HEPData Search

A mass-dependent asymmetry was observed in the decay angular distribution of a photoproduced K + K − system near the K + K − threshold. The corresponding moments 〈 Y 1 0 〉 have been evaluated. Interpreting the asymmetry as an S-P wave interface due to the states S 993 ∗ (0 + ) and ø 1019 (1 − ) one can compute the moments 〈 Y 1 0 〉 through an amplitude analysis. The theoretical calculation reproduces the experimental results well, if one assumes a real S-wave amplitude for the S 993 ∗ . The data cannot be explained by a non-resonant real S-wave. Other possibilities have been discussed. An estimate of the photoproduction cross section of the S ∗ → K + K − can be given on the basis of the above hypothesis.

1 data table

Table 1

No description provided.

Evidence for Spin Effects in $p p$ Elastic Scattering at 150-{GeV}/$c$

Fidecaro, G. ; Fidecaro, M. ; Nurushev, S. ; et al.

Phys.Lett.B 76 (1978) 369-373, 1978.

Inspire Record 130230 DOI 10.17182/hepdata.27444

Proton elastic scattering off a polarized proton target has been measured at 150 GeV/ c , in the |; t |-range 0.2–3.0 GeV 2 . The results on polarization and differential cross section are presented.

2 data tables

Table 1

No description provided.

Table 2

No description provided.

rivet Analysis
Total Cross-section for Hadron Production by $e^+ e^-$ Annihilation at Center-of-mass Energies Between 3.6-{GeV} and 5.2-{GeV}

The DASP collaboration Brandelik, R. ; Braunschweig, W. ; Martyn, H.U. ; et al.

Phys.Lett.B 76 (1978) 361, 1978.

Inspire Record 129715 DOI 10.17182/hepdata.27431

The total cross section for e + e − annihilation into hadronic final states between 3.6 and 5.2 GeV was measured by the nonmagnetic inner detector of DASP, which has similar trigger and detection efficiencies for photons and charged particles. The measured difference in R = σ had / σμμ between 3.6 GeV and 5.2 GeV is ΔR = 2.1 ± 0.3. We observe three peaks at cm energies of 4.04, 4.16 and 4.417 GeV, the parameters of which, when interpreted as resonances, are given.

2 data tables

Table 1

EXCLUDING CONTRIBUTION OF TAU HEAVY LEPTON.

Table 2

INCLUDING CONTRIBUTION OF TAU HEAVY LEPTON.

Backward Production in $\pi^- p \to p_f \pi^+ \pi^- \pi^-$ Reaction at 9-{GeV}/$c$ and 12-{GeV}/$c$

Ferrer, A. ; Bouquet, B. ; D'Almagne, B. ; et al.

Nucl.Phys.B 142 (1978) 77-107, 1978.

Inspire Record 130740 DOI 10.17182/hepdata.34939

We have analyzed backward meson production in the reaction π − p → p f π + π − π − at 9 GeV/ c and 12 GeV/ c incident π − momenta, from an experiment performed at the CERN Ω Spectrometer using a fast proton (p f ) trigger device. We find strong production of quasi-two-body processes N ∗ ϱ and N ∗ f with a production mechanism consistent with u -channel nucleon exchange. At a lower level, we observe N ∗ π processes with a 3-body baryon decay through Δ(1232)π. In the (3π) − system, we find evidence for A 1 − and clear A 2 − backward production with similar cross sections (≈0.5 μb).

3 data tables

Table 1

No description provided.

Table 2

U-HELICITY JACKSON FRAME.

Table 3

U-HELICITY JACKSON FRAME.

A Measurement of the Energy Dependence of Elastic $\pi p$ and $p p$ Scattering at Large Angles

Jenkins, K.A. ; Price, L.E. ; Klem, R. ; et al.

Phys.Rev.Lett. 40 (1978) 425, 1978.

Inspire Record 6233 DOI 10.17182/hepdata.3359

We have measured π±p and pp elastic differential cross sections in the range |cosθc.m.|<0.35 for incident momenta from 2 to 9.7 GeV/c for π−p and pp and from 2 to 6.3 GeV/c for π+p. We find that the fixed-c.m.-angle πp differential cross sections cannot be described as simple functions of s. The data are compared to the energy and angular dependence predicted by the constituent model of Gunion, Brodsky, and Blankenbecler.

56 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

More…

INVARIANT CROSS-SECTIONS FOR THE INCLUSIVE REACTIONS anti-p p ---> pi+ X AND anti-p p ---> p X AT 22.4-GeV/c

The Alma Ata-Dubna-Helsinki-Moscow-Prague collaboration Boos, E.G. ; Ermilova, D.I. ; Samoilov, V.V. ; et al.

Nuovo Cim.A 47 (1978) 377, 1978.

Inspire Record 130221 DOI 10.17182/hepdata.37561

Invariant inclusive cross-sections for π+-mesons and protons from$\bar pp$ reactions at 22.4 GeV/c are presented. The average multiplicity for the production of π+-mesons is 1.92±0.02 and for protons 0.41±0.02. Annihilation spectra have been approximated by using the difference between$\bar pp$ and pp data. The resulting distributions have similar gross features as the total$\bar pp$ data.

1 data table

Table 1

No description provided.

Fluctuations in Large Angle $\pi^\pm p$ Elastic Scattering

Jenkins, K.A. ; Price, L.E. ; Klem, R. ; et al.

Phys.Rev.Lett. 40 (1978) 429, 1978.

Inspire Record 6210 DOI 10.17182/hepdata.76245

Large-angle π±p elastic-scattering cross sections, measured between 2 and 9 GeV/c in fine intervals of incident momentum and scattering angle, are used to search for cross-section fluctuations occurring for small changes in the center-of-mass energy as suggested by Ericson and Mayer-Kuckuck and by Frautschi. Significant fluctuations are observed.

144 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

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COMPARISON OF HIGH TRANSVERSE MOMENTUM PI0 PRODUCTION FROM PI-, K-, P, AND ANTI-P BEAMS.

Donaldson, G. ; Gordon, H. ; Lai, K.W. ; et al.

Phys.Rev.Lett. 40 (1978) 917-920, 1978.

Inspire Record 131684 DOI 10.17182/hepdata.14084

We compare high-transverse-momentum (P⊥) inclusive π0 production from π−, K−, p, and p¯ beams, at 100 and 200 GeV/c, for center-of-mass (c.m.) angles ranging from 2° to 115° and P⊥<4.5 GeV/c. The ratio σ(pp→π0X)σ(πp→π0X) decreases with increasing P⊥, and changes dramatically with c.m. angle. Also, the ratios σ(K−p→π0X)σ(π−p→π0X) and σ(p¯p→π0X)σ(pp→π0X) are approximately constant. These measurements are consistent with a theoretical viewpoint in which constituents of the incident hadrons undergo a hard-scattering subprocess.

65 data tables

Table 1

No description provided.

Table 2

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Table 3

No description provided.

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Meson Resonance Production in p p Interactions at 53-GeV (Center-of-Mass) Energy

Boehm, A. ; VanDalen, Gordon J. ; Kernan, A. ; et al.

Phys.Rev.Lett. 41 (1978) 1761-1764, 1978.

Inspire Record 136909 DOI 10.17182/hepdata.3338

At the CERN intersecting storage ring the inclusive differential cross section [dσdσ]y=1 has been measured for f0, g0, K*0(1420), and K¯*0(1420) production: We obtain 0.58±0.05 mb, 0.09±0.05 mb, 38±15 μb, and 26±13 μb, respectively. The corresponding total inclusive cross sections are estimated to be 2.62±0.26 mb, 0.40±0.22 mb, 154±60 μb, and 107±52 μb, respectively. The magnitude of the K* cross section implies a cross section of approximately 5 μb for production of a charmed DD¯ pair.

2 data tables

Table 1

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Date

Collaboration

Subject_areas

Phrases

Reactions

Observables

CM Energies (GeV)

Authors Reset

Measurement of the Reactions $\bar{P} P \to \bar{\Lambda} \Lambda$, $\bar{p} p \to \bar{\Lambda} \Sigma^0$ and $\bar{P} P \to \bar{\Lambda}$ (Missing Mass) at 6-{GeV}

S - $P$ Wave Interference in $K^+ K^-$ Photoproduction Near $K^+ K^-$ Threshold

Evidence for Spin Effects in $p p$ Elastic Scattering at 150-{GeV}/$c$

rivet Analysis
Total Cross-section for Hadron Production by $e^+ e^-$ Annihilation at Center-of-mass Energies Between 3.6-{GeV} and 5.2-{GeV}

Backward Production in $\pi^- p \to p_f \pi^+ \pi^- \pi^-$ Reaction at 9-{GeV}/$c$ and 12-{GeV}/$c$

A Measurement of the Energy Dependence of Elastic $\pi p$ and $p p$ Scattering at Large Angles

INVARIANT CROSS-SECTIONS FOR THE INCLUSIVE REACTIONS anti-p p ---> pi+ X AND anti-p p ---> p X AT 22.4-GeV/c

Fluctuations in Large Angle $\pi^\pm p$ Elastic Scattering

COMPARISON OF HIGH TRANSVERSE MOMENTUM PI0 PRODUCTION FROM PI-, K-, P, AND ANTI-P BEAMS.

Meson Resonance Production in p p Interactions at 53-GeV (Center-of-Mass) Energy