahn, J.K. ; et al.
Phys.Rev.Lett. 97 (2006) 082003, 2006.
Inspire Record 709901 DOI 10.17182/hepdata.41825

Differential cross sections and photon beam asymmetries have been measured for the gamma n -> K+ Sigma- and gamma p -> K+ Sigma0 reactions separately using liquid deuterium and hydrogen targets with incident linearly polarized photon beams of Egamma=1.5-2.4 GeV at 0.6<cosTheta<1. The cross section ratio of sigma(K+Sigma-)/sigma(K+Sigma0), expected to be 2 on the basis of the isospin 1/2 exchange, is found to be close to 1. For the K+Sigma- reaction, large positive asymmetries are observed indicating the dominance of the K*-exchange. A large difference between the asymmetries for the K+Sigma- and K+Sigma0 reactions can not be explained by simple theoretical considerations.

4 data tables
Table 1

Differential cross section for GAMMA P --> K+ SIGMA0.. Errors are statistical only.

Table 2

Photon beam asymmetry for GAMMA N --> K+ SIGMA-.. Errors are statistical only.

Table 3

Photon beam asymmetry for GAMMA P --> K+ SIGMA0.. Errors are statistical only.

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Diffractive Phi-meson photoproduction on proton near threshold.

The LEPS collaboration Mibe, T. ; Chang, W.C. ; Nakano, T. ; et al.
Phys.Rev.Lett. 95 (2005) 182001, 2005.
Inspire Record 684863 DOI 10.17182/hepdata.31587

Photoproduction of $\phi$-meson on protons was studied by means of linearly polarized photons at forward angles in the low-energy region from threshold to $E_{\gamma}$= 2.37 GeV. The differential cross sections at $t = -|t|_{min}$ do not increase smoothly as $E_{\gamma}$ increases, but show a local maximum at around 2.0 GeV. The angular distributions demonstrate that $\phi$-mesons are photo-produced predominantly by helicity-conserving processes, and the local maximum is not likely due to unnatural-parity processes.

14 data tables
Table 1

Differential cross section as a function of T+ABS(TMIN) in the photon energy range 1.57 to 1.67 GeV.

Table 2

Differential cross section as a function of T+ABS(TMIN) in the photon energy range 1.67 to 1.77 GeV.

Table 3

Differential cross section as a function of T+ABS(TMIN) in the photon energy range 1.77 to 1.87 GeV.

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