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SEARCH FOR EXCLUSIVE J / psi PRODUCTION

Chiang, I.H. ; Johnson, R.A. ; Kwan, B.P. ; et al.
Phys.Rev.D 34 (1986) 1619, 1986.
Inspire Record 228262 DOI 10.17182/hepdata.23503

We have searched for exclusive hadronic J/ψ production by looking for narrow resonances in the e+e− mass spectrum of the reaction π−p→e+e−n. No events were observed in the region around 3.1 GeV/c2. The cross section for the reaction π−p→J/ψ n at 13 GeV/c is no more than 103 pb at the 90% confidence level.

1 data table
Table 1

Corrected cross section based on 7.4 pct branching ratio.


rivet Analysis
Measurement of the Radiative Width of the A(2) (1320) in Two Photon Interactions

The TASSO collaboration Althoff, M. ; Braunschweig, W. ; Gerhards, R. ; et al.
Z.Phys.C 31 (1986) 537, 1986.
Inspire Record 228876 DOI 10.17182/hepdata.15859

The reactione+e−→e+e− A2 (1320) has been observed by detecting the decayA2→π+,π-π0. The two-photon width of theA2 has been measured to be Г(A2→γγ)=(0.09±0.27 (stat)±0.16 (syst)) keV. The cross section σ(γγ→π+,π-π0 has been determined outside theA2 resonance region.

1 data table
Table 1

Data read off a graph.


Neutral Strange Particle Exclusive Production in Charged Current High-energy Anti-neutrino Interactions

Ammosov, V.V. ; Gapienko, V.A. ; Gapienko, G.S. ; et al.
Z.Phys.C 36 (1987) 377-381, 1987.
Inspire Record 230983 DOI 10.17182/hepdata.15702

The cross section of the quasi-elastic reactions\(\bar v_\mup \to \mu ^ +\Lambda (\Sigma ^0 )\) in the energy range 5–100 GeV is determined from Fermilab 15′ bubble chamber antineutrino data. TheQ2 analysis of quasi-elastic Λ events yieldsMA=1.0±0.3 GeV/c2 for the axial mass value. With zero µΛK0 events observed, the 90% confidence level upper limit\(\sigma (\bar v_\mup \to \mu ^ +\Lambda {\rm K}^0 )< 2.0 \cdot 10^{ - 40} cm^2 \) is obtained. At the same time, we found that the cross section of reaction\(\bar v_\mup \to \mu ^ +\Lambda {\rm K}^0+ m\pi ^0 \) is equal to\(\left( {3.9\begin{array}{*{20}c}{ + 1.6}\\{ - 1.3}\\ \end{array} } \right) \cdot 10^{ - 40} cm^2 \).

2 data tables
Table 1

No description provided.

Table 2

No description provided.


rivet Analysis
Exclusive Production of Proton Anti-proton Pairs in Photon-photon Collisions

The JADE collaboration Bartel, W. ; Becker, L. ; Cords, D. ; et al.
Phys.Lett.B 174 (1986) 350-356, 1986.
Inspire Record 231554 DOI 10.17182/hepdata.30246

Total and differential cross sections for exclusive production of proton-antiproton pairs in photon-photon collisions have been measured using the JADE detector at PETRA. The total cross section in the CM angular |cos θ ∗ | < 0.6 reaches a maximum value of 3.8 nb for a γγ invariant mass of W γγ = 2.25 GeV, and decreases rapidly for higher values of W γγ . In the range 2.0 GeV < W γγ < 2.6 GeV the angular distribution is not isotopic. The nucleons are preferentially emitted at large angles to the collision axis.

2 data tables
Table 1

Data read off graph.

Table 2

Data read off graph.


Measurement of the Total Cross-section Difference $\Delta \sigma^-$t ($p p$) in the Energy Range From 0.43-{GeV} to 2.4-{GeV}

Perrot, F. ; Azaiez, H. ; Ball, J. ; et al.
Nucl.Phys.B 278 (1986) 881-904, 1986.
Inspire Record 228310 DOI 10.17182/hepdata.33569

The SATURNE II polarized proton beam and the Saclay frozen spin polarized proton target were used to measure the total cross section difference Δσ T = −2 σ 1 tot at 26 energies between 0.43 and 2.4 GeV. Here Δσ T is the total cross section difference for transverse beam and target spins parallel and antiparallel, respectively, and σ 1tot is one of spin-dependent terms in the total cross section σ tot . The energy dependence of Δσ T below 1 GeV shows similar structures as for Δσ L . An additional minimum appears at about 1.3 GeV, which involves a structure in singlet spin partial waves.

1 data table
Table 1

Errors contain both statistics and systematics.


Measurement of Elastic electron Scattering from the Proton at High Momentum Transfer

Arnold, R.G. ; Bosted, Peter E. ; Chang, C.C. ; et al.
Phys.Rev.Lett. 57 (1986) 174, 1986.
Inspire Record 228320 DOI 10.17182/hepdata.3133

We have performed absolute measurements of the differential cross section for elastic e−p scattering in the range of momentum transfer from Q2=2.9 to 31.3 (GeV/c)2. Combined statistical and systematic uncertainties in the cross-section measurements ranged from 3% at low Q2 to 19% at high Q2. These data have been used to extract the proton magnetic form factor GMp(Q2). The results show a smooth decrease of Q4GMp with momentum transfer above Q2=10 (GeV/c)2. These results are compared with recent predictions of perturbative QCD.

14 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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INCLUSIVE rho0 AND K*0 PRODUCTION IN muon-neutrino N CHARGED CURRENT INTERACTIONS

Ammosov, V.V. ; Burtovoy, V.S. ; Gapienko, V.A. ; et al.
Sov.J.Nucl.Phys. 45 (1987) 457, 1987.
Inspire Record 233250 DOI 10.17182/hepdata.10290

None

8 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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STUDY OF QUASI TWO-BODY CHANNELS OF THE REACTION K+ p ---> K0 p pi+ AT 32-GeV/c

Chliapnikov, P.V. ; Shoshiashvili, Sh.S. ; Gerdyukov, L.N. ; et al.
Sov.J.Nucl.Phys. 45 (1987) 836, 1987.
Inspire Record 233156 DOI 10.17182/hepdata.10669

None

3 data tables
Table 1

Axis error includes +- 0.0/0.0 contribution (?////NO DECLAIRED SE.DECAY-BR(BRN=K*(892)+ --> K0 PI+,C=PDG 84)//DECAY-BR(BRN=K2*(1430) --> KAON PION,C=PDG 84)//RES-DEF(RES=K*(892)+,BACK=CORRECTED,DEF=0.72 < M(K0 PI+) < 1.20 GEV,C=M AND W FROM PDG 84)//RES-DEF(RES=K2*(1430)+,BACK=CORRECTED,DEF=1.30 < M(K0 PI+) < 1.68 GEV,C=M AND W FROM PDG 84)//RES-DEF(RES=DEL++,BACK=CORRECTED,DEF= M(P PI+) < 1.6 GEV,C=M AND W FROM PDG 84)).

Table 2

Axis error includes +- 0.0/0.0 contribution (?////NO DECLAIRED SE.DECAY-BR(BRN=K*(892)+ --> K0 PI+,C=PDG 84)//DECAY-BR(BRN=K2*(1430) --> KAON PION,C=PDG 84)//RES-DEF(RES=K*(892)+,BACK=CORRECTED,DEF=0.72 < M(K0 PI+) < 1.20 GEV,C=M AND W FROM PDG 84)//RES-DEF(RES=K2*(1430)+,BACK=CORRECTED,DEF=1.30 < M(K0 PI+) < 1.68 GEV,C=M AND W FROM PDG 84)//RES-DEF(RES=DEL++,BACK=CORRECTED,DEF= M(P PI+) < 1.6 GEV,C=M AND W FROM PDG 84)).

Table 3

No description provided.


Cross-sections of $N P$ Interaction Channels at $P (N$) = 1-{GeV}/c. - 5-{GeV}/c. (In Russian)

Besliu, C. ; Gruia, S. ; Ierusalimov, A.P. ; et al.
Sov.J.Nucl.Phys. 43 (1986) 565-568, 1986.
Inspire Record 238221 DOI 10.17182/hepdata.17455

None

5 data tables
Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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Energy Dependence of Spin Effects in $p$ (Polarized) $p$ (Polarized) $\to p p$

Court, G.R. ; Crabb, D.G. ; Gialas, I. ; et al.
Phys.Rev.Lett. 57 (1986) 507, 1986.
Inspire Record 229812 DOI 10.17182/hepdata.20190

We measured the analyzing power A and the spin-spin correlation parameter Ann, in large-P⊥2 proton-proton elastic scattering, using a polarized-proton target and the polarized-proton beam at the Brookhaven Alternating-Gradient Synchrotron. We also used our polarimeter to measure A at small P⊥2 at 13 GeV with good precision and found some deviation from the expected 1Plab behavior. At 18.5 GeV/c we found Ann=(−2±16)% at P⊥2=4.7 (GeV/c)2. Comparison with lower-energy data from the Argonne Zero-Gradient Synchrotron shows a sharp and surprising energy dependence for Ann at large P⊥2.

3 data tables
Table 1

POL is error weighted average of polarized beam and target measurements.

Table 2

POL is error-weighted average of polarized beam and target measurements.

Table 3

POL is error-weighted average of polarized beam and target measurement.