HEPData Search

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Phase shift analysis of K+p elastic scattering at 780 MeV/c

Focardi, S. ; Minguzzi-Ranzi, A. ; Monari, L. ; et al.

Phys.Lett.B 24 (1967) 90461 314-317, 1967.

Inspire Record 1389646 DOI 10.17182/hepdata.29618

A phase shift analysis of the K⁺p elastic scattering at 780 MeV/c has been performed. The experimental differential cross section is best explained by a solution with dominant s wave, negative s wave phase shift (−42.7 ± 1 deg.) and small contributions of p and d waves.

1 data table

Table 1

Corrected for PI+ P events and scanning efficiency.

Investigation of energy spectra of Z=1 and 2 particles from deuteron reactions on $^{58}$Ni, $^{64}$Ni nuclei

Kondrat'ev, V.P. ; Krasnov, L.V. ; Litvin, V.F. ; et al.

JINR-1-84-778, 1984.

Inspire Record 1387707 DOI 10.17182/hepdata.1113

The experimental energy, angular and isotopic distributions for hydrogen and helium nuclei produced in 6.7 GeV deuteron interactions with 58Ni and 64Ni isotopes are presented. The data obtained by using the multichannel E-E semiconductor spectrometer in the 3-50 MeV energy range. Energy spectra are very close to Maxwell distribution, angular distributions are isotropic, isotopic ratios do not depend on emission angle of fragments but depend on a projectile mass

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

High-precision Measurements of piP Elastic Differential Cross Sections in the Second Resonance Region

The EPECUR collaboration Alekseev, I.G. ; Andreev, V.A. ; Bordyuzhin, I.G. ; et al.

Phys.Rev.C 91 (2015) 025205, 2015.

Inspire Record 1323450 DOI 10.17182/hepdata.67659

Cross sections for pi+-p elastic scattering have been measured to high precision, for beam momenta between 800 and 1240 MeV/c, by the EPECUR Collaboration, using the ITEP proton synchrotron. The data precision allows comparisons of the existing partial-wave analyses (PWA) on a level not possible previously. These comparisons imply that updated PWA are required.

249 data tables

Table 1

Differential cross section of elastic $\pi^+$p-scattering at P= 800.25 MeV/c. Errors shown are statistical only.

Table 2

Differential cross section of elastic $\pi^+$p-scattering at P= 803.75 MeV/c. Errors shown are statistical only.

Table 3

Differential cross section of elastic $\pi^+$p-scattering at P= 807.25 MeV/c. Errors shown are statistical only.

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Hard photon production and tests of QED at LEP

The L3 collaboration Acciarri, M. ; Achard, P. ; Adriani, O. ; et al.

Phys.Lett.B 475 (2000) 198-205, 2000.

Inspire Record 513397 DOI 10.17182/hepdata.48965

The total and differential cross sections of the process e+e- -> n gamma with n >= 2 are measured using data collected by the L3 experiment at centre-of-mass energies of \sqrt{s}=183 and 189 GeV. The results are in agreement with the Standard Model expectations. Limits are set on deviations from QED, contact interaction cut-off parameters and masses of excited electrons.

2 data tables

Table 1

Measured cross section.

Table 2

Measured differential cross sections corrected for efficiency and additional photons as a function of cos(theta) where theta is the polar angle of the event defined as. cos(theta)=ABS((sin(theta1-theta2)/2)/(sin(theta1+theta2)/2)).

Observation of multiple hard photon final states at s**(1/2) = 130-GeV to 140-GeV at LEP.

The L3 collaboration Acciarri, M. ; Adam, A. ; Adriani, O. ; et al.

Phys.Lett.B 384 (1996) 96006120 323-332, 1996.

Inspire Record 418664 DOI 10.17182/hepdata.47566

We have studied the process e⁺e⁻ → nγ (n ≥ 2) at an average center-of-mass energy of 133 GeV using the L3 detector at LEP. For an integrated luminosity of 4.95 pb⁻¹ we find one γγγγ(γ) final state with only hard photons. The rates of both γγγ and γγ events are consistent with QED expectations. The cross section of the reaction e⁺e⁻ → γγ(γ) in the polar range 16° < θγ < 164° is measured to be 22.6 ± 2.2 pb. Decays into photons of narrow scalar resonances with masses between 90 and 130 GeV are not observed. The observation of the event with four energetic photons is consistent with QED although the kinematic configuration of the photons is atypical.

2 data tables

Table 1

Cross section for process E+ E- --> GAMMA GAMMA (GAMMA) with two hard photons.Error is purely statistical, systematic effects are neglected.

Table 2

No description provided.

Tests of QED at LEP energies using e+ e- --> gamma gamma (gamma) and e+ e- --> lepton+ lepton- gamma gamma

The L3 collaboration Acciarri, M. ; Adam, A. ; Adriani, O. ; et al.

Phys.Lett.B 353 (1995) 136-144, 1995.

Inspire Record 394354 DOI 10.17182/hepdata.47938

Total and differential cross sections for the process e + e − → γγ ( γ ), and the total cross section for the process e + e − → γγγ , are measured at energies around 91 GeV using the data collected with the L3 detector from 1991 to 1993. We set lower limits, at 95% CL, on a contact interaction energy scale parameter Λ > 602 GeV, on the mass of an excited electron m e ∗ >146 GeV and on the QED cut-off parameters Λ + > 149 GeV and Λ _ > 143 GeV. Upper limits are also set o branching fractions of Z decaying into γγ , π ° and ηγ of 5.2 × 10 −5 , 5.2 × 10 −5 and 7.6 × 10 −5 respectively. The reactions e + e − → ℓ + ℓ − nγ (ℓ = e , μ , τ ) are studied using the data collected from 1990 to 1994. The data are consistent with the QED expectations.

3 data tables

Table 1

No description provided.

Table 2

No description provided.

Table 3

No description provided.

A Test of quantum electrodynamics in the reaction e+ e- ---> gamma gamma (gamma)

The L3 collaboration Adriani, O. ; Aguilar-Benitez, M. ; Ahlen, S. ; et al.

Phys.Lett.B 288 (1992) 404-411, 1992.

Inspire Record 336900 DOI 10.17182/hepdata.29221

We have measured the total and differential cross sections of the reaction e + e − → γγ ( γ ) at center-of-mass energies around 91 GeV, with an integrated luminosity of 14.2 pb −1 . The results are in good agreement with QED predictions. We set lower limits, at 95% confidence level, on the QED cutoff parameters of Λ + > 139 GeV, Λ − > 108 GeV and on the mass of an excited electron of m e∗ > 127 GeV . We searched for Z 0 rare decays with photonic signitures in the final state. Upper limits, at 95% confidence level, for branching ratio of Z 0 decaying into π 0 γ / γγ , νγ and γγγ are 1.2 × 10 −4 , 1.8 × 10 −4 , 3.3 × 10 −5 respectively.

3 data tables

Table 1

Measured cross section for the 1991 data.

Table 2

Measured cross section for the 1990 data.

Table 3

Measured differential cross sections of combined 1990 and 1991 data.