HEPData Search

The cross section for the production of π+π− or K+K− pairs in γγ interactions is measured for mππ between 1.7 and 3.5 GeV/c2 and for two intervals of γγ center-of-mass scattering angle. Results are compared with predictions of a QCD model.

2 data tables

Table 1

Data read off graph.

Table 2

Data read off graph.

Study of the Reaction $\gamma \gamma \to 2 \pi^+ 2 \pi^- \pi^0$ and Upper Limits on the Production of $\gamma \gamma \to \omega \omega$ and $\gamma \gamma \to \rho^0 \omega$

The PLUTO collaboration Berger, Christoph ; Genzel, H. ; Lackas, W. ; et al.

Z.Phys.C 29 (1985) 183, 1985.

Inspire Record 220911 DOI 10.17182/hepdata.15911

A search for the reactionsγγ→ωω andγγ→ρ0ω has been carried out at an averagee+e− CM energy of 34.6 GeV with an integrated luminosity of 45 pb−1. Upper limits are set for these two channels over the γγ CM Energy range of 1.6 to 2.5 GeV. The cross section is determined for the exclusive channelγγ→π+2π−π0.

3 data tables

Table 1

Data read from graph.

Table 2

Data read from graph.

Table 3

Data read from graph.

Search for Two Photon Production of Resonances Decaying Into $K \bar{K}$ and $K \bar{K} \pi$

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Kirschfink, F.J. ; et al.

Z.Phys.C 29 (1985) 189, 1985.

Inspire Record 220941 DOI 10.17182/hepdata.16018

An analysis of the production ofKS0KS0 andK±Ks0π∓ by two quasi-real photons is presented. The cross section forγγ→K0$\overline {K^0 } $, which is given for the γγ invariant mass range fromK$\bar K$ threshold to 2.5 GeV, is dominated by thef′(1525) resonance and an enhancement near theK$\bar K$ threshold. Upper limits on the product of the two-photon width times the branching ratio intoK$\bar K$ pairs are given forΘ(1700),h(2030), and ξ(2220). For exclusive two-photon production ofK±Ks0π∓ no significant signal was observed. Upper limits are given on the cross section ofγγ→K+$\overline {K^0 } $π− orK−K0π+ between 1.4 and 3.2 GeV and on the product of the γγ width times the branching ratio into theK$\bar K$π final states for theηc(2980) and the ι(1440), yieldingΓ(γγ)→i(1440))·BR(i(1440)→K$\bar K$π<2.2 keV at 95% C.L.

2 data tables

Table 1

Data read from graph.. Corrected for the angular distribution, which is assumed to be sin(theta)**4 for W > 1.14 GeV and isotropic in the first bin.

Table 2

Data read from graph.

Studies of $\bar{p} p \to \bar{n} n$ and $\bar{n} p$ Annihilation at Incident Momenta of 700-{MeV}/$c$ and 760-{MeV}/$c$

The Bombay-Chandigarh-Jammu-Tokyo collaboration Banerjee, S. ; Ganguli, S.N. ; Gurtu, A. ; et al.

Z.Phys.C 28 (1985) 163, 1985.

Inspire Record 217418 DOI 10.17182/hepdata.1974

Results are presented on the charge exchange reaction$\bar pp \to \bar nn$ and$\bar np$ annihilations from bubble chamber exposures to antiproton beam of momenta 700 and 760 MeV/c. The differential cross section of$\bar pp \to \bar nn$ shows a forward spike followed by a clear dip bump structure. Total annihilation cross section of$\bar np$ for average$\bar n$ momentum of 700 MeV/c has been evaluated to be 55.4±2.2 mb. The multiplicity, Feynmanx andpT2 distributions for inclusive charged pions in$\bar pp$ and$\bar np$ annihilations are found to be similar. The emission of charged pions from$\bar np$ annihilations are found to be consistent with thermodynamic models with temperature ∼110 MeV.

11 data tables

Table 1

No description provided.

Table 2

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Table 3

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Measurement of the spin correlation parameter A00kk for pp elastic scattering in the energy range 0.72–1.1 GeV

Bystricky, J. ; Chaumette, P. ; Deregel, J. ; et al.

Nucl.Phys.B 258 (1985) 90623 483-504, 1985.

Inspire Record 221352 DOI 10.17182/hepdata.33761

The spin correlation parameter A00kk (pp) has been measured in the angular region 45°<θCM<90° at 0.719, 0.834, 0.874, 0.934, 0.995 and 1.095 GeV using the SATURNE II polarized proton beam incident on a polarized target. The parameters A00nn(pp and A00sk(pp) were measured at 0.874 in the same angular region.

8 data tables

Table 1

No description provided.

Table 2

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Table 3

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PROTON COMPTON SCATTERING AT BACKWARD ANGLES IN THE ENERGY RANGE FROM 400-MeV TO 1050-MEV

Wada, Y. ; Egawa, K. ; Imanishi, A. ; et al.

Nucl.Phys.B 247 (1984) 313-338, 1984.

Inspire Record 215373 DOI 10.17182/hepdata.33842

Differential cross sections of proton Compton scattering have been measured in the energy range between 400 MeV and 1050 MeV at C.M.S. angles of 150° and 160°.

3 data tables

Table 1

No description provided.

Table 2

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Table 3

No description provided.

DIFFERENTIAL CROSS-SECTIONS FOR PROTON COMPTON SCATTERING AT INCIDENT PHOTON ENERGIES BETWEEN 900-MeV AND 1150-MEV

Ishii, T. ; Egawa, K. ; Imanishi, A. ; et al.

Nucl.Phys.B 254 (1985) 458-474, 1985.

Inspire Record 218918 DOI 10.17182/hepdata.33788

Differential cross sections of proton Compton scattering have been measured in the angular range between 50° and 130° at incident photon energies from 900 MeV to 1150 MeV. A sharp dip in the angular distribution found by a Bonn group at 110° in the photon energy region around 900 MeV is not observed in the present measurement. A new dip-bump structure is found at photon energies above 1050 MeV, which is similar to that for pion-nucleon scattering.

12 data tables

Table 1

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Table 2

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Table 3

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Search for narrow structure in proton‐antiproton annihilation cross sections from 1900 to 1960 MeV

Lowenstein, D.I. ; Pealsee, D.C. ; Miller, R.J. ; et al.

Phys.Lett.B 158 (1985) 505-510, 1985.

Inspire Record 221435 DOI 10.17182/hepdata.30389

The p̄p annihilation cross section has been measured with good resolution (∼2 MeV rms) in the mass range 1900–1960 MeV. No narrow structures are seen, the 90% confidence level upper limit being 8–12 mb‐MeV for the integrated area of a resonance in this mass range. However, we do not rule out a very narrow bump‐dip structure seen in an earlier experiment in the 1935–1941 MeV mass interval. The data also do not support the existence of a broad structure previously reported at 1937 MeV.

1 data table

Table 1

Fit of form A + B/D gives A = 8.5 +- 2.5mb and B = 40.7 +- 1.3mb in the mass range 1900 to 1960 MeV.

NEUTRAL PION PHOTOPRODUCTION ON THE DEUTERON

Imanishi, A. ; Ishii, T. ; Kato, S. ; et al.

Phys.Rev.Lett. 54 (1985) 2497-2500, 1985.

Inspire Record 220232 DOI 10.17182/hepdata.20385

Large-angle cross sections for γd→π0d are systematically measured in the photon energy range between 500 and 1000 MeV. A good fit is obtained by use of a Glauber-model calculation which includes the dibaryon resonances F33(2.26) and G41(2.51), but the fit has an unusual nature in the role of resonance and nonresonance contributions.

2 data tables

Table 1

Liquid hydrogen target for final calibration.

Table 2

LIQUID DEUTERIUM TARGET.

Date

Collaboration

Subject_areas

Phrases

Reactions

Observables

CM Energies (GeV) Reset

Authors Reset

A STUDY OF ANTI-N P ANNIHILATIONS BETWEEN 0.5-GEV/C AND 0.8-GEV/C

rivet Analysis
Charged Meson Pair Production in $\gamma \gamma$ Interactions

Study of the Reaction $\gamma \gamma \to 2 \pi^+ 2 \pi^- \pi^0$ and Upper Limits on the Production of $\gamma \gamma \to \omega \omega$ and $\gamma \gamma \to \rho^0 \omega$

Search for Two Photon Production of Resonances Decaying Into $K \bar{K}$ and $K \bar{K} \pi$

Studies of $\bar{p} p \to \bar{n} n$ and $\bar{n} p$ Annihilation at Incident Momenta of 700-{MeV}/$c$ and 760-{MeV}/$c$

Measurement of the spin correlation parameter A00kk for pp elastic scattering in the energy range 0.72–1.1 GeV

PROTON COMPTON SCATTERING AT BACKWARD ANGLES IN THE ENERGY RANGE FROM 400-MeV TO 1050-MEV

DIFFERENTIAL CROSS-SECTIONS FOR PROTON COMPTON SCATTERING AT INCIDENT PHOTON ENERGIES BETWEEN 900-MeV AND 1150-MEV

Search for narrow structure in proton‐antiproton annihilation cross sections from 1900 to 1960 MeV

NEUTRAL PION PHOTOPRODUCTION ON THE DEUTERON