Date

Inclusive Production of Nonstrange Mesons in anti-p p Annihilations

The Bombay-CERN-College de France-Madrid collaboration Hamatsu, R. ; Ganguli, S.N. ; Malhotra, P.K. ; et al.
Nucl.Phys.B 123 (1977) 189, 1977.
Inspire Record 111926 DOI 10.17182/hepdata.35452

A study of the inclusive production of π − , η , ϱ 0 , ω ad f mesons in p p annihilation at 0.7 GeV/ c is presented. Topological and channel cross sections are determined. Longitudinal and transversal momentum distributions of non-strange mesons are studied. It is deduced that nearly 48% of all negative pions arise from the decay of η , ϱ 0 , ω and f mesons.

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Study of the D (1285) and E(1420) Resonances Produced in anti-p p Annihilations at 700-MeV/c to 760-MeV/c

Nacasch, R. ; Defoix, C. ; Dobrzynski, L. ; et al.
Nucl.Phys.B 135 (1978) 203-223, 1978.
Inspire Record 122850 DOI 10.17182/hepdata.41975

In this paper we have investigated the properties of the D(1285) and E(1420) meson resonances using the five-body annihilation channels p p → K K πππ obtained in a large statistics experiment (28 events/μb). The analysis favours the 1 + spin-parity assignment for the D(1285) meson. The dominant decay mode of the D(1285) into K K π is found to be δ(970)π. The situation concerning the E(1420) meson remains confused although not inconsistent with previous analyses. Partial cross sections on resonance production are also presented.

1 data table match query

No description provided.


First antineutrino energy spectrum from $^{235}$U fissions with the STEREO detector at ILL

The STEREO collaboration Almazán, H. ; Bernard, L. ; Blanchet, A. ; et al.
J.Phys.G 48 (2021) 075107, 2021.
Inspire Record 1821378 DOI 10.17182/hepdata.99805

This article reports the measurement of the $^{235}$U-induced antineutrino spectrum shape by the STEREO experiment. 43'000 antineutrinos have been detected at about 10 m from the highly enriched core of the ILL reactor during 118 full days equivalent at nominal power. The measured inverse beta decay spectrum is unfolded to provide a pure $^{235}$U spectrum in antineutrino energy. A careful study of the unfolding procedure, including a cross-validation by an independent framework, has shown that no major biases are introduced by the method. A significant local distortion is found with respect to predictions around $E_\nu \simeq 5.3$ MeV. A gaussian fit of this local excess leads to an amplitude of $A = 12.1 \pm 3.4\%$ (3.5$\sigma$).

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STEREO Detector Response Matrix, sampled using STEREO's simulation using neutrinos with energy distributed according to HFR's IBD yield prediction. The matrix is given as a 200x22 matrix, with 200 50keV-wide $E_\nu$ bins (centers ranging from 0.05 to 10 MeV) and 22 250keV-wide measured-energy bins corresponding to measured data. The matrix is not normalized; desired normalization (e.g., $\sum_j R_{ij} = e_i$ where $e_i$ is the efficiency) has to be applied before the matrix can be used.

Data from Figure 6 – Selection efficiency as a function of $E_\nu$.

Spectrum prediction for ILL's High Flux Reactor, given in 50keV-wide $E_\nu$ bins (centers ranging from 1.8 to 10 MeV). Huber's $^{235}$U prediction in [2 MeV, 8 MeV] is taken from Phys. Rev. C 84 024617 (2011); exponential extrapolations are performed as described in Phys. Rev. Lett. 125 201801 (2020). Relative corrections from Off-equilibrium and Activation are included to obtain the total HFR's spectrum. The IBD cross section we used is based on Strumia-Vissani Phys. Lett. B, 564 42–54 (2003). The IBD yield is simply HFR's spectrum $\times$ IBD cross section. More details can be found in Section 5, where all notations are also introduced.


Version 3
Improved Sterile Neutrino Constraints from the STEREO Experiment with 179 Days of Reactor-On Data

The STEREO collaboration Almazán, H. ; Bernard, L. ; Blanchet, A. ; et al.
Phys.Rev.D 102 (2020) 052002, 2020.
Inspire Record 1770821 DOI 10.17182/hepdata.92323

The STEREO experiment is a very short baseline reactor antineutrino experiment. It is designed to test the hypothesis of light sterile neutrinos being the cause of a deficit of the observed antineutrino interaction rate at short baselines with respect to the predicted rate, known as the reactor antineutrino anomaly. The STEREO experiment measures the antineutrino energy spectrum in six identical detector cells covering baselines between 9 and 11 m from the compact core of the ILL research reactor. In this article, results from 179 days of reactor turned on and 235 days of reactor turned off are reported at a high degree of detail. The current results include improvements in the modelling of detector optical properties and the gamma-cascade after neutron captures by gadolinium, the treatment of backgrounds, and the statistical method of the oscillation analysis. Using a direct comparison between antineutrino spectra of all cells, largely independent of any flux prediction, we find the data compatible with the null oscillation hypothesis. The best-fit point of the reactor antineutrino anomaly is rejected at more than 99.9% C.L.

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Data from Figures 33 and 34 – STEREO exclusion and exclusion sensitivity contours at 95% C.L. for 179 days reactor-on (phase-I+II) using the two-dimensional method. A graphical presentation can be downloaded at "Resources" for reference.

Data from Figures 33 and 34 – STEREO exclusion and exclusion sensitivity contours at 95% C.L. for 179 days reactor-on (phase-I+II) using the two-dimensional method. A graphical presentation can be downloaded at "Resources" for reference.

Data from Figure 32 – STEREO exclusion and exclusion sensitivity contours at 90% C.L. for 179 days reactor-on (phase-I+II). A full graphical presentation can be downloaded at "Resources" for reference.

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The pi+ p interaction at 1.2 gev/c

Berthon, A. ; Mas, J. ; Narjoux, J.L. ; et al.
Nucl.Phys.B 81 (1974) 431-444, 1974.
Inspire Record 93412 DOI 10.17182/hepdata.7945

Experimental results are presented for the available channels in the 1.2 GeV/ c π + p interaction. An isobaric model with incoherent addition of the amplitudes is used to determine the π, Δ and N ∗ abundance rates in the π + π o p final state. The multipole parameters in the density matrix of the Δ ++ are determined as functions of its production angle.

7 data tables match query

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LEGENDRE POLYNOMIAL FIT USED TO CORRECT FOR ELASTIC EVENTS LOST FROM THE FORWARD BIN.

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A Study of K- n Interactions in the Center-Of-Mass Energy Range from 1.60-GeV to 1.75-GeV

Hepp, V. ; Braun, O. ; Grimm, H.J. ; et al.
Nucl.Phys.B 115 (1976) 82-113, 1976.
Inspire Record 113914 DOI 10.17182/hepdata.8493

We present results of a K − d experiment performed with the 81 cm Saclay deuterium bubble chamber which was exposed to a K − beam at 4 momenta between 680 and 840 MeV/ c at the CERN PS. Cross sections were measured for inelastic two- and three-body K − n reactions on the basis of 5200 events/mb. Resonance production in the three-body reactions is discussed. In addition, differential cross sections and polarisations are presented for inelastic two-body reactions.

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CROSS SECTIONS FOR TWO-BODY REACTIONS.

CROSS SECTIONS FOR THREE-BODY REACTIONS.

CROSS SECTIONS FOR K- P REACTIONS.

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NEAR 90-degrees SCATTERING IN THE CHANNELS anti-K0 p ---> pi+ LAMBDA0, anti-K0 p ---> pi+ SIGMA0 AND K0(L) p ---> K0(S) p FROM 1.0-GeV/c TO 7.5-GeV/c

Brandenburg, G.W. ; Johnson, William B. ; Leith, David W.G.S. ; et al.
Phys.Lett.B 44 (1973) 305-309, 1973.
Inspire Record 81024 DOI 10.17182/hepdata.28108

Differential cross sections for center of mass scattering angles near 90° are presented for the reactions K ̄ ° p → π + Λ° , K ̄ ° p → π + Σ° and K L °p → K S °p in the momentum interval 1.0 to 7.5 GeV / c . The energy dependences of these cross sections are found to be equally well described by the parameterization: ( d σ d Ω ) 90° ∞ s −2 or ( d σ d Ω ) 90° ∞ exp (− bp ⊥ ) .

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K*0 (890) POLARIZATION MEASUREMENTS IN THE HYPERCHARGE EXCHANGE REACTION PI- P ---> K*0 (890) LAMBDA0 / SIGMA0 AT 10-GEV/C

The BARI-BONN-CERN-DARESBURY-GLASGOW-LIVERPOOL-MILAN-VIENNA collaboration Evangelista, C. ; Ghidini, B. ; Palano, A. ; et al.
Nucl.Phys.B 165 (1980) 383-394, 1980.
Inspire Record 157497 DOI 10.17182/hepdata.34585

K ∗0 (890) production in the hyperchange exchange reaction π − p → K ∗0 (890) Λ 0 Σ 0 at 10 GeV/ c (28 448 events) is discussed. An amplitude analysis in the t ′ range up to 1 GeV 2 shows that the production mechanism is dominated by natural parity exchange (∼84%). Comparisons are made with predictions from a Regge model and a quark model.

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DENSITY MATRIX ELEMENTS IN THE GOTTFRIED-JACKSON SYSTEM ALLOWING FOR COHERENT S-WAVE BACKGROUND TO P-WAVE BREIT-WIGNER K*(892)0 RESONANCE.

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New Data on the Reaction K- n --> (Sigma pi)- and a Partial Wave Analysis of anti-K n --> Sigma pi in the Energy Range 1520-MeV-1745-MeV

Hepp, V. ; Braun, O. ; Grimm, H.J. ; et al.
Phys.Lett.B 65 (1976) 487-491, 1976.
Inspire Record 109742 DOI 10.17182/hepdata.27591

Differential cross sections for K − n → Σ o π o have been measured at K − momenta between 680 and 840 MeV/ c in a bubble chamber experiment. For K − n → Σ o π − the Σ o polarization was also determined. The measurements were combined with the available data on K − p → Σπ in an energy-dependent partial wave analysis in the center of mass energy range from 1520 to 1745 MeV. An acceptable fit was obtained with the well established resonances.

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FULL DETAILS OF THIS EXPERIMENT ARE IN V. HEPP ET AL., NP B115, 82 (1976), THE RECORD OF WHICH CONTAINS THE TABULATED TOTAL AND DIFFERENTIAL CROSS SECTIONS, POLARIZATIONS AND LEGENDRE POLYNOMIAL COEFFICIENTS.


PI+ PHOTOPRODUCTION AT CONSTANT PION ENERGY, AND THE (GAMMA PI RHO) COUPLING

Leith, David W.G.S. ; Little, R. ; Lawson, E.M. ;
Phys.Lett. 8 (1964) 355-357, 1964.
Inspire Record 8509 DOI 10.17182/hepdata.27375

None

1 data table match query

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